Ericsson LBI-39014B Maintenance Manual
TABLE OF CONTENTS
RF BOARD . . . . . . . . . . . . . . . . . . . . . . . LBI-39017
SYSTEM BOARD . . . . . . . . . . . . . . . . . . . LBI-38842
AUDIO/LOGIC BOARD . . . . . . . . . . . . . . . . LBI-39016
AUDIO AMPLIFIER BOARD . . . . . . . . . . . . . LBI-38844
FRONT CAP ASSEMBLY . . . . . . . . . . . . . . . LBI-38850
LBI-38974
PA BOARD . . . . . . . . . . . . . . . . . . . . . . . LBI-39051
SERVICE SECTION . . . . . . . . . . . . . . . . . . LBI-39018
LBI-39014B
Maintenance Manual
MDX
UHF MOBILE RADIO
ERICSSONZ
Ericsson Inc.
Private Radio Systems
Mountain View Road
Lynchbur g, Virginia 24 502
1-800-528-7711 (Outside USA, 804-528-7711) Printed in U.S.A.
Copyright © March 1994, Ericsson GE Mobile Communications Inc.
TABLE OF CONTENTS
Page
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
RF BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
POWER AMPLIFIER BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
AUDIO/LOGIC BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
FRONT CAP ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SYSTEM BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
ACCESSORIES AND OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
PC PROGRAMMER OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
PC PROGRAMMED OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Carrier Control Timer (CCT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Channel Guard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Squelch Tail Elimination (STE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SPECIFICATIONS*
GENERAL
Regulatory Approval
FCC DOC
403 to 440 MHz AXATR-327-A2 TR-327
440 to 470 MHz AXATR-327-B2 TR-327
470 to 512 MHz AXATR-3 27 -C 2 -------
Operating Voltage
13.8 V olts ±20%
Battery Drain
Receiver (13.8 Vdc)
Off 0.01 Amperes (Maximum)
Squelched 0.75 Amperes (Maximum)
Unsquelched 3.5 Amperes (Maximum at 10 Wa tts audio, External Speaker)
Transmitter (13.8 Vdc) 13.0 Amperes (Maximum at 40 Watts RF)
Channel Spacing 25/30 kHz (12.5 or 10 kHz resolution)
Frequency Stability
±
2.5 PPM (± 0.00025%)
Temperature Range -30°C to 60°C (-22°F to +140°F)
Dimensions (H X W X D)
(Less Accessories)
Height 5.3 cm (2.1 inches)
Width 18.2 cm (7.2 inches)
Depth 24.0 cm (9.5 inches)
Weight 3.0 kg (6.6 pounds)
Antenna Impedance 50 Ohms
Continued
NOTICE!
This manual covers Ericsson and General Electric products manufactured and sold by Ericsson Inc.
NOTICE!
Repairs to this equipment should be made only by an authorized service technician or facility designated by the supplier. Any repairs, alterations or substitution of recommended parts made by the user to this equipment not approved by the manufacturer could
void the user’s authority to operate the equipment in addition to the manufacturer’s warranty.
This manual is published by Ericsson Inc., without any warranty. Improvements and changes to this manual necessitated by typographical errors, inaccuracies of current information, or improvements to programs and/or equipment, may be made by Ericsson Inc., at any time and without notice. Such changes will be incorporated into new editions of this manual. No part of this manual may be reproduced or transmitted in any
form or by any means, electronic or mechanical, including photocopying and recording, for any purpose, without the expres s w r itten permission
of Ericsson Inc.
TABLE OF CONTENTS
Page
HARDWARE AND HARDWARE OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
NOISE SUPPRESSION KIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
POWER CABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
EXTERNAL SPEAKER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
EXTERNAL ALARM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
RADIO OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
USER INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PUBLIC ADDRESS OPTION OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
TYPE 99 OPTION OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
PAR TS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
ASSEMBLY DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
INTERCONNECTION DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
The software contained in this device is copyrighted by Ericsson Inc. Unpublished rights are reserved under the copyright laws
of the United States.
NOTICE!
LBI-39014B
1
SPECIFICATIONS*
TRANSMITTER
Frequency Range
Low Split Radio 403 to 440 MHz
Mid Split Radio 440 to 470 MHz
High Split Radio 470 to 512 MHz
Output Power 40 Watts (Intermittent duty cycle; EIA 20%)
Audio Sensitivity 110 mV RMS (typical)
Spurious and Harmonics Less than -16 dBm
Audio Distortion 5% (maximum)
Modulation Limiting ± 5 kH z (maximum)
FM Hum and Noise -45 dB (maximum)
Audio Frequency Response Within +1, -3 dB of a 6 dB/octave pre-emphasis curve from
300-3000 Hz
RECEIVER
Frequency Range
Low Split Radio 403 to 440 MHz
Mid Split Radio 440 to 470 MHz
High Split Radio 470 to 512 MHz
Frequency Separation 20 MHz (across band without tuning)
Acceptable Frequency Displacement ± 2.5 kHz (minimum)
Sensitivity (12 dB SINAD) -116 dBm (maximum)
Spurious Rejection -80 dB (maximum)
Image Rejection -70 dB (maximum)
Adjacent Channel Selectivity -80 dB (maximum at ± 25 kHz)
Intermodulation Distortion -75 dB (maximum)
Audio Frequency Response Within +1/-3 dB from 500 Hz to 2500 Hz, 6 dB/octave
attenuation from 300-500 Hz, 12 dB/octave attenuation from
2500-3000 Hz (per EIA/TIA-603)
Audio Output 10 Watts (External Speaker); 4 Watts (Internal Speaker)
7.5 Watts (External Speaker with remote mount kit)
Audio Distortion 5% (maximum at 1 kHz)
Hum and Noise -45 dB (maximum)
Continued
Continued
ENVIRONMENTAL
STANDARD METHODS PROCEDURES
Mil-810C Mil-810D Mil-810E
High Temperature 501.1/Proc 2 501.2/Proc 2 501.3/Proc 2
Low Temperature 502.1/Proc 2 502.2/Proc 2 502.3/Proc 2
Low Pressure 500.1/Proc 1 500.2/Proc 1 500.3/Proc 1, 2
Solar Radiation 505.1/Proc 1 505.2/Proc 1 505.3/Proc 1
Temperature Shock 503.1/Proc 2 503.2/Proc 1 503.3/Proc 1
Vibration 514.2/C8, P1 514.3/Proc 8 514.4/C8, P1
Mechanical Shock 516.2/Proc 1 516.3/Proc 1-6 516.4/Proc 1-6
Humidity 507.1 507.2 507.3
Salt Fog 509.1/Proc 1 509.2/Proc 1 509.3/Proc 1
Blowing Dust 510.1/Proc 1 510.2/Proc 1 510.3/Proc 1
Driven Rain 506.1/Proc 1 506.2/Proc 1 506.3/Proc 1
U.S. Forest Service
Vibration: Methods 7.15.1 and 8.11.1
EIA
Vibration RS152B Method 14.3 and RS206C Method 24.2
Shock: RS152B Method 15 and RS204C Method 25
* These specifications are intended primarily for use by a service technician. Refer to the appropriate Specification Sheet for
complete specifications.
LBI-39014B
2
DESCRIPTION
The UHF
MDX
Mobile Radio is a synthesized, wide
band radio that uses integrated circuits and microcomputer
technology to provide high performance in conventional communications systems. The UHF MDX Mobile radio provides
40 Watts of RF power output in the 403-440, 440-470 or 470512 MHz bands.
This radio operates in the conventional mode and can operate with tone Channel Guard, Digital Channel Guard, or carrier
squelch, depending on personality programming. The Channel
Guard range is 67.0 to 210.7 Hz. Squelch Tail Elimination
(
STE
) is used with Channel Guard to eliminate squelch tails at
the receiving radio by phase shifting the transmitted Channel
Guard tone when the Push-To-Talk (
PTT
) switch is released.
All radio functions are stored in a programmable Electri-
cally Erasable
PROM (EEPROM)
.
• Serial Programming Interface Module TQ3370
• Programming Cable (19B801417P10) TQ3372
• MDX Series Programming Software TQ3346
With the interface equipment and software, the computer
can be used to program (or re-program) customer system frequencies, Channel Guard tones and options. Selection of options is done during radio initialization using the PC
programmer.
The UHF MDX Mobile Radio assembly contains the following circuit boards and assemblies:
• Power Amplifier 19D904792
• RF Board 188D5062
• System Board 19D901891
• Audio/Logic Board 19D903963
• Audio Amplifier Board 19D904025
• Front Cap Assembly 19D904151
The circuit boards are all mounted on a main casting to provide easy access for servicing. Interconnect plugs are used to
connect the boards to eliminate pinched wires and other wiring
problems.
RF BOARD
The RF Board includes the programmable frequency synthesizer, transmitter exciter, receiver front-end and Intermediate Frequency (IF) circuitry.
Synthesizer
The synthesizer circuit generates all transmit and receive
RF frequencies. The synthesizer frequency is controlled by the
microprocessor located on the Audio/Logic Board. Frequency
stability is maintained by a temperature compensated reference
oscillator module. Transmit audio is processed on the
Audio/Logic Board and applied to the synthesizer to modulate
the Voltage Controlled Oscillator (
VCO
) and the Temperature
C
ontrolled Xtal (crystal) Oscillator (
TCXO
). The buffered
VCO output drives both the transmitter exciter and the receiver
mixer.
Transmitter
The transmitter consists of a fixed-tuned exciter module,
PA module and a power control circuit. The PA module provides RF output to drive the antenna. The power control circuit
controls the PA module to maintain constant output power
across the band. The RF output level is internally adjus ta ble f or
rated power. A thermistor control circuit protects the PA from
overheating by linearly reducing the power output level with
increasing temperature.
Receiver
The dual conversion receiver circuit consists of a front-end
section, 45 MHz first IF, a 455 kHz second IF and Frequency
M
odulation (FM) detector. All audio processing and squelch
functions are accomplished on the Audio/Logic Board.
POWER AMPLIFIER BOARD
The PA Board amplifies the RF board output, then connects
it back to the RF board where it is coupled through a
PIN
diode antenna switch, a low-pass filter and a directional coupler
to provide 40 watts power output at the antenna connector.
AUDIO/LOGIC BOARD
The Audio/Logic Board provides all audio and digital processing of the receive and transmit audio for digital processing
by the Logic Board. This board also contains audio filtering,
conventional analog tone processing and the receiver squelch.
The Audio/Logic Board controls the operation of the radio and
digitally processes the receiver and transmit audio. The board
contains a microprocessor and associated memory circuits including an Electrically Programmable Read Only Memory
(
EPROM
) for controlling the processor and a programmable
"
personality
" memory, an EEPROM to store customer frequencies, tones and options. The microprocessor provides control data to the Audio Signal Processor (
ASP
) conventional
tone generation and detection, frequency data for the synthe-
sizer and sends and receives data to/from another microprocessor on the Display Board for the alphanumeric LED display.
FRONT CAP ASSEMBLY
The Front Cap Assembly contains the Audio Amplifier
Board. This board provides audio compression for the received audio in the discriminator internal/external speaker
audio paths. A 10-watt power amplifier is provided on the
board to drive a 4-ohm external speaker or the 8-ohm internal speaker.
SYSTEM BOARD
The system board controls the main input power to the
radio. The
IGNITION SENSE
input lead provides the nec-
essary signals to the
MOSFET
switching circuit. The board
also interfaces all option connections from the internal
boards in the radio with the optional items outside of the radio. All external options for the radio, interconnect to the
System Board through the back of the radio using an optional cable.
ACCESSORIES AND OPTIONS
PC PROGRAMMER OPTIONS
The radio is programmed using an IBM compatible Personal Computer (PC) equipped with an RS-232 serial interface unit and the cable between the PC and the unit. An
auxiliary power supply for the unit is also included but is not
needed to program the radio.
Option TQ3372 provides the MDX UHF radio programming cable between the PC interface unit and the radio microphone jack.
PC PROGRAMMED OPTIONS
Carrier Control Timer (CCT)
The Carrier Control Timer turns off the transmitter after
the microphone PTT switch has been keyed for a pre-programmed time period. A pulsing alert tone warns the operator to unkey and then key again the PTT to continue the
transmission. The timer can be programmed, using the PC
programmer. Any time period between 0 sec onds and 4.1
minutes can be programmed in 10 second increments. The
timer can be enabled or disabled for each channel.
Channel Guard
Channel Guard provides a means of restricting calls to
specified radios through the use of a Continuous Tone Coded
Squelch System (CTCSS), or a Continuous Digital Coded
Squelch System (CDCSS). Tone frequencies range from
67.0 Hz to 210.7 Hz in 0.1 Hz steps. There are 83 standard
PC programmable digital codes. The Channel Guard tone
frequencies and codes are software programmable. Both
tone frequencies and digital codes may be used. These codes
and frequencies are listed in Table 1- Channel Guard Tone
Frequencies and Table 2- Digital Channel Guard Codes.
Table 1 - Standard Channel Guard Tone Frequencies (Hz)
67.0 71.9 74.4 77.0 79.7 82.5 85.4 88.5 91.5 94.8 97.4
100.0 103.5 107.2 110.9 114.8 118.8 123.0 127.3 131.8 136.5 141.3
146.2 151.4 156.7 162.2 167.9 173.8 179.9 186.2 192.8 203.5 210.7
1. Do not use 179.9 Hz or 118.8 Hz in areas served by 60 Hz power distribution systems (or 100.0 Hz or 151.4 Hz in areas supplied with 50Hz power).
Hum modulation of co-channel stations may "false" Channel Guard decoders.
2. Do not use adjacent Channel Guard tone frequencies in systems employing multiple Channel Guard tones. Avoid same-areas co-channel use of adjacent
Channel Guard tones whenever possible. As stated in EIA Standard RS-220, there is a possibility of decoder falsing.
3. To minimize receiver turn-on time delay, especially in system using Channel Guard repeaters or receiver voting, choose the highest usable Channel
Guard tone frequency. Do not use tones below 100 Hz when it is necessary to meet the receiver response time requirements of EIA Standard RS-220.
To reverse the polarity of the digital Channel Guard
codes, in the PC programmer, type I (inverted) before the code number, i.e. I023.)
NOTE
LBI-39014B
3
Squelch Tail Elimination (STE)
STE is used with tone and digital Channel Guard to
eliminate squelch tails. The STE burst is transmitted when
the microphone PTT switch is released. The receiving radio
decodes the burst and mutes the receiver audio for 250 ms.
This mute time allows the transmission to end and to mute
the squelch tail. The radio looks for STE on the receiv ed signal when the microphone is either on or off-hook.
HARDWARE AND HARD WARE
OPTIONS
The location and placement of system hardware options
is shown on the MDX Conventional Mobile Radio Interconnection Diagram 188D5198.
CABLE OPTION PMCD7Z
Cable Option PMCD7Z is used to b ring all option connections from the system Board through the back of the radio to
the outside. This cable is required with all external options.
NOISE SUPPRESSION KIT OPTION PMPD1A
Noise Suppression Kit, Option PMPD1A, consist of filter
19A148539G1 and Installation Manual LBI-31363. This kit is
available for installations where excessive alternator or electrical noises, present on the power cable, do not permit the radio
to operate properly. Refer to the Interconnect Diagram for the
radio and options.
POWER CABLE OPTION PMCD9A
The 18-foot Power Cable Option, PMCD9A
(19B801358P17) is available for installations requiring more
than the standard 9-foot cable.
EXTERNAL SPEAKER OPTION PMZM1T
External Speaker and Cable Option PMZM1T, provides the
user a 5-inch waterproof speaker in a LEXAN housing. Option
PMCC9M is an 18-inch, external speaker cable option
PMCC9M (19A149590P8), included in the option PMCD7Z.
A 16-foot cable option PMCD1W (19A1495 90) is also available.
When using the external speaker, the internal speaker
should be disconnected. The internal/external speaker switch
option PMPL3D allows use of both speakers (Refer to the Interconnection Diagram).
EXTERNAL ALARM HORN RELAY OPTION
PMSU1C
External Alarm Horn Relay Option PMSU1C
(19A705499P1) can sound the vehicle horn when a call is received. The option connects to Pin 13 of cable option
PMCD7Z (19C851585P14) and is enabled through the front
panel switch.
RADIO OPERATION
A complete set of operating instructions for the MDX UHF
radio are provided in Operator’s Manual LBI-39012 . A copy of
LBI-39012 is provided with each radio.
In the conventional mode of operation, the user selects a
channel and communicates on that channel in the conventional
mode. A system refers t o a set of chan nels and a channe l is a
transmit/receive radio frequency pair.
The exact operation of any radio depends upon the operating mode, the programming of the radio and the particular radio system. Most features described in these operating
instructions can be enabled or disabled through programming.
Both of these important factors must be considered when addressing the following instructions.
USER INTERFACE
Operating controls are located on the radio front panel and
microphone.
The Front panel Light Emitting Diode (LED) display provides radio status and communication control information for
the operator. The keypad is used for activation of various features and functions.
Turning The Radio On/Off
The radio is turned On/Off by pressing the PWR button in
the upper left corner of the front panel. To turn the radio OFF
press the PWR button again.
SCAN OPERATION
The SCAN function allow monitoring up to 16 receive
channels. The scanned channels may be any frequency within
the frequency band limits of the radio and may be Channel
Guard protected (tone/digital). All scan functions are retained
in memory, even if the 12 Volt battery is disconnected.
Any channel may be scanned with or without a priority
level. One channel may be programmed for Priority 1 (P1)
and another for Priority 2 (P2) with any or all remaining channels programmed as non-priorities.
RECEIVER SCAN RATE
The scan rate for the radio will vary depending upon the
number of channels programmed into the scan list and whether
or not Channel Guard is programmed. When scanning 16 inactive channels, the priority channels are sampled 11 times/second and the non-priority channels 3 times/second. The scan
rate will be faster when fewer channels are programmed into
can memory.
PRIMARY
CODE
EQUIV ALENT
CODE
PRIMARY
CODE
EQUIV ALENT
CODE
PRIMARY
CODE
EQUIVALENT
CODE
023
025
026
031
032
043
047
051
054
065
071
072
073
074
114
115
116
125
131
132
134
143
152
155
156
162
165
172
174
205
223
226
243
244
245
340 766
566
374 643
355
375 707
520 771
405 675
301
603 717 746
470 701
640
360 721
327 615
534 674
060 737
173
572 702
605 634 714
273
333
366 415
233 660
517 741
416 553
354
057
142 270
135 610
350 475 750
104 557
267 342
176 417
370 554
251
261
263
265
271
306
311
315
331
343
346
351
364
365
371
411
412
413
423
431
432
445
464
465
466
503
506
516
532
546
606
612
624
627
631
236 704 742
227 567
213 736
171 426
427 510 762
147 303 761
330 456 561
321 673
372 507
324 570
616 635 724
353 435
130 641
107
217 453 530
117 756
127 441 711
133 620
234 563 621 713
262 316 730
276 326
222 457 575
237 642 772
056 656
144 666
157 322
224 313 574
067 720
161 345
317 614 751
153 630
254 314 706
075 501
037 560
231 504 636 745
632
565
654
662
664
703
712
723
731
732
734
743
754
036
053
122
145
212
225
246
252
255
266
274
325
332
356
446
452
454
455
462
523
526
123 657
307 362
163 460 607
363 436 443 444
344 471 715
150 256
136 502
235 611 671
447 473 474 744
164 207
066
312 515 663
076 203
137
535
525
253
536
542 653
661
425
655
652
550 626
433 552
521
467 511 672
524 765
513 545 564
533 551
472 623 725
647 726
562 645
NOTE:
Primary codes in bold are unique Ericsson codes.
Table 2 - Digital Channel Guard Codes
LBI-39014B
4
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