INSTRUCTION MANUAL
VHF MARINE TRANSCEIVER
iM502
This device complies with Part 15 of the FCC rules. Operation is sub-
ject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
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TABLE OF CONTENTS
IMPORTANT .............................................. i
IN CASE OF EMERGENCY ...................... i
TABLE OF CONTENTS ............................ ii
CAUTIONS ............................................... iii
■ Position and time programming .... 14
■ Position indication ......................... 15
■ Distress call .................................. 16
■ Transmitting DSC calls ................. 17
■ Setting the distress information .... 21
■ DSC individual ID ......................... 22
■ Receiving DSC calls ..................... 23
■ DSC set mode .............................. 26
■ Receive messages ....................... 28
12 SPECIFICATIONS AND
OPTIONS ........................... 42–43
■ Specifications ............................... 42
■ Options ......................................... 43
1
2
OPERATING RULES .................. 1
13 HM-127 REMOTE-CONTROL
MICROPHONE ................... 44–56
■ Panel description .......................... 44
■ Function display ............................ 46
■ HM-127 supplied accessories ...... 47
■ Installation .................................... 48
■ Channel selection ......................... 50
■ Receiving and transmitting ........... 51
■ RF attenuator function .................. 51
■ Lock functions ............................... 52
■ Display backlighting ...................... 52
■ Monitor function ............................ 52
■ Call channel programming ............ 53
■ Optional voice scrambler
PANEL DESCRIPTION .......... 2–5
■ Panel description ............................ 2
■ Function display .............................. 4
■ Microphone ..................................... 5
7
8
INTERCOM OPERATION ......... 29
■ Intercom operation ........................ 29
3
BASIC OPERATION ............ 6–10
■ Channel selection ........................... 6
■ Microphone lock function ................ 7
■ Receiving and transmitting ............. 8
■ Call channel programming .............. 9
■ Channel names .............................. 9
■ Optional voice scrambler
SET MODE ........................ 30–33
■ Set mode programming ................ 30
■ Set mode items ............................. 31
9
CONNECTIONS AND
MAINTENANCE ................. 34–39
■ Supplied accessories .................... 34
■ Antenna ........................................ 34
■ Fuse replacement ......................... 34
■ Cleaning ....................................... 34
■ Connections .................................. 35
■ Mounting the transceiver .............. 36
■ Optional unit installation ............... 38
■ Dimensions.................................... 39
operation ....................................... 10
operation ....................................... 53
■ Starting a scan .............................. 54
■ Setting tag channels ..................... 54
■ Dualwatch/Tri-watch operation ..... 54
■ Set mode programming ................ 55
■ Intercom operation ........................ 56
■ Channel names ............................ 56
4
5
DUALWATCH/TRI-WATCH ....... 11
■ Description .................................... 11
■ Operation ...................................... 11
SCAN OPERATIONS ......... 12–13
■ Scan types .................................... 12
■ Setting tag channels ..................... 13
■ Starting a scan .............................. 13
10 TROUBLESHOOTING .............. 40
11 CHANNEL LIST ........................ 41
TEMPLATE
6
DSC OPERATION .............. 14–28
■ MMSI code programming ............. 14
ii
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CAUTIONS
AVOID the use of chemical agents such as benzine or al-
cohol when cleaning, as they may damage the transceiver
surfaces.
RWARNING! NEVER connect the transceiver to an AC
outlet. This may pose a fire hazard or result in an electric
shock.
BE CAREFUL! The transceiver rear panel will become
hot when operating continuously for long periods.
CAUTION: Changes or modifications to this device, not ex-
pressly approved by Icom Inc., could void your authority to
operate this device under FCC regulations.
Place the transceiver in a secure place to avoid inadvertent
use by children.
NEVER connect the transceiver to a power source of more
than 16 V DC or use reverse polarity. This will ruin the trans-
ceiver.
BE CAREFUL! The transceiver and optional HM-127 em-
ploy waterproof construction, which corresponds to JIS wa-
terproof specification, grade 7 (1 m/30 min.). However, once
the transceiver or microphone has been dropped, water-
proofing cannot be guaranteed due to the fact that the case
may be cracked, or the waterproof seal damaged, etc.
NEVER cut the DC power cable between the DC plug and
fuse holder. If an incorrect connection is made after cutting,
the transceiver may be damaged.
NEVER place the transceiver where normal operation of the
vehicle may be hindered or where it could cause bodily injury.
KEEP the transceiver at least 3.3 ft (1 m) away from the
ship’s navigation compass.
DO NOT use or place the transceiver in areas with temper-
atures below –4°F (–20°C) or above +140°F (+60°C) or, in
areas subject to direct sunlight, such as the dashboard.
CLEAN THE TRANSCEIVER AND MICROPHONE
THOROUGHLY WITH FRESH WATER after exposure to
water including fresh water, otherwise, the keys and
switches may become inoperable due to salt crystallization.
iii
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OPERATING RULES
1
(2) OPERATOR’S LICENSE
PRIORITIES
A Restricted Radiotelephone Operator Permit is the license
most often held by small vessel radio operators when a radio
is not required for safety purposes.
•Read all rules and regulations pertaining to priorities and
keep an up-to-date copy handy. Safety and distress calls
take priority over all others.
•You must monitor channel 16 when you are not operating on
another channel.
The Restricted Radiotelephone Operator Permit must be
posted or kept with the operator. Only a licensed radio opera-
tor may operate a transceiver.
•False or fraudulent distress signals are prohibited and pun-
ishable by law.
However, non-licensed individuals may talk over a transceiver
if a licensed operator starts, supervises, ends the call and
makes the necessary log entries.
PRIVACY
•Information overheard but not intended for you cannot law-
fully be used in any way.
Keep a copy of the current government rules and regulations
handy.
•Indecent or profane language is prohibited.
RADIO LICENSES
(1) SHIP STATION LICENSE
You must have a current radio station license before using the
transceiver. It is unlawful to operate a ship station which is not
licensed.
Radio license for boaters (U.S.A. only)
The Telecommunications Act of 1996 permits recreational
boaters to have and use a VHF marine radio, EPIRB, and
marine radar without having an FCC ship station license.
Boaters traveling on international voyages, having an HF
single sideband radiotelephone or marine satellite terminal,
or required to carry a marine radio under any other regula-
tion must still carry an FCC ship station license. For further
information, see the FCC Ship Radio Stations Fact Sheet.
Inquire through your dealer or the appropriate government
agency for a Ship-Radiotelephone license application. This
government-issued license states the call sign which is your
craft’s identification for radio purposes.
1
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PANEL DESCRIPTION
2
■ Panel description
!
!
o
i
VHF MARINE
iM502
Function
display
DISTRESS
WATERPROOF
Speaker
DSC/ENT
POS
SCAN
CH/WX
DW U/I/C
16 9
TAG
q
LO/DX
HI/LO
SQL
IC SCR
POWER
VOL
w
e
r
t
y
u
q POWER SWITCH [POWER]
r TRANSMIT POWER SWITCH [HI/LO]
➥ Toggles high and low power when pushed. (p. 8)
•Some channels are set to low power only.
➥ While pushing this switch, other switches perform sec-
ondary functions.
Push to toggle the transceiver power ON and OFF.
w VOLUME CONTROL [VOL]
Adjusts the audio level. (p. 8)
e SQUELCH CONTROL [SQL]
t CHANNEL SELECTOR [CHANNEL]
➥ Rotate [CHANNEL] to select the operating channels, set
mode contents, etc. (p. 8)
Sets the squelch threshold level. (p. 8)
2
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PANEL DESCRIPTION
2
➥ While pushing [HI/LO], rotate [CHANNEL] to adjust the
i DISTRESS SWITCH [DISTRESS]
brightness of the LCD and switch backlight.
Transmits distress call when pushed for 5 sec. (p. 16)
y ATTENUATOR/INTERCOM/SCRAMBLER SWITCH
[LO/DX•IC•SCR]
o CHANNEL/DUALWATCH/TRI-WATCH SWITCH
[CH/WX•DW•U/I/C]
➥ Toggles the attenuator function ON and OFF when
pushed momentarily. (p. 8)
•“LOCAL” appears when the attenuator is in use. The order of
indication precedence is “LOCAL,” “SP OFF” and “CALL.”
➥ Activates an optional intercom function when pushed for
1 sec. (p. 29)
➥ Selects and toggles the regular channels and weather
channel when pushed momentarily. (pgs. 6, 7)
➥ While pushing [HI/LO], selects one of 3 regular channels
in sequence when pushed. (pgs. 6, 7)
•International, U.S.A. and Canadian channels are available for
regular channels.
➥ Calls optional HM-127 REMOTE-CONTROL MICROPHONE
when pushed and held while in intercom mode. (p. 29)
➥ While pushing [HI/LO], activates an optional voice
scrambler function. (p. 10)
➥ Starts dualwatch or tri-watch when pushed for 1 sec.
(p. 11)
➥ Stops dualwatch or tri-watch when either is activated.
! SCAN SWITCH [SCAN•TAG] (p. 13)
➥ Starts and stops normal or priority scan when tag chan-
nels are programmed.
•The optional voice scrambler function cannot be used on
channel 16 and 70.
u CHANNEL 16/CALL CHANNEL SWITCH [16•9]
➥ Selects channel 16 when pushed. (p. 6)
➥ Selects call channel when pushed for 1 sec. (p. 6)
•“CALL” appears when call channel is selected. “LOCAL” and
“SP OFF” indications have priority.
➥ Push [SCAN•TAG] for 1 sec. to set the displayed chan-
nel as a tag (scanned) channel.
➥ While pushing [HI/LO], push for 3 sec. to clear all tag
channels.
! DSC/POSITION SWITCH [DSC/ENT•POS]
➥ Selects the DSC menu when pushed. (p. 14)
➥ Shows current position and time from an optional GPS
receiver, etc. when pushed for 1 sec. (p. 15)
➥ Push for 3 sec. to enter call channel programming con-
dition when call channel is selected. (p. 9)
➥ While pushing [HI/LO], enters memory name program-
ming condition. (p. 9)
➥ Enters set mode when pushed while turning power ON.
(p. 30)
3
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PANEL DESCRIPTION
2
➥ “Low battery” flashes when the battery voltage drops to
approx. 10 V DC or below.
■ Function display
➥ “DUAL” appears during dualwatch; “TRI” appears dur-
ing tri-watch. (p. 11)
o
i
q
w
e
r
t SCRAMBLER INDICATOR (p. 10)
BUSY
25W
INT
Appears when an optional voice scrambler is activated.
CALL
u
TAG SC DUP
CALLING
y DUPLEX INDICATOR (p. 6)
Appears when a duplex channel is selected.
t y
u CHANNEL NUMBER READOUT
➥ Indicates the selected operating channel number. “A”
appears when a simplex channel is selected. (p. 6)
➥ In set mode, indicates the selected condition. (p. 30)
q BUSY/TRANSMIT INDICATOR (p. 8)
➥ “BUSY” appears when receiving a signal or when the
squelch opens.
i CHANNEL GROUP INDICATOR (p. 6)
➥ “TX” appears while transmitting.
Indicates whether an International (INT), U.S.A. (USA),
Canadian (CANADA) or weather (WX) channel is selected.
w POWER INDICATOR (p. 8)
➥ “25W” appears when high power is selected.
➥ “1W” appears when low power is selected.
o CALL CHANNEL INDICATOR
➥
“CALL” appears when the call channel is selected. (p. 6)
➥ “SP OFF” appears when the internal speaker is turned
OFF in set mode. (p. 32)
e TAG CHANNEL INDICATOR (p. 13)
Appears when a tag channel is selected.
➥ “LOCAL” appears when the attenuator is in use. (p. 8)
•The order of indication precedence is “LOCAL,” “SP OFF” and
“CALL.”
r CHANNEL NAME INDICATOR
➥ Channel comment appears if programmed. (p. 9)
4
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PANEL DESCRIPTION
2
■ Microphone
q
Speaker
Microphone
w
e
q PTT SWITCH [PTT]
Push and hold to transmit; release to receive. (p. 8)
w CHANNEL UP/DOWN SWITCHES [Y]/[Z]
Push either switch to change the operating memory chan-
nel, set mode contents, etc. (p. 8)
e TRANSMIT POWER SWITCH [HI/LO]
➥ Same as the [HI/LO] switch on the front panel. (p. 8)
➥ While pushing [HI/LO] on the supplied microphone, turn
power ON to toggle the lock function ON and OFF. (p. 7)
5
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BASIC OPERATION
3
➥ Push [16•9] for 1 sec. to select the call channel of the se-
lected channel group.
■ Channel selection
•“CALL” and call channel number appear.
•Each channel group may have an independent call channel after
changing a call channel.
Channel 16
Channel 16 is the distress and safety channel. It is used for
establishing initial contact with another station and for emer-
gency communications. Channel 16 is monitored during both
dualwatch and tri-watch. While standing by, you must monitor
channel 16.
➥ Push [CH/WX] to return to the condition before selecting
call channel, or rotate [CHANNEL] to select operating
channel.
➥ Push [16•9] momentarily to select channel 16.
➥ Push [CH/WX] to return to the condition before selecting
channel 16, or rotate [CHANNEL] to select operating chan-
nel.
INT
25W
CALL
Push for
1 sec.
16 9
TAG
CALLING
INT
25W
16 9
Push
U.S.A., Canadian and international channels
There are 57 U.S.A., 61 Canadian and 57 international chan-
nels. These channel groups may be specified for the operat-
ing area.
TAG
CALLING
Channel 9 (Call channel)
q Push [CH/WX] to select a regular channel.
•If a weather channel appears, push [CH/WX] again.
w Push [CH/WX•U/I/C] while pushing [HI/LO] to change the
channel group, if necessary.
Each regular channel group has a separate leisure-use call
channel. The call channel is monitored during tri-watch. The
call channels can be programmed (p. 9) and are used to store
your most often used channels in each channel group for
quick recall.
•U.S.A., International (INT) and Canadian channels can be se-
lected in sequence.
e Rotate the channel selector to select a channel.
•“DUP” appears for duplex channels.
•“A” appears for simplex channels.
6
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BASIC OPERATION
3
q Push [CH/WX] once or twice to select a weather channel.
•“WEATHER” appears when a weather channel is selected. “WX
ALT” appears when the weather alert function is in use. (p. 31)
w Rotate the channel selector to select a channel.
USA
•Channels are memorized separately for each channel group.
U.S.A. channels
WEATHER
CH/WX
HI/LO
Push
+
DW U/I/C
Push once
or twice
CH/WX
When weather alert is OFF.
CANADA
INT
DW U/I/C
WX ALT
DUP
Canadian channels
International channels
When weather alert is ON.
Weather channels
There are 10 weather channels. Used for monitoring weather
channels from the NOAA (National Oceanographic and At-
mospheric Administration) broadcasts.
■ Microphone lock function
The microphone lock function electrically locks the [Y]/[Z]
and [HI/LO] switches on the supplied microphone. This pre-
vents accidental channel changes and accidental function ac-
cess.
The transceiver can detect a weather alert tone on the se-
lected weather channel while receiving the channel, during
standby on a regular channel or while scanning. See
“Weather alert” on p. 31.
➥ While pushing [HI/LO] on the supplied microphone, turn
power ON to toggle the lock function ON and OFF.
7
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BASIC OPERATION
3
u Push and hold [PTT] to transmit, then speak into the mi-
■ Receiving and transmitting
crophone.
•“TX” appears.
CAUTION: Transmitting without an antenna may dam-
age the transceiver.
•Channel 70 cannot be used for transmission (for GMDSS use).
Simplex channels, 3, 21, 23, 61, 64, 81, 82 and 83 CAN-
NOT be lawfully used by the general public in U.S.A. wa-
ters.
q Push [POWER] to turn power ON.
w Set the audio and squelch levels.
➥ Rotate [SQL] fully counterclockwise in advance.
➥ Rotate [VOL] to adjust the audio output level.
➥ Rotate [SQL] clockwise until the noise disappears.
e To change the channel group, push [CH/WX•DW•U/I/C]
while pushing [HI/LO]. (p. 6)
i Release [PTT] to receive.
IMPORTANT: To maximize the readability of your trans-
mitted signal, pause a few sec. after pushing [PTT], hold
the microphone 4 to 6 inches (10 to 15 cm) from your
mouth and speak at a normal voice level.
r Rotate the channel selector or push [Y]/[Z] on the micro-
phone to select the desired channel.
•When receiving a signal, “BUSY” appears and audio is emitted
q y
e
u i
from the speaker.
VHF MARINE
iM502
•Further adjustment of [VOL] may be necessary at this point.
•Use the optional voice scrambler function for privacy. (p. 10)
t Push [LO/DX] to turn the receive attenuator ON or OFF if
necessary.
DISTRESS
WATERPROOF
DSC/ENT
SCAN
TAG
CH/WX
DW U/I/C
16
9
POS
•“LOCAL” appears when the receive attenuator is in use.
y Push [HI/LO] to select the output power if necessary.
•“25W” or “1W” appears when high or low power is selected, re-
spectively.
LO/DX
HI/LO
IC SCR
POWER
VOL
SQL
•Choose low power to conserve power, choose high power for
longer distance communications.
w
r
t
r
y
•Some channels are for low power only.
8
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BASIC OPERATION
3
■ Call channel programming
■ Channel names
The call channel is used to select channel 9, however, you
can program your most often-used channels in each channel
group for quick recall.
Memory channels can be tagged with alphanumeric names
of up to 10 characters each.
Capital letters, small letters, numerals, some symbols (! " # $
,
.
q While pushing [HI/LO], push [CH/WX•DW•U/I/C] one or
more times to select the desired channel group (U.S.A., In-
ternational, Canada) to be programmed.
w Push [16•9] for 1 sec. to select the call channel of the se-
lected channel group.
% & ' ( ) ✱ + – ⁄) and spaces can be used.
q Select the desired memory channel.
•Cancel dual watch, tri-watch or scan in advance.
w While pushing [HI/LO], push [16•9] to edit memory chan-
nel name.
•“CALL” and call channel number appear.
•The order of indication precedence is “LOCAL,” “SP OFF” and
“CALL.”
•A cursor appears and blinks.
INT
25W
e Push [16•9] again for 3 sec.
INT
(until long beep changes to
25W
CALL
TAG
TAG
2 short beeps) to enter call
channel programming con-
dition.
äLEASURE
CALLING
e Select the desired character by rotating the channel selec-
tor or by pushing [Y]/[Z] on the microphone.
•Push [SCAN] or [CH/WX] for cursor movement.
r Push [16•9] to input and set the name.
•Push [HI/LO] to cancel.
•Channel number starts flash-
INT
CALL
DUP
ing.
25W
r Rotate the channel selector
to select the desired chan-
nel.
t Push [16•9] to program the displayed channel as the call
channel.
TAG
INTL
•The cursor disappears.
t Repeat steps q to r to program other memory channel
names, if desired.
•Push [CH/WX] to cancel.
•The channel number stops flashing.
9
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BASIC OPERATION
3
■ Optional voice scrambler operation
Activating the scrambler
Programming scrambler codes
The optional voice scrambler provides private communica-
tions. In order to receive or send scrambled transmissions
you must first activate the scrambler function. To activate the
function, an optional UT-98 or UT-112 is necessary. See p. 33
for selecting the unit. Ask your dealer for details.
There are 128 or 32 codes (0 to 127 or 1 to 32) available for
programming when the optional UT-98 or UT-112 is installed.
In order to understand one another, all transceivers in your
group must have the same scramble code. This function may
not be available depending on dealer setting.
The scrambler function automatically turns OFF when
channel 16 or 70 is selected.
q Turn power OFF.
w While pushing [16•9], turn power ON to enter set mode.
e After the display appears, release [16•9].
r Push [16•9] one or more times to select the scrambler
code item.
q Select an operating channel other than channel 16 and 70.
w While pushing [HI/LO], push [LO/DX•IC/SCR] to toggle an
optional scrambler function ON or OFF.
•“SC” appears.
•“Scrambler code” appears.
t Rotate the channel selector to select the desired scram-
bler code.
y Turn power OFF, then ON again to exit set mode.
e To turn the scrambler function OFF, repeat step w.
•“SC” disappears.
[Example]: Programming scrambler code 127.
POWER
+
16 9
16 9
Set mode
Beep
Set mode
Set mode
Push one or
more times.
Enter set mode
Scrambler
code
Scrambler
code
Select code
Set mode
Scrambler code item
10
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DUAL WATCH/TRI-WATCH
4
■ Description
■ Operation
Dualwatch monitors channel 16 while you are receiving an-
other channel; tri-watch monitors channel 16 and the call
channel while receiving another channel.
q Select the desired operating channel.
w Select dualwatch or tri-watch in set mode. (p. 31)
e Push [CH/WX•DW•U/I/C] for 1 sec. to start dualwatch or
tri-watch.
•
“DUAL” appears during dualwatch; “TRI” appears during tri-watch.
•Beep tone sounds when a signal is received on channel 16.
r To cancel dualwatch/tri-watch, push [CH/WX•DW•U/I/C]
again.
DUALWATCH/TRI-WATCH SIMULATION
Call channel
[Example]: Operating tri-watch on INT channel 25.
INT
Tri-watch starts.
25W
TAG
TRI
DUP
16
BUSY
25W
TAG
TRI
INT
Signal is received
on call channel.
CALL
Dualwatch
Tri-watch
16
•If a signal is received on channel 16, dualwatch/tri-watch pauses
on channel 16 until the signal disappears.
BUSY
25W
TAG
TRI
INT
Signal received on
channel 16 takes
priority.
DUP
16
•If a signal is received on the call channel during tri-watch, tri-
watch becomes dualwatch until the signal disappears.
•To transmit on the selected channel during dualwatch/tri-watch,
push and hold [PTT].
INT
Tri-watch resumes
after the signal
disappears.
25W
TAG
TRI
DUP
16
11
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SCAN OPERATIONS
5
■ Scan types
Scanning is an efficient way to locate signals quickly over a
wide frequency range. The transceiver has priority scan and
normal scan.
Set the tag channels (scanned channel) before scanning.
Clear the tag channels which inconveniently stop scanning,
such as digital communication use.
When the weather alert function is in use, the selected
weather channel is checked while scanning. (p. 31)
Choose priority or normal scan in set mode. (p. 31)
PRIORITY SCAN
NORMAL SCAN
CH 01
CH 02
CH 01
CH 02
CH 06
CH 03
CH 06
CH 16
CH 03
CH 05
CH 04
CH 05
CH 04
Priority scan searches through all tag channels in se-
quence while monitoring channel 16. When a signal is de-
tected on channel 16, scan pauses until the signal disap-
pears; when a signal is detected on a channel other than
channel 16, scan becomes dualwatch until the signal dis-
appears.
Normal scan, like priority scan, searches through all tag
channels in sequence. However, unlike priority scan, chan-
nel 16 is not checked unless channel 16 is set as a tag
channel.
12
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SCAN OPERATION
5
■ Setting tag channels
■ Starting a scan
For more efficient scanning, add desired channels as tag
channels or clear tag channels for unwanted channels. Chan-
nels set as non-tag channels will be skipped during scanning.
Tag channels can be assigned to each channel group
(U.S.A., International, Canada) independently.
Set scan type (priority or normal scan) and scan resume timer
in advance using set mode. (p. 31)
q Set tag channels as described at left.
w Make sure the squelch is closed to start a scan.
e While pushing [HI/LO], push [CH/WX•DW•U/I/C] one or
more times to select the desired channel group, if desired.
r Push [SCAN] to start priority or normal scan.
•“Pri scan 16” or “Normal scan” appears in the function display.
•When a signal is detected, scan pauses until the signal disap-
pears or resumes after pausing 5 sec. according to set mode set-
ting. (Channel 16 is still monitored during priority scan.)
•Rotate the channel selector to check the scanning tag channels,
to change the scanning direction or resume the scan manually.
•“16” flashes and a beep tone sounds when a signal is received
on channel 16 during priority scan.
q While pushing [HI/LO], push [CH/WX•DW•U/I/C] one or
more times to select the desired channel group, if desired.
w Select the desired channel to set as a tag channel.
e Push [SCAN•TAG] for 1 sec. to set the displayed channel
as a tag channel.
•“TAG” appears in the function display.
r To cancel the tag channel setting, repeat e.
•“TAG” disappears.
•Clearing all tag channels in the selected channel group
➥ While pushing [HI/LO], push [SCAN•TAG] for 3 sec. to
clear all tag channels in the channel group.
•Push [SCAN•TAG] for 1 sec. to set the paused channel as a tag
channel.
t To stop the scan, push [SCAN].
[Example]: Starting a normal scan.
Push
INT
INT
DUP
BUSY
25W
INT
DUP
SCAN
TAG
25W
25W
TAG
TAG
DUP
TAG
INTL
Normal scan
Normal scan
Scan starts.
When a signal is received
13
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DSC OPERATION
6
■ MMSI code programming
■ Position and time programming
The 9-digit MMSI (DSC self ID) code can be programmed at
power ON.
A distress call should include the ship’s position and time. If
no GPS is connected, your position and UTC (Universal Time
Coordinated) time should be input. They are included auto-
matically when a GPS receiver (NMEA0183 ver. 2.0) is con-
nected.
This function is not available when the MMSI code has
been programmed by the dealer. This code programming
can be performed only 2 times.
This function is not available when an optional GPS re-
ceiver (NMEA0183 ver. 2.0) is connected.
q Turn power OFF.
w While pushing [DSC/ENT], turn power ON to enter MMSI
code programming condition.
q Push [DSC/ENT] twice to enter the position programming
e After the display appears, release [DSC/ENT].
condition.
Set MMSI
Input POS
LAT: °
LON:
Null˘[H/L]
'
°
'
ä23456789
r Select the desired number by rotating the channel selector.
t Push [CH/WX] to advance the cursor.
w Rotate the channel selector to select the digit of your posi-
tion.
•Push [SCAN] to move the cursor backward.
e Push [CH/WX] to advance the cursor.
•Push [SCAN] to move the cursor backward.
•Push [HI/LO] to clear the position data.
y Repeat steps r and t to input 9 digit code.
u Push [DSC/ENT] to input and set the code.
•The previously selected channel appears.
14
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DSC OPERATION
6
r Push [DSC/ENT] to set the position and advance to time
setting condition.
■ Position indication
•Push [LO/DX] to abandon the setting and exit the condition.
When an optional GPS receiver (NMEA0183 ver. 2.0) is con-
nected, the transceiver can display the current position and
time. When no GPS receiver is connected, the transceiver
displays the manually entered position and time.
Input time
UTC: :
Null˘[H/L]
A GPS receiver appropriate for the IC-M502 is not supplied
from Icom. An NMEA0183 ver. 2.0 is required for position in-
dication. Ask your dealer about the GPS receiver.
t Rotate the channel selector to select the digit of current
UTC time.
y Push [CH/WX] to advance the cursor.
•Push [SCAN] to move the cursor backward.
•Push [HI/LO] to clear the time.
➥ Push [DSC/ENT•POS] for 1 sec. to display the current po-
sition and time.
•“MNL” (manual) appears instead of the “GPS” indication when
u Push [DSC/ENT] to set the time.
•Push [LO/DX] to abandon the setting and exit the condition.
the position data is entered manually.
LAT: 34°34'N
LON:135°34'E
GPS UTC12:34
CALLING
15
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DSC OPERATION
6
■ Distress call
A distress call should be transmitted if, in the opinion of the
Master, the ship or a person is in distress and requires imme-
diate assistance.
Distress
Completed
Wait for ACK
r When receiving the acknowledgment, reply to the con-
NEVER USE THE DISTRESS CALL WHEN
YOUR SHIP IS NOT IN AN EMERGENCY. A
DISTRESS CALL CAN BE USED ONLY WHEN
IMMEDIATE HELP IS NEEDED.
nected station via the microphone.
Received
Distress ACK
< Tokyo CG
q Confirm any distress call is not being received.
w While lifting up the switch cover, push the [DISTRESS]
switch for 5 sec. to transmit the distress call.
•An emergency channel (Ch 70) is automatically selected and the
distress call is transmitted.
➥ Distress alert contains (default);
•Kinds of distress: Undesignated distress
•Position data
: GPS or manual input position data held for
23.5 hrs. or until the power is turned OFF.
•If no GPS is connected, input your position and UTC time, if pos-
sible.
➥ The distress call is repeated every 3.5–4.5 min., until re-
ceiving an ‘acknowledgement.’
➥ Push [DISTRESS] to transmit a renewed distress call, if
desired.
➥ Push [16•9] to cancel the ‘Call repeat’ mode.
➥ ‘??’ may blink instead of position and time indications,
when the GPS data is invalid, or 4 hours after the time
data is input manually.
Distress TX
LAT: 35°23'N
LON:135°35'E
GPS UTC12:34
e After transmitting the call, the transceiver waits for an ac-
knowledgment call on Ch70.
•The distress call is automatically transmitted every 3.5 to 4.5
minutes.
16
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DSC OPERATION
6
t Push [DSC/ENT] to transmit the individual call.
■ Transmitting DSC calls
•Channel 70 is selected and the individual call is transmitted to
the selected station.
Transmitting individual call
The individual call function allows you to transmit a DSC sig-
nal to a specific party only.
•If channel 70 is busy, the transceiver standbys until the channel
becomes clear.
•Routine category only is available.
q Select a desired channel other than channel 70.
w Push [DSC/ENT] to select the DSC menu.
To call,
[DSC/ENT]
To cancel
[other]
Individual
Ch70 is BUSY
To cancel
[other]
Sel item
˘Individual
INDV ACK
Push [DSC/ENT] to transmit DSC call. When Ch70 is busy.
All ships
y Standby on channel 70 until an acknowledgement is re-
ceived.
e Rotate the channel selector to select “individual” and push
[DSC/ENT].
Individual
Completed
r Rotate the channel selector to select the desired pre-pro-
grammed individual address; or push [DSC/ENT] while
“Manual set” is displayed, to set the ID code for the indi-
vidual you wish to call.
Wait for ACK
•The ID code for the individual call can be set in advance. (p. 22)
u When the acknowledgement is received, the display
changes to the previously selected user channel with
beeps.
i Push and hold [PTT] to communicate your message to the
responding party.
Sel address
˘Manual set
Icom
John
17
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DSC OPERATION
6
Transmitting individual acknowledgement
Transmit an acknowledgement (‘able to comply’ or ‘unable to
Comply
˘Able
comply’) when an individual call for you is received.
Unable
q Select a desired channel other than channel 70.
w Push [DSC/ENT] to select the DSC menu.
e Rotate the channel selector to select “INDV ACK” and
push [DSC/ENT].
y If you select ‘Unable,’ select the reason by rotating the
channel selector, then push [DSC/ENT].
•‘No reason given,’ ‘Congestion,’ ‘Busy,’ ‘Queue indication,’
‘Barred (Station barred),’ ‘No operator,’ ‘No Equip (Equipment
disable),’ ‘No channel (Unable channel)’ and ‘No mode (Unable
mode)’ are available.
•“INDV ACK” appears after an individual call is received.
Sel item
Individual
˘INDV ACK
All ships
Reason
˘No reason
Congestion
Busy
r Rotate the channel selector to select the desired individ-
ual address or ID code, then push [DSC/ENT].
u Push [DSC/ENT] to transmit the acknowledgement to the
Sel address
˘Icom
selected station.
John
To call,
[DSC/ENT]
To cancel
[other]
t Rotate the channel selector to select an acknowledgement
(‘Able’ or ‘Unable’), then push [DSC/ENT].
i The individual acknowledgement has been transmitted.
18
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DSC OPERATION
6
t The all ships call has been transmitted.
Transmitting all ships call
Large ships use channel 70 as their “listening channel.” When
you want to announce a message to these ships, use the “all
ships call” function.
All ships
Completed
q Select a desired channel other than channel 70.
w Push [DSC/ENT] to select the DSC menu.
e Rotate the channel selector to select “All ships” and push
[DSC/ENT].
y Push [PTT] or rotate the channel selector to exit the condi-
tion.
Sel item
Individual
INDV ACK
˘All ships
r Push [DSC/ENT] to transmit the all ships call.
•Channel 70 is selected and the all ships call is transmitted.
•Routine category only is available.
To call,
[DSC/ENT]
To cancel
[other]
19
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DSC OPERATION
6
Transmitting position request call
Transmit a position request call when you want to know your
POS REQ
Completed
friend’s current position, etc.
Wait for ACK
q Select a desired channel other than channel 70.
w Push [DSC/ENT] to select the DSC menu.
e Rotate the channel selector to select “POS request” and
push [DSC/ENT].
y Push [PTT] or rotate the channel selector to exit the condi-
tion.
Sel item
Transmitting position reply call
Transmit a position reply call when a position request call is
received.
INDV ACK
All ships
˘POS request
q When a position request call is received, the function dis-
r Push [DSC/ENT] to transmit the position request call.
•Channel 70 is selected and the position request call is transmit-
ted.
play shows as follows.
Received
POS request
< Icom
To call,
[DSC/ENT]
To cancel
[other]
Ans[DSC/ENT]
w Push [DSC/ENT] to reply the position request call; push
[HI/LO] to ignore the position request call.
t The position request call has been transmitted.
20
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DSC OPERATION
6
r The position information appears. Set the current position,
then push [DSC/ENT].
■
Setting the distress information
•Rotate the channel selector to select the character.
The nature of the distress call should be included in the dis-
tress call.
•Push [CH/WX] to advance the cursor.
•Push [SCAN] to move the cursor backward.
•Push [HI/LO] to clear the position data.
q Push [DSC/ENT] to select the DSC menu.
w Rotate the channel selector to select “DTRS set” and push
[DSC/ENT].
Input POS
LAT: °
LON:
Null˘[H/L]
'
°
'
Sel item
RCV calls
˘DTRS set
Set-up
t The time information appears. Set the current time, then
push [DSC/ENT].
•Rotate the channel selector to select the numeral.
e Rotate the channel selector to select the nature of the dis-
tress, then push [DSC/ENT].
•Push [CH/WX] to advance the cursor.
•Push [SCAN] to move the cursor backward.
•Push [HI/LO] to clear the time data.
•‘Undesign (Undesigned),’ ‘Explosion,’ ‘Flooding,’ ‘Collision,’
‘Grounding,’ ‘Capsizing,’ ‘Sinking,’ ‘Adrift (Disable adrift),’ ‘Aban-
doning (Abandoning ship),’ ‘Piracy (Piracy attack),’ ‘MOB (Man
overboard)’ and ‘EPIRB (EPIRB emission)’ are available.
Input time
UTC: :
Sel nature
Undesign
Null˘[H/L]
˘Explosion
Flooding
y Push [DISTRESS] for 5 sec. to transmit the distress call.
•Push [DSC/ENT] to exit the condition.
•The selected nature of the distress is stored for 10 minutes.
21
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DSC OPERATION
6
■ DSC individual ID
Add ID
ID:
A total of 40 DSC address ID’s can be programmed and
named with up to 10 characters.
NAME:
Programming address ID
q Push [DSC/ENT] to select the DSC menu.
w Rotate the channel selector to select “Set-up” and push
[DSC/ENT].
t Push [DSC/ENT] to program and to exit the condition.
Deleting address ID
q Push [DSC/ENT] to select the DSC menu.
w Rotate the channel selector to select “Set-up” and push
[DSC/ENT].
Sel item
RCV calls
DTRS set
˘Set-up
Sel item
RCV calls
DTRS set
˘Set-up
e Rotate the channel selector to select ‘Add ID,’ then push
[DSC/ENT].
Set-up
e Rotate the channel selector to select ‘Delete ID,’ then push
[DSC/ENT].
˘Add ID
Delete ID
Offset time
•When no address ID is programmed, the transceiver exits the
condition automatically.
Set-up
r Set the distress ID and ID name, then push [DSC/ENT].
•Rotate the channel selector to select the character.
•Push [CH/WX] to advance the cursor.
Add ID
˘Delete ID
Offset time
•Push [SCAN] to move the cursor backward.
•Push [HI/LO] to cancel and exit the condition.
22
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DSC OPERATION
6
r Select the desired ID name with the channel selector, then
■ Receiving DSC calls
push [DSC/ENT].
Receiving a distress call
Delete ID
˘Icom2
John
While monitoring channel 70 and a distress call is received:
➥ Emergency alarm sounds for 2 minutes.
•Push any switch to stop the alarm.
Smith
➥ “Received Distress” appears in the display; then, channel
16 is automatically selected.
➥ Continue monitoring channel 16 as a coast station may re-
quire assistance.
t Push [DSC/ENT] to delete the address ID; push other
switch to exit the condition.
Received
Distress
< Smith
Receiving a distress acknowledgement
While monitoring channel 70 and a distress acknowledge-
ment to other ship is received:
➥ Emergency alarm sounds for 2 minutes.
•Push any switch to stop the alarm.
➥ “Received Distress ACK” appears in the display; then,
channel 16 is automatically selected.
Received
Distress ACK
< Tokyo CG
> Smith
23
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DSC OPERATION
6
Receiving a distress relay acknowledgement
While monitoring channel 70 and a distress relay acknowl-
edgement is received:
➥ Emergency alarm sounds for 2 minutes.
•Push any switch to stop the alarm.
Receiving an all ships call
While monitoring channel 70 and an all ships call is received:
➥ Emergency alarm sounds when the category is “Distress”
or “Urgency;” 3 beeps sound for other categories.
➥ “All ships Distress,” “All ships Safety” or “All ships Urgency”
appears in the display; then, the channel specified by the
calling station is automatically selected for voice communi-
cation.
➥ “Received DTRS RLY ACK” appears in the display; then,
channel 16 is automatically selected.
Received
➥ Monitor the selected channel for an announcement from
the calling vessel.
DTRS RLY ACK
< Tokyo CG
> Icom2
Received
All ships
Safety
Receiving a distress relay call
While monitoring channel 70 and a distress relay call is re-
ceived:
< Icom3
➥ Emergency alarm sounds for 2 minutes.
•Push any switch to stop the alarm.
Receiving an individual call
While monitoring channel 70 and an individual call is re-
➥ “Received Distress RLY” appears in the display; then,
channel 16 is automatically selected.
➥ Monitor channel 16 until the emergency communication
has been completed.
ceived:
➥ Emergency alarm or beeps sound depending on the re-
ceived category.
➥ “Individual Distress,” “Individual Safety,” “Individual Ur-
gency” or “Individual Routine” appears in the display.
➥ The channel specified by the calling station is automatically
selected for checking the channel condition.
Received
Distress RLY
< Icom2
> Tokyo CG
24
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DSC OPERATION
6
Receiving a position reply call
While monitoring channel 70 and a position reply call (for the
area you are in) is received:
Received
Individual
Routine
➥ “Received POS” appears in the display.
< Icom3
Received POS
< TOM
Receiving a geographical area call
While monitoring channel 70 and a geographical area call (for
the area you are in) is received:
LAT: 34°34'N
LON:135°34'E
➥ Emergency alarm or beeps sound depending on the re-
ceived category.
When no GPS receiver is connected or if there is a prob-
lem with the connected receiver, all geographical area calls
are received, regardless of your position.
➥ “Geographic Distress,” “Geographic Safety,” “Geographic
Urgency” or “Geographic Routine” appears in the display;
then, the channel specified by the calling station is auto-
matically selected for voice communications.
➥ Monitor the selected channel for an announcement from
the calling ship.
Receiving a position request call
While monitoring channel 70 and a position request call (for
the area you are in) is received:
➥ “POS request” appears in the display.
➥ Push [DSC/ENT] to reply to the call.
Received
Geographic
Routine
Received
< Tokyo CG
POS request
< Smith
Ans[DSC/ENT]
When no GPS receiver is connected or if there is a prob-
lem with the connected receiver, all geographical area calls
are received, regardless of your position.
When no GPS receiver is connected or if there is a prob-
lem with the connected receiver, all geographical area calls
are received, regardless of your position.
25
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DSC OPERATION
6
r Set the offset time from the UTC (Universal Time Coordi-
nated) time, then push [DSC/ENT].
■ DSC set mode
•Rotate the channel selector to select the number, ‘+’ or ‘–.’
Offset time
•Push [CH/WX] to advance the cursor.
This item sets the offset time from the UTC (Universal Time
Coordinated) time.
•Push [SCAN] to move the cursor backward.
•Push [HI/LO] to cancel and exit the condition.
q Push [DSC/ENT] to select the DSC menu.
w Rotate the channel selector to select “Set-up” and push
[DSC/ENT].
Offset time
00:00
Offset time
-12:00
Sel item
RCV calls
DTRS set
˘Set-up
No offset time (default)
–12 hours
t Push [DSC/ENT] to program and to exit the condition.
e Rotate the channel selector to select ‘Offset time,’ then
push [DSC/ENT].
Set-up
Add ID
Delete ID
˘Offset time
26
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DSC OPERATION
6
MMSI code check
The 9-digit MMSI (DSC self ID) code can be checked in set
mode.
q Push [DSC/ENT] to select the DSC menu.
w Rotate the channel selector to select “Set-up” and push
[DSC/ENT].
Sel item
RCV calls
DTRS set
˘Set-up
e Rotate the channel selector to select ‘MMSI check,’ then
push [DSC/ENT].
Set-up
Delete ID
Offset time
˘MMSI check
r Check the 9-digit MMSI (DSC self ID) code.
MMSI check
123456789
t Push [DSC/ENT] to exit the condition.
27
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DSC OPERATION
6
t Rotate the channel selector to scroll the message.
•The stored message has several information and depends on the
distress call types.
■ Receive messages
The transceiver automatically stores up to 20 distress mes-
sages and 20 other messages. The messages can be used
as an assistance to the logbook.
Sel DTRS MSG
˘Smith
Sel Massage
˘All ships
Individual
Individual
Icom2
John
q Push [DSC/ENT] to select the DSC menu.
w Rotate the channel selector to select “RCV calls” and push
[DSC/ENT].
Distress
All ships
< Bill
< Smith
Explosion
UTC: 12:34
LAT: 12°34'N
LON:123°45'W
Safety
•“RCV calls” does not appear until a distress call is received.
F3E Simplex
CH13
Sel item
˘RCV calls
DTRS set
Set-up
To clear
To clear
this data
No [DSC/ENT]
Yes [H/L]
this data
No [DSC/ENT]
Yes [H/L]
e Rotate the channel selector to select distress messages or
y Push [DSC/ENT] to exit the condition or push [HI/LO] to
other messages, then push [DSC/ENT].
clear the displayed messages.
Sel Message
˘Distress
Other
To clear
this data
No [DSC/ENT]
Yes [H/L]
r Rotate the channel selector to select the desired message,
then push [DSC/ENT].
28
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INTERCOM OPERATION
7
•To adjust the HM-127’s speaker output level, push [Y]/[Z] after
■ Intercom operation
pushing [VOL].
The optional intercom function allows you to talk to the deck
from the cabin. The optional HM-127 REMOTE-CONTROL MI-
CROPHONE is required for intercom operation.
INT
INT
Intercom
TALK
Connect an optional HM-127 as described on p. 35.
•Transmitting is impossible during intercom operation.
•The received signal is muted during intercom operation.
IC-M502 (caller)
HM-127 (listener)
r After releasing the PTT switch you can hear the response
through the speaker.
t To return to normal operation, push [LO/DX•IC•SCR] mo-
mentarily.
q Push [LO/DX•IC•SCR] for 1 sec. to enter intercom mode.
•The HM-127 power is automatically turned ON, even if the power
is OFF.
•Other switches also turn the function OFF, however, the corre-
sponding function is then activated e.g. pushing [16•9] selects
channel 16.
INT
INT
Intercom
•While in the intercom mode, the transceiver functions
(transmit and receive) are interrupted. If the transceiver is
in transmit condition, the intercom function is not avail-
able.
•When a DSC call is received, “DSC received” appears
and the last received DSC message is displayed after the
intercom use is finished.
IC-M502
HM-127
w Push and hold [LO/DX•IC•SCR] again to call up.
•The transceiver and microphone emit call beeps.
e Push and hold the PTT switch and speak at a normal voice
level into the microphone.
•“TALK” or “LSTN” appears on the caller or listener function dis-
•When a WX alert is received, “WX ALT” flashes and a
beep sounds. The WX alert sounds after the intercom use
is finished.
play, respectively.
•To adjust the IC-M502’s speaker output level, rotate [VOL].
29
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SET MODE
8
■ Set mode programming
Set mode is used to change the conditions of the trans-
ceiver’s functions: scan mode (normal or priority), scan re-
sume timer, weather alert, dualwatch/tri-watch selection, DSC
watch, transceiver’s beep tone, internal speaker (transceiver
or HM-127), LCD contrast (transceiver or HM-127), RF atten-
uation level, scrambler code and scrambler type.
•Available functions may differ depending on dealer set-
ting.
q Turn power OFF.
w While pushing [16•9], turn power ON to enter set mode.
e After the display appears, release [16•9].
r Push [16•9] to select the desired item, if necessary.
t Rotate the channel selector to select the desired condition
of the item. Use [Y]/[Z] when using an optional HM-127.
y Turn power OFF, then ON again to exit set mode.
•The optional HM-127 has it’s own settings for the beep
tone and LCD contrast.
•SET MODE CONSTRUCTION
Scan mode
Scan resume timer
Weather alert
Dual/tri watch
DSC watch
Scan mode
Scan timer
WX alert
DUAL/TRI
DSC watch
Beep tone
16 9
Push
Beep
Attenuation level
Scrambler type
Scrambler code
LCD contrast
Internal speaker
Attenuation
level
Scrambler
type
Scrambler
code
LCD
contrast
Internal
speaker
30
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SET MODE
8
Weather alert
■ Set mode items
An NOAA broadcast station transmits a weather alert tone be-
fore important weather information. When the weather alert
function is turned ON, the transceiver detects the alert, then
flashes the “WX ALT” indicator until the transceiver is oper-
ated. The previously selected (used) weather channel is
checked any time during standby or while scanning.
•“WX ALT” appears instead of “WEATHER” indication when the func-
tion is set ON.
Scan mode
The transceiver has 2 scan modes: normal scan and priority
scan. Normal scan searches all tag channels in the selected
channel group. Priority scan searches all tag channels in se-
quence while monitoring channel 16.
Set mode
Set mode
WX alert
Scan mode
Normal scan (default)
Priority scan
Weather alert OFF (default)
Weather alert ON
Scan resume timer
The scan resume timer can be selected as a pause (OFF) or
timer scan (ON). When OFF is selected, the scan pauses
until the signal disappears. When ON is selected, the scan
pauses 5 sec. and resumes even if a signal is being received
on channels except for channel 16.
Dual/tri watch
This item sets the [CH/WX•DW] switch function as dual watch
or tri-watch.
See the section ‘Dual watch/Tri-watch’ for details.
Set mode
Set mode
DUAL/TRI
Scan timer
Scan timer OFF (default)
Scan timer ON
Dual watch (default)
Tri-watch
31
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SET MODE
8
DSC watch
Set mode
Beep
DSC watch monitors channel 70 while you are receiving an-
other channel.
If a distress signal is received on channel 70, the transceiver
monitors channel 16 and 70 alternately until the distress sig-
nal disappears. If a signal is received on another channel,
DSC watch pauses until the signal disappears.
Beep tone ON (default)
Beep tone OFF
Internal speaker
When an optional external speaker is connected and the
transceiver’s internal speaker is not required, the speakers
on the transceiver and microphone can be deactivated.
Set mode
DSC watch
“SP OFF” appears on the function display when the internal
speaker is turned OFF.
DSC watch ON (default)
DSC watch OFF
•The order of indication precedence is “LOCAL,” “SP OFF” and
This function may not be available for some channel
groups depending on dealer setting.
“CALL.”
Set mode
Beep tone
Internal
speaker
You can select silent operation by turning beep tones OFF or
you can have confirmation beeps sound at the push of a
switch by turning beep tones ON.
Internal speaker ON (default)
Internal speaker OFF
The optional HM-127 has it’s own setting for the beep tone.
32
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SET MODE
8
LCD contrast
This item adjusts the contrast of the LCD in 8 steps.
Scrambler code
When an optional scrambler unit is connected, the scrambler
code can be set depending on dealer setting.
Set mode
When the UT-98 or UT-112 is installed, 128 or 32 codes (0 to
127 or 1 to 32) can be selected, respectively.
LCD
contrast
LCD contrast 4 (default)
Set mode
Scrambler
code
The optional HM-127 has it’s own setting for the beep tone.
Scrambler code 0 (UT-98 default)
Scrambler code 127
Attenuation level
This item sets the receive attenuation level for the attenuator
function from 3 levels.
Scrambler type
When an optional scrambler unit is connected, the scrambler
type can be selected in set mode depending on dealer set-
ting.
Set mode
Attenuation
level
Set mode
Attenuation level 1 (default)
Scrambler
type
UT-98 scrambler unit
UT-112 scrambler unit
33
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CONNECTIONS AND MAINTENANCE
9
■ Supplied accessories
■ Antenna
The following accessories are supplied:
Qty.
A key element in the performance of any communication sys-
tem is an antenna. Ask your dealer about antennas and the
best places to mount them.
q Mounting bracket ............................................................ 1
w Microphone hanger (OPC-562) ...................................... 1
e Mic hanger screws (3 × 16) ............................................ 2
r Mounting screws (5 × 20) ............................................... 2
t Flat washers (M5) ........................................................... 2
y Spring washers (M5) ...................................................... 2
u Mounting bracket knobs ................................................. 2
i DC power cable (OPC-946) ........................................... 1
■ Fuse replacement
One fuse is installed in the supplied DC power cable. If a fuse
blows or the transceiver stops functioning, track down the
source of the problem, if possible, and replace the damaged
fuse with a new, rated one.
q
w
e
r
Fuse rating: 10 A
■ Cleaning
If the transceiver becomes dusty or dirty, wipe it clean with a
soft, dry cloth.
t
y
i
u
AVOID the use of solvents such as benzene or al-
cohol, as they may damage transceiver surfaces.
34
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CONNECTIONS AND MAINTENANCE
9
r GPS RECEIVER JACK
■ Connections
Connects to an optional GPS receiver to input the position
data and time data.
•A GPS receiver appropriate for the IC-M502 is not supplied from
Icom. An NMEA0183 ver. 2.0 is required for position or time indi-
cation, etc. Ask your dealer about the GPS receiver.
t
r
q
RCA
NMEA (+)
NMEA (–)
e
t EXTERNAL SPEAKER JACK
w
Connects to an external speaker. See ‘Options’ on p. 43
for available external speakers.
MICROPHONE HANGER
Rest the supplied microphone on the hanger when not in
use.
q DC POWER CONNECTOR
Connects the supplied DC power cable from this connector
to an external 12 V DC power source.
CAUTION: After connecting the DC power cable, GPS
receiver jack and external speaker jack, cover the connec-
tor and jacks with an adhesion tape as shown below to
prevent water seeping into the transceiver.
w EXTERNAL MICROPHONE JACK
Connects to optional HM-127 REMOTE-CONTROL MICRO-
PHONE.
e ANTENNA CONNECTOR
Adhesion
tape
Connects a marine VHF antenna with a PL-259 connector
to the transceiver.
CAUTION: Transmitting without an antenna may dam-
age the transceiver.
35
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CONNECTIONS AND MAINTENANCE
9
•OVERHEAD MOUNTING
■ Mounting the transceiver
Using the supplied mounting bracket
The universal mounting bracket supplied with your transceiver
allows overhead or dashboard mounting.
•Mount the transceiver securely with the 2 supplied screws
(M5 × 20) to a surface which is more than 10 mm thick and
can support more than 5 kg.
•Mount the transceiver so that the face of the transceiver is at
90° to your line of sight when operating it.
CAUTION: KEEP the transceiver and microphone at
least 1 meter away from your vessel’s magnetic navigation
compass.
•MOUNTING ON DASHBOARD
NOTE: Check the installation angle; the function display
may not be easy-to-read at some angles.
36
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CONNECTIONS AND MAINTENANCE
9
r Attach the clamps on either side of the IC-M502.
Using the optional mounting bracket
An optional MB-75 FLUSH MOUNT is available for mounting
• Make sure that the clamps align parallel to the IC-M502’s body.
the transceiver to a flat surface such as an instrument panel.
CAUTION: KEEP the transceiver and microphone at
least 1 meter away from your vessel’s magnetic navigation
compass.
q Using the template on the last page, carefully cut a hole
into the instrument panel (or wherever you plan to mount
the controller).
w Slide the transceiver through the hole as shown below.
t Tighten the end bolts on the clamps (rotate clockwise) so
that the clamps press firmly against the inside of the in-
strument control panel.
y Tighten the locking nuts (rotate counterclockwise) so that
the IC-M502 is securely mounted in position as below.
u Connect the antenna and control cable, then return the in-
strument control panel to its original place.
e Attach the 2 supplied bolts (M5 × 8 mm) on either side of
the IC-M502.
37
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CONNECTIONS AND MAINTENANCE
9
■ Optional unit installation
CAUTION: DISCONNECT the DC power cable from the
transceiver before performing any work on the transceiver.
Otherwise, there is danger of electric shock and/or equip-
ment damage.
w Remove the 4 screws from the shielding plate, then lift up
the shielding plate.
e Plug an optional unit to J6 on the MAIN unit as shown
below.
Follow the case opening procedure shown here when you
want to install an optional unit, etc.
q Remove the 6 screws as shown below and open the trans-
ceiver.
Optional unit
r Return the shielding plate and assemble the units to their
original positions.
38
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CONNECTIONS AND MAINTENANCE
9
■ Dimensions
145.0 (5 23⁄32˝)
31.4
53.0
165.0 (6 1⁄2˝)
(1 1⁄4˝) (2 3⁄32˝)
Unit: mm (inch)
39
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TROUBLESHOOTING
10
PROBLEM
POSSIBLE CAUSE
SOLUTION
REF.
No power comes ON.
•Bad connection to the power supply.
•Check the connection to the transceiver.
p. 35
No sound comes from
the speaker.
•Squelch level is too deep.
•Volume level is too low.
•Speaker has been exposed to water.
•Internal speaker is turned OFF.
•Set squelch to the threshold point.
•Set [VOL] to a suitable level.
•Drain water from the speaker.
p. 8
p. 8
—
•Turn the internal speaker ON in set mode.
p. 32
Sensitivity is low.
•The attenuator is activated.
•Push [LO/DX] to turn the function OFF.
•Change channels.
p. 8
Transmitting is impossi- •Some channels are for low power or re-
ble, or high power can- ceive only.
not be selected.
pgs.
6, 41
p. 8
•The output power is set to low.
•Push [HI/LO] to select high power.
Scan does not start.
•“TAG” channel is not programmed.
•Set the desired channels as “TAG” chan-
nels.
p. 13
No beep sounds.
•Beep tone is turned OFF.
•The squelch is open.
•Turn the beep tone ON in set mode.
•Set squelch to the threshold point.
p. 32
p. 8
Receive signal cannot
be understood.
•Optional voice scrambler is turned OFF.
•Scramble code is not set correctly.
•Turn the optional voice scrambler ON.
•Reset the scramble code.
p. 10
p. 33
Distress call cannot be
transmitted.
•MMSI (DSC self ID) code is not pro-
grammed.
•Program the MMSI (DSC self ID) code.
p. 14
40
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CHANNEL LIST
11
Channel number Frequency (MHz)
USA INT CAN Transmit Receive
Channel number Frequency (MHz)
USA INT CAN Transmit Receive
Channel number Frequency (MHz)
USA INT CAN Transmit Receive
Channel number Frequency (MHz)
USA INT CAN Transmit Receive
01
01 156.050 160.650
156.050 156.050
19A
20
19A 156.950 156.950
64A
64A 156.225 156.225
156.275 160.875
83A
83A 157.175 157.175
83b Rx only 161.775
84 157.225 161.825
157.225 157.225
20†
01A
03A
20
21
157.000 161.600
157.000 157.000
65
02
03
02 156.100 160.700
03 156.150 160.750
156.150 156.150
20A
65A 65A 65A 156.275 156.275
84
84A
85
84
85
86
87
88
21 157.050 161.650
21A 157.050 157.050
21b Rx only 161.650
157.100 161.700
66
156.325 160.925
156.325 156.325
66A†
21A
22A
66A 66A
67†
85 157.275 161.875
157.275 157.275
04
05
156.200 160.800
67
68
69
67 156.375 156.375
68 156.425 156.425
69 156.475 156.475
85A
86
04A 156.200 156.200
156.250 160.850
22
23
68
86 157.325 161.925
157.325 157.325
22A 157.100 157.100
23 157.150 161.750
157.150 157.150
69
86A
87
70‡ 70‡ 70‡
05A
06
05A 156.250 156.250
06 156.300 156.300
156.350 160.950
156.525 156.525
87 157.375 161.975
157.375 157.375
06
07
23A
24
71
72
71
72
73
74
77
78
71 156.575 156.575
72 156.625 156.625
73 156.675 156.675
74 156.725 156.725
87A
88
24
25
24 157.200 161.800
25 157.250 161.850
25b Rx only 161.850
26 157.300 161.900
27 157.350 161.950
28 157.400 162.000
28b Rx only 162.000
60 156.025 160.625
156.075 160.675
88 157.425 162.025
157.425 157.425
07A
08
07A 156.350 156.350
08 156.400 156.400
09 156.450 156.450
10 156.500 156.500
11 156.550 156.550
12 156.600 156.600
25
73
88A
08
09
10
11
12
13
14
74
77†
77†
09
26
27
28
26
27
28
156.875 156.875
156.925 161.525
Frequency (MHz)
WX channel
10
Transmit Receive
11
78A
79A
80A
81A
82A
78A 156.925 156.925
156.975 161.575
1
2
RX only
RX only
RX only
RX only
RX only
RX only
RX only
RX only
RX only
RX only
162.550
162.400
162.475
162.425
162.450
162.500
162.525
161.650
161.775
163.275
12
13†
79
80
81
82
83
13†
156.650 156.650
14 156.700 156.700
156.750 156.750
16 156.800 156.800
60
61
79A 156.975 156.975
157.025 161.625
3
14
4
15† 15† 15†
61A
61A 156.075 156.075
156.125 160.725
80A 157.025 157.025
157.075 161.675
5
16
17†
16
17
18
62
63
64
6
17†
156.850 156.850
156.900 161.500
62A 156.125 156.125
156.175 160.775
81A 157.075 157.075
157.125 161.725
7
8
18A
18A 156.900 156.900
156.950 161.550
63A
156.175 156.175
82A 157.125 157.125
83 157.175 161.775
9
19
64 156.225 160.825
10
† Low power only.
‡ Receive only.
NOTE:Simplex channels, 3, 21, 23, 61, 64, 81, 82 and 83 CANNOT
be lawfully used by the general public in U.S.A. waters.
41
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SPECIFICATIONS AND OPTIONS
12
■ Specifications
General
•Frequency coverage
Transmit
Receive
•Mode
Receiver
•Receive system
:
:
Double conversion
superheterodyne
156.025–157.425 MHz
156.050–163.275 MHz
•Sensitivity (12 dB SINAD) : Less than 0.25 µV (typical)
•Squelch sensitivity : Less than 0.3 µV
Intermodulation rejection ratio: More than 80 dB (typical)
•Spurious response
rejection ratio
: FM (16K0G3E)
DSC (16K0G2B)
: 25 kHz
•
•Channel spacing
: More than 80 dB (typical)
•Current drain (at 13.8 V) : TX high
Max. audio 1.2 A max.
•Power supply requirement: 13.8 V DC ±15%
6.0 A max.
•
Adjacent channel selectivity: More than 80 dB (typical)
•Audio output power
: More than 3.5 W at 10% distor-
•Frequency stability
: ±10 ppm
tion with a 4 Ω load
(–20°C to +60°C; –4°F to
+140°F)
•Dimensions
: 165(W)×110(H)×109.4(D) mm
(Projection not included) 61⁄2(W)×411⁄32(H)×45⁄16(D) in
•Weight
: 1130 g; 2 lb 8 oz
Transmitter
•Output power
: 25 W and 1 W
•Modulation system
: Variable reactance phase
modulation
•Max. frequency deviation : ±5.0 kHz
•Spurious emissions : –70 dB
All stated specifications are subject to change without
notice or obligation.
42
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SPECIFICATION AND OPTIONS
12
■ Options
•MB-75 FLUSH MOUNT
For mounting the transceiver to a panel.
•SP-5 EXTERNAL SPEAKER
A large, external speaker for superior audio output.
•SP-10 EXTERNAL SPEAKER
A compact, external speaker. Features easy installation.
•UT-98 VOICE SCRAMBLER UNIT (pgs. 10, 33)
•UT-112 VOICE SCRAMBLER UNIT
Ensures private communications. 128 or 32 codes are avail-
able. Not available in some countries.
•HM-127 REMOTE-CONTROL MICROPHONE (p. 44)
External microphone-type controller. Provides optional inter-
com operation. 6 m (20 feet) microphone cable and mount-
ing base included. Black and white colors are available.
•OPC-999 MICROPHONE EXTENSION CABLE
6 m (20 feet) microphone extension cable for optional
HM-127. Up to 2 OPC-999 can be connected. (18 m; 60 feet
maximum)
43
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OPTIONAL
HM-127 REMOTE-CONTROL MICROPHONE
13
w PTT SWITCH [PTT] (pgs. 8, 51)
■ Panel description
Push and hold to transmit; release to receive.
e CHANNEL UP/DOWN SWITCHES [Y]/[Z]
➥ Push either switch to change the operating channel, set
mode contents, etc. (pgs. 8, 51)
The optional HM-127 remotely controls the IC-M502 and pro-
vides an optional intercom function.
➥ While pushing [H/L], push [Y]/[Z] to adjust the bright-
ness of the LCD and switch backlight. (p. 52)
➥ Push either switch to adjust audio level or noise squelch
level after [VOL] or [SQL] is pushed, respectively. (pgs.
8, 51)
➥ In set mode, changes setting of the selected item. (pgs.
9, 55)
➥ Checks tag channels or changes scanning direction dur-
ing scan. (pgs. 8, 54)
!
o
q
w
i
u
y
t
e
r
r CHANNEL 16/CALL CHANNEL SWITCH [16•9]
➥ Selects channel 16 when pushed. (pgs. 6, 50)
➥ Selects call channel when pushed for 1 sec. (pgs. 6, 50)
•“CALL” appears when call channel is selected.
➥ Push for 3 sec. to enter call channel programming con-
dition when call channel is selected. (pgs. 9, 53)
➥ While pushing [H/L], enters memory name programming
condition. (pgs. 9, 56)
➥ Enters set mode when pushed while turning power ON.
(pgs. 30, 55)
t CHANNEL/DUALWATCH/TRI-WATCH SWITCH
[CH/WX•DW•U/I/C]
q POWER SWITCH [PWR] (pgs. 8, 51)
Push for 2 sec. to turn the HM-127 power ON or OFF
when the IC-M502 power is turned ON.
➥ Selects and toggles the regular channels and weather
channel when pushed momentarily. (pgs. 6, 7, 50)
44
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HM-127 REMOTE-CONTROL MICROPHONE
13
•[PWR], [PTT], [VOL], [SQL] and [H/L] still function when the
microphone key lock function is turned ON.
➥ While pushing [H/L], selects one of 3 regular channels
in sequence when pushed. (pgs. 6, 7, 50)
•International, U.S.A. and Canadian channels are available for
regular channels.
➥ Advance the cursor while in memory name program-
ming condition. (pgs. 9, 56)
➥ Starts dualwatch or tri-watch when pushed for 1 sec.
(pgs. 11, 54)
➥ Stops dualwatch or tri-watch when either is activated.
y ATTENUATOR/INTERCOM/SCRAMBLER SWITCH
[LO/DX•IC•SCR]
i VOLUME/DIMMER SWITCH [VOL•DIM]
➥ [Y]/[Z] adjusts the audio level after pushing [VOL].
➥ Push [VOL•DIM] for 1 sec. to adjust the brightness of
the LCD and switch backlight. (p. 52)
➥ Move the cursor backward while in memory name pro-
gramming condition. (pgs. 9, 56)
o TRANSMIT POWER SWITCH [H/L]
➥ Toggles high and low power when pushed. (pgs. 8, 51)
•Some channels are set to low power only.
➥ Toggles the attenuator function ON and OFF when
pushed momentarily. (pgs. 8, 51)
•“LOCAL” appears when the attenuator is in use.
➥ Activates the intercom function when pushed for 1 sec.
(pgs. 29, 56)
➥ Calls the IC-M502 when pushed and held while in inter-
com mode. (pgs. 29, 56)
➥ While pushing [H/L], activates an optional voice scram-
bler function. (pgs. 10, 53)
➥ While pushing this switch, other switches perform sec-
ondary functions.
➥ Toggles the all key lock function ON or OFF when
pushed while turning power ON. (p. 52)
•“ T ” flashes while the all key lock function is in use.
•Only [PWR] and [PTT] function when the all key lock function
is in use.
•The optional voice scrambler function cannot be used on
channel 16 and 70.
! SCAN SWITCH [SCN•TAG] (pgs. 13, 54)
➥ Starts and stops normal or priority scan when tag chan-
nels are programmed.
u SQUELCH/MONITOR/LOCK SWITCH [SQL•MONI•L]
➥ [Y]/[Z] sets the squelch threshold level after pushing
[SQL]. (p. 51)
➥ Push [SCN•TAG] for 1 sec. to set the displayed channel
as a tag (scanned) channel.
➥ Push [SQL•MONI] for 1 sec. to turn the monitor function
ON. (p. 52)
➥ While pushing [H/L], push for 3 sec. to clear all tag chan-
nels.
➥ While pushing [H/L], push [SQL•MONI•L] to toggle the
microphone key lock function ON or OFF. (p. 52)
•“ T ” appears while key lock function is in use.
45
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HM-127 REMOTE-CONTROL MICROPHONE
13
➥ In set mode, indicates the selected condition. (pgs. 30,
55)
■ Function display
r VOLUME INDICATOR (p. 51)
!
!
!!!
!
Appears while audio output level is adjusted.
t SQUELCH INDICATOR (p. 51)
TX BUSY TAG CALL LOW
WX ALT
CAN
USA
INT
L
Appears while noise squelch level is adjusted.
!
!
DUP DUAL
P SCAN TRI
q
w
y CHANNEL NAME INDICATOR
➥ Channel comment appears (and scrolls) if programmed.
(pgs. 9, 56)
!
o
e
r
t
VOL
SQL
SCRM
➥ In set mode, indicates or scrolls the selected set mode
item. (pgs. 30, 55)
LOCAL
i
u ATTENUATOR INDICATOR (pgs. 8, 51)
y
u
Appears when the RF attenuator is in use.
q CHANNEL GROUP INDICATOR (pgs. 6, 50)
i SCRAMBLER INDICATOR (pgs. 10, 53)
Indicates whether an International (INT), U.S.A. (USA) or
Canadian (CAN) channel is selected.
Appears when an optional voice scrambler is activated.
o SCAN INDICATOR (pgs. 13, 54)
➥ “SCAN” appears during normal scan.
➥ “P SCAN” appears during priority scan.
w KEY LOCK INDICATOR (p. 52)
➥ Appears while the key lock function is in use.
➥ Flashes while the all key lock function is in use.
! PRIORITY CHANNEL INDICATOR
e CHANNEL NUMBER READOUT
➥ Indicates the selected operating channel number. “A”
appears when a simplex channel is selected. (pgs. 6,
50)
➥ Indicates a priority channel during priority scan or
dual/tri-watch. (pgs. 12, 54)
➥ “IC” appears during intercom mode. (pgs. 29, 56)
46
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HM-127 REMOTE-CONTROL MICROPHONE
13
! DUAL/TRI WATCH INDICATOR (pgs. 11, 54)
■ HM-127 supplied accessories
“DUAL” appears during dualwatch;“TRI” during tri-watch.
Accessories included with the HM-127:
Qty.
! WEATHER CHANNEL INDICATOR (pgs. 7, 50)
➥ “WX” appears when a weather channel is selected.
➥ “ALT” appears when the weather alert function is in use;
flashes when an alert tone is received.
q Connection cable (OPC-1000: 6 m; 20 ft) ...................... 1
w Mounting base ................................................................ 1
e Microphone hanger ........................................................ 1
r Screws (M3 × 16; tapping) ............................................. 5
! LOW POWER INDICATOR (pgs. 8, 51)
Appears when low power is selected.
! CALL CHANNEL INDICATOR (pgs. 6, 50)
Appears when the call channel is selected.
! DUPLEX INDICATOR (pgs. 6, 50)
Appears when a duplex channel is selected.
! TAG CHANNEL INDICATOR (pgs. 13, 54)
w
e
Appears when a tag channel is selected.
! BUSY INDICATOR (pgs. 8, 51, 52)
Appears when receiving a signal or when the squelch
opens.
r
! TRANSMIT INDICATOR (pgs. 8, 51)
Appears while transmitting.
q
47
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HM-127 REMOTE-CONTROL MICROPHONE
13
w To use the supplied cable as a wall socket, follow the fol-
lowing steps.
■ Installation
e Using the mounting base, carefully mark off the 2 spots
where the cable and screws will be fastened.
r Drill holes at these marks.
The optional HM-127 can be connected to the transceiver di-
rectly, as well as via the supplied connection cable for longer
distance remote operation. The connector of the connection
cable can be installed into a cabinet, wall, etc., as a built-in
plug.
t Install the mounting base using screws as shown below.
Mounting base
Nut
For longer distance remote operation, the optional extension
cable, OPC-999 (6 m; 20 ft/Connecting between transceiver
and the connection cable.), is available, and up to 2 OPC-999
can be added.
q Insert the supplied cable into the external microphone jack
Gasket
and tighten the cable nut as shown below.
Screw holes
(approx. 2 (d) mm; 3⁄32″)
Cap
y The installation is finished
when it is completed.
48
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HM-127 REMOTE-CONTROL MICROPHONE
13
Mounting base
5 mm; 3⁄16˝
2 mm; 3⁄32˝
Nut
Cap
Gasket
49
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HM-127 REMOTE-CONTROL MICROPHONE
13
■ Channel selection
Channel 16
U.S.A., International and Canadian channels
q Push [CH/WX] to select regular channel.
•Push [CH/WX] again, if weather channel appears.
w Push [CH/WX•U/I/C], while pushing [H/L], to select chan-
nel group.
q Push [16] to select channel 16.
w Push [CH/WX] to return to the
condition before selecting chan-
nel 16, or push [Y] or [Z] to se-
lect operating channel.
•U.S.A., International and Canadian channels can be selected in
sequence.
Push
Call channel
q Push [16•9] for 1 sec. to select
call channel.
w Push [CH/WX] to return to the
condition before selecting call
channel, or push [Y] or [Z] to se-
lect operating channel.
Push
U.S.A. channels
+
while pushing
Push
for 1 sec.
Weather channels
q Push [CH/WX] once or twice to
select weather channel group.
w Push [Y] or [Z] to select weather
channel.
+
International channels
Canadian channels
e Push [CH/WX] to return to the
condition before selecting the
weather channel group.
Push
50
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HM-127 REMOTE-CONTROL MICROPHONE
13
■ Receiving and transmitting
q Push [PWR] to turn power ON.
w Push [VOL], then [Y]/[Z] to adjust audio output level.
•Push [SQL], then [Y]/[Z] to mute any audio nose, if necessary.
e Push [Y]/[Z] to select the desired channel.
t Push and hold [PTT] to transmit, then speak into the mi-
crophone.
•“ ” appears.
•Channel 70 cannot be used for transmission (for GMDSS use).
•When receiving a signal, “
” appears and audio is emitted
Simplex channels, 3, 21, 23, 61, 64, 81, 82 and 83 CAN-
NOT be lawfully used by the general public in U.S.A. wa-
ters.
from the speaker.
•Further adjustment of audio level may be necessary at this point.
•Use the optional voice scrambler function for privacy. (pgs. 10,
53)
y Release [PTT] to receive.
r Push [H/L] to select the output power, if necessary.
•“LOW” appears when low power is selected.
•Choose low power for shorter, high power for longer distance
communications.
IMPORTANT: To maximize the readability of your trans-
mitted signal (voice), pause a few sec. after pushing [PTT],
hold the microphone 10 to 15 cm (4 to 6 inches) from your
mouth and speak at a normal voice level.
•Some channels are low power only.
r Set output power
q Turn power ON
■ RF attenuator function
t Push to
transmit
y Release
➥ Push [LO/DX] to turn the RF
attenuator function ON and
OFF.
w Set volume
to receive
w Set squelch,
if required
e Set channel
t Speak into
microphone
Appears when the RF
attenuator function is in use
51
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HM-127 REMOTE-CONTROL MICROPHONE
13
■ Lock functions
■ Display backlighting
The lock function electronically locks keys and switches to
prevent accidental changes and function access from the mi-
crophone.
The function display and switches can be backlit for better
visibility under low light conditions. And the backlighting con-
dition can be adjusted independently from the transceiver.
•All keys, switches and controllers on the transceiver are functional.
q Push [VOL•DIM] for 1 sec. to enter backlight adjusting
mode.
Activating the lock
function
➥ Push [SQL] while pushing
[H/L] to turn the lock function
ON and OFF.
•“
” with number of backlight level appears in the channel name
indicator.
w Push [Y]/[Z] to adjust the backlight level.
•The backlight level is adjustable between 0 (lights OFF) and 7
(brightest).
•“ ” appears.
•Only [PWR], [PTT], [H/L],
For your reference:
Appears when the lock
[SQL•MONI], [VOL]+[Y]/[Z] and
[SQL]+[Y]/[Z] are functional.
function is in use.
Pushing [Y]/[Z], while [H/L] is pushed, also adjusts backlight
level.
•No backlight level indication is available.
Activating the all key
lock function
➥ Turn the power ON by pushing
[PWR] while pushing [H/L] to
turn the all key lock function
ON and OFF.
■ Monitor function
The monitor function releases the noise squelch mute of the
microphone only. (An independent noise squelch system is
employed.)
➥ Push [SQL•MONI] for 1 sec. to activate the monitor func-
tion.
Flashes when the all lock
function is in use.
•“ ” flashes.
•Only [PWR] and [PTT] are func-
tional.
•“
” flashes and audio is emitted.
•Any key, except [Y]/[Z], cancels the monitor function.
52
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HM-127 REMOTE-CONTROL MICROPHONE
13
■ Call channel programming
■ Optional voice scrambler
operation
q Push [CH/WX•U/I/C] several times
while pushing [H/L] to select the
desired channel group (USA, INT,
CAN) to be programmed.
Activating the scrambler
q Select an operating channel, except channel 16 or weather
channels.
w Push [LO/DX•IC•SCR] while
pushing [H/L] to turn the
voice scrambler function ON.
•“SCRM” appears.
w Push [16•9] for 1 sec. to select the
call channel of the selected chan-
nel group.
•“CALL” and call channel number ap-
e To turn the scrambler func-
pear.
tion OFF, repeat step w.
Appears when the voice
scrambler function is in use.
•“SCRM” disappears.
e Push [16•9] again for 3 sec. (until
long beep changes to 2 short
beeps) to enter call channel pro-
gramming condition.
•Call channel number and channel
group to be programmed flashes.
r Push [Y]/[Z] to select the desired
channel.
Programming scramble codes
There are 128 codes (00 to 127) available with UT-98 or 32
codes (01 to 32) available with the UT-112 for programming.
In order to understand one another, all transceivers in your
group must have the same scrambler code, as well as the
same scrambler unit. The scrambler code is programmed in
set mode. See pgs. 10, 33, 55 for details.
t Push [16•9] to program the dis-
played channel as the call channel.
•The call channel number and channel
group stop flashing.
53
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HM-127 REMOTE-CONTROL MICROPHONE
13
■ Starting a scan
■ Setting tag
■ Dualwatch/Tri-
channels
watch operation
q Push [Y]/[Z] to select the desired
channel.
•Push [CH/WX•U/I/C] several times while
pushing [H/L] to select the channel
group (USA, INT, CAN), if desired.
w Push [CH/WX•DW] for 1 sec. to start
dualwatch or tri-watch.
q Push [CH/WX•U/I/C] several times
while pushing [H/L] to select the
channel group (USA, INT, CAN), if
desired.
q Push [CH/WX•U/I/C] several times
while pushing [H/L] to select the
channel group (USA, INT, CAN), if
desired.
w Push [Y]/[Z] to select the desired
channel to set as a tag channel.
e Push [SCN•TAG] for 1 sec. to set the
displayed channel as a tag channel.
•When the weather alert function is in
use, select the desired weather channel
with [CH/WX] and [Y]/[Z].
w Push [SCN] to start priority or normal
scan.
•“DUAL” appears during dualwatch; “TRI”
•“SCAN” appears during normal scan.
•The priority channel readout indicates
“16”, and “P” and “SCAN” indicators ap-
pear during priority scan.
appears during tri-watch.
•“
” appears.
•Beep tone sounds when a signal is re-
ceived on channel 16.
r To cancel the tag channel setting,
push [SCN•TAG] for 1 sec.
•Tri-watch becomes dualwatch when re-
ceiving a signal on the call channel.
e To cancel dualwatch/tri-watch, push
[CH/WX•DW] again.
•When a signal is received, scan pauses
until the signal disappears or resumes
after pausing 5 sec. according to set
mode setting (Channel 16 is still moni-
tored during priority scan).
•“
” disappears.
•Clearing all tag channels in the
selected channel group
•Push [Y]/[Z] to check the scanning tag
channels, to change the scanning direc-
tion or resume the scan manually.
e To stop the scan, push [SCN].
•“SCAN” disappears.
➥ Push [SCN•TAG] while pushing [H/L]
for 3 sec. (until long beep changes to
2 short beeps).
•Pushing [PTT], [16•9] or [CH/WX] also
stops the scan.
54
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HM-127 REMOTE-CONTROL MICROPHONE
13
■ Set mode programming
Set mode is used to change the condition of the transceiver’s
functions and the microphone’s own functions:
•Beep tone “BEEP”
➥ Push [Y] to turn ON, [Z] to turn OFF the beep output.
Transceiver’s functions—
scan mode (normal or priority), scan resume timer, weather
alert, dualwatch/tri-watch selection, DSC watch, transceiver’s
beep tone, internal speaker (transceiver), LCD contrast
(transceiver), RF attenuation level, scrambler code and
scrambler type.
Push
Microphone’s own functions—
beep tone function (microphone) and LCD contrast (micro-
phone).
•LCD contrast “LCD CONTRAST”
➥ Push [Y]/[Z] to adjust to a suitable LCD contrast.
In this section, instructions are for the microphone’s own func-
tions only. Refer pgs. 30–33 for the setting of the other func-
tions. (Some functions may not be selected from the micro-
phone.)
• •
Push
• •
Entering set mode
q Turn power OFF.
w While pushing [16•9], turn power ON.
•After beep emission, a set mode item (in the channel name indi-
cator and condition in the channel number readout) is displayed.
e Push [16•9] to select the desired item, if necessary.
r Push [Y]/[Z] to select the desired condition of the item.
t Turn power OFF, then ON to exit set mode.
55
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HM-127 REMOTE-CONTROL MICROPHONE
13
■ Intercom operation
■ Channel names
q Push [LO/DX•IC] for 1 sec. to ac-
tivate the intercom function.
•“IC” appears in the priority channel
readout.
q Push [Y]/[Z] to select a channel to program.
•Push [CH/WX•U/I/C] several times while pushing [H/L] to select
the channel group (USA, INT, CAN), if desired.
w While pushing [H/L], push [16•9].
•The channel name disappears.
•The 1st character of the currently programmed comment flashes.
w Push [PTT] to talk.
e Push [Y]/[Z] to select a character.
Appears when the inter-
com function is in use.
•“
” appears in the channel
r Push [SQL] to move to right; then push [Y]/[Z] to select a
character.
name indicator.
e Release [PTT] to listen.
•Push [VOL] to move to the left.
•“
” appears in the channel name indicator when the trans-
t Continue until the desired characters have been selected,
the push [16•9] to return to normal operation.
ceiver is in talking.
r Push [LO/DX•IC] to cancel the intercom function.
•Pushing [16], [SCN•TAG] or [CH/WX] is also cancels the inter-
com function.
•Available characters
(space)
(✱)
(4)
(!)
(+)
(5)
(F)
(P)
(Z)
(j)
(")
(#)
(–)
(7)
(H)
(R)
(b)
(l)
($)
(.)
(
%
)
(&)
(0)
(A)
(K)
(U)
(e)
(o)
(y)
(’)
(1)
(B)
(L)
(V)
(f)
(()
(2)
(C)
(M)
())
(3)
(D)
(N)
(X)
(h)
(r)
For your reference:
(,)
(/)
In case the intercom mode is selected with the transceiver
during microphone power OFF, the microphone power is au-
tomatically turned ON and the intercom mode is selected.
(6)
(G)
(Q)
(a)
(k)
(u)
(8)
(I)
(9)
(J)
(T)
(d)
(n)
(x)
(E)
(O)
(Y)
(i)
(S)
(c)
(m)
(w)
(W)
(g)
(q)
Intercom beep function
➥ Push [LO/DX•IC] for more than 1 sec.
•Emits intercom beep while holding.
(p)
(z)
(s)
(t)
(v)
56
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TEMPLATE
149 (57⁄8˝)
MB-75
4–R11
2 mm; 3⁄32˝
HM-127
24 to 27 (d) mm
(15⁄16 to 11⁄16˝)
Unit: mm (inch)
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Count on us!
A-5663H-1EX-w
Printed in Japan
© 2000 Icom Inc.
1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003 Japan
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