Ericsson Two Way Radio MTL SX User Manual

LBI-38433A  
Mobile Communications  
MTL-SX  
440 - 470 MHz  
PORTABLE TWO-WAY FM RADIO  
TABLE OF CONTENTS  
REAR COVER ASSEMBLY . . . . . . . . . . . . . . . . . LBI-38383  
FRONT COVER ASSEMBLY (EARLIER) AND  
CONTROL BOARD . . . . . . . . . . . . . . . . . . . . . . LBI-38514  
FRONT COVER ASSEMBLY (LATER) LESS  
CONTROL BOARD . . . . . . . . . . . . . . . . . . . . . . LBI-38834  
SERVICE SECTION . . . . . . . . . . . . . . . . . . . . . . LBI-38516  
Maintenance Manual  
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LBI-38433  
SPECIFICATIONS*  
GENERAL  
Frequency Range  
440 - 470 MHz  
450 - 470 MHz  
AXATR-185-B2  
TR-185-D2  
16  
Factory Tuned Frequency Range  
FCC Type Acceptance Number  
DOC Number  
Channel Capacity  
Frequency Stability  
2.5 ppm  
Channel Spacing  
25 kHz  
Operating Temperature Range  
Maximum Relative Humidity  
Battery Voltage  
-30°C to +60°C  
90% at 55°C  
7.5 Vdc (nominal)  
Dimensions (H x W x D)  
less battery, knobs and antenna  
with Extra High Cap. Battery  
140 x 69 x 38 mm (5.52 x 2.72 x 1.50 ")  
232 x 69 x 40 mm (9.15 x 2.72 x 1.58 ")  
Weight  
less battery and antenna  
with Extra High Cap. Battery  
540 grams (19 ounces)  
907 grams (32 ounces)  
TRANSMITTER  
Rated RF Power Output  
High / Low RF Power Output  
5.0 Watts  
5.0 Watts / 1 Watt (programmable on a per channel  
basis)  
Maximum FM Deviation  
FM Hum and Noise  
±5 kHz  
-45 dB (companion receiver)  
Spurious and Harmonic Emissions  
Audio Response  
-74 dBc  
+1 to -3 dB (6 dB/octave pre-emphasis from  
300 Hz to 3 kHz)  
Audio Distortion  
less than 3% (at 1000 Hz tone, ±3 kHz deviation)  
RECEIVER  
Sensitivity (12 dB SINAD)  
Adjacent Channel Selectivity  
Critical Squelch  
-116 dBm (0.35 µV)  
-75 dB  
10 dB SINAD  
Modulation Acceptance  
Intermodulation  
±7 kHz  
-75 dB  
Spurious and Image Rejection  
Audio Output  
-75 dB  
500 mW (24-ohm load impedance)  
Audio Response  
+2 to -8 dB (6 dB/octave de-emphasis from  
300 Hz to 3 kHz)  
Audio Distortion  
less than 5% (at 500 mW)  
*
These specifications are intended primarily for the use of the serviceman. See the appropriate Specifications Sheet  
for the complete specifications.  
3
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LBI-38433  
OPTIONS AND ACCESSORIES  
Radios, Antennas, Batteries  
Carrying Accessories  
146-162 MHz HELICAL ANTENNA PANC1C  
157-174 MHz HELICAL ANTENNA PANC1D  
440-470 MHz HELICAL ANTENNA PANC1F  
BELT CLIP  
PAHC1C  
CARRYING CASE  
WITH BELT LOOP  
PAHC1E  
PAHC1F  
WITH SWIVEL MT  
SHOULDER  
STRAP  
PAHC1K  
Swivel Mount Plate  
5203  
PAHC1G  
PAHC1H  
Audio Accessories  
HEADSET/MIC  
PAAB1A  
SPKR/MIC  
PAAE1A  
GE-STAR LANYARD  
INTERFACE CONNECTOR  
PAAC1B  
(Provided with PAAB1A)  
HIGH CAPACITY BATTERY  
PAPA1G (INTRINSICALLY SAFE)  
HIGH CAPACITY BATTERY  
PAPA1H  
EXTRA HIGH CAP. BATTERY  
PAPA1F (INTRINSICALLY SAFE)  
EXTRA HIGH CAP. BATTERY  
PAPA1E  
Chargers  
MULTI-CHARGER  
H2A2L2A 120 VAC 14 HR  
H2A2J1A 120 VAC 1 HR  
H2A2M2A 240 VAC 14 HR  
H2A2N1A 240 VAC 1 HR  
UNIVERSAL MULTI-CHARGER  
CH6RA1 120 VAC 1HR  
CH6SA1 120 VAC 14HR  
CH6RA2 230 VAC 1HR  
CH6SA2 230 VAC 14HR  
COMPACT CHARGER  
H2A5C2A - Vehicular Charger  
H2A6L2A - Desk Charger  
UNIVERSAL DESK CHARGER  
CH1RA1 120 VAC 1 HR  
CH1SA1 120 VAC 14 HR  
CH1RA2 230 VAC 1 HR  
CH1SA2 230 VAC 14 HR  
VEHICULAR CHARGER  
H2V01 - Vehicular Charger  
H2V02 - Vehicular Chgr/Rptr Control  
4
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LBI-38433  
standard EIA frequencies, can be programmed for  
encoded/decoded operation.  
INTRODUCTION  
Programmable Multi-Code Digital Channel  
Guard - Similar capability as with tone Channel  
Guard is provided.  
The Ericsson GE MTL-SX radio is a high-quality mi-  
croprocessor-controlled synthesized portable FM radio. All  
transmitter and receiver functions are controlled by the mi-  
croprocessor-based circuitry.  
Two-Tone Sequential (T99) Decode - Selective  
calling decode is enabled or disabled on each indi-  
vidual channel.  
The MTL-SX radio’s sturdy die-cast aluminum case has  
rotary volume and channel controls on its top panel and three  
(3) recessed push-buttons which provide scan control on its  
front panel. A indicator light on the front panel lights when  
the radio is transmitting and flashes when and the radio is  
scanning. A recessed emergency button is located on the top  
of the radio. All personality features are programmable with  
the PC programming software.  
Channel Busy Lockout - Personality information  
includes transmit disable capability on a channel  
where carrier activity is present. This feature is  
selectable on a per channel basis.  
Programmable Carrier Control Timer - A pro-  
grammable transmit timer will automatically dis-  
able the transmitter and provide an alerting tone  
after time-out. This feature prevents radio damage  
and unnecessary channel traffic in the event of a  
"stuck" mic. The CCT is reset on every PTT.  
FEATURES  
16-Channel Capability - The preprogrammed  
channels are selected with the top mounted rotary  
Control Knob.  
Programmable TransmitPower Level -Transmit-  
ter power level is PC programmable into the radio  
(high or low) on a per channel basis.  
Scan Capability With User Selectable Scan List  
- Using two (2) of the buttons on the front panel, the  
operator can add and delete any the programmed  
channels to the scan list. Priority-one and priority-  
two scan channels can also be selected. A thrid  
button on this panel is used to toggle scan operation  
on and off.  
Squelch Tail Elimination - Squelch and audio cir-  
cuits are designed so that annoying squelch pops  
which may occur at the end of received messages  
are minimized. This feature is compatible with ex-  
isting STE systems.  
Alert Tones - Alert tones prompt the operator of  
various radio conditions such as channel access,  
CCT time-out or a low battery.  
Volume Control Knob - This rotatable control  
provides quick and easy adjustments to the volume  
level. Minimum volume levels can be programmed  
into the unit to prevent missed calls due to a low  
volume setting.  
Programmable Through The Universal Device  
Connector (UDC) - The entire operation of the  
radio can be field customized by programming the  
unit using an IBM PC or compatible computer. The  
programmed personality is stored in non-volatile  
memory within the radio.  
Monitor Button - This side-mounted button is used  
to disabled squelch and if programmed for the se-  
lected channel, it is used to toggle CG and/or T99  
operation on and off.  
Simple Remote Control Capability - External ac-  
cessories can be connected to the UDC such as a  
headset, a speaker-mic or a lanyard. Connection of  
the speaker-mic allows the operator to remotely  
control PTT operation and audio level of the exter-  
nal speaker. An antenna jack is located on the UDC  
for the connection of a remote mounted antenna  
such as when the radio is used in a vehicular charger  
or repeater.  
Emergency Channel Feature - An emergency  
channel can be programmed into the radio for GE-  
STAR emergency signalling. GE-STAR emergency  
signalling is activated by the recessed Emegency  
Button on the top panel of the radio. GE-STAR can  
also be activated by a lanyard connected to the UDC  
(Universal Device Connector).  
GE-STAR Compatibility - The radio can be pro-  
grammed to transmit GE-STAR ID at PTT key, at  
PTT unkey, or both. 16,384 individual ID codes are  
available.  
Meets MIL-810C and D Specifications - The  
sturdy die-cast aluminum case is designed to seal  
out moisture, blowing rain and other harsh envi-  
romental factors.  
Programmable Multi-Tone Channel Guard  
(CTCSS) - Channel Guard tone frequencies within  
the range of 67 Hz to 210.7 Hz, including all of the  
Battery Packs - Several different battery pack sizes  
and capacities are available. Intrinsically safe bat-  
tery packs are available for use in hazardous envi-  
ronments.  
5
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LBI-38433  
flex circuits include the Keypad, UDC and Speaker Flex  
circuits. The speaker, microphone and Battery Plate are also  
a part of this assembly. The complete assembly is housed in  
the die-cast aluminum front cover.  
Available Options - These options include the an-  
tennas, audio accessories, batteries, carrying acces-  
sories, chargers, lanyards, and the vehicular  
charger/repeaters.  
The Control Board located in the Front Cover Assembly  
is the largest and most complex board in the Front Cover  
Assembly. It contains all microcomputer and audio circuitry  
which controls the radio. See the maintenance manuals spe-  
cific to the Control Board or the Front Cover Assembly for  
service information on the related assembly.  
DESCRIPTION  
The MTL-SX portable radio is consists of a two primary  
assemblies. The Front Cover Assembly contains all of the  
microprocessor circuitry, audio circuitry and the operating  
controls. The Rear Cover Assembly houses the RF circuitry  
which includes the transmitter, receiver and the frequency  
synthesizer. The assemblies are electrically interconnected  
by two single-in-line type connectors. When mated together,  
the assemblies form a weather resistant die-cast aluminum  
case that protects the radio’s circuitry from harsh outside  
environments.  
ANTENNA  
Antenna PANC1F (part number 19B234804P12) is a  
helically-designed 440 - 470 MHz antenna that mounts in the  
antenna jack on the top of the radio. An external antenna can  
be mounted to the unit via the UDC. When an antenna is  
connected to the UDC, the antenna on the top of the radio is  
disabled.  
Power is provided by a battery pack that slides and locks  
on to the bottom of the radio. The radio’s on/off switch is  
located on the battery pack.  
BATTERY PACKS  
The antenna screws on to the top of the unit. A side  
antenna connection is also provided at the UDC for an  
external antenna or for test purposes. This UDC antenna  
connection is also utilized for external antenna operation  
when the radio is locked in the vehicular charger or repeater.  
The battery pack connects to the bottom of the unit and  
delivers a nominal 7.5 Volts dc to the radio. Arecessed on/off  
switch for the radio is located on the battery pack. An internal  
fuse located in the radio’s Battery Plate protects the radio and  
battery from excessive current draw. The battery packs are  
available in several different capacities and sizes.  
REAR COVER ASSEMBLY  
Radio contacts located on the top of the pack include  
switched power, ground, the speaker enabling contacts and  
a continuous power contact. In addition, four contacts are  
located on the rear of the battery pack. These four contacts  
provide connections to the slip-in type chargers or vehicular  
chargers/repeaters while the battery pack is still connected  
to the unit. The battery charging contacts are diode protected  
from external shorts.  
The Rear Cover Assembly houses the RF Board in the  
die-cast aluminum case. The complete assembly consists of  
the UHF RF Board, aluminum case, top antenna jack, side  
(UDC) antenna jack and various hardware.  
The RF Board’s circuitry includes the transmitter, re-  
ceiver and the frequency synthesizer. This FM circuitry is  
under complete control of the microprocessor circuits. Con-  
trolling data sent to this assembly from the Control Board  
includes serial synthesizer data loading, transmitter/receiver  
enabling and a transmitter power level signal. The RF Board  
outputs the demodulated audio and a synthesizer lock status  
line to the Control Board. During transmitter operation, the  
RF power appears at the top antenna jack (or the UDC jack  
if the appropriate adapter plug is inserted). The Rear Cover  
Assembly maintenance manual contains a detailed circuit  
analysis, mechanical, outline and schematic diagrams for  
this assembly.  
The chargers utilize an internal thermistor in the battery  
pack to sense temperature and automatically control charge  
rate of the battery. This allows for a maximum charge rate  
without overheating the battery pack. All battery packs can  
be charged in less than 1 1/2 hours with the rapid type  
chargers. Nominal full charge time in a standard charger is  
14 hours. The Service Section contains a detailed outline and  
schematic diagram of a typical battery pack. Further service  
information for the battery packs is also presented in the  
Service Section.  
Chargers are available with nominal charge times of one  
hour (rapid) and fourteen hours (standard). Combinations  
include single (1) and multi (5 or 6) position standard and  
rapid charge units. In addition, the vehicular chargers/repeat-  
ers simultaneously charge the battery while the radio is  
operating.  
FRONT COVER ASSEMBLY  
The Front Cover Assembly houses all of the operating  
controls and the digital control circuitry for the radio. The  
Control Board is installed in the Front Cover Assembly and  
6
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LBI-38433  
SIDE VIEW  
FRONT VIEW  
Figure 1 - MTL-SX Portable Radio  
The battery packs should be fully charged in an appro-  
priate charger before they are placed into service. This ap-  
plies to new battery packs received from the factory and to  
battery packs that have been stored for long periods of time.  
A fully charged battery pack should have an open-terminal  
voltage greater than 7.5 Volts (typically 9.0 Vdc). The low  
battery alert tone will sound when the battery pack needs  
charging.  
UNIVERSAL DEVICE CONNECTOR  
The UDC is located on the side of radio just above the  
PTT and Monitor Buttons. Various equipment such as the  
audio accessories can be connected to the radio via the UDC.  
The programming equipment is also connected to it when the  
personality is programmed into the radio. The UDC fur-  
nishes an excellent first-check-point for initial bench checks  
without the need to disassemble the radio. Table 2 lists all  
pins and their appropriate function. When the radio is turned  
on it senses the resistance value between UDC pins 9 and 1  
and switches the appropriate circuits to provide proper radio-  
to-accessory operation.  
7
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LBI-38433  
PROGRAMMING  
The radio’s personality is programmed using an IBM PC  
or compatible computer. A full-screen portable PC can be  
used for field programming. The Programming Manual and  
Software is TQ-3339 and TQ-4339. TQ-3339 is supplied  
with 5-1/4 inch floppy disks and TQ-4339 is supplied with  
3-1/2 inch disks. This software uses a series of screens and  
windows to guide you through a programming session. See  
TQ-3339 or TQ-4339 for further programming details. PC  
Programming Adapter TQ-3310 and Programming Cable  
TQ-3311 will also be required. These items provide interface  
and connection between the PC and the radio when the  
personality is transferred from the PC into the radio.  
NOTE  
After programming or reprogramming the radio,  
disconnect the programming cable an turn the radio  
off and then back on. This action will take the radio  
out of programming mode and restore normal op-  
eration.  
Figure 2 - UDC Pin-Out  
Table 1 - UDC Pin Functions  
INPUT OR  
OUTPUT  
PIN  
1
NAME  
USE  
GROUND  
UDC RX AUDIO  
SW BATT  
EXT PTT  
------  
Output  
Output  
Input  
Case Ground  
3
Test Point For Speaker Audio  
Switched Accessory Power  
External Microphone PTT Input  
For Programming  
4
5
6
TX DATA  
RX DATA  
SPARE  
Input  
7
Output  
For Programming  
8
9
UDC VOLT  
T/R  
------  
Output  
Output  
Input  
Option/Accessory Sense Pin  
Low = Transmit, High = Receive  
Low = Audio Muted  
10  
11  
12  
13  
34  
UDC MUTE  
EXT MIC HI  
EXT EMER  
UDC DISCR  
External Microphone Audio Input  
Lanyard Connection  
Input  
Output  
Test Point For RX Audio  
8
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LBI-38433  
In areas where transmission or reception is poor, some  
improvement may be obtained by insuring that the antenna  
is vertical. Moving a few yards in another direction or  
moving to a higher elevation may also improve communica-  
tion. Vehicular operation can be aided with the use of an  
externally mounted antenna.  
FEATURES PROGRAMMABLE ON A PER  
CHANNEL BASIS  
Transmit and Receive Frequencies  
Tone or Digital Channel Guard Encode/Decode  
Type 99 Tone Decode Enabled or Disabled  
Transmit Power Level High or Low  
Transmit STE On or Off  
Battery condition is another critical factor in the trouble  
free operation of a portable radio. Observe the procedures  
listed in the Service Section to insure the battery packs do  
not develop the "Memory Effect".  
Always observe all of the Federal Communication Com-  
mission’s rules and regulations during any service or oper-  
ating procedure.  
Channel Busy Lockout Enabled or Disabled  
Carrier Control Timer  
Alert Tones On or Off  
INTRINSICALLY SAFE USAGE  
Switch Crystal Frequency Enabled or Disabled  
GE-STAR Enabled or Disabled  
Selected portable radios with appropriate factory in-  
stalled F4 Options are certified as Intrinsically Safe by the  
Factory Mutual Research Corporation. Intrinsically Safe ap-  
proval includes Class I, II, III, Division 1 hazardous loca-  
tions in the presence of Groups C, D, E, F and G  
atmospheres. Non-Incendive approval includes Class I, Di-  
vision 2 hazardous locations in the presence of Groups A, B,  
C and D atmospheres.  
GE-STAR sent with Channel Guard  
FEATURES PROGRAMMABLE ON AN  
OVERALL RADIO BASIS  
Minimum Volume Level  
Hazardous locations are defined in the National Electri-  
cal Code. Useful standards NFPA 437A and NFPA 437M for  
the classifications of hazardous areas can be ordered from  
the National FireProtection Association, Batterymarch Park,  
Quincy, MA 02269.  
Power-Up Beep On or Off  
GE-STAR And GE-STAR Emergency Options  
Type 99 Tone Group Set  
Scan with Channel Guard Enabled or Disabled  
BATTERY PACKS  
Priority-One Scan Channel is the Selected Channel,  
Fixed Channel or Keypad Entered Channel  
Only battery packs identified with a green latch shall be  
used with a portable radio that is rated and labeled as Factory  
Mutual Intrinsically Safe. Use of non-specified battery packs  
voids Factory Mutual approval. The following battery pack  
options are approved for use in intrinsically safe radios:  
OPERATOR MANUAL  
Complete operating details for the MTL-SX radio are  
included in operator manual LBI-38431.  
PAPA1F  
(19A704860P6)  
Rechargeable Battery Pack,  
Extra High Capacity (Tall Case)  
PAPA1G  
(19A704850P6)  
Rechargeable Battery Pack,  
High Capacity (Short Case)  
OPERATING TIPS  
Antenna location and condition is important when using  
a UHF radio. Operating the radio in low areas of terrain,  
under power lines or bridges, inside of a vehicle or in a metal  
or steel framed building can severely reduce the range of the  
unit. Mountains and buildings can also reduce the range of  
the unit.  
9
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LBI-38433  
recommended Preventive Maintenance procedures that fol-  
low should be preformed when a technician comes in contact  
with a unit. Component level troubleshooting information is  
contained in the Service Section.  
ACCESSORIES  
The accessories that follow are approved for use with  
intrinsically safe radios. Use of accessories other than those  
listed voids Factory Mutual approval.  
PREVENTIVE MAINTENANCE  
Antenna  
PAAB1A  
(19B801508P3)  
Headset/Microphone  
PAAC1A  
Earpiece Kit  
(19B801508P2)  
The antenna and antenna contact should be kept clean  
and free from dirt or corrosion. If the antenna contact should  
become dirty or corroded, communication range could be  
reduced.  
PAAC1B  
(19B801508P8)  
GE-STAR Lanyard  
Speaker/Microphone  
PAAE1A  
(19B801508P1)  
Battery Packs  
PAAE1B  
(19B801508P4)  
Speaker/Microphone with  
GE-STAR Lanyard  
Insure the battery packs are properly maintained. Do not  
over or under charge them on a regular basis. Verify the  
contacts are clean and free of corrosion.  
PAAE1C  
Speaker/Microphone/Antenna  
(19B801508P6)  
Mechanical  
PANC1F  
Antenna, 440 - 470 MHz, Helical  
(19B234804P12)  
Since portable radio units are subject to shock and  
vibration, check for loose plugs, knobs, screws, etc.  
PAHC1C  
PAHC1D  
PAHC1E  
Belt Clip  
Swivel Mount with Belt Loop  
Transmitter Check  
Case, Leather, with Belt Loop  
(Short Case)  
Check transmit frequency and deviation. Normally  
these checks are made when the unit is first put into opera-  
tion. They should be repeated after the first month of opera-  
tion, then annually.  
PAHC1F  
PAHC1G  
PAHC1H  
PAHC1K  
PAHC1N  
Case, Leather, with Belt Loop  
(Tall Case)  
Case, Leather, with Swivel Mount  
and Belt Loop (Short Case)  
Receiver Check  
Case, Leather, with Swivel Mount  
and Belt Loop (Tall Case)  
Receiver sensitivity should be checked periodically as  
an indication of overall receiver operation.  
Shoulder Strap, Leather, with  
Mounting Plate  
Cleaning  
Holster, Plastic.  
If the unit requires an external cleaning use mild soap  
and a damp cloth. Avoid abrasive cleaners or chemicals  
which may damage the plastic or rubber surfaces on the unit.  
MAINTENANCE  
The MTL-SX radio is a very reliable unit and will  
normally provide many years of trouble-free service. The  
10  
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LBI-38433  
(19D438678, Sh. 3, Rev. 8)  
Figure 3 - Front Panel Parts  
Printed in U.S.A.  
11  
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LBI-38433  
BLOCK DIAGRAM  
Figure 4 - Rear Cover Assembly Block Diagram  
12  
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BLOCK DIAGRAM  
LBI-38433  
Figure 5 - Front Cover Assembly Block Diagram  
13  
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