Kenwood Stereo System TH K2AT User Manual
INSTRUCTION MANUAL  
1T44HMHz-FKM T2RAANSTCEIVER  
TH-K2E  
TH-K2ET  
4T30HMHz-FKM T4RAANSTCEIVER  
TH-K4E  
© B62-1696-00 (K, K2, E, E3, M, M2)  
09 08 07 06 05 04 03 02 01 00  
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MODELS COVERED BY THIS MANUAL  
The models listed below are covered by this manual.  
TH-K2AT, TH-K2E, TH-K2ET  
TH-K4AT, TH-K4E  
MARKET CODES  
Kn: The Americas  
En: Europe  
Mn: General  
(Where n represents a variation number.)  
The market code is printed on the bar-code label of the  
carton box.  
Refer to the product specifications {pages 122 ~ 133}  
for information on the available operating frequencies  
within each model. For accessories supplied with each  
model, refer to pages vii ~ ix.  
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PRECAUTIONS  
Please observe the following precautions to prevent fire,  
personal injury, or transceiver damage:  
•
•
•
Do not transmit with high output power for extended  
periods. The transceiver may overheat.  
Do not modify this transceiver unless instructed by  
this manual or by KENWOOD documentation.  
When using a regulated power supply, connect the  
specified DC cable (option) to the DC IN jack on the  
transceiver. The supply voltage must be between  
12 V and 16 V to prevent damaging the transceiver.  
•
•
When connecting the transceiver to a cigarette  
lighter socket in a vehicle, use the specified cigarette  
lighter cable (option).  
Do not expose the transceiver to long periods of  
direct sunlight nor place it close to heating  
appliances.  
•
•
Do not place the transceiver in excessively dusty,  
humid, or wet areas, nor on unstable surfaces.  
If an abnormal odor or smoke is detected coming  
from the transceiver, turn OFF the power  
immediately and remove the battery case or the  
battery pack from the transceiver. Contact your  
authorized KENWOOD dealer, customer service, or  
service station.  
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CONTENTS  
NOTICE TO THE USER  
MODELS COVERED BY THIS MANUAL  
MARKET CODES  
PRECAUTIONS  
CONTENTS ................................................................... i  
THANK YOU .................................................................... vi  
FEATURES ...................................................................... vi  
SUPPLIED ACCESSORIES ....................................................... vii  
WRITING CONVENTIONS FOLLOWED ............................................. x  
PREPARATION ............................................................. 1  
INSTALLING THE PB-43N NI-MH BATTERY PACK ......................... 1  
INSTALLING ALKALINE BATTERIES .......................................... 2  
INSTALLING THE ANTENNA ................................................. 4  
ATTACHING THE HAND STRAP (OTHER THAN TH-K2AT K/ K2) ............ 4  
INSTALLING THE BELT CLIP ................................................ 5  
CHARGING THE PB-43N NI-MH BATTERY PACK  
(OTHER THAN TH-K2AT K2/ M2, TH-K4AT M2) ...................... 6  
CONNECTING TO A CIGARETTE LIGHTER SOCKET ............................ 8  
CONNECTING TO A REGULATED POWER SUPPLY ............................. 9  
YOUR FIRST QSO ........................................................ 10  
FIRST QSO ............................................................. 10  
GETTING ACQUAINTED .................................................. 12  
KEYS AND CONTROLS .................................................... 12  
DISPLAY ................................................................. 14  
BASIC OPERATION ........................................................ 17  
Switching the Power ON/OFF ................................ 17  
Adjusting the Volume ......................................... 17  
Adjusting the Squelch ......................................... 18  
Transmitting..................................................... 19  
Selecting an Output Power .............................. 19  
Selecting a Frequency ........................................ 20  
VFO Mode .................................................. 20  
MHz Mode .................................................. 20  
Direct Frequency Entry  
(TH-K2AT/ET/K4AT only) ................................. 21  
i
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MENU SETUP ............................................................. 24  
WHAT IS A MENU? ...................................................... 24  
MENU ACCESS ........................................................... 24  
MENU FUNCTION LIST ................................................... 26  
ALPHABETICAL FUNCTION LIST ............................................ 29  
OPERATING THROUGH REPEATERS................................... 31  
OFFSET PROGRAMMING FLOW ............................................ 32  
Programming an Offset ....................................... 32  
Selecting an Offset Direction ........................... 32  
Selecting an Offset Frequency .......................... 33  
Activating the Tone Function ............................ 34  
Selecting a Tone Frequency ............................. 35  
AUTOMATIC REPEATER OFFSET (TH-K2AT/ E/ ET ONLY)................. 37  
REVERSE FUNCTION ...................................................... 38  
AUTOMATIC SIMPLEX CHECK (ASC) ...................................... 38  
TONE FREQ. ID SCAN ................................................... 39  
MEMORY CHANNELS .................................................... 41  
NUMBER OF MEMORY CHANNELS ......................................... 41  
SIMPLEX & REPEATER OR ODD-SPLIT MEMORY CHANNEL? ............... 42  
Storing Simplex Frequencies or  
Standard Repeater Frequencies ............................. 44  
Storing Odd-Split Repeater Frequencies .................. 45  
Recalling a Memory Channel ................................ 46  
Using the Tuning Control ................................ 46  
Using a Numeric Keypad  
(TH-K2AT/ ET/ K4AT only) ................................ 46  
CLEARING A MEMORY CHANNEL .......................................... 47  
NAMING A MEMORY CHANNEL ............................................ 48  
MEMORY CHANNEL TRANSFER ............................................ 50  
Memory a VFO Transfer ..................................... 50  
Channel a Channel Transfer ................................ 50  
CALL CHANNEL .......................................................... 53  
Recalling the Call Channel ................................... 53  
Reprogramming the Call Channel........................... 54  
WEATHER ALERT (TH-K2AT K/ K2 ONLY) .............................. 55  
Programming the Weather Radio Frequency ............. 55  
ii  
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Enabling a Weather Alert ..................................... 56  
CHANNEL DISPLAY ....................................................... 57  
SCAN ....................................................................... 59  
NORMAL SCAN ........................................................... 60  
Band Scan ....................................................... 60  
Program Scan................................................... 61  
Storing a Program Scan Frequency Range ........... 61  
Performing Program Scan ............................... 62  
MEMORY SCAN .......................................................... 63  
All-Channel Scan............................................... 63  
CALL SCAN .............................................................. 64  
PRIORITY SCAN .......................................................... 65  
Programming Priority Channels ............................. 65  
Using Priority Scan ............................................ 65  
MEMORY CHANNEL LOCKOUT ............................................. 67  
SCAN RESUME METHOD .................................................. 68  
SELECTIVE CALL ......................................................... 69  
CTCSS AND DCS ...................................................... 69  
CTCSS ................................................................. 69  
Using CTCSS .................................................... 69  
Selecting a CTCSS Frequency ............................... 70  
CTCSS Freq. ID Scan .......................................... 72  
DCS .................................................................... 73  
Using DCS ....................................................... 73  
Selecting a DCS Code ......................................... 74  
DCS Code ID Scan ............................................. 75  
DTMF FUNCTIONS ....................................................... 76  
MANUAL DIALING (TH-K2AT/ ET/ K4AT ONLY) ........................ 76  
DTMF TX Hold (TH-K2AT/ ET/ K4AT only) .................. 77  
AUTOMATIC DIALER ...................................................... 77  
Storing a DTMF Number in Memory ........................ 77  
Transmitting a Stored DTMF Number....................... 79  
Adjusting the DTMF Tone Transmission Speed ........... 80  
Adjusting the Pause Duration ................................ 80  
DTMF KEY LOCK ....................................................... 81  
iii  
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OPERATOR CONVENIENCES ............................................ 82  
APO (AUTO POWER OFF) .............................................. 82  
BATTERY LIFE ............................................................ 83  
REMAINING BATTERY CAPACITY ........................................... 83  
BATTERY SAVER ......................................................... 84  
BEAT SHIFT .............................................................. 85  
BEEP FUNCTION .......................................................... 85  
BUSY CHANNEL LOCKOUT ................................................ 86  
FREQUENCY STEP SIZE ................................................... 86  
LAMP .................................................................... 88  
LOCK FUNCTION ......................................................... 88  
Tuning Control Unlock ......................................... 89  
MICROPHONE PF KEYS (OPTIONAL) ...................................... 89  
MONITOR ................................................................ 91  
NARROW BAND FM OPERATION .......................................... 91  
POWER-ON MESSAGE ................................................... 92  
PROGRAMMABLE VFO ................................................... 93  
TIME-OUT TIMER ........................................................ 94  
TX INHIBIT .............................................................. 95  
TX POWER .............................................................. 95  
VOX (VOICE-OPERATED TRANSMISSION) ................................. 96  
VOX Gain ........................................................ 97  
VOX Delay Time ................................................ 99  
VOX on Busy .................................................. 100  
OPTIONAL ACCESSORIES ............................................. 101  
INTERFACING TO PERIPHERALS .................................... 104  
SP/MIC JACK ........................................................ 104  
SP/MIC ......................................................... 104  
PC ............................................................... 105  
Using the PG-4Y PC Interface Cable ................. 106  
Using the MCP-1A Software ........................... 107  
TROUBLESHOOTING ................................................... 108  
GENERAL INFORMATION ................................................. 108  
Service ......................................................... 108  
Service Note .................................................. 109  
Cleaning ....................................................... 110  
BACKUP BATTERY ...................................................... 110  
iv  
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MICROPROCESSOR RESET .............................................. 111  
Initial Settings ................................................ 111  
Full Reset ..................................................... 111  
VFO Reset ..................................................... 111  
Performing Reset ............................................ 112  
Full reset ................................................. 112  
VFO reset ................................................. 113  
Reset using the Menu ....................................... 114  
OPERATION NOTICES ................................................... 115  
Operating Voltage ............................................ 115  
Receiving Signals in Cities ................................ 115  
Transmission.................................................. 116  
Internal Beats ................................................. 116  
TROUBLESHOOTING ..................................................... 117  
INTERNAL BEATS FREQUENCY LIST ...................................... 121  
SPECIFICATIONS ....................................................... 122  
INDEX .................................................................... 134  
v
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THANK YOU  
Thank you for choosing this KENWOOD TH-K2AT/ E/ ET,  
TH-K4AT/ E transceiver. It has been developed by a  
team of engineers determined to continue the tradition  
of excellence and innovation in KENWOOD  
transceivers.  
Don’t let the size fool you! This small FM portable  
transceiver features a 5-watt transmitter and various  
selective calls without installing options. As you learn  
how to use this transceiver, you will also find that  
KENWOOD is pursuing “user friendliness”. For  
example, each time you change the Menu No. in Menu  
Mode, you will see a text message on the display that  
lets you know what you are configuring.  
Though user friendly, this transceiver is technically  
sophisticated and some features may be new to you.  
Consider this manual to be a personal tutorial from the  
designers. Allow the manual to guide you through the  
learning process now, then act as a reference in the  
coming years.  
FEATURES  
•
•
•
•
•
•
Compact design  
Aluminum die-cast chassis  
High output power (up to 5 W operation)  
100 memory channels or 50 channels with names  
Long operation period with a Ni-MH battery pack  
Menu allows for easy control and selecting of various  
functions.  
•
•
Optional PC software is available to manage the  
memory channel contents.  
Built-in VOX function  
vi  
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SUPPLIED ACCESSORIES  
After carefully unpacking the transceiver, identify the  
items listed in the table below. We recommend you  
keep the box and packings for the shipping.  
Quantity  
Accessory  
Part Number  
TH-K2AT  
K
K2  
M
M2  
Belt hook  
(w/ screws)  
J29-0709-XX  
1
1
1
1
Antenna  
T90-1018-XX  
J69-0342-XX  
A02-3817-XX  
W09-0991-XX  
W08-0959-XX  
W08-0960-XX  
B62-1696-XX  
B62-1697-XX  
B62-1699-XX  
B62-1695-XX  
B62-1702-XX  
B62-1757-XX  
B62-1758-XX  
–
1
–
–
1
–
1
1
1
–
–
–
–
–
1
1
–
1
–
–
–
1
1
–
–
–
–
–
1
1
1
–
1
1
–
1
–
–
–
–
–
–
–
1
1
1
–
–
–
1
–
–
1
–
–
–
–
Strap  
Battery case  
Ni-MH battery  
Charger  
E
S
G
C
I
Instruction  
Manual  
F
D
Warranty card  
vii  
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Quantity  
Accessory  
Part Number  
TH-K2E TH-K2ET  
E
E3  
Belt hook  
(w/ screws)  
Antenna  
J29-0709-XX  
1
1
T90-1018-XX  
J69-0342-XX  
A02-3817-XX  
W09-0991-XX  
W08-0959-XX  
W08-0960-XX  
B62-1696-XX  
B62-1697-XX  
B62-1699-XX  
B62-1695-XX  
B62-1702-XX  
B62-1757-XX  
B62-1758-XX  
–
1
1
–
1
1
–
1
1
1
–
1
1
1
1
1
1
–
1
1
–
1
1
1
–
1
1
1
1
Strap  
Battery case  
Ni-MH battery  
Charger  
E
S
G
C
I
Instruction  
Manual  
F
D
Warranty card  
viii  
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Quantity  
Accessory  
Part Number  
TH-K4AT TH-K4E  
M2  
E3  
Belt hook  
(w/ screws)  
J29-0709-XX  
1
1
Antenna  
T90-1019-XX  
J69-0342-XX  
A02-3817-XX  
W09-0991-XX  
W08-0959-XX  
W08-0960-XX  
B62-1696-XX  
B62-1697-XX  
B62-1699-XX  
B62-1695-XX  
B62-1702-XX  
B62-1757-XX  
B62-1758-XX  
–
1
1
1
–
–
–
1
–
–
1
–
–
–
–
1
1
–
1
1
–
1
1
1
–
1
1
1
1
Strap  
Battery case  
Ni-MH battery  
Charger  
E
S
G
C
I
Instruction  
Manual  
F
D
Warranty card  
ix  
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WRITING CONVENTIONS FOLLOWED  
The writing conventions described below have  
been followed to simplify instructions and avoid  
unnecessary repetition.  
Instruction  
Press [KEY].  
Press  
What to Do  
Press and release KEY.  
Press KEY1 momentarily, release  
[KEY1], [KEY2]. KEY1, then press KEY2.  
Press  
Press and hold KEY down for a  
[KEY] (1 s).  
second.  
Press and hold KEY1 down, then  
press KEY2. If there are more  
than two keys, press and hold  
down each key in turn until the  
final key has been pressed.  
Press  
[KEY1]+[KEY2].  
With the transceiver OFF, press  
and hold KEY, then switch ON  
the transceiver power by pressing  
Press  
[KEY]+[  
].  
[
] (POWER).  
Since the amateur radio bands are slightly different from  
country to country, the following meter band descriptions  
are used in this manual.  
•
•
2 m band: 144 ~ 148 MHz or 144 ~ 146 MHz  
70 cm band: 430 ~ 440 MHz  
x
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PREPARATION  
INSTALLING THE PB-43N Ni-MH BATTERY PACK  
Note: Because the battery pack is provided uncharged, you must  
charge the battery pack before using it with the transceiver. To  
charge the battery pack, refer to “CHARGING THE PB-43N Ni-MH  
BATTERY PACK (Other than TH-K2AT K2/ M2, TH-K4AT M2)” {page 6}.  
1 Unlock (open) the safety catch located at the bottom  
of the battery pack.  
2 Match the guides of the battery pack with the  
corresponding grooves on the upper rear of the  
transceiver, then firmly press the battery pack to lock  
it in place.  
3 Flip the safety catch into place to prevent  
accidentally pressing the release latch and removing  
the battery pack.  
1
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4 To remove the battery pack, lift the safety catch, then  
press the release latch to unlock the battery pack.  
Lift the battery pack away from the transceiver.  
INSTALLING ALKALINE BATTERIES  
1 To open the BT-14 battery case lid, insert your thumb  
or finger into the hole on the top of the battery case,  
then pull the cover up.  
2
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2 Insert (or remove) six AA (LR6) Alkaline batteries.  
•
Be sure to match the battery polarities with those  
marked in the bottom of the battery case.  
3 Align the two tabs at the bottom of battery case, then  
close the cover until the locking tabs on top click.  
4 To install the battery case onto (or remove it from)  
the transceiver, follow steps 1 to 3 of “INSTALLING THE  
PB-43N Ni-MH BATTERY PACK” {page 1}.  
Note:  
◆
Do not use Manganese batteries or Ni-Cd batteries in place of  
Alkaline batteries.  
◆
Always replace all batteries at the same time. Mixing old and new  
batteries or mixing types (such as Alkaline with zinc carbon) will  
reduce overall performance and could cause leakage or rupture.  
◆
◆
Remove all batteries from the case when it is not expected to be  
in use for several months.  
The voltage of new Alkaline batteries varies slightly, depending  
on the manufacturer. Thus, the high battery power indicator may  
not appear even though new Alkaline batteries are installed  
{page 83}.  
◆
To lift the battery pack safety catch, use a piece of hardened  
plastic or metal, such as a screwdriver, that is no more than  
6 mm wide and 1 mm thick. It is imperative that you place the  
implement under only the lip of the safety catch so that you do  
not damage the release latch.  
3
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INSTALLING THE ANTENNA  
Hold the supplied antenna by its base, then screw it into  
the connector on the top panel of the transceiver until  
secure.  
ATTACHING THE HAND STRAP (OTHER THAN TH-K2AT K/ K2)  
If desired, you can attach the supplied hand strap to the  
transceiver.  
Strap  
4
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INSTALLING THE BELT CLIP  
If desired, you can install the supplied belt clip to the  
transceiver.  
1 Loosely insert the two supplied screws into the holes  
on the back panel of the transceiver.  
2 Slide the belt hook into position, under the screws.  
3 Tighten the screws until secure.  
Note: When the belt hook is not attached to the transceiver, remove  
the screws from the transceiver to avoid scratching other materials.  
5
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CHARGING THE PB-43N Ni-MH BATTERY PACK  
(OTHER THAN TH-K2AT K2/ M2, TH-K4AT M2)  
The Ni-MH battery pack can be charged after it has  
been installed onto the transceiver. (The battery pack is  
provided uncharged for safety purposes.)  
1 Confirm that the transceiver power is OFF.  
•
While charging the battery pack, leave the transceiver  
power OFF.  
2 Insert the charger plug into the DC IN jack of the  
transceiver.  
DC IN jack  
3 Plug the charger into an AC wall outlet.  
•
Charging starts.  
4 It takes approximately 12 hours to charge an empty  
PB-43N Ni-MH battery pack. After 12 hours, remove  
the charger plug from the transceiver DC IN jack.  
5 Unplug the charger from the AC wall outlet.  
6
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Note:  
◆
◆
◆
Never leave the battery pack in direct sunlight.  
The transceiver becomes warm while charging the battery pack.  
While the battery pack is charged, the ambient temperature must  
be within 0°C ~ 40°C (32°F ~ 104°F). Otherwise, charging does  
not start. If the transceiver senses that the temperature is more  
than 60°C (140° F) during charging, the transceiver stops  
charging.  
◆
◆
◆
◆
Before recharging the battery pack, use the battery pack until the  
transceiver stops receiving.  
Do not plug the charger into the DC IN jack for more than 24  
hours.  
Unplug the charger as soon as possible after the charging period  
is over.  
After the battery pack is charged, do not unplug and plug the  
charger into the AC outlet again. Unpluging the charger will reset  
the charging timer and the battery pack will be charged again.  
This could result in over-charging.  
◆
If the battery pack is recharged repeatedly before the battery  
pack is not fully used, the memory effect (the battery pack will not  
allow the charger to recharge the battery to more than a certain  
voltage level) may occur. In this case, turn the transceiver ON  
until it stops receiving in order to discharge the battery pack, then  
recharge the battery pack as normal.  
◆
◆
If the battery pack is not used for a long time, the battery pack  
capacity temporarily decreases. In this case, charge the battery  
and use the battery pack until the transceiver stops receiving.  
Repeat this procedure a few times. The battery pack should  
recover its capacity.  
If the charger is plugged into the DC IN jack before the battery  
pack is attached, turn the transceiver power ON and then OFF  
again to initiate charging.  
◆
◆
Exceeding the specified charge period shortens the useful life of  
the PB-43N Ni-MH battery pack.  
The provided charger is designed to charge only the PB-43N  
Ni-MH battery pack. Charging other models of battery packs  
may damage the charger and battery pack.  
◆
◆
◆
Do not transmit while charging.  
When not in use, store the battery pack in a cool and dry place.  
Before charging the PB-43N Ni-MH battery pack, ensure that the  
safety catch is firmly closed.  
7
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CONNECTING TO A CIGARETTE LIGHTER SOCKET  
To connect the transceiver to the cigarette lighter socket  
in your vehicle, use an optional PG-3J Cigarette Lighter  
cable.  
When the PG-3J is connected to the cigarette lighter  
plug, the transceiver automatically starts charging the  
PB-43N Ni-MH battery pack. While you operate the  
transceiver, it charges the PB-43N Ni-MH battery pack  
in the background.  
To connect with an external 24 V power source via a DC-DC  
converter, only use the optional PG-3J Cigarette Lighter cable.  
Using the PG-2W DC cable in this situation may cause a fire.  
DC-DC Converter  
PG-3J  
24V  
24V  
24V  
12V  
Socket  
PG-3J  
12V  
DC-DC Converter  
12V  
PG-2W  
Note:  
◆
Do not use the PG-2W to connect a vehicle battery (12 V)  
directly. Extensive voltage could result in damaging the  
transceiver.  
◆
If the input voltage exceeds approximately 16.5 V, warning beeps  
sound and “DC ERR” appears.  
8
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CONNECTING TO A REGULATED POWER SUPPLY  
To connect the transceiver to an appropriate regulated  
DC power supply, use an optional PG-2W DC cable.  
1 Confirm that the power of both the transceiver and  
the DC power supply is OFF.  
2 Connect the optional PG-2W DC cable to the DC  
power supply; the red lead to the positive (+)  
terminal, and the black lead to the negative (–)  
terminal.  
Fuses (4 A)  
3 Connect the barrel plug on the DC cable to the  
DC IN jack of the transceiver.  
While a DC power supply is connected with the DC IN  
jack, the transceiver automatically initiates charging the  
PB-43N Ni-MH battery pack.  
Note:  
◆
If the DC power supply voltage is below 12.0 V DC, you may not  
be able to charge the PB-43N Ni-MH battery pack.  
◆
The supply voltage must be between 12.0 V and 16.0 V to  
prevent damaging the transceiver. If the input voltage exceeds  
approximately 16.5 V, warning beeps sound and “DC ERR”  
appears. Remove the DC IN jack plug immediately.  
◆
If the DC power supply voltage is above 14.5 V DC and “  
”
(High Power) is selected, the “ ” icon blinks and the output  
power is gradually reduced to “ ” level (Medium Power)  
{page 95}.  
9
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YOUR FIRST QSO  
FIRST QSO  
Are you ready to give your transceiver a quick try?  
Reading this chapter should get your voice on the air  
right away. The instructions below are intended only for  
a quick guide. If you encounter problems or there is  
something you would like to know more, read the  
detailed explanations given later in this manual.  
1 Press and hold [ ] (POWER) briefly to switch the  
transceiver power ON (TH-K2AT/ E/ ET example  
shown below).  
10  
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•
•
A high pitched double beep sounds and a Power-ON  
message appears momentarily. The various indicators  
and the current operating frequency appear on the LCD.  
The transceiver stores the current parameters when it  
is turned OFF and automatically recalls these  
parameters the next time you turn the transceiver ON.  
2 Turn the VOL control clockwise, to the 11 o’clock  
position.  
3 Turn the Tuning control to select a reception  
frequency.  
.
C
N
E
•
You may further turn the VOL control to adjust the  
volume level of the signal.  
4 To transmit, hold the transceiver approximately 5 cm  
(2 inches) from your mouth.  
5 Press and hold [PTT], then speak in your normal  
tone of voice.  
6 Release [PTT] to receive.  
7 Repeat steps 4, 5 and 6 to continue communication.  
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GETTING ACQUAINTED  
KEYS AND CONTROLS  
Tuning control  
VOL control  
Antenna connector  
LED  
(TX:Red RX:Green)  
PTT switch  
Display (LCD)  
SP/MIC jack  
Power Switch  
LAMP key  
DC IN jack  
MONI/SQL key  
Keypad  
MENU key  
TH-K2AT/ ET/ K4AT  
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Tuning control  
VOL control  
Antenna connector  
LED  
(TX:Red RX:Green)  
PTT switch  
Display (LCD)  
SP/MIC jack  
Power Switch  
LAMP key  
DC IN jack  
MONI/SQL key  
Keypad  
MENU key  
TH-K2E/ K4E  
13  
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DISPLAY  
w
e
r
y
u i o !  
!
q
t
!
q
!
! ! ! !  
!
Appears when the CTCSS function is activated  
{page 69}.  
w
Appears when the Tone function is activated  
{page 34}.  
e
Appears when the DCS function is activated {page 73}.  
r
Appears when the repeater shift function is activated  
{pages 31 ~ 34, 37}.  
t
Appears when the Reverse function is activated  
{page 38}.  
y
Appears when the Automatic Simplex Check (ASC)  
function is activated {page 38}.  
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u
Appears when a Priority Scan function is activated  
{page 65}.  
i
Displays the frequencies, Menu settings, Memory name  
and other information.  
o
Appears when the Weather Alert function is activated  
{page 55}.  
!
Appears when narrow FM Mode is selected {page 91}.  
0
!
Displays the Menu No., memory channel number, and  
status {pages 24, 41}.  
1
!
Appears when the displayed memory channel has data  
{page 44}.  
2
!
Appears when the Lock function is ON {page 88}.  
3
!
Appears when the Memory Channel Lockout function is  
ON {page 67}.  
4
!
Appears when the VOX function is ON {page 96}.  
5
!
6
S-meter (RX) and remaining battery capacity indicator  
(TX). Confirm the remaining battery capacity when the  
transceiver transmits {page 83}.  
15  
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!
Appears when the function key is pressed.  
7
!
8
appears when high power transmission is selected,  
appears when medium power is selected, and  
appears when low power is selected {page 95}.  
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BASIC OPERATION  
Switching the Power ON/OFF  
1 Press [ ] (POWER) briefly to switch the transceiver  
power ON.  
•
A high pitched double beep sounds and a Power-ON  
message {page 92} appears briefly, followed by the  
frequency and other indicators.  
2 To switch the transceiver OFF, press [ ] (POWER)  
again.  
•
•
When you turn the transceiver OFF, a low pitched  
double beep sounds.  
The transceiver stores the current frequency and  
parameters when it is turned OFF and recalls these  
parameters the next time you turn the transceiver ON.  
Adjusting the Volume  
Turn the VOL control clockwise to increase the audio  
output level and counterclockwise to decrease the  
output level.  
ENC.  
•
If you are not receiving a signal, press and hold  
[MONI/SQL] to unmute the speaker, then adjust the  
VOL control to a comfortable audio output level.  
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Adjusting the Squelch  
The purpose of Squelch is to mute the speaker when no  
signals are present. With the squelch level correctly set,  
you will hear sound only while actually receiving signals.  
The higher the selected squelch level, the stronger the  
signals must be to receive.  
The appropriate squelch level depends on the ambient  
RF noise conditions.  
1 Press [F], [MONI/SQL].  
•
The current squelch level appears.  
2 Turn the Tuning control to adjust the level.  
•
•
•
Select the level at which the background noise is just  
eliminated when no signal is present.  
The higher the level, the stronger the signals must be  
to receive.  
6 different levels can be set.  
(0: Minimum ~ 5: Maximum; 2 is the default value)  
3 Press any key other than [LAMP], [MONI/SQL] to  
store the new setting and exit the squelch  
adjustment.  
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Transmitting  
1 To transmit, hold the transceiver approximately 5 cm  
(2 inches) from your mouth, then press and hold  
[PTT] and speak into the microphone in your normal  
tone of voice.  
•
•
The LED lights red and the bar-graph meter appears.  
If you press [PTT] while you are outside of the  
transmission coverage, a high pitched error beep  
sounds.  
2 When you finish speaking, release [PTT].  
Note: If you continuously transmit for longer than the time specified  
in Menu No. 23 (default is 10 minutes) {page 94}, the internal time-  
out timer generates a warning beep and the transceiver stops  
transmitting. In this case, release [PTT] and let the transceiver cool  
down for a while, then press [PTT] again to resume transmission  
{page 116}.  
■ Selecting an Output Power  
Selecting a lower transmission power is the best way  
to reduce battery consumption, if communication is  
still reliable. You can configure different power levels  
for transmission {page 95}.  
Press [F], [PTT] to cycle between “ ” (high), “  
”
(medium), and “ ” (low).  
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Selecting a Frequency  
■ VFO Mode  
This is the basic mode for changing the operating  
frequency. Turn the Tuning control clockwise to  
increase the frequency and counterclockwise to  
decrease the frequency.  
■ MHz Mode  
If the desired operating frequency is far away from  
the current frequency, it is quicker to use the MHz  
Tuning Mode.  
To adjust the MHz digit:  
1 Press [F].  
•
The MHz digit blinks.  
2 Turn the Tuning control to select the desired MHz  
value.  
3 After selecting the desired MHz value, press [F]  
to exit the mode and return to normal VFO Mode.  
4 Continue adjusting the frequency as necessary,  
using the Tuning control.  
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■ Direct Frequency Entry (TH-K2AT/ ET/ K4AT only)  
In addition to turning the Tuning control, there is  
another way to select the frequency. When the  
desired frequency is far away from the current  
frequency, you can directly enter a frequency using  
the numeric keypad.  
1 Press [VFO].  
•
You must be in the VFO Mode to make the direct  
frequency entry.  
2 Press [#].  
3 Press the numeric keys ([0] to [9]) to enter your  
desired frequency. [ ] allows you to complete the  
MHz digits entry.  
•
Pressing [#] fills all remaining digits (the digits you  
did not enter) with 0 and completes the entry. For  
example, to select 145.000 MHz, press [1], [4], [5]  
and press [#] to complete the entry.  
•
If you want to revise the MHz digits only, leaving the  
kHz digits as they are, press [VFO] in place of [#].  
Example 1  
To enter 145.750 MHz:  
Key in  
Display  
[#]  
– – – – – –  
1 4 5. – – –  
1 4 5. 7 5 0  
[1], [4], [5]  
[7], [5], [0]  
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Example 2  
To enter 145.000 MHz:  
Key in  
[#]  
Display  
– – – – – –  
1 4 5. – – –  
1 4 5. 0 0 0  
[1], [4], [5]  
[#]  
Example 3 (Short cut)  
To enter 145.000 MHz:  
Key in  
Display  
1 4 4. 6 2 5  
– – – – – –  
5 – –. – – –  
1 4 5. – – –  
1 4 5. 0 0 0  
[#]  
[5]  
[ ]  
[#]  
Example 4  
To change 144.650 MHz to 145.650 MHz:  
Key in  
Display  
1 4 4. 6 5 0  
– – – – – –  
1 4 5. – – –  
1 4 5. 6 5 0  
[#]  
[1], [4], [5]  
[VFO]  
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Example 5 (Short cut)  
To change 144.650 MHz to 145.650 MHz:  
Key in  
Display  
1 4 4. 6 5 0  
– – – – – –  
5 – – – – –  
1 4 5. – – –  
1 4 5. 6 5 0  
[#]  
[5]  
[ ]  
[VFO]  
Example 6  
To change 145.200 MHz to 145.750 MHz:  
Key in  
Display  
1 4 5. 2 0 0  
– – – – – –  
1 4 5. – – –  
1 4 5. 7 5 0  
[#]  
[ ]  
[7], [5], [0]  
Note:  
◆
If the entered frequency does not match the current  
frequency step size, the frequency is automatically rounded  
down to the next available frequency.  
◆
◆
When the desired frequency cannot be entered exactly,  
confirm the frequency step size {page 86}.  
If you turn the Tuning control while entering the frequency,  
the transceiver clears the entry and changes to the next  
available frequency.  
23  
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MENU SETUP  
WHAT IS A MENU?  
Many functions on this transceiver are selected or  
configured via a software-controlled Menu rather than  
through the physical controls of the transceiver. Once  
you become familiar with the Menu system, you will  
appreciate its versatility. You can customize the various  
timings, settings, and programming functions on this  
transceiver to meet your needs without using many  
controls and switches.  
MENU ACCESS  
1 Press [MENU].  
•
A brief explanation of the Menu, and the setting and  
Menu No. appear on the display.  
Parameter Menu No.  
Function  
2 Turn the Tuning control to select your desired Menu.  
•
As you change the Menu No., a brief explanation of  
each Menu appears along with its current parameter.  
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3 Press [MENU] to configure the parameter of the  
currently selected Menu No.  
4 Turn the Tuning control to select your desired  
parameter.  
5 Press [MENU] to store the new setting. Otherwise,  
press any key other than [LAMP], [MONI/SQL] or  
[
] (POWER) to cancel.  
Note:  
◆
The [LAMP] and [MONI/SQL] keys can be operated while  
configuring the Menu.  
◆
We recommend you pressing [PTT] to cancel the parameter  
setting and restore its old value. However, you can also press  
any key other than [LAMP], [MONI/SQL] or [MENU] to cancel.  
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MENU FUNCTION LIST  
On the Menu  
Display No.  
Ref.  
Function  
Selections Default  
Page  
5/ 6.25/ 10/  
5/ 12.5/  
Frequency step  
size  
STP1  
1
12.5/ 15/ 20/ 25/  
25  
86  
30/ 50/ 100 kHz  
34,  
69, 73  
Tone/ CTCSS/ OFF/ TONE/  
DCS selection CTCSS/ DCS  
T.CT.DCS  
2
3
4
OFF  
88.5  
88.5  
T
Tone frequency 67.0 ~ 254.1 Hz  
35  
70  
CTCSS  
CT  
67.0 ~ 254.1 Hz  
frequency  
DCS  
SFT  
5
6
DCS code  
023 ~ 754  
023  
74  
32  
Shift direction  
OFF/ +/ –/ –7.6  
OFF  
136 ~ 174 MHz  
(TH-K2AT)  
144 ~ 146 MHz  
Programmable (TH-K2E/ ET)  
P.VFO  
7
93  
VFO  
400 ~ 470 MHz  
(TH-K4AT)  
430 ~ 440 MHz  
(TH-K4E)  
0.600/  
1.600/  
5.000  
Repeater offset 0.000 ~ 69.950  
OFFSET1  
8
9
33  
frequency  
MHz  
Automatic  
Repeater Offset  
ARO2  
PRI  
ON/ OFF  
ON  
OFF  
TO  
37  
66  
68  
10 Priority scan  
ON/ OFF  
Scan resume  
method  
SCAN  
11  
TO/ CO/ SE  
Memory channel  
lockout  
Memory channel  
capacity  
L.OUT  
M.CH  
12  
ON/ OFF  
50/ 100  
OFF  
50  
67  
41  
13  
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On the Menu  
Display No.  
Ref.  
Page  
Function  
Selections Default  
M.NAME  
14 Memory name 6 characters  
–
48  
Memory name/  
MDF  
15 Frequency  
display  
MN/ FRQ  
MN  
49  
OFF/ 0.2/ 0.4/  
0.6/ 0.8/ 1.0/  
2.0/ 3.0/ 4.0/ 5.0  
OFF/ 30/ 60/ 90/  
120/ 180 min.  
SAV  
16 Battery saver  
1.0  
30  
84  
Automatic  
17  
APO  
CK1  
82  
36, 64  
36  
Power-OFF  
CALL/  
1750  
18 CALL key  
CALL/ 1750  
ON/ OFF  
1750 Hz tone  
TX hold  
HLD  
19  
OFF  
VOX  
VXB  
20 VOX function  
21 VOX on busy  
OFF/ 1 ~ 9  
ON/ OFF  
OFF  
OFF  
96  
100  
250/ 500/ 750/  
1000/ 1500/  
VD  
22 VOX delay  
500  
99  
2000/ 3000 ms  
TOT  
BCL  
TXI  
23 Time-out Timer 3/ 5/ 10 minutes  
Busy channel  
10  
OFF  
OFF  
–
94  
86  
95  
92  
24  
ON/ OFF  
lockout  
25 TX inhibit  
ON/ OFF  
Power-ON  
message  
P.ON.MSG 26  
6 characters  
BP  
27 Beep  
ON/ OFF  
ON/ OFF  
ON/ OFF  
ON  
OFF  
OFF  
85  
85  
91  
BS  
28 Beat Shift  
29 Narrow FM  
FMN  
Tuning control  
unlock  
ENC  
30  
ON/ OFF  
OFF  
89  
27  
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On the Menu  
Display No.  
Ref.  
Page  
Function  
Selections Default  
PC  
31 PC control  
ON/ OFF  
OFF  
–
107  
DTMF.MR  
SPD  
32 Automatic dialer Up to 16 digits  
33 DTMF TX speed FA/ SL  
77  
FA  
80  
DT.H3  
34 DTMF TX hold ON/ OFF  
OFF  
77  
100/ 250/ 500/  
DTMF pause  
PA  
35  
750/ 1000/  
500  
80  
period  
1500/ 2000 ms  
DT.L  
36 DTMF key lock ON/ OFF  
37 Weather Alert ON/ OFF  
99 Reset selection VFO/ FULL  
OFF  
OFF  
VFO  
81  
56  
WXA4  
RESET  
111  
1
Default settings vary according to the transceiver model you are  
using. See the reference page to determine which default setting  
is available for your transceiver.  
2
3
4
Only available for TH-K2AT K/ K2 and TH-K2E/ ET  
Only available for TH-K2AT/ ET and TH-K4AT  
Only available for TH-K2AT K/ K2  
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ALPHABETICAL FUNCTION LIST  
On the Menu  
Ref.  
Page  
Selections  
Default  
Display No.  
APO  
17 OFF/ 30/ 60/ 90/ 120/ 180 min.  
ON/ OFF  
30  
ON  
82  
37  
86  
85  
85  
ARO2  
BCL  
BP  
9
24 ON/ OFF  
27 ON/ OFF  
28 ON/ OFF  
OFF  
ON  
BS  
OFF  
CALL/  
1750  
36,  
64  
CK1  
18 CALL/ 1750  
CT  
4
5
67.0 ~ 254.1 Hz  
023 ~ 754  
88.5  
023  
–
70  
74  
77  
77  
81  
89  
91  
36  
67  
41  
49  
48  
DCS  
DTMF.MR  
DT.H3  
DT.L  
32 Up to 16 digits  
34 ON/ OFF  
36 ON/ OFF  
30 ON/ OFF  
29 ON/ OFF  
19 ON/ OFF  
12 ON/ OFF  
13 50/ 100  
OFF  
OFF  
OFF  
OFF  
OFF  
OFF  
50  
ENC  
FMN  
HLD  
L.OUT  
M.CH  
MDF  
15 MN/ FRQ  
14 6 characters  
MN  
–
M.NAME  
0.600/  
1.600/  
5.000  
0.000 ~ 69.950 MHz in steps of  
50 kHz  
OFFSET1  
PA  
8
33  
80  
100/ 250/ 500/ 750/ 1000/ 1500/  
2000 ms  
35  
500  
PC  
31 ON/ OFF  
OFF  
–
107  
92  
P.ON.MSG  
26 6 characters  
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On the Menu  
Display No.  
Ref.  
Page  
Selections  
Default  
PRI  
10 ON/ OFF  
OFF  
66  
136 ~ 174 MHz (TH-K2AT)  
144 ~ 146 MHz (TH-K2E/ ET)  
400 ~ 470 MHz (TH-K4AT)  
430 ~ 440 MHz (TH-K4E)  
P.VFO  
7
93  
RESET  
SAV  
99 VFO/ FULL  
OFF/ 0.2/ 0.4/ 0.6/ 0.8/ 1.0/ 2.0/  
3.0/ 4.0/ 5.0  
11 TO/ CO/ SE  
OFF/ +/ –/ –7.6  
33 FA/ SL  
VFO  
1.0  
111  
84  
16  
SCAN  
SFT1  
SPD  
TO  
OFF  
FA  
68  
32  
80  
6
5/ 6.25/ 10/ 12.5/ 15/ 20/ 25/ 30/ 5/ 12.5/  
STP1  
1
3
2
86  
35  
50/ 100 kHz  
25  
T
67.0 ~ 254.1 Hz  
88.5  
34,  
69, 73  
T.CT.DCS  
OFF/ TONE/ CTCSS/ DCS  
OFF  
TOT  
TXI  
23 3/ 5/ 10 minutes  
25 ON/ OFF  
10  
94  
95  
OFF  
250/ 500/ 750/ 1000/ 1500/  
2000/ 3000 ms  
VD  
22  
500  
99  
VOX  
VXB  
20 OFF/ 1 ~ 9  
21 ON/ OFF  
37 ON/ OFF  
OFF  
OFF  
OFF  
96  
100  
56  
WXA4  
1
Default settings vary according to the transceiver model you are  
using. See the reference page to determine which default setting  
is available for your transceiver.  
2
3
4
Only available for TH-K2AT K/ K2 and TH-K2E/ ET  
Only available for TH-K2AT/ ET and TH-K4AT  
Only available for TH-K2AT K/ K2  
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OPERATING THROUGH REPEATERS  
Repeaters, which are often installed and maintained by  
radio clubs, are usually located on mountain tops or  
other elevated locations. They generally operate at  
higher ERP (Effective Radiated Power) than a typical  
station. This combination of elevation and high ERP  
allows communications over much greater distances  
than communicating without using repeaters.  
Most repeaters use a receive and transmit frequency  
pair with a standard or non-standard offset (odd-split).  
In addition, some repeaters must receive a tone from  
the transceiver to be accessed. For details, consult your  
local repeater reference.  
TX: 144.725 MHz  
TX tone: 88.5 Hz  
RX: 145.325 MHz  
TX: 144.725 MHz  
TX tone: 88.5 Hz  
RX: 145.325 MHz  
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OFFSET PROGRAMMING FLOW  
q
Select a receive frequency.  
w Select an offset direction.  
e
Select an offset frequency  
(only when programming odd-split  
repeater frequencies).  
r
t
Activate the Tone function  
(if necessary).  
Select a tone frequency  
(if necessary).  
If you store all the above data in a memory channel, you  
will not need to reprogram the parameters every time.  
Refer to “MEMORY CHANNELS” {page 41}.  
Programming an Offset  
You must first select an amateur radio repeater downlink  
frequency as described in “Selecting an Offset  
Frequency” {page 33}.  
■ Selecting an Offset Direction  
Select whether the transmission frequency will be  
higher (+) or lower (–) than the reception frequency.  
32  
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1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 6  
(SFT).  
3 Press [MENU].  
4 Turn the Tuning control to select “+” or “–”.  
•
To program a –7.6 MHz offset (TH-K4E only),  
select “–7.6” instead.  
5 Press [MENU] to store the setting or [PTT] to  
cancel.  
•
“+” or “–” (or “ ”) appears above the frequency,  
indicating which offset direction is selected.  
If the offset transmission frequency falls outside the  
allowable range, transmission is inhibited. In this  
case, adjust the reception frequency so that the  
transmission frequency is within the band limits.  
Note: While using an odd-split memory channel or transmitting,  
you cannot change the offset direction.  
■ Selecting an Offset Frequency  
To access a repeater which requires an odd-split  
frequency pair, change the offset frequency from the  
default which is used by most repeaters. The default  
offset frequency on the 2 m band is 600 kHz (all  
TH-K2 models); the default on the 70 cm band is  
5.0 MHz (TH-K4AT) or 1.6 MHz (TH-K4E).  
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1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 8  
(OFFSET).  
3 Press [MENU].  
4 Turn the Tuning control to select the appropriate  
offset frequency.  
•
The selectable range is from 0.000 MHz to 69.950  
MHz in steps of 50 kHz.  
5 Press [MENU] to store the setting or [PTT] to  
cancel.  
6 Press any key other than [LAMP], [MONI/SQL],  
and [MENU] to exit Menu Mode.  
TH-K4E only: If you have selected “ ” for the offset direction, you  
cannot change the default (–7.6 MHz) offset frequency.  
Note: After changing the offset frequency, the new offset  
frequency will also be used by Automatic Repeater Offset.  
■ Activating the Tone Function  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 2  
(T.CT.DCS).  
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3 Press [MENU].  
4 Turn the Tuning control to select “TONE”.  
5 Press [MENU] to store the setting or [PTT] to  
cancel.  
6 Press any key other than [LAMP], [MONI/SQL],  
and [MENU] to exit Menu Mode.  
•
“T” appears when the Tone function is ON.  
Note: You cannot use the Tone and CTCSS/ DCS functions at  
the same time. Switching the Tone function ON after activating  
the CTCSS/ DCS deactivates the CTCSS/ DCS function.  
TH-K2E/ ET/ K4E only: When you access repeaters that require  
a 1750 Hz tone, you do not need to activate the Tone function.  
Simply press [CALL] without pressing [PTT] switch to transmit a  
1750 Hz tone (default setting).  
■ Selecting a Tone Frequency  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 3 (T).  
3 Press [MENU].  
4 Turn the Tuning control to select the desired tone  
frequency.  
5 Press [MENU] to store the setting or [PTT] to  
cancel.  
6 Press any key other than [LAMP], [MONI/SQL],  
and [MENU] to exit Menu Mode.  
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Available Tone Frequencies  
Tone Frequency (Hz)  
67.0 82.5 100.0 123.0 151.4 186.2 225.7  
69.3 85.4 103.5 127.3 156.7 192.8 229.1  
71.9 88.5 107.2 131.8 162.2 203.5 233.6  
74.4 91.5 110.9 136.5 167.9 206.5 241.8  
77.0 94.8 114.8 141.3 173.8 210.7 250.3  
79.7 97.4 118.8 146.2 179.9 218.1 254.1  
Note: 42 different tones are available for the transceiver. These  
42 tones includes 37 EIA standard tones and 5 non-standard  
tones.  
TH-K2E/ ET/ K4E only:  
◆
To transmit a 1750 Hz tone, simply press [CALL] without  
pressing [PTT] (default setting). Release [CALL] to quit  
transmitting. You can also make the transceiver remain in the  
transmit mode for 2 seconds after releasing [CALL]; a 1750  
Hz tone is not continuously transmitted. Access Menu No. 19  
(HLD) and select “ON”.  
If you want to use [CALL] for recalling the Call channel in  
place of transmitting a 1750 Hz tone, access Menu No. 18  
(CK) and select “CALL”.  
◆
TH-K2E/ 4E only:  
◆
If you press [CALL] while transmitting, 1750 Hz tone will be  
transmitted.  
TH-K2AT/ ET/ K4AT only:  
◆
If you press [CALL] while transmitting, DTMF D code will be  
transmitted.  
36  
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AUTOMATIC REPEATER OFFSET (TH-K2AT/ E/ ET ONLY)  
This function automatically selects an offset direction,  
according to the frequency on the 2 m band. The  
transceiver is programmed for offset direction as shown  
below. To obtain an up-to-date band plan for repeater  
offset direction, contact your national Amateur Radio  
association.  
TH-K2AT K/ K2 only  
144.0  
145.5  
146.4  
147.0  
147.6  
148.0 MHz  
145.1  
146.0  
146.6  
147.4  
–
–
–
+
+
S
S
S
S
S: Simplex  
This complies with the standard ARRL band plan.  
TH-K2E/ K2ET only  
144.0  
145.6 145.8 146.0 MHz  
S
S
–
S: Simplex  
Note: Automatic Repeater Offset does not function when the  
Reverse function is ON {page 38}. However, pressing [F], [MENU]  
after Automatic Repeater Offset has selected an offset (split) status,  
exchanges the receive and transmit frequencies.  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 9 (ARO).  
3 Press [MENU].  
4 Turn the Tuning control to switch the function “ON”  
(default) or “OFF”.  
5 Press [MENU] to store the setting or [PTT] to cancel.  
37  
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REVERSE FUNCTION  
The Reverse function exchanges a separate reception  
and transmission frequency. So, while using a repeater,  
you can manually check the strength of a signal that you  
receive directly from the other station. If the station’s  
signal is strong, both stations should move to a simplex  
frequency and free up the repeater.  
To swap the transmission and reception frequencies:  
Press [F], [MENU] to switch the Reverse function ON  
(or OFF).  
•
“R” appears when the function is ON.  
Note: You can turn the Reverse function ON when you are operating  
in Simplex Mode. However, it does not change the Transmission/  
Reception frequency.  
AUTOMATIC SIMPLEX CHECK (ASC)  
While using a repeater, the ASC function periodically  
checks the strength of the signal you are receiving from  
the other station. If the station’s signal is strong enough  
to allow direct contact without a repeater, the “ ”  
indicator starts blinking.  
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Press [F], [MENU] (1 s) to switch the function ON (or  
OFF).  
•
•
“
” appears when the function is ON.  
While direct contact is possible, “ ” blinks.  
Note:  
◆
◆
Pressing [PTT] switch causes the “ ” icon to quit blinking.  
ASC can be activated while operating in Simplex mode.  
However, it does not change the Transmission/ Reception  
frequencies.  
◆
◆
ASC does not function during scan.  
ASC does not function while Weather Alert function is activated  
(TH-K2AT K/ K2 only) {page 55}.  
◆
◆
Activating ASC while using Reverse, turns Reverse function OFF.  
If you recall a memory channel or the Call Channel that contains  
a Reverse ON status, ASC is switched OFF.  
◆
ASC causes received audio to be momentarily intermitted every  
3 seconds.  
TONE FREQ. ID SCAN  
This function scans through all tone frequencies to  
identify the incoming tone frequency on a received  
signal. You can use this function to determine which  
tone frequency is required by accessing your local  
repeater.  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 3 (T).  
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3 Press [MENU] (1 s).  
•
•
When the transceiver receives a signal, scan starts.  
The decimal point blinks during scan.  
While the transceiver is receiving a signal during Tone  
Freq. ID Scan, the signal is emitted from the speaker.  
•
•
•
To reverse the scan direction, turn the Tuning control.  
To quit the function, press [PTT].  
When the tone frequency is identified, a beep sounds  
and the identified frequency blinks.  
4 Press [MENU] to program the identified frequency in  
place of the current tone frequency.  
•
Press any key other than [MENU], [LAMP], and  
[MONI/SQL] if you do not want to program the  
identified frequency.  
•
Turn the Tuning control while the identified frequency  
is blinking to resume scanning.  
Note: Some repeaters do not re-transmit the access tone in the  
downlink signal. In this case, check the other station’s uplink signal  
to detect the repeater access tone.  
40  
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MEMORY CHANNELS  
In memory channels, you can store frequencies and  
related data that you frequently use so that you do not  
need to reprogram that data every time. You can quickly  
recall a programmed channel through simple operation.  
A total of 100 memory channels (50 when using the  
Memory Name function) are available for storing  
frequencies, modes and other operating conditions.  
NUMBER OF MEMORY CHANNELS  
The transceiver must be configured to either 100  
memory channels without using the Memory Name  
function or 50 memory channels with the Memory Name  
function (default).  
To change the memory channel capacity:  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 13  
(M.CH).  
3 Press [MENU].  
4 Turn the Tuning control to select either “50” (default)  
or “100”.  
5 Press [MENU].  
•
“SURE ?” appears.  
6 Press [MENU] to accept or press any key other than  
[MENU], [LAMP], and [MONI/SQL] to cancel.  
41  
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Note:  
◆
If you change the memory channel capacity from 100 channels to  
50 channels after having stored data in channels 50 to 99, all  
memory channel data in channels 50 to 99 will be erased.  
◆
If you change the memory channel capacity from 50 channels to  
100 channels after storing Memory names in those channels, all  
Memory name data will be erased.  
SIMPLEX & REPEATER OR ODD-SPLIT MEMORY CHANNEL?  
You can use each memory channel as a simplex &  
repeater channel or an odd-split channel. Store only  
one frequency to use as a simplex & repeater channel  
or two separate frequencies to use as an odd-split  
channel. Select either application for each channel  
depending on the operations you have in mind.  
Simplex & repeater channels allow:  
•
•
Simplex frequency operation  
Repeater operation with a standard offset (if an offset  
direction is stored)  
Odd-split channels allow:  
•
Repeater operation with a non-standard offset  
Note: Not only you can store data in memory channels, but you can  
also overwrite existing data with new data.  
42  
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The data listed below can be stored in each memory  
channel:  
Simplex &  
Repeater  
Parameter  
Odd-Split  
Reception frequency  
Transmission frequency  
Tone frequency  
Tone ON  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
N/A  
N/A  
N/A  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
CTCSS frequency  
CTCSS ON  
DCS code  
DCS ON  
Offset direction  
Offset frequency  
Reverse ON  
Frequency step size  
Narrow band FM  
Beat Shift  
Memory Channel Lockout  
Memory Channel Name  
Yes: Can be stored in memory.  
N/A: Cannot be stored in memory.  
43  
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Storing Simplex Frequencies or Standard Repeater Frequencies  
1 Press [VFO].  
2 Turn the Tuning control to select your desired  
frequency.  
•
You can also directly enter a desired frequency using  
the keypad (TH-K2AT/ ET/ K4AT only) {page 21}.  
3 If storing a standard repeater frequency, select the  
following data:  
•
•
•
Offset direction {page 32}  
Tone function, if necessary {page 34}  
CTCSS/ DCS function, if necessary {pages 69, 73}  
If storing a simplex frequency, you may select other  
related data (CTCSS or DCS settings, etc.).  
4 Press [F], [MR].  
•
•
A memory channel number appears and blinks.  
” appears if the channel contains data.  
“
•
Memory channel number L0/U0 ~ L2/U2 {page 61},  
Pr (Priority Channel) {page 65} and AL (Weather Alert)  
{page 55} (TH-K2AT K/ K2 only) are reserved for other  
functions.  
5 Turn the Tuning control to select the memory  
channel in which you want to store the data.  
6 Press [MR] to store the data to the channel.  
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Storing Odd-Split Repeater Frequencies  
Some repeaters use a pair of reception and  
transmission frequencies with a non-standard offset.  
If you store two separate frequencies in a memory  
channel, you can operate on those repeaters without  
programming the offset frequency and direction.  
1 Store the desired reception frequency and related  
data by following the procedure given for simplex or  
standard repeater frequencies {page 44}.  
2 Turn the Tuning control to select the desired  
transmission frequency.  
3 Press [F], [MR].  
4 Turn the Tuning control to select the memory  
channel you programmed in step 1.  
5 Press [PTT]+[MR].  
•
The transmission frequency is stored in the memory  
channel.  
Note: When you recall an odd-split memory channel, “+” and “–”  
appear on the display. To confirm the transmission frequency, press  
[F], [MENU] (Reverse function) {page 38}.  
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Recalling a Memory Channel  
■ Using the Tuning Control  
1 Press [MR] to enter Memory Recall Mode.  
•
The memory channel last used is recalled.  
2 Turn the Tuning control to select your desired  
memory channel.  
•
•
You cannot recall an empty memory channel.  
To restore VFO Mode, press [VFO].  
■ Using a Numeric Keypad (TH-K2AT/ ET/ K4AT only)  
You can also recall a memory channel by entering a  
desired memory channel number with the keypad.  
1 Press [MR] to enter Memory Recall Mode.  
2 Press [#], then enter the channel number using  
2 digits.  
•
•
For example, to recall channel 49, press [#], [4],  
[9].  
You can also enter a memory channel number that  
is less than 10 by pressing [#] after entering the  
channel number. For example, to recall memory  
channel 9, press [#], [9], [#]. You can also press  
[#], [0], [9].  
46  
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Note:  
◆
You cannot recall an empty memory channel. An error beep  
sounds.  
◆
You cannot recall the Program Scan memory channels  
(L0/U0 ~ L2/U2), Priority Channel (Pr) and Weather Alert  
(AL) (TH-K2AT K/ K2 only) using the numeric keypad.  
◆
◆
When you recall an odd-split memory channel, “+” and “–”  
appear on the display. Press [F], [MENU] (Reverse function)  
{page 38} to display the transmission frequency.  
After recalling a memory channel, you may modify data such  
as Tone or CTCSS. However, these settings are cleared  
once you select another channel or the VFO Mode. To  
permanently store the data, overwrite the channel contents  
{page 44}.  
CLEARING A MEMORY CHANNEL  
To clear the data from an individual memory channel:  
1 Recall the memory channel you want to clear the  
data.  
2 Press and hold [ ] (POWER) to switch the  
transceiver OFF.  
3 Press [MR]+[ ] (POWER).  
•
A confirmation message appears.  
4 Press [MR] to clear the channel data.  
•
•
The contents of the memory channel are cleared.  
To quit clearing the memory channel, press any key  
other than [MR], [LAMP], [MONI/SQL] and [  
]
(POWER).  
47  
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Note:  
◆
◆
Call Channel data cannot be cleared.  
You can also clear the Priority Channel, L0/U0 ~ L2/U2 and  
Weather Alert data.  
◆
◆
While the trasceiver is in Channel Display Mode or Lock function  
is activated, you cannot clear the channel data.  
To clear all memory channels contents at once, perform Full  
Reset {page 111}.  
NAMING A MEMORY CHANNEL  
You can name memory channels using up to 6  
alphanumeric characters. When you recall a named  
memory channel, its name appears on the display in  
place of the stored frequency. Names can be call signs,  
repeater names, cities, names of people, etc. In order  
to use the Memory Name function, the memory channel  
capacity must be set to 50 channels. To change the  
memory channel capacity from 100 to 50, access Menu  
No. 13 (M.CH) {page 41}.  
1 Press [MR] to recall your desired memory channel.  
2 Press [MENU] to enter Menu Mode.  
3 Turn the Tuning control to select Menu No. 14  
(M.NAME).  
4 Press [MENU].  
•
A blinking cursor appears.  
5 Turn the Tuning control to select a desired  
alphanumeric character.  
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•
•
You can enter the following alphanumeric characters:  
0 ~ 9, A ~ Z, – (hyphen), / (slash), and a space.  
Press [MONI/SQL] to delete the character at the  
current cursor position.  
6 Press [MENU].  
•
The cursor moves to the next digit.  
7 Repeat steps 5 and 6 to enter up to 6 digits.  
•
To complete the entry, press [MENU] without selecting  
a character.  
•
•
Press [MONI/SQL] to delete a character.  
Press any key other than [MONI/SQL], [MENU], and  
[LAMP] to cancel the entry.  
After storing a Memory name, the Memory name  
appears in place of the operating frequency. However,  
you can still display the operating frequency, if desired.  
To display the frequency rather than Memory name,  
access Menu No. 15 (MDF) and select “FRQ”. This  
menu toggles the display mode between the Memory  
name (“MN”) and frequency display (“FRQ”).  
Note:  
◆
You cannot name the Call Channel {page 53}.  
◆
You cannot assign a Memory name to a channel that does not  
contain data.  
◆
◆
You can overwrite stored names by repeating steps 1 to 7.  
The stored name is erased when you clear the Memory channel  
data.  
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MEMORY CHANNEL TRANSFER  
Memory \ VFO Transfer  
After retrieving frequencies and associated data from  
Memory Recall Mode, you can copy the data to the  
VFO. This function is useful, for example, when the  
frequency you want to monitor is near the frequency  
stored in a memory channel.  
1 Press [MR], then turn the Tuning control to recall a  
desired memory channel.  
2 Press [F], [VFO] to copy the memory channel data  
to the VFO.  
Note:  
◆
To copy an odd-split channel data {page 45}, turn the Reverse  
function ON {page 38} before performing the transfer.  
◆
You can also transfer the Program Scan memory channels (L0/U0  
~ L2/U2), the Priority Channel (Pr) and Weather Alert (AL)  
frequency (TH-K2AT K/ K2 only) to the VFO.  
Channel \ Channel Transfer  
You can copy channel information from one memory  
channel to another. This function is useful when storing  
frequencies and associated data that you temporarily  
change in Memory Recall Mode.  
1 Press [MR], then turn the Tuning control to recall a  
desired memory channel.  
2 Press [F], [MR].  
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3 Select the memory channel where you would like the  
data copied, using the Tuning control.  
4 Press [MR].  
The tables below illustrate how data is transferred  
between memory channels.  
Channel 0 ~ 99  
Reception frequency  
Transmission frequency  
Tone frequency  
a
a
a
a
a
a
a
Channel 0 ~ 99  
Reception frequency  
Transmission frequency  
Tone frequency  
Offset direction  
Offset direction  
CTCSS frequency  
DCS code  
CTCSS frequency  
DCS code  
Tone/ CTCSS/ DCS  
ON/ OFF status  
Tone/ CTCSS/ DCS  
ON/ OFF status  
a
Offset frequency  
Reverse ON  
Offset frequency  
Reverse ON  
a
a
a
a
Frequency step size  
Memory channel name1  
Frequency step size  
Memory channel name1  
Memory Channel  
Lockout ON/ OFF  
Memory Channel  
Lockout ON/ OFF  
a
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Channel 0 ~ 99  
Reception frequency  
Transmission frequency  
Tone frequency  
a
a
a
a
a
a
a
L0/U0 ~ L2/U2, Pr, AL1  
Reception frequency  
Transmission frequency  
Tone frequency  
Offset direction  
Offset direction  
CTCSS frequency  
DCS code  
CTCSS frequency  
DCS code  
Tone/ CTCSS/ DCS  
ON/ OFF status  
Tone/ CTCSS/ DCS  
ON/ OFF status  
a
Offset frequency  
Reverse ON  
Offset frequency  
Reverse ON  
a
a
a
a
Frequency step size  
Memory channel name2  
Frequency step size  
Memory channel name2  
Memory Channel  
Lockout ON  
Memory Channel  
Lockout OFF  
a
1
2
TH-K2AT K/ K2 only  
When “50” is selected in Menu No.13 (M.CH).  
Note: When transferring an odd-split channel, the Reverse status,  
Offset direction and Offset frequency are not transferred {pages 32,  
33, 38}.  
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CALL CHANNEL  
The Call Channel can be recalled instantly no matter  
what frequency the transceiver is operating on. For  
instance, you may use the Call Channel as an  
emergency channel within your group. In this case, Call  
Scan {page 64} will be useful.  
The default Call Channel frequencies are 144.000 MHz  
for the 2 m band (all TH-K2 models), and 430.000 MHz  
(all TH-K4 models) for the 70 cm band.  
Note: Unlike memory channels 0 to 99, the Call Channel cannot be  
cleared.  
Recalling the Call Channel  
1 Press [CALL] to recall the Call Channel.  
•
•
The Call Channel frequency and “C” appear.  
To return to the previous frequency, press [CALL]  
again.  
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Reprogramming the Call Channel  
1 Select your desired frequency and related data  
(Tone, CTCSS, DCS, or offset direction, etc.).  
•
When you program the Call Channel as an odd-split  
channel, select a reception frequency first.  
2 Press [F], [CALL].  
•
The selected frequency and related data are stored in  
the Call Channel.  
To also store a separate transmit frequency, continue  
with the following steps.  
3 Select the desired transmission frequency.  
4 Press [F].  
5 Press [PTT]+[CALL].  
•
The separate transmission frequency is stored in the  
Call Channel.  
Note:  
◆
When you recall an odd-split Call Channel, “+” and “–” appear on  
the display.  
◆
Transmit offset status and Reverse status are not stored in an  
odd-split Call Channel.  
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WEATHER ALERT (TH-K2AT K/ K2 ONLY)  
One of the NOAA Weather Radio channels can be  
programmed to the AL memory channel of the TH-K2AT.  
The transceiver can be configured to check the NOAA  
Weather Alert tone (1050 Hz) and will automatically alert  
you by recalling and monitoring the Weather Radio  
frequency when the Weather Alert tone is broadcasted.  
Programming the Weather Radio Frequency  
The transceiver is preprogrammed to 162.550 MHz  
(WX1). You can store a different frequency to the AL  
channel to use this function. Refer to the NOAA  
channel frequency directory for your local Weather  
Radio frequency before you use the Weather Alert  
function. The latest Weather Radio information can be  
obtained from http://www.nws.noaa.gov/nwr/.  
1 Press [VFO].  
2 Select your local NOAA Weather Radio frequency  
using the Tuning control or keypad.  
3 Press [F], [MR].  
4 Turn the Tuning control to select memory channel  
“AL” (Alert).  
5 Press [MR].  
•
A long beep sounds and the new NOAA Weather  
Radio frequency is stored to memory channel “AL”.  
Weather Radio Frequencies (MHz)  
WX1  
WX2  
WX3  
WX4  
WX5  
WX6  
WX7  
WX8  
162.550 162.400 162.475 162.425 162.450 162.500 162.525 163.275  
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Note:  
◆
◆
◆
When you perform Full Reset {page 111}, the Weather Radio  
frequency recovers the factory default frequency (162.550 MHz).  
When you clear the Weather Radio channel {page 47}, the  
factory default frequency (162.550 MHz) will not be recovered.  
You can also transfer the AL memory channel data to the VFO or  
another memory channel.  
Enabling a Weather Alert  
You can monitor the Weather Radio frequency  
continuously or in the background while receiving on  
another frequency.  
To monitor the Weather Radio frequency continuously:  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 37  
(WXA).  
3 Press [MENU] and turn the Tuning control to select  
“ON”.  
4 Press [MENU] to store the setting.  
•
The frequency automatically changes to the Weather  
Radio frequency.  
•
•
“WX” appears on the LCD and the transceiver mutes.  
The Tone, CTCSS and DCS functions cannot be  
configured to the AL channel.  
•
When the Weather Alert tone is broadcasted, a morse  
code “WX” sounds from speaker and the transceiver  
unmutes.  
5 To exit the Weather Alert mode, press [MENU],  
select Menu No. 37 (WXA), and set it to “OFF”.  
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If you want to monitor another frequency while  
monitoring the Weather Radio in the background:  
1 Perform step 1 ~ 4 above.  
2 Press [VFO] or [MR] and turn the Tuning control to  
select another frequency or memory channel.  
•
“WX” remains on the LCD.  
3 When the Weather Alert tone is broadcasted, the  
transceiver automatically switches to the Weather  
Radio frequency.  
4 To exit the Weather Alert Mode, press [MENU],  
select Menu No. 37 (WXA), and set it to “OFF”.  
Note:  
◆
The transceiver checks the weather alert tone every 1 second  
while you are monitoring another frequency or channel.  
◆
If the transceiver is transmitting or receiving a signal on another  
frequency, Weather Alert function temporarily pauses.  
CHANNEL DISPLAY  
While in this mode, the transceiver displays only  
memory channel numbers (or Memory names if they  
have been stored), instead of frequencies.  
1 Press [PTT]+[MR]+[ ] (POWER).  
•
The transceiver displays the memory channel number  
in place of the operating frequencies.  
2 Turn the Tuning control to select your desired  
memory channel number.  
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While in Channel Display Mode, only the following keys  
can be operated.  
[KEY]  
1
PTT  
MR  
LAMP  
MONI/SQL  
F
#
CALL Tuning control  
1 TH-K2AT/ ET/ K4AT only  
[F] then  
PTT  
LAMP1  
MONI/SQL  
MENU  
F
1
The light stays ON until [F], [LAMP] is pressed again {page 88}.  
[KEY] (1 s)  
F
MR  
CALL  
While transmitting:  
LAMP MENU CALL1 Tuning control2  
1
2
1750 Hz tone is transmitted (TH-K2E/ K4E) {page 36}. DTMF D tone  
is transmitted (TH-K2AT/ ET/ K4AT) {page 76}.  
DTMF keypad, [0] ~ [9], [ ], [#], and [F] (A tone) ~ [CALL] (D tone)  
also works (TH-K2AT/ ET/ K4AT only) {page 76}.  
To recover normal operation, turn the transceiver OFF  
and press [PTT]+[MR]+[ ] (POWER) again.  
Note:  
◆
To enter the Channel Display Mode, you must have at least one  
memory channel that contains the data.  
◆
If the memory channel contains the Memory name data, the  
Memory name is displayed in place of the “CH” characters.  
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SCAN  
Scan is a useful function for hands-off monitoring of  
your favorite frequencies. By becoming comfortable  
with all types of scan, you will increase your operating  
efficiency.  
This transceiver provides the following types of scans.  
Scan Type  
Purpose  
Scans the entire band of the  
frequency you selected.  
Band Scan  
Normal  
Scan  
Scans the specified frequency  
ranges stored in Memory  
channels L0/U0 ~ L2/U2.  
Program  
Scan  
Memory All-Channel Scans all Memory channels  
Scan  
Scan  
from 0 to 99 (or from 0 to 49).  
Scans the Call channel and  
the current VFO frequency.  
VFO  
Call  
Scan  
Memory Scans the Call channel and  
Channel the selected Memory channel.  
Checks the activities on the  
Priority channel (Pr) every  
3 seconds.  
Priority Scan  
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Note:  
◆
When the CTCSS or DCS function is activated, the transceiver  
stops at a busy frequency and decodes the CTCSS tone or DCS  
code. If the tone or code matches, the transceiver unmutes.  
Otherwise, it resumes scanning.  
◆
◆
Press and hold [MONI/SQL] to pause scan in order to monitor  
the scanning frequency. Release [MONI/SQL] to resume  
scanning.  
While the transceiver is in VOX Mode or transmitting, it causes  
scan to stop (excluding Priority Scan).  
◆
◆
Pressing [MENU] causes scan to stop.  
Starting scan switches OFF the Automatic Simplex Check (ASC)  
{page 38}.  
◆
If you press any key other than the following keys during scan,  
the transceiver exits scan (excluding Priority Scan). Priority Scan  
stops while “Pr” is blinking: [F], [F] (1 s), [LAMP], [MONI/SQL],  
Tuning control, and [F] then [MONI/SQL].  
NORMAL SCAN  
When you are operating the transceiver in VFO Mode,  
2 types of scanning are available: Band Scan and  
Program Scan.  
Band Scan  
The transceiver scans the entire band of the frequency  
you selected. For example, if you are operating and  
receiving at 144.525 MHz, it scans all the frequencies  
available for the 2 m band. (Refer to receiver VFO  
frequency range in the specifications {page 122}.) When  
the current VFO receive frequency is outside the Program  
Scan frequency range {page 59}, the transceiver scans  
the entire frequency range available for the current VFO.  
1 Press [VFO].  
2 Turn the Tuning control to select the frequency  
outside of the Program Scan frequency range.  
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3 Press [VFO] (1 s) to start Band Scan.  
4 To stop Band Scan, press [VFO] or [PTT].  
Note:  
◆
◆
◆
◆
While scanning, you can change the scan frequency direction by  
turning the Tuning control.  
The transceiver scans the frequency range that is stored in Menu  
No. 7 (P.VFO) {page 93}.  
If you select a frequency within the L0/U0 ~ L2/U2 range in step 3,  
Program Scan {page 61} starts.  
If you press [MONI/SQL], Band Scan temporarily pauses.  
Release [MONI/SQL] to resume scanning.  
Program Scan  
You can limit the scanning frequency range. There are  
3 memory channel pairs (L0/U0 ~ L2/U2) available for  
specifying the start and end frequencies. Program Scan  
monitors the range between the start and end  
frequencies that you have stored in these memory  
channels. Before performing Program Scan, store the  
Program Scan frequency range to one of the memory  
channel pairs (L0/U0 ~ L2/U2).  
■ Storing a Program Scan Frequency Range  
1 Press [VFO].  
2 Turn the Tuning control to select your desired  
start frequency.  
3 Press [F], [MR] then turn the Tuning control to  
select a memory channel from L0 ~ L2.  
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4 Press [MR] to store the start frequency in the  
memory channel.  
5 Turn the Tuning control to select your desired  
end frequency.  
6 Press [F], [MR] then turn the Tuning control to  
select a channel from U0 ~ U2, corresponding to  
the channel selected in step 4.  
•
For example, if you selected L0 in step 4, select U0  
for the end frequency.  
7 Press [MR] to store the end frequency in the  
memory channel.  
■ Performing Program Scan  
1 Press [VFO].  
2 Turn the Tuning control to select a frequency  
within the frequency range of memory channel  
L0/U0 ~ L2/U2.  
3 Press [VFO] (1 s) to start Program Scan.  
4 To stop Program Scan, press [VFO] or [PTT].  
Note:  
◆
If you press [MONI/SQL], Program Scan temporarily pauses.  
Release [MONI/SQL] to resume scanning.  
◆
◆
The transceiver stops scanning when it detects a signal.  
If more than 2 Program Scan channel pairs are stored and  
overlaps the frequency range among the pairs, the smaller  
Program Scan memory channel number has priority.  
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◆
To perform Program Scan, the “L” channel must be lower  
than the “U” channel. Otherwise, Band Scan starts {page  
60}.  
MEMORY SCAN  
Memory Scan monitors memory channels in which you  
have stored frequencies.  
All-Channel Scan  
The transceiver scans all of the memory channels in  
which you have stored frequencies.  
1 Press [MR] (1 s).  
•
Scan starts from the last memory channel number and  
ascends up through the channel numbers (default).  
Turn the Tuning control to change the scanning  
direction.  
2 To stop All-Channel Scan, press [MR] or [PTT].  
Note:  
◆
You must have 2 or more memory channels that contain data,  
excluding special function memory channels (L0/U0 ~ L2/U2, Pr,  
and AL).  
◆
You can perform All-Channel Scan in Channel Display Mode  
{page 57}.  
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CALL SCAN  
You can alternate between monitoring the Call Channel  
and the current operating frequency.  
1 Select the frequency (in VFO or Memory Recall  
Mode) you want to monitor.  
•
•
In VFO Mode, turn the Tuning control to select the  
desired frequency.  
In Memory Recall Mode, turn the Tuning control to  
select the memory channel you want to monitor.  
2 Press [CALL] (1 s) to start the Call Scan.  
3 The Call Channel and the selected VFO frequency or  
memory channel are monitored.  
4 To stop Call Scan, press [PTT] or [CALL].  
Note:  
◆
You must configure the CALL key function to “CALL” (Menu No.  
18) prior to using Call Scan. Otherwise, a 1750 Hz tone will be  
transmitted.  
◆
◆
The transceiver stops scanning when it detects a signal.  
You can perform Call Scan even if the recalled memory channel  
has been locked out {page 67}.  
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PRIORITY SCAN  
You may sometimes want to check your favorite  
frequency activities while monitoring other frequencies.  
In this case, use the Priority Scan function. Priority  
Scan checks the activities of the Priority Channel every  
3 seconds. If the transceiver detects a signal on the  
Priority Channel, it recalls the frequency.  
Note: If you do not operate any control or key for 3 seconds after the  
signal drops, the transceiver returns to the original frequency and  
resumes Priority Scan.  
Programming Priority Channels  
1 Press [VFO].  
2 Turn the Tuning control to select your desired  
Priority Channel frequency.  
3 Select selective call functions, if necessary.  
4 Press [F], [MR].  
•
The memory channel number appears and blinks.  
5 Turn the Tuning control to select “Pr”.  
6 Press [MR] to store the data on the Priority Channel.  
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Using Priority Scan  
1 Press [MENU] and turn the Tuning control to select  
Menu No. 10 (PRI).  
2 Press [MENU] and turn the Tuning control to select  
“ON”.  
3 Press [MENU] to store the setting.  
•
“PRI” appears.  
4 Press any key other than [PTT], [LAMP], and  
[MONI/SQL] to exit Menu Mode.  
•
•
The transceiver checks for a signal on the Priority  
Channel every 3 seconds.  
When the transceiver detects a signal on the Priority  
Channel, “Pr” blinks and the frequency changes to the  
Priority Channel.  
•
If you do not operate any control or key for 3 seconds  
after the signal drops, the transceiver returns to the  
original frequency and resumes Priority Scan.  
5 To quit Priority Scan, select “OFF” in step 2.  
•
You can also press any key other than [PTT], [F],  
[LAMP], [MONI/SQL], [F] then [MONI/SQL] and  
[F] (1 s) to exit Priority Scan while “Pr” is blinking.  
Note:  
◆
If a signal is received on a Priority Channel with a CTCSS or  
DCS code programmed, the Priority Channel is recalled only  
when the programmed tone/ code matches.  
◆
Press and hold [MONI/SQL] to pause Priority Scan when the  
transceiver is not displaying the Priority Channel. Release  
[MONI/SQL] to resume Priority Scan.  
◆
◆
If you clear the Priority Channels {page 47}, Priority Scan stops.  
If you press any key other than the following keys while “Pr” is  
blinking, the transceiver exits Priority Scan: [LAMP],  
[MONI/SQL], [F] (1 s), [F] then [MONI/SQL] (Squelch  
adjustment) and [PTT].  
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MEMORY CHANNEL LOCKOUT  
You can lock out memory channels that you prefer not  
to monitor during All-Channel Memory Scan {page 63}.  
1 Press [MR] to enter Memory Recall Mode.  
2 Turn the Tuning control to select the memory  
channel to be locked out.  
3 Press [MENU].  
4 Turn the Tuning control and select Menu No. 12  
(L.OUT).  
5 Press [MENU] and turn the Tuning control to select  
“ON”.  
Memory channel number  
6 Press [MENU] to store the setting.  
7 Press any key other than [LAMP] and [MONI/SQL]  
to exit the Menu Mode.  
•
A “ ” icon appears below the memory channel  
number, indicating the channel is locked out.  
8 To unlock the memory channel, repeat steps 1 ~ 7,  
selecting “OFF” in step 5.  
•
The “ ” icon disappears.  
Note:  
◆
The Program Scan memories (L0/U0 ~ L2/U2), Priority Channel  
(Pr) and Weather Radio frequency (AL) cannot be locked out.  
◆
Even if a memory channel is locked out, you can perform Call Scan  
{page 64} between the Call Channel and the memory channel.  
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SCAN RESUME METHOD  
The transceiver stops scanning at the frequency (or  
memory channel) where a signal is detected. It then  
continues or stops scanning according to which Resume  
Mode you have selected.  
•
Time-Operated Mode (default)  
The transceiver remains on a busy frequency (or  
memory channel) for approximately 5 seconds, then  
continues to scan even if the signal is still present.  
•
Carrier-Operated Mode  
The transceiver remains on a busy frequency (or  
memory channel) until the signal drops out. There is  
a 2-second delay between signal dropout and scan  
resumption.  
•
Seek Mode  
The transceiver moves to a frequency or memory  
channel where a signal is present and stops.  
To change the scan resume method:  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 11 (SCAN).  
3 Press [MENU].  
4 Turn the Tuning control to select “TO” (Time-Operated),  
“CO” (Carrier-Operated), or “SE” (Seek) Mode.  
5 Press [MENU] to store the new setting. Otherwise,  
press [PTT] to cancel.  
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SELECTIVE CALL  
CTCSS AND DCS  
You may sometimes want to hear calls from only  
specific persons or groups. In this case, use the  
Selective Call. This transceiver is equipped with  
CTCSS (Continuous Tone Coded Squelch System) and  
DCS (Digital Coded Squelch). These Selective Calls  
allow you to ignore (not hear) unwanted calls from other  
persons who are using the same frequency. The  
transceiver unmutes only when it receives a signal  
having the same CTCSS tone or DCS code.  
Note: CTCSS and DCS do not cause your conversation to be  
private or scrambled. It only relieves you from listening to unwanted  
conversations.  
CTCSS  
A CTCSS tone is a sub-audible tone and is selectable  
from among the 42 tone frequencies listed in the table  
on the page 71. The list includes 37 EIA standard tones  
and 5 non-standard tones.  
Using CTCSS  
1 Press [MENU] and turn the Tuning control to select  
Menu No. 2 (T.CT.DCS).  
2 Press [MENU] and turn the Tuning control to select  
“CTCSS”.  
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•
As you turn the Tuning control, the selection cycles as  
follows: “OFF” ➞ “TONE” ➞ “CTCSS” ➞ “DCS” ➞ “OFF”.  
3 Press [MENU].  
•
“CT” appears on the upper part of display, indicating  
that the CTCSS function is activated.  
4 Press any key other than [MENU], [MONI/SQL], and  
[LAMP] to exit Menu Mode.  
When CTCSS is ON, you will hear calls only when the  
selected CTCSS tone is received. To answer the call,  
press and hold [PTT], then speak into the microphone.  
Note:  
◆
◆
◆
You cannot use the CTCSS and Tone/ DCS functions  
simultaneously. Switching the CTCSS function ON after having  
activated the Tone/ DCS functions deactivates the Tone/ DCS  
functions.  
If you select a high CTCSS frequency, receiving audio or noise  
that contains the same frequency portions may cause CTCSS to  
function incorrectly. To prevent noise from causing this problem,  
select an appropriate squelch level {page 18}.  
While transmitting the 1750 Hz tone by pressing [CALL]  
{page 35}, the transceiver does not transmit the CTCSS tone.  
Selecting a CTCSS Frequency  
1 Press [MENU] and turn the Tuning control to select  
Menu No. 4 (CT).  
•
The current CTCSS frequency appears.  
2 Press [MENU] and turn the Tuning control to select  
your desired CTCSS frequency.  
•
The selectable CTCSS frequencies are the same as  
those for the Tone frequency. Refer to the table on the  
following page for the available CTCSS frequencies.  
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3 Press [MENU] to store the new setting or [PTT] to  
cancel.  
Note: To use the selected CTCSS tone, you must turn the CTCSS  
function ON {page 69}.  
Available CTCSS Tone Frequencies  
Tone Frequency (Hz)  
67.0 82.5 100.0 123.0 151.4 186.2 225.7  
69.3 85.4 103.5 127.3 156.7 192.8 229.1  
71.9 88.5 107.2 131.8 162.2 203.5 233.6  
74.4 91.5 110.9 136.5 167.9 206.5 241.8  
77.0 94.8 114.8 141.3 173.8 210.7 250.3  
79.7 97.4 118.8 146.2 179.9 218.1 254.1  
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CTCSS Freq. ID Scan  
This function scans through all CTCSS frequencies to  
identify the incoming CTCSS frequency on the received  
signal. You may find this useful when you cannot recall  
the CTCSS frequency that the other persons in your  
group are using.  
1 Press [MENU] and turn the Tuning control to select  
Menu No. 4 (CT).  
2 Press [MENU] (1 s) to start the CTCSS Freq. ID  
Scan.  
•
While scanning, the decimal point of CTCSS frequency  
blinks.  
•
•
•
To reverse the scan direction, turn the Tuning control.  
To quit the function, press [PTT].  
When a CTCSS frequency is identified, the identified  
frequency appears and blinks.  
3 Press [MENU] to program the identified frequency in  
place of the current CTCSS frequency. Otherwise,  
press [PTT] to exit the CTCSS FREQ. ID Scan.  
•
Turn the Tuning control while the identified frequency  
is blinking to resume scanning.  
Note:  
◆
Received signals are monitored through the speaker while  
scanning is in progress.  
◆
CTCSS Freq. ID Scan does not scan the tone if a signal is not  
detected.  
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DCS  
DCS is similar to CTCSS. However, instead of using an  
analog audio tone, it uses a continuous sub-audible  
digital waveform that represents a 3-digit octal number.  
You can select a DCS code from among the 104 DCS  
codes listed in the table on the next page.  
Using DCS  
1 Press [MENU] and turn the Tuning control to select  
Menu No. 2 (T.CT.DCS).  
2 Press [MENU] and turn the Tuning control to select  
“DCS”.  
•
As you turn the Tuning control, the selection cycles as  
follows: “OFF” ➞ “TONE” ➞ “CTCSS” ➞ “DCS” ➞ “OFF”.  
3 Press [MENU].  
•
“DCS” appears on the display, indicating that the DCS  
function is activated.  
4 Press any key other than [MENU], [MONI/SQL], and  
[LAMP] to exit the Menu Mode.  
When DCS is ON, you will hear calls only when the  
selected DCS code is received. To answer the call, press  
and hold [PTT], then speak into the microphone.  
Note: You cannot use the DCS function and CTCSS/ Tone functions  
simultaneously. Switching the DCS function ON after having  
activated the CTCSS/ Tone functions deactivate the CTCSS/ Tone  
functions.  
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Selecting a DCS Code  
1 While in DCS Mode, press [MENU] and turn the  
Tuning control to select Menu No. 5 (DCS).  
•
The current DCS code appears.  
2 Press [MENU] and turn the Tuning control to select  
your desired DCS code.  
•
The available DCS codes are shown in the following  
table.  
023 065 132 205 255 331 413 465 612 731  
025 071 134 212 261 332 423 466 624 732  
026 072 143 223 263 343 431 503 627 734  
031 073 145 225 265 346 432 506 631 743  
032 074 152 226 266 351 445 516 632 754  
036 114 155 243 271 356 446 523 654  
043 115 156 244 274 364 452 526 662  
047 116 162 245 306 365 454 532 664  
051 122 165 246 311 371 455 546 703  
053 125 172 251 315 411 462 565 712  
054 131 174 252 325 412 464 606 723  
3 Press [MENU] to store the new code or [PTT] to  
cancel.  
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DCS Code ID Scan  
This function scans through all DCS codes to identify  
the incoming DCS code on the received signal. You  
may find this useful when you cannot recall the DCS  
code that the other persons in your group are using.  
1 Press [MENU] and turn the Tuning control to select  
Menu No. 5 (DCS).  
2 Press [MENU] (1 s) to start the DCS Code ID Scan  
function.  
•
While scanning, the decimal point between “DCS” and  
the DCS code blinks.  
•
•
•
To reverse the scan direction, turn the Tuning control.  
To quit the function, press [PTT].  
When a DCS code is identified, the identified DCS  
code appears and blinks.  
3 Press [MENU] to program the identified DCS code in  
place of the current DCS code. Otherwise, press  
[PTT] to exit the DCS Code ID Scan.  
•
Turn the Tuning control while the identified DCS code  
is blinking to resume scanning.  
Note:  
◆
Received signals are monitored through the speaker while  
scanning is in progress.  
◆
DCS Code ID Scan does not scan the code if a signal is not  
detected.  
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DTMF FUNCTIONS  
This transceiver provides you with 10 dedicated DTMF  
memory channels. You can store a DTMF number (16  
digits max.) in each of these channel to recall later for  
speed dialing.  
Many repeaters in the U.S.A. and Canada offer a  
service called Autopatch. You can access the public  
telephone network via such a repeater by sending  
DTMF tones. For further information, consult your local  
repeater reference.  
MANUAL DIALING (TH-K2AT/ ET/ K4AT ONLY)  
The numeric keypad functions as a DTMF keypad; the  
12 keys found on a touch-tone phone plus 4 additional  
keys (A, B, C, D) on the rightmost column.  
To perform Manual Dialing, follow the steps below.  
1 Press and hold [PTT] to transmit.  
2 While transmitting, press the keys in sequence on  
the keypad, to send the DTMF tones.  
•
The corresponding DTMF tones are transmitted and  
monitored through the speaker.  
Freq.  
1209  
1336  
1477  
1633  
(Hz)  
697  
770  
852  
941  
1
4
7
2
5
8
0
3
6
9
#
A
B
C
D
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•
When DTMF TX Hold is activated {page 77}, you do  
not need to continuously press [PTT] to remain in  
Transmission Mode. However, Transmission Mode is  
retained for only 2 seconds after pressing a key, so if  
the next key is not pressed within this time limit, the  
transceiver stops transmitting.  
DTMF TX Hold (TH-K2AT/ ET/ K4AT only)  
This function causes the transceiver to remain in  
Transmission Mode for 2 seconds after you release  
each key. So, you can release [PTT] while sending the  
DTMF tones.  
1 Press [MENU] to enter Menu Mode.  
2 Turn the Tuning control to select Menu No. 34  
(DT.H).  
3 Press [MENU] and turn the Tuning control to select  
“ON”.  
4 Press [MENU] to store the setting or [PTT] to cancel.  
AUTOMATIC DIALER  
If you use the 10 dedicated memory channels to store  
DTMF numbers, you do not need to remember a long  
string of digits.  
Storing a DTMF Number in Memory  
1 Press [MENU] to enter Menu Mode.  
2 Turn the Tuning control to select Menu No. 32  
(DTMF.MR).  
3 Press [MENU].  
4 Turn the Tuning control to select your desired DTMF  
memory channel number from 0 to 9.  
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5 Press [MENU].  
•
The DTMF code entry display appears and the last  
digit blinks.  
6 Turn the Tuning control to select a DTMF code.  
•
Press [MONI/SQL] to delete the character at the  
current cursor position.  
•
On the transceiver display, DTMF code “ ” is  
represented by “E” and “#” is represented by “F”  
(TH-K2AT/ ET/ K4AT only).  
•
You can also enter a DTMF code using the keypad.  
Simply press your desired DTMF codes on the keypad  
(TH-K2AT/ ET/ K4AT only).  
7 Press [MENU] to select the DTMF code and move  
the cursor to the next digit.  
8 Repeat steps 6 and 7 to enter up to 16 digits.  
9 To complete the entry, press [MENU] without  
selecting a DTMF code.  
To confirm the stored DTMF number, perform steps 1 to  
4 then press [MONI/SQL]. The programmed DTMF  
code scrolls through the display without transmitting.  
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Transmitting a Stored DTMF Number  
1 While pressing and holding [PTT], press [MENU].  
2 Release [MENU] (continue pressing [PTT]), then  
turn the Tuning control to select the desired DTMF  
memory channel number.  
3 While still holding [PTT], press [MENU] again to  
transmit the selected DTMF tones.  
•
The number stored in the channel scrolls across the  
display, accompanied by DTMF tones from the  
speaker.  
•
After transmission, the frequency display is restored.  
TH-K2AT/ ET/ K4AT only: If you do not need to confirm the  
memory channel contents, press [0] ~ [9] instead of turning  
the Tuning control in step 2, to select a channel number. The  
stored DTMF number will be immediately transmitted. (You  
do not have to press [MENU] in step 3.)  
Note: If you select an empty DTMF memory channel and press  
[MENU], the frequency display is restored.  
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Adjusting the DTMF Tone Transmission Speed  
This transceiver allows you to configure the DTMF  
number transmission speed between Fast (default) and  
Slow. If a repeater cannot respond to the fast speed,  
adjust this parameter.  
1 Press [MENU] to enter Menu Mode.  
2 Turn the Tuning control to select Menu No. 33  
(SPD).  
3 Press [MENU].  
4 Turn the Tuning control to select “FA” (Fast) or “SL”  
(Slow).  
•
The tone duration of FAST is 50 ms and SLOW is  
100 ms. “FA” (Fast) is the default setting.  
5 Press [MENU] to store the setting or [PTT] to cancel.  
Adjusting the Pause Duration  
You can change the pause duration (a space digit)  
stored in memory channels. The default setting is  
500 miliseconds.  
1 Press [MENU] to enter Menu Mode.  
2 Turn the Tuning control to select Menu No. 35 (PA).  
3 Press [MENU].  
4 Turn the Tuning control to select 100, 250,  
500 (default), 750, 1000, 1500, 2000 ms.  
5 Press [MENU] to store the setting. Otherwise, press  
[PTT] to cancel.  
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DTMF KEY LOCK  
Assuming you have a transceiver with the optional  
speaker microphone installed and you are carrying it in  
the holder or bag, you sometimes may want to disable  
the keypad to avoid accidental DTMF transmission. In  
this case, turn the DTMF Key Lock function ON.  
1 Press [MENU] to enter Menu Mode.  
2 Turn the Tuning control to select Menu No. 36  
(DT.L).  
3 Press [MENU].  
4 Turn the Tuning control to select “ON”.  
5 Press [MENU] to store the setting or [PTT] to cancel.  
When this function is activated, you cannot send DTMF  
tones using [MENU] (all models) or DTMF keypad  
(TH-K2AT/ ET/ K4AT) during transmission.  
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OPERATOR CONVENIENCES  
APO (AUTO POWER OFF)  
The transceiver switches OFF automatically if no keys  
or controls are pressed or adjusted for 30 minutes  
(default). One minute before the transceiver switches  
OFF, warning beeps sound for a few seconds and  
“APO” blinks.  
You can select the APO time from OFF (disable), 30  
(default), 60, 90, 120, or 180 minutes.  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 17  
(APO).  
3 Press [MENU].  
4 Turn the Tuning control to select the APO time from  
OFF, 30, 60, 90, 120 or 180 minutes.  
5 Press [MENU] to store the setting. Otherwise, press  
[PTT] to cancel.  
Note:  
◆
◆
APO does not function while the transceiver is scanning.  
The APO timer starts counting down the time when no key  
presses, no control adjustments, and no PC control command  
(SP/MIC jack) sequences are detected.  
◆
◆
The APO warning beep sounds and “APO” appears 1 minute  
before the transceiver turns OFF.  
The APO warning beep sounds even if Menu No. 27 (BP)  
{page 85} is set to “OFF”.  
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BATTERY LIFE  
Before you operate the transceiver outside using a  
battery pack, it is important to know how long the  
battery pack will last. The operating times listed in the  
table below are measured under the following cyclic  
conditions:  
TX: 6 seconds, RX: 6 seconds, Stand-by: 48 seconds  
We recommend you carry extra battery packs with you,  
in case the battery pack becomes discharged.  
Operating Time/  
Hours (Approx.)  
Battery  
Type  
Output  
Power  
TH-K2AT/ E/ ET  
TH-K4AT/ E  
5.0  
H
M
L
5.5  
8.5  
PB-43N  
(7.2 V)  
7.5  
11.0  
4.0  
10.0  
3.0  
H
M
L
BT-14  
(9.0 V)  
8.0  
7.0  
10.5  
9.5  
REMAINING BATTERY CAPACITY  
You can confirm the remaining battery capacity when  
you transmit in low power.  
To check the remaining capacity:  
1 Press [F], [PTT] until “ ” appears.  
2 Press and hold [PTT].  
•
The bar-graph shows the remaining battery capacity.  
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: High battery power  
: Medium battery power  
: Low battery power  
No display  
: Recharge or replace the batteries.  
3 Release [PTT] to exit.  
Note: You may not be able to transmit at high power (“ ” position) if  
the battery remaining indicator shows low battery power.  
BATTERY SAVER  
The Battery Saver extends the operating time of the  
transceiver. It automatically activates when the  
squelch is closed and no key is pressed for more than  
10 seconds. To reduce battery consumption, this  
function shuts the receiver circuit OFF for the  
programmed time, then momentarily turn it back ON to  
detect a signal.  
To program the receiver shut-off period for the battery  
saver:  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 16 (SAV).  
3 Press [MENU].  
4 Turn the Tuning control to select the receiver shut-  
off period from OFF, 0.2, 0.4, 0.6, 0.8, 1.0 (default),  
2.0, 3.0, 4.0, and 5.0 seconds.  
5 Press [MENU] to store the setting or [PTT] to cancel.  
Note:  
◆
The longer the shut-off period, the more you can save on battery  
consumption. However, there is a greater chance of missing a  
signal.  
◆
When the CTCSS/ DCS code matches during reception, the  
battery saver function is turned OFF.  
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◆
◆
While the transceiver is communicating in PC Mode {page107},  
the Battery Saver does not function.  
Battery Saver does not function while scanning.  
BEAT SHIFT  
Since the transceiver uses a microprocessor to control  
various functions of the transceiver, the CPU clock  
oscillator’s harmonics or image may appear on some  
spots of the reception frequencies {page 121}. In this  
case, turn the Beat Shift function ON.  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 28 (BS).  
3 Press [MENU].  
4 Turn the Tuning control to select “ON”.  
5 Press [MENU] to store the setting or [PTT] to cancel.  
Note: Beat Shift status can be stored to each Memory channel.  
BEEP FUNCTION  
The Beep function provides confirmation of entry, error  
status, and malfunctions of the transceiver. We  
recommend you leave this function ON in order to detect  
erroneous operations and malfunctions.  
However, to turn the beep function OFF:  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 27 (BP).  
3 Press [MENU].  
4 Turn the Tuning control to select “OFF”.  
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5 Press [MENU] to store the setting or [PTT] to cancel.  
The transceiver generates the following warning beeps  
even if the beep function is turned OFF.  
•
•
•
•
APO warning beeps {page 82}  
DC voltage error beep {page 115}  
Weather Alert beep {page 55}  
Time-Out Timer warning beep {page 94}  
Note: The beep output level is linked to the VOL control position.  
BUSY CHANNEL LOCKOUT  
This function is used in order to prevent transmitting on  
a channel or frequency that somebody else is currently  
using. When turned ON, an error beep sounds and you  
cannot transmit even if you press [PTT].  
1 Press [MENU] and turn the Tuning control to select  
Menu No. 24 (BCL).  
2 Press [MENU] and turn the Tuning control to select  
“ON” or “OFF” (default).  
3 Press [MENU] to store the setting or [PTT] to cancel.  
FREQUENCY STEP SIZE  
Choosing the correct frequency step size is essential in  
order to select your exact receive frequency using the  
Tuning control. You can select your desired frequency  
step size from:  
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5 kHz, 6.25 kHz, 10 kHz, 12.5 kHz, 15 kHz, 20 kHz,  
25 kHz, 30 kHz, 50 kHz, 100 kHz.  
To change the frequency step size:  
1 Press [MENU] and turn the Tuning control to select  
Menu No. 1 (STP).  
•
The current frequency step size appears.  
2 Press [MENU] and turn the Tuning control to select  
your desired frequency step size.  
3 Press [MENU] to store the setting or [PTT] to cancel.  
Note: If you change to a frequency step size that does not match the  
current operating frequency, the transceiver automatically adjusts the  
frequency to match the new frequency step size.  
The default step size for each model is as follows.  
Freq. Step Size  
Model  
Market code  
(Default)  
K, K2  
M, M2  
E
5 kHz  
TH-K2AT  
12.5 kHz  
12.5 kHz  
12.5 kHz  
25 kHz  
TH-K2E  
TH-K2ET  
TH-K4AT  
TH-K4E  
E3  
M2  
E
25 kHz  
Note: The market code is printed on the bar-code label of the carton  
box.  
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LAMP  
To illuminate the display and keys:  
Press [LAMP].  
•
•
•
If no other key is pressed, the light turns OFF  
approximately 5 seconds after releasing [LAMP].  
Press any key (including [PTT]) other than [LAMP] while  
the display and keys are lit to restart the 5-second timer.  
Press [LAMP] while the display and keys are lit to  
immediately turn the light OFF.  
To keep the light ON continuously:  
Press [F], [LAMP].  
•
The light remains ON until you press [F], [LAMP] again.  
LOCK FUNCTION  
The lock function disables most of the keys to prevent  
you from accidentally activating a function.  
1 Press [F] (1 s).  
•
“
” appears when this function is ON.  
•
The following keys cannot be locked:  
[LAMP], [MONI/SQL], [PTT], [F] (1 s), [ ] (POWER),  
[F] then [LAMP] and [F] then [MONI/SQL].  
2 Press [F] (1 s) to unlock the keys.  
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Note:  
◆
The Tuning control is also locked. To unlock the Tuning control  
while the Lock function is ON, access Menu No. 30 (ENC)  
{below} and select “ON”.  
◆
◆
You cannot perform the Microprocessor Reset {page 111} while  
the Lock function is ON.  
Microphone PF keys {below} operate normally even if the Lock  
function is ON.  
Tuning Control Unlock  
While the Lock function is ON, you sometimes may want  
to turn the Tuning control to change the frequency. In  
this case, turn the Tuning control unlock function ON.  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 30  
(ENC).  
3 Press [MENU].  
4 Turn the Tuning control to select “ON”.  
5 Press [MENU] to store the setting or [PTT] to cancel.  
MICROPHONE PF KEYS (OPTIONAL)  
If you have an optional SMC-33 or SMC-34 speaker  
microphone, you can access many transceiver settings  
without using transceiver keys or controls. Microphone  
keys 1, 2, and 3, located on the top of the microphone,  
are programmable with transceiver functions.  
The microphone key default assignments are as follows:  
Mic [1]: VFO  
Mic [2]: MR  
Mic [3]: CALL (TH-K2AT/ K4AT)  
1750 Hz (TH-K2E/ ET/ K4E)  
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Note:  
◆
◆
◆
Turn the transceiver OFF before connecting the optional speaker  
microphone.  
While Menu No. 31 (PC) is ”ON“ {page 107} or the Lock function  
is ON {page 88}, you cannot program PF keys.  
If the LOCK switch on the rear of the microphone is ON, you  
must move the switch to the OFF position to program the keys.  
1 Press one of the following key combinations to  
reprogram the keys on the speaker microphone.  
•
•
•
Press Mic [1]+[ ] (POWER) to reprogram Mic [1].  
Press Mic [2]+[ ] (POWER) to reprogram Mic [2].  
Press Mic [3]+[ ] (POWER) to reprogram Mic [3].  
2 Press a key or the key combination you want to  
assign to the microphone key.  
[KEY]  
VFO  
[F] + [KEY]  
VFO  
Function  
VFO Transfer  
M.IN  
M
MR  
MR  
CALL  
LAMP  
CALL  
LAMP3  
C.IN/ 1750 Hz  
Lamp stays ON.  
MONI/  
SQL  
MONI/  
SQL  
Squelch adjustment  
PTT1  
PTT  
Change power setting  
Reverse  
MENU  
MENU  
Tuning2  
control  
Tuning2  
control  
Up/ Down  
1
You can press [PTT] to assign a function key to alternate VFO  
and Memory Recall Mode.  
2 Tuning control (Up or Down) can also be programmed.  
3
The light stays ON until you press [F], [LAMP] again {page 88}.  
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MONITOR  
When you are receiving while the squelch function is  
ON, weak signals may become intermittent.  
If the CTCSS or DCS function is ON, you may want to  
disable the squelch function temporarily to monitor the  
current channel activities.  
In both of these cases, use the Monitor function to  
temporarily disable the squelch function.  
To activate the Monitor function:  
1 Press and hold [MONI/SQL].  
•
The speaker is unmuted and you can monitor the  
signals.  
2 Release [MONI/SQL] to return to normal operation.  
NARROW BAND FM OPERATION  
By default, the transceiver operates in normal FM  
(±5 kHz) mode for both transmission and reception.  
You can also operate the transceiver in narrow band FM  
(±2.5 kHz).  
To operate the transceiver in narrow band FM:  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 29  
(FMN).  
3 Press [MENU].  
4 Turn the Tuning control to select “ON”.  
5 Press [MENU] to store the setting or [PTT] to cancel.  
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When narrow band FM operation is ON, “N” appears in  
the top right of the LCD.  
Note: You can store the narrow band FM operation status to the  
memory channels {page 41}.  
POWER-ON MESSAGE  
You can change the Power-ON Message (a maximum  
of 6 characters) when the transceiver is turned ON.  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 26  
(P.ON.MSG).  
3 Press [MENU].  
•
•
The current message and entry cursor appear.  
The cursor moves to the next digit.  
4 Turn the Tuning control to select a character.  
•
You can enter the following alphanumeric characters:  
0 ~ 9, A ~ Z, – (hyphen), / (slash) and a space.  
5 Press [MENU].  
•
The cursor moves to the next digit.  
6 Repeat steps 4 and 5 to enter up to 6 digits.  
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•
•
Press [MONI/SQL] to delete the character at the  
current cursor position.  
If no Power-ON Message is programmed, “TH-K2” or  
“TH-K4” appears as the Power-ON Message.  
7 To complete the entry, press [MENU] without  
selecting a character. Otherwise press [PTT] to  
cancel the entry.  
PROGRAMMABLE VFO  
If you want to limit the operating frequencies within a  
certain range, program the upper and lower frequency  
limits to the programmable VFO parameters. For  
example, if you select 144 MHz for the lower limit and  
145 MHz for the upper limit, the tunable range will be  
limited from 144.000 MHz to 145.995 MHz.  
1 Press [VFO].  
2 Press [MENU].  
3 Turn the Tuning control to select Menu No. 7  
(P.VFO).  
•
The current programmable frequency range for the  
band appears.  
4 Press [MENU].  
5 Turn the Tuning control to select the lower limit  
frequency in MHz.  
6 Press [MENU] to store the lower limit frequency. To  
cancel, press [PTT].  
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•
The upper limit frequency blinks.  
7 Turn the Tuning control to select the upper limit  
frequency in MHz.  
8 Press [MENU] to store the upper limit frequency or  
[PTT] to cancel.  
Note:  
◆
◆
You cannot program the 100 kHz or lower digits.  
The upper limit frequency cannot be set lower than the selected  
lower limit frequency.  
TIME-OUT TIMER  
The Time-out Timer limits the time of each transmission.  
The built-in Time-out Timer limits each transmission  
time to a maximum of 3, 5 or 10 (default) minutes. Just  
before the transceiver stops the transmission, a warning  
beep sounds. This function is necessary to protect the  
transceiver from thermal damage and can therefore not  
be turned OFF.  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 23  
(TOT).  
3 Press [MENU].  
4 Turn the Tuning control to select “3”, “5” or “10”  
(default) minutes.  
5 Press [MENU] to store the setting or [PTT] to cancel.  
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Note: A warning beep sounds even if you select Menu No. 27 (BP)  
OFF {page 85}.  
TX INHIBIT  
You can inhibit the transmission to prevent unauthorized  
individuals from transmitting, or to eliminate accidental  
transmissions while carrying the transceiver.  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 25 (TXI).  
3 Press [MENU].  
4 Turn the Tuning control to select “ON”.  
5 Press [MENU] to store the setting or [PTT] to cancel.  
•
“TX INH” appears and an error beep sounds if the  
transceiver tries to transmit while TX Inhibit is ON.  
TX POWER  
To change the transmission output power, press [F],  
[PTT].  
•
Each time you press [F], [PTT] the icon cycles from  
, and then back to  
➞
➞
.
The output power varies depending on the battery type  
and operating voltage. The table below shows the  
approximate output power when the transceiver  
operates with different types of battery or DC power  
sources.  
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Output  
Power  
Selection  
Battery  
Type  
Output Power (Approx.)  
H
M
L
3.5 W  
1.2 W  
0.3 W  
5.0 W  
1.5 W  
0.5 W  
5.0 W  
1.5 W  
0.5 W  
BT-14  
(9.0 V)  
H
M
L
PB-43N  
(7.2 V)  
H
M
L
DC IN  
(13.8 V)  
Note: If the DC IN voltage exceeds 14.5 V DC and “ ” (High Power)  
is selected, the “ ” icon blinks and the output power is automatically  
reduced to “ ” (Medium Power).  
VOX (VOICE-OPERATED TRANSMISSION)  
VOX eliminates the necessity of manually switching to  
the Transmission Mode each time you want to transmit.  
The transceiver automatically switches to Transmission  
Mode when the VOX circuitry senses that you have  
begun speaking into the microphone.  
When you operate the VOX function, you must use an  
optional microphone (KHS-21) because the internal  
speaker and microphone are too near to be used for the  
VOX function without using this headset.  
To turn the VOX function ON:  
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1 Press [MENU] then turn the Tuning control to select  
Menu No. 20 (VOX).  
2 Press [MENU] and turn the Tuning control to select  
the desired VOX gain level from 1 (least sensitive) to  
9 (most sensitive).  
•
To turn OFF the VOX function, select “OFF” in step 2.  
Note:  
◆
While in Menu Mode {page 24}, the VOX function is temporarily  
disabled.  
◆
Since the VOX circuit must detect the presence of your voice, you  
may notice a slight delay in transmission; the very first part of  
your message may not be transmitted.  
◆
◆
When the VOX function is ON, the ASC function turns OFF.  
VOX cannot be used with an optional Speaker/ Microsphone.  
VOX Gain  
To enjoy the VOX function, take the time to properly  
adjust the VOX Gain level. This level controls the VOX  
circuit to detect the presence or absence of your voice.  
There are 2 ways to adjust the VOX Gain.  
While the VOX function is ON:  
1 Continue from step 1 and 2, above.  
Press [MENU] to turn the VOX function ON, then  
press any key other than [LAMP], [MONI/SQL] and  
[MENU] to exit Menu Mode.  
2 Speak into the headset microphone using your  
normal tone of voice to transmit.  
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• If the transmission does not begin, you must  
readjust the VOX Gain so that transeiver  
transmits while you are speaking. To readjust the  
gain, press and hold [PTT] then turn the Tuning  
control to select a more sensitive gain level.  
• While readjusting the gain, you can release  
[PTT]. The transceiver will remain in Adjustment  
Mode for approximately 5 seconds.  
3 Adjust the VOX Gain by turning the Tuning control  
until the transceiver reliably switches to transmission  
mode each time you speak while the transceiver is  
transmitting.  
From the Menu:  
1 Continue from step 1 and 2 from VOX (Voice-  
Operated Trasmission) on page 97.  
2 Press [MENU] to store the VOX Gain level.  
•
“VOX” appears on the bottom right of the display when  
the VOX function is ON.  
3 Press any key other than [LAMP], [MONI/SQL] and  
[MENU] to exit Menu Mode.  
4 Adjust the VOX Gain, performing steps 1 to 3 until  
the transceiver reliably switches between  
transmission and reception each time you speak.  
•
The setting should not allow background noise to  
switch the transceiver to Transmission Mode.  
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VOX Delay Time  
If the transceiver returns to Reception Mode too quickly  
after you stop speaking, the end of your transmission  
may not be sent. To avoid this, select an appropriate  
delay time that allows your entire transmission to be  
sent, before Transmission Mode ends. However, do not  
make the delay overly long.  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 22 (VD).  
3 Press [MENU].  
4 Turn the Tuning control to select the desired delay  
time from 250, 500 (default), 750, 1000, 1500, 2000  
and 3000 ms.  
5 Press [MENU] to store the setting or [PTT] to cancel.  
6 While speaking into the microphone using your  
normal tone of voice, adjust the VOX delay time,  
performing steps 1 to 5 until the transceiver reliably  
switches between transmission and reception each  
time you speak.  
Note:  
◆
◆
◆
If you press [PTT] while the VOX function is ON, the VOX Delay  
Time is not reflected to the transmission.  
If you press [CALL] (if 1750 Hz is programmed) {page 35} to  
transmit a 1750 Hz tone, the VOX Delay Time is not reflected.  
If the DCS function {page 73} is ON, the transceiver remains in  
Transmission Mode for the duration set by the VOX Delay Time. It  
then sends a Turn-Off Code to close the receiving party’s squelch.  
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VOX on Busy  
You can configure the transceiver to force VOX  
transmission even if the transceiver is receiving a  
signal.  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 21  
(VXB).  
3 Press [MENU].  
4 Turn the Tuning control to select “ON”.  
•
To suppress the VOX transmission when the  
transceiver is receiving a signal, select “OFF”.  
5 Press [MENU] to store the setting or [PTT] to cancel.  
Note: You can press [PTT] or [CALL] (if 1750 Hz is programmed) to  
transmit, regardless of Menu No. 21 (VXB) settings.  
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OPTIONAL ACCESSORIES  
BC-21  
BT-14  
Battery Charger  
Battery Case (6 AA/ LR6)  
EMC-3  
HMC-3  
Clip Microphone with  
Earphone  
Headset (with VOX/ PTT)  
KHS-21  
KSC-24  
Headset  
Rapid Charger  
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MCP-1A  
PB-43N  
Memory Channel Control  
Software  
Ni-MH Battery Pack  
(7.2 V/ 1100 mAh)  
Refer to pages 105 and 107.  
PG-2W  
PG-3J  
DC Power Cable  
Cigarette Lighter Power  
Cable  
PG-4Y  
SMC-32  
PC Interface Cable  
Speaker Microphone  
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SMC-33  
SMC-34  
Speaker Microphone  
(with PF keys)  
Speaker Microphone (with  
PF keys and VOL control)  
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INTERFACING TO PERIPHERALS  
SP/MIC JACK  
The SP/MIC jack on the transceiver can be configured  
to interface to various kind of peripherals available for  
the transceiver, such as a speaker microphone  
(SMC-32/ 33/ 34) and PC interface cable (PG-4Y).  
Access Menu No. 31 (PC) and select “ON” or “OFF”.  
SP/MIC  
If you plug the speaker microphone or headset into the  
SP/MIC jack, access Menu No. 31 and select “OFF”  
(default). To emulate the programmable function keys  
using external keys (to control the transceiver), refer to  
the circuit diagram below.  
2.5 mm  
Speaker  
SP  
SP/MIC jack  
MIC  
Plug  
3.5 mm  
Plug  
Microphone  
10 µF  
5.0 V  
Note 1  
Note 2  
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Note 1: Voltage is developed across a 100Ω resistor on the 5 V line in  
the transceiver. When 2 mA flows, approximately 4.8 V is developed.  
Note 2: A 10 µF capacitor is not required in the following cases:  
•
•
When other equipment has DC blocking capacitors.  
When a 2-terminal electret condenser microphone is used.  
PC  
To connect the transceiver to a PC in order to manage  
the memory channels in the transceiver, use the PG-4Y  
PC interface cable. You will also need the supported  
software to manage the memory channel contents of the  
transceiver. To download the software, access the  
following URL:  
http://www.kenwood.com/i/products/info/amateur.htm.  
To use the software, access Menu No. 31 and select  
“ON” {page 107}.  
For your reference, the following diagram shows how  
the transceiver communicates to the PC using a serial  
(COM) port.  
Level  
converter  
RXD  
DTR  
DSR  
GND  
2.5 mm  
Plug  
SP  
SP/MIC jack  
COM port  
RTS  
CTS  
TXD  
3.5 mm  
Plug  
MIC  
Note: Contact an authorized KENWOOD dealer for the PG-4Y, PC  
Interface cable availability.  
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■ Using the PG-4Y PC Interface Cable  
Use the PG-4Y PC interface cable to connect  
between the transceiver and PC. Plug the Speaker/  
Microphone connector to the SP/MIC jack and DB-9  
connector to one of the COM (serial) ports on your  
PC.  
PC  
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■ Using the MCP-1A Software  
When the transceiver is connected to a PC in order  
to use the MCP-1A (Memory Channel Control  
Program) software, you must configure the SP/MIC  
jack function prior to using the software.  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 31  
(PC).  
3 Press [MENU].  
4 Turn the Tuning control to select “ON”.  
5 Press [MENU] to store the setting or press [PTT]  
to cancel.  
6 Press any key other than [LAMP], [MONI/SQL],  
and [MENU] to exit Menu Mode.  
Note: If you use an optional Speaker/ Microphone after using  
the MCP software, select “OFF” in step 4. Otherwise, the  
Speaker/ Micrphone does not function properly.  
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TROUBLESHOOTING  
GENERAL INFORMATION  
Your transceiver has been factory aligned and tested to  
specification before shipment. Under normal  
circumstances, the transceiver will operate in  
accordance with these operating instructions. All  
adjustable trimmers, coils and resistors in the  
transceiver were preset at the factory. They should only  
be readjusted by a qualified technician who is familiar  
with this transceiver and has the necessary test  
equipment. Attempting service or alignment without  
factory authorization can void the transceiver warranty.  
When operated properly, the transceiver will provide  
years of service and enjoyment without requiring further  
realignment. The information in this section gives some  
general service procedures requiring little or no test  
equipment.  
Service  
If it is ever necessary to return the equipment to your  
dealer or service center for repair, pack the transceiver  
in its original box and packing material. Include a full  
description of the problems experienced. Include your  
telephone number, fax number, and email address (if  
available) along with your name and address in case the  
service technician needs to contact you for further  
information while investigating your problem. Do not  
return accessory items unless you feel they are directly  
related to the service problem.  
You may return your transceiver for service to the  
authorized KENWOOD dealer from whom you  
purchased it or to any authorized KENWOOD service  
108  
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center. A copy of the service report will be returned with  
the transceiver. Please do not send subassemblies or  
printed circuit boards; send the complete transceiver.  
Tag all returned items with your name and call sign for  
identification. Please mention the model and serial  
number of the transceiver in any communication  
regarding the problem.  
Service Note  
If you desire to correspond on a technical or operational  
problem, please make your note short, complete, and to  
the point. Help us help you by providing the following:  
1 Model and serial number of equipment  
2 Question or problem you are having  
3 Other equipment in your station pertaining to the  
problem  
4 Meter readings  
5 Other related information (menu setup, mode,  
frequency, key sequence to induce malfunction, etc.)  
Do not pack the equipment in crushed newspapers for shipment!  
Extensive damage may result during rough handling or shipping.  
Note:  
◆
◆
◆
Record the date of purchase, serial number and dealer from  
whom the transceiver was purchased.  
For your own information, retain a written record of any  
maintenance performed on the transceiver.  
When claiming warranty service, please include a photocopy of  
the bill of sale or other proof-of-purchase showing the date of  
sale.  
109  
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Cleaning  
The keys, controls, and case of the transceiver are likely  
to become soiled after extended use. Remove the  
controls from the transceiver and clean them with a  
neutral detergent and warm water. Use a neutral  
detergent (no strong chemicals) and a damp cloth to  
clean the case.  
BACKUP BATTERY  
This transceiver uses an EEPROM to store memory  
channel data, menu configurations, and all necessary  
operation parameters. So, you never have to worry  
about replacing back-up batteries to operate the  
transceiver.  
110  
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MICROPROCESSOR RESET  
If your transceiver seems to be malfunctioning, resetting  
the microprocessor may solve the problem. The  
following 2 reset Modes are available. When performing  
the reset, you may lose memory data and stored  
information. Back up or write down important data  
before performing the reset.  
Initial Settings  
The factory defaults for the operating frequencies are as  
follows:  
•
•
TH-K2AT/ E/ ET: 144.000 MHz  
TH-K4AT/ E: 430.000 MHz  
The Memory channels have no data stored. The  
Weather Radio frequency (AL channel) is restored as  
162.550 MHz (TH-K2AT K/ K2 only). Refer to pages 53,  
55 and 87 for the Call Channel, Weather Radio  
frequency and frequency step size default values.  
Full Reset  
This resets all transceiver parameters to the factory  
default values.  
VFO Reset  
This resets the transceiver parameters excluding the  
stored DTMF Number in Memory {page 77} and  
memory channel contents.  
Note: While transceiver is operating in the Channel Display Mode  
{page 57}, you cannot reset the transceiver.  
111  
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Performing Reset  
There are 2 ways to enter the Reset Mode selection.  
However, the transceiver’s Lock function must be turned  
OFF {page 88}.  
When the transceiver is turned OFF:  
■ Full reset  
1 Press [F]+[ ] (POWER).  
•
All indicators are lit.  
2 Release [F].  
The full reset confirmation message, “FL.RST?”,  
appears.  
•
3 Press [F] to proceed.  
•
•
“SURE ?” appears.  
Press any key other than [F], [LAMP] and  
[MONI/SQL] to exit the Reset Mode.  
4 Press [F] to reset the transceiver.  
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■ VFO reset  
1 Press [VFO]+[ ] (POWER).  
2 Release [VFO].  
•
The VFO reset confirmation message, “VF.RST?”,  
appears.  
3 Press [VFO] to proceed.  
•
•
“SURE ?” appears.  
Press any key other than [VFO], [LAMP] and  
[MONI/SQL] to exit the Reset Mode.  
4 Press [VFO] to reset the transceiver.  
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Reset using the Menu  
1 Press [MENU].  
2 Turn the Tuning control to select Menu No. 99  
(RESET).  
3 Press [MENU].  
4 Turn the Tuning control to select the Reset Mode,  
“FULL” or “VFO”.  
5 Press [MENU] to select the Reset Mode.  
•
“SURE ?” appears.  
•
Press any key other than [MENU], [LAMP] and  
[MONI/SQL] to exit the Reset Mode.  
6 Press [MENU] to reset the transceiver.  
114  
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OPERATION NOTICES  
The transceiver has been designed and engineered to  
avoid possible hardware glitches. However, you may  
notice the following symptoms when you operate the  
transceiver. These symptoms are not malfunctions.  
Operating Voltage  
As stated in “SPECIFICATIONS” {page 122}, this  
transceiver operates on 6.0 V ~ 9.0 V DC (battery  
terminal) or 12.0 V ~ 16.0 V DC (DC IN jack). If you  
find that the transceiver cannot be switched ON, or  
“DC ERR” appears, the supplied power source may be  
outside of the specified range.  
In such a case, remove the DC power cable from the  
transceiver immediately and confirm that the power  
source voltage is within the specified range.  
If you are using a variable DC power supply to operate  
the transceiver, adjust the DC power supply voltage to  
13.8 V DC. Considering the output power efficiency and  
thermal characteristics of the transceiver, this is the  
optimal voltage to operate the transceiver. If the voltage  
at DC IN jack exceeds 14.5 V, the transceiver output  
power is automatically reduced to “ ” power.  
Receiving Signals in Cities  
When you receive signals in cities, the receiver’s entire  
S-meter may light up without receiving any strong  
signals. This happens when the RF amplifier in the  
receiver is overloaded by strong interference signals  
that are nearby.  
115  
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Transmission  
If you continuously transmit for more than 8 minutes  
at high power (5 W), the transceiver becomes warm.  
If you continue or repeat the transmission before the  
transceiver cools down, the thermal protector gradually  
decreases the output power down to 1.5 W.  
“
” also blinks at the same time. If this happens, let the  
transceiver cool down for a while before transmitting  
again.  
Internal Beats  
On some spots of the frequency {page 121}, the  
S-meter moves without receiving any signals or you  
cannot receive any signals. This is inevitable when you  
use super-heterodyne receivers. If this happens,  
access Menu No. 28 (BS) and select “ON”.  
116  
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TROUBLESHOOTING  
The problems described in the following tables are  
commonly encountered operational malfunctions.  
These types of difficulties are usually caused by  
improper hook-up, accidental incorrect control settings,  
or operator error due to incomplete programming.  
These problems are usually not caused by circuit  
failure. Please review these tables and the appropriate  
section(s) of this instruction manual before assuming  
your transceiver is defective.  
Note: Placing powered PC peripherals near this transceiver may  
cause noise in the transceiver.  
Ref.  
Problem  
Solution  
Page  
Nothing appears on the  
display when the transceiver  
is switched ON, or the  
display is blinking ON and  
OFF.  
• The battery pack is  
2, 6  
discharged. Recharge the  
battery pack or replace the  
batteries.  
• The DC cable or connection is  
bad. Replace the cable.  
• The power supply fuse is open  
(blown). Investigate the cause  
for the open fuse and replace  
the fuse.  
8
9
Most keys and the Tuning • Transceiver Lock function is  
control do not function.  
88  
57  
ON (the “  
” icon is visible).  
Press [F] (1 s) to turn OFF  
Transceiver Lock.  
• The transceiver is in Channel  
Display Mode. Press  
[PTT]+[MR]+[ ] (POWER) to  
exit Channel Display Mode.  
117  
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Ref.  
Page  
87  
Problem  
Solution  
You cannot select the exact • The current frequency step  
desired frequency using the  
Tuning control.  
size does not allow the  
frequency to be selected.  
Select an appropriate  
frequency step size in Menu  
No. 1 (STP).  
• Programmable VFO frequency 93  
range is too narrow. Expand  
the frequency range in Menu  
No. 7 (P.VFO).  
You cannot recall any  
memory channel.  
• You have stored no data in  
any of the memory channels.  
Store the desired frequencies  
in the memory channels.  
44  
91  
69  
The receiving sound volume • The receiving station may be  
is weak even if the signal is  
strong.  
operating in narrow band FM  
bandwidth. Access Menu No.  
29 (FMN) and select “ON”.  
• The selective call function  
(CTCSS or DCS) is ON. Turn  
OFF the selective call function.  
Turning the VOL control  
does not allow you to hear  
audio.  
Even if the Speaker/  
• The transceiver is in PC Mode. 107  
Access Menu No. 31 (PC) and  
select “OFF”.  
Microphone is plugged into  
the SP/MIC jack, you cannot  
transmit/ receive (and/ or  
remote control) through the  
Speaker/ Microphone.  
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Ref.  
Page  
20  
Problem  
Solution  
You cannot transmit by  
pressing [PTT].  
• You selected a frequency  
outside the allowable range.  
Select a frequency within the  
allowable transmit frequency  
range.  
• You selected a transmit offset  
that places the transmit  
frequency outside the limit.  
Select a proper offset direction  
or offset frequency.  
33  
95  
• TX inhibit is ON. Access  
Menu No. 25 (TXI) and select  
“OFF”.  
• The battery pack voltage is too 2, 6  
low to transmit. Change or  
replace the battery pack.  
Repeater cannot be  
accessed.  
• Wrong tone frequency is  
selected. Select a proper  
repeater access tone.  
• Wrong repeater offset  
frequency is selected. Access  
Menu No. 8 (OFFSET) and  
select an appropriate offset  
frequency.  
35  
33  
• Wrong shift direction is  
selected. Try other shift  
directions.  
• DTMF Lock is ON. Access  
Menu No. 36 (DT.L) and select  
“OFF”.  
32  
81  
DTMF tone cannot be  
transmitted.  
119  
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Ref.  
Page  
80  
Problem  
Solution  
Repeater does not accept  
your DTMF tones.  
• DTMF tone transmission  
duration is too short. Access  
Menu No. 33 (SPD) and select  
“SL” (SLOW).  
Transceiver transmits  
without pressing [PTT].  
• VOX function is ON. Access  
Menu No. 20 (VOX) and select  
“OFF”.  
• The Automatic Power OFF  
(APO) function is ON. Access  
Menu No. 17 (APO) and select  
your desired time length or  
“OFF”.  
96  
82  
The transceiver switches  
OFF for no apparent reason.  
The transceiver returns to  
Reception Mode during a  
long transmission.  
• The transmission time  
exceeded the programmed  
TOT time. Access Menu No.  
23 (TOT) to select your  
desired transmission length.  
The TOT cannot be turned  
OFF, protecting the  
94  
transceiver from the thermal  
damage.  
The Scan function does not • You have selected “SE”  
68  
resume scanning after the  
transceiver detects a signal.  
(SEEK) for Menu No. 11  
(SCAN). Select either “TO”  
(Time-Operated) or “CO”  
(Carrier-Operated) for Menu  
No. 11 (SCAN).  
120  
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INTERNAL BEATS FREQUENCY LIST  
TH-K2AT/ E/ ET  
140.800 MHz, 153.600 MHz, 166.400 MHz,  
168.350 MHz  
TH-K4AT/ E  
453.250 MHz  
121  
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SPECIFICATIONS  
TH-K2AT  
M, M2  
General  
Market code  
K, K2  
100 (50) + 100 (50) +  
Number of memory  
channels  
9 special  
function  
8 special  
function  
memories  
memories  
Antenna impedance  
(Connector type)  
50Ω (SMA)  
DC 12.0 ~ 16.0 V  
(13.8 V nominal)  
DC IN jack  
Operating  
Voltage  
Battery  
terminal  
DC 6.0 ~ 9.0 V  
(7.2 V nominal)  
Grounding method  
Negative ground  
Transmit with  
H, 13.8 V  
(DC IN)  
1.8 A or less  
Transmit with  
H, 7.2 V  
(PB-43N)  
2.0 A or less  
1.5 A or less  
0.8 A or less  
Current  
Transmit with  
M, 7.2 V  
(PB-43N)  
Transmit with  
L, 7.2 V  
(PB-43N)  
122  
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TH-K2AT  
K, K2 M, M2  
General  
Market code  
Receive  
(no signal)  
100 mA or less  
30 mA or less  
Current  
Battery Saver  
ON (Average)  
–20°C ~ 60°C  
(–4°F ~ 140°F)  
–10°C ~ 60°C  
(+14°F ~ 140°F)  
with PB-43N  
Usable temperature range  
Frequency stability  
Within ±5ppm  
(–20°C ~ 60°C)  
58 x 110 x 35.8 mm/  
2
7/16" x 4 6/16" x 1 7/16"  
Dimensions  
(W x H x D including  
Projections)  
with PB-43N  
58 x 110 x 37 mm/  
2
7/16" x 4 6/16" x 1 1/2"  
with BT-14  
Approx. 320 g/ 11.3 oz.  
with PB-43N  
Approx. 320 g/ 11.3 oz.  
with BT-14  
Weight  
Note: All specifications (General, Transmitter and Receiver) are  
guaranteed within the amateur radio band.  
123  
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TH-K2AT  
M, M2  
F3E (FM)/ F2D (FM)  
Transmitter  
Market code  
K, K2  
Transmission Mode  
Frequency range  
144 ~ 148  
MHz  
136 ~ 174  
MHz  
H: 5.0 W (approx.)  
M: 1.5 W (approx.)  
L: 0.5 W (approx.)  
DC IN jack  
(13.8 V)  
H: 5.0 W (approx.)  
M: 1.5 W (approx.)  
L: 0.5 W (approx.)  
Output  
Power  
PB-43N  
(7.2 V)  
H: 3.5 W (approx.)  
M: 1.2 W (approx.)  
L: 0.3 W (approx.)  
BT-14  
(9.0 V)  
Modulation  
Reactance  
Maximum frequency  
deviation  
±5 kHz (FM)/  
±2.5 kHz (NFM)  
–60 dB or less  
(H and M power)  
–50 dB or less  
(L power)  
Spurious emissions  
Microphone impedance  
2kΩ  
124  
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TH-K2AT  
M, M2  
Receiver  
Market code  
K, K2  
Reception Mode  
Frequency range  
F3E (FM)/ F2D (FM)  
136 ~ 174 MHz  
Intermediate Frequency  
(IF)  
1st IF: 38.85 MHz  
2nd IF: 450 kHz  
Circuit type  
Double super-heterodyne  
FM (12 dB SINAD)  
2 m amateur radio band:  
0.18 µV or less  
Sensitivity  
0.13 µV or less  
(within 2 m amateur  
radio band)  
Squelch sensitivity  
FM (normal)  
–6 dB/ 10 kHz or less  
–40 dB/ 28 kHz or less  
(within 2 m amateur  
radio band)  
Selectivity  
FMN (narrow)  
–6 dB/ 10 kHz or less  
–40 dB/ 28 kHz or less  
(within 2 m amateur  
radio band)  
Audio output  
400 mW or higher  
(10% distortion)  
(7.2 V, 8Ω load)  
125  
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TH-K2E  
TH-K2ET  
E3  
General  
Market code  
E
Number of memory  
channels  
100 (50) + 8 special  
function memories  
Antenna impedance  
(Connector type)  
50Ω (SMA)  
DC 12.0 ~ 16.0 V  
(13.8 V nominal)  
DC IN jack  
Operating  
Voltage  
Battery  
terminal  
DC 6.0 ~ 9.0 V  
(7.2 V nominal)  
Grounding method  
Negative ground  
Transmit with  
H, 13.8 V  
(DC IN)  
1.8 A or less  
Transmit with  
H, 7.2 V  
(PB-43N)  
2.0 A or less  
1.5 A or less  
0.8 A or less  
Current  
Transmit with  
M, 7.2 V  
(PB-43N)  
Transmit with  
L, 7.2 V  
(PB-43N)  
126  
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TH-K2E  
TH-K2ET  
E3  
General  
Market code  
E
Receive  
(no signal)  
100 mA or less  
30 mA or less  
Current  
Battery Saver  
ON (Average)  
–20°C ~ 60°C  
(–4°F ~ 140°F)  
–10°C ~ 60°C  
(+14°F ~ 140°F)  
with PB-43N  
Usable temperature range  
Frequency stability  
Within ±5ppm  
(–20°C ~ 60°C)  
58 x 110 x 35.8 mm/  
2
7/16" x 4 6/16" x 1 7/16"  
Dimensions  
(W x H x D including  
Projections)  
with PB-43N  
58 x 110 x 37 mm/  
2
7/16" x 4 6/16" x 1 1/2"  
with BT-14  
Approx. 320 g/ 11.3 oz.  
with PB-43N  
Approx. 320 g/ 11.3 oz.  
with BT-14  
Weight  
Note: All specifications (General, Transmitter and Receiver) are  
guaranteed within the amateur radio band.  
127  
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TH-K2E  
TH-K2ET  
E3  
Transmitter  
Market code  
E
Transmission Mode  
Frequency range  
F3E (FM)/ F2D (FM)  
144 ~ 146 MHz  
H: 5.0 W (approx.)  
M: 1.5 W (approx.)  
L: 0.5 W (approx.)  
DC IN jack  
(13.8 V)  
H: 5.0 W (approx.)  
M: 1.5 W (approx.)  
L: 0.5 W (approx.)  
Output  
Power  
PB-43N  
(7.2 V)  
H: 3.5 W (approx.)  
M: 1.2 W (approx.)  
L: 0.3 W (approx.)  
BT-14  
(9.0 V)  
Modulation  
Reactance  
Maximum frequency  
deviation  
±5 kHz (FM)/  
±2.5 kHz (NFM)  
–60 dB or less  
(H and M power)  
–50 dB or less  
(L power)  
Spurious emissions  
Microphone impedance  
2kΩ  
128  
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TH-K2E  
TH-K2ET  
E3  
Receiver  
Market code  
E
Reception Mode  
Frequency range  
F3E (FM)/ F2D (FM)  
144 ~ 146 MHz  
Intermediate Frequency  
(IF)  
1st IF: 38.85 MHz  
2nd IF: 450 kHz  
Circuit type  
Double super-heterodyne  
FM (12 dB SINAD)  
2 m amateur radio band:  
0.18 µV or less  
Sensitivity  
0.13 µV or less  
(within 2 m amateur  
radio band)  
Squelch sensitivity  
FM (normal)  
–6 dB/ 10 kHz or less  
–40 dB/ 28 kHz or less  
(within 2 m amateur  
radio band)  
Selectivity  
FMN (narrow)  
–6 dB/ 10 kHz or less  
–40 dB/ 28 kHz or less  
(within 2 m amateur  
radio band)  
Audio output  
400 mW or higher  
(10% distortion)  
(7.2 V, 8Ω load)  
129  
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TH-K4AT  
M2  
TH-K4E  
General  
Market code  
E
Number of memory  
channels  
100 (50) + 8 special  
function memories  
Antenna impedance  
(Connector type)  
50Ω (SMA)  
DC 12.0 ~ 16.0 V  
(13.8 V nominal)  
DC IN jack  
Operating  
Voltage  
Battery  
terminal  
DC 6.0 ~ 9.0 V  
(7.2 V nominal)  
Grounding method  
Transmit with  
Negative ground  
H, 13.8 V  
(DC IN)  
1.8 A or less  
Transmit with  
H, 7.2 V  
(PB-43N)  
2.0 A or less  
1.5 A or less  
0.8 A or less  
Current  
Transmit with  
M, 7.2 V  
(PB-43N)  
Transmit with  
L, 7.2 V  
(PB-43N)  
130  
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TH-K4AT  
M2  
TH-K4E  
General  
Market code  
M
Receive  
(no signal)  
100 mA or less  
30 mA or less  
Current  
Battery Saver  
ON (Average)  
–20°C ~ 60°C  
(–4°F ~ 140°F)  
–10°C ~ 60°C  
Usable temperature range  
Frequency stability  
(+14°F ~ 140°F)  
with PB-43N  
Within ±5ppm  
(–20°C ~ 60°C)  
58 x 110 x 35.8 mm/  
2
7/16" x 4 6/16" x 1 7/16"  
Dimensions  
(W x H x D including  
Projections)  
with PB-43N  
58 x 110 x 37 mm/  
2
7/16" x 4 6/16" x 1 1/2"  
with BT-14  
Approx. 320 g/ 11.3 oz.  
with PB-43N  
Approx. 320 g/ 11.3 oz.  
with BT-14  
Weight  
Note: All specifications (General, Transmitter and Receiver) are  
guaranteed within the amateur radio band.  
131  
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TH-K4AT  
M2  
F3E (FM)/ F2D (FM)  
TH-K4E  
Transmitter  
Market code  
E
Transmission Mode  
Frequency range  
400 ~ 470  
MHz  
430 ~ 440  
MHz  
H: 5.0 W (approx.)  
M: 1.5 W (approx.)  
L: 0.5 W (approx.)  
DC IN jack  
(13.8 V)  
H: 5.0 W (approx.)  
M: 1.5 W (approx.)  
L: 0.5 W (approx.)  
Output  
Power  
PB-43N  
(7.2 V)  
H: 3.5 W (approx.)  
M: 1.2 W (approx.)  
L: 0.3 W (approx.)  
BT-14  
(9.0 V)  
Modulation  
Reactance  
Maximum frequency  
deviation  
±5 kHz (FM)/  
±2.5 kHz (NFM)  
–60 dB or less  
(H and M power)  
–50 dB or less  
(L power)  
Spurious emissions  
Microphone impedance  
2kΩ  
132  
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TH-K4AT  
M2  
F3E (FM)/ F2D (FM)  
TH-K4E  
Receiver  
Market code  
E
Reception Mode  
Frequency range  
400 ~ 470  
MHz  
430 ~ 440  
MHz  
Intermediate Frequency  
(IF)  
1st IF: 38.85 MHz  
2nd IF: 450 kHz  
Circuit type  
Double super-heterodyne  
FM (12 dB SINAD)  
within 70 cm band:  
0.18 µV or less  
Sensitivity  
0.13 µV or less  
(within 70 cm amateur  
radio band)  
Squelch sensitivity  
FM (normal)  
–6 dB/ 10 kHz or less  
–40 dB/ 28 kHz or less  
(within 70 cm amateur  
radio band)  
Selectivity  
FMN (narrow)  
–6 dB/ 10 kHz or less  
–40 dB/ 28 kHz or less  
(within 70 cm amateur  
radio band)  
Audio output  
400 mW or higher  
(10% distortion)  
(7.2 V, 8Ω load)  
133  
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INDEX  
A
All-Channel Scan ......................................................... 63  
Alkaline Batteries, Installing............................................ 2  
APO (Menu No. 17) ..................................................... 82  
ARO (Menu No. 9) ....................................................... 37  
ASC (Automatic Simplex Check) .................................. 38  
Automatic Dialer........................................................... 77  
B
Band Scan ................................................................... 60  
Battery  
Installing the Alkaline ................................................. 2  
Installing the PB-43N Ni-MH, Pack ............................ 1  
Life ......................................................................... 83  
Remaining .............................................................. 83  
Saver ...................................................................... 84  
BCL (Menu No. 24) ...................................................... 86  
Beat Shift ..................................................................... 85  
Beep Function.............................................................. 85  
Belt Clip, Installing the .................................................... 5  
BP (Menu No. 27) ........................................................ 85  
BS (Menu No. 28) ........................................................ 85  
Busy Channel Lockout ................................................. 86  
C
Call Channel, Recalling ................................................ 53  
Call Scan ..................................................................... 64  
Carrier-Operated Mode ................................................ 68  
Channel Display ........................................................... 57  
Charging the PB-43N Ni-MH Battery Pack ..................... 6  
Cigarette Lighter Socket ................................................. 8  
CK (Menu No. 18) ........................................................ 36  
134  
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Clearing  
Memory Channel .................................................... 47  
COM Port................................................................... 106  
CT (Menu No. 4) .......................................................... 70  
CTCSS  
Freq. ID Scan.......................................................... 72  
Selecting a, Frequency ........................................... 70  
Using ...................................................................... 69  
D
DC IN jack ........................................................6, 12, 115  
DCS (Menu No. 5)  
Code ID Scan ......................................................... 75  
Selecting a, Code.................................................... 74  
Using ...................................................................... 73  
Direct Frequency Entry ................................................ 21  
Display  
LCD ........................................................................ 14  
DT.H (Menu No. 34) ..................................................... 77  
DT.L (Menu No. 36) ...................................................... 81  
DTMF  
Adjusting the Pause Duration .................................. 80  
Adjusting the, Tone Transmission Speed ................. 80  
Automatic Dialer...................................................... 77  
Key Lock ................................................................. 81  
Manual Dialing ........................................................ 76  
Storing a, Number in memory ................................. 77  
Transmitting a Stored, Number................................ 79  
TX hold ................................................................... 77  
DTMF.MR (Menu No. 32) ............................................. 77  
E
ENC (Menu No. 30) ..................................................... 89  
F
First QSO..................................................................... 10  
FMN (Menu No. 29) ..................................................... 91  
135  
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Frequency Step Size .................................................... 86  
Full Reset ...................................................................111  
H
HLD (Menu No. 19) ...................................................... 36  
I
Installing  
the Alkaline Batteries................................................. 2  
the Antenna .............................................................. 4  
the Belt Clip .............................................................. 5  
the PB-43N Ni-MH Battery Pack ............................... 1  
Internal Beats......................................................116, 121  
K
Keys and Control ................................................... 12, 13  
L
Lamp ........................................................................... 88  
Lock Function .............................................................. 88  
L.OUT (Menu No. 12)................................................... 67  
M
Manual Dialing ............................................................. 76  
M.CH (Menu No. 13) .................................................... 41  
MDF (Menu No. 15) ..................................................... 49  
Memory Channel  
Lockout ................................................................... 67  
Naming a ................................................................ 48  
Recalling ................................................................. 46  
Transfer .................................................................. 50  
Menu  
Access .................................................................... 24  
Function List ........................................................... 26  
Meter ..................................................................... 15, 83  
MHz Mode ................................................................... 20  
Microphone PF Keys (optional) .................................... 89  
Microprocessor Reset .................................................111  
136  
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M.NAME (Menu No. 14) ............................................... 48  
N
Narrow Band FM Operation ......................................... 91  
Normal Scan ................................................................ 60  
O
Odd-split Frequency ..................................................... 42  
Offset  
Programming .......................................................... 32  
Programming Flow .................................................. 32  
Selecting, Direction ................................................. 32  
Selecting, Frequency .............................................. 33  
OFFSET (Menu No. 8) ................................................. 93  
Operating Voltage ...................................................... 115  
Optional Accessories.................................................. 101  
P
PA (Menu No. 35)......................................................... 80  
PC (Menu No. 31) ...................................................... 107  
PF Keys, Microphone (Optional) .................................. 89  
P.ON.MSG (Menu No. 26) ............................................ 92  
Power ON/ OFF ........................................................... 17  
PRI (Menu No. 10) ....................................................... 66  
Priority Channel  
Programming .......................................................... 65  
Using, Scan ............................................................ 65  
Priority Scan ................................................................ 65  
Program Scan  
Storing, Frequency Range ...................................... 61  
Programmable VFO ..................................................... 93  
P.VFO (Menu No. 7) ..................................................... 93  
R
Recalling  
Call Channel ........................................................... 53  
Memory Channel .................................................... 46  
137  
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Regulated Power Supply................................................ 9  
Repeater Offset, Automatic .......................................... 37  
Repeater Operation ..................................................... 31  
Reprogramming  
the Call Channel ..................................................... 54  
Reset  
Full ....................................................................... 112  
VFO ...................................................................... 113  
RESET (Menu No. 99) ............................................... 114  
Reverse Function ......................................................... 38  
S
SAV (Menu No. 16) ...................................................... 84  
Scan  
All-Channel ............................................................. 63  
Band ....................................................................... 60  
Call ......................................................................... 64  
Carrier-Operated Mode ........................................... 68  
Seek Mode ............................................................. 68  
Time-Operated Mode .............................................. 68  
SCAN (Menu No. 11) ................................................... 68  
SFT (Menu No. 6) ........................................................ 32  
Simplex  
Storing, Frequencies or Standard ............................ 44  
SPD (Menu No. 33)...................................................... 80  
Specifications............................................................. 122  
Squelch, Adjusting ....................................................... 18  
Supplied Accessories ....................................................vii  
SP/MIC .......................................................... 12, 89, 104  
STP (Menu No. 1) ........................................................ 86  
Switching Power ON/ OFF ........................................... 17  
T
T (Menu No. 3) ....................................................... 34, 35  
T.CT.DCS (Menu No. 2) ................................... 34, 69, 73  
138  
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Time-Operated Mode ................................................... 68  
Time-out Timer ............................................................. 94  
Tone  
Activating, Function ................................................. 34  
Freq. ID Scan.......................................................... 39  
Selecting a, Frequency ........................................... 35  
Transmit a 1750 Hz ................................................. 36  
TOT (Menu No. 23) ...................................................... 94  
Transmitting ................................................................. 19  
Troubleshooting ......................................................... 108  
Tuning Control Unlock .................................................. 89  
TXI (Menu No. 25) ....................................................... 95  
TX Inhibit ..................................................................... 95  
TX Power ..................................................................... 95  
V
VD (Menu No. 22) ........................................................ 99  
VFO  
Mode ...................................................................... 20  
Programmable ........................................................ 93  
Reset .....................................................................111  
Volume  
Adjusting ................................................................. 17  
VOX (Voice-Operated Transmission)  
Delay Time.............................................................. 99  
Gain ........................................................................ 97  
on Busy ................................................................ 100  
VOX (Menu No. 20) ..................................................... 96  
VXB (Menu No. 21) .................................................... 100  
W
WX .............................................................................. 55  
WXA (Menu No. 37) ..................................................... 56  
1750 Hz ....................................................................... 36  
139  
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