Ericsson LBI-38848D User Manual
LBI-38848D
PARTS LIST
Maintenance Manual
DUAL FORMAT MDX
806 - 870 MHz
MOBILE RADIO
DUAL FORMAT MDX RADIO ASSEMBLY
SYMBOL PART NUMBER DESCRIPTION
APPLICATION ASSEMBLY
19D904183
— — — — ASSEMBLIES — — —
A1 19D902123G22 RF BOARD
A3 19D901891G2 SYSTEM BOARD
A4 19D904025G2 AUDIO AMPLIFIER BOARD
A5 19D903963G1 AUDIO/LOGIC BOARD
19C851822G1 PA BOARD
— — — — — KITS — — — — —
344A4253G1 Hardware Kit (No. 1)
344A4255G7 Hardware Kit (No. 2)
— — — — — CABLES — — — —
19A705301P6 Cable, Antenna
19B801467P1 Cable, J705 to J151
19B801467P2 Cable, J5 to J105
19B801454P36 Cable, RX to J104
19A705235P3 Cable, Ribbon, J901 on Audio Amplifier
to J902 on System Board
19B801454P38 Cable, Antenna to J7
19B801454P37 Cable, TX to J101
19B802397P1 Cable, Handset
— — — MISCELLANEOUS — —
19D904027P1 Casting
19C337683G2 Bracket
19D904185G1 Cover, Bottom
19D904186G1 Cover, Top
19D904187G1 Panel, Front
19B801358P18 Cable, 9 Foot, Power
19B235310P10 Nameplate, Combination
ISSUE 1
ericssonz
TABLE OF CONTENTS
RF BOARD . . . . . . . . . . . . . . . . . LBI-38849
SYSTEM BOARD . . . . . . . . . . . . . LBI-38842
AUDIO/LOGIC BOARD . . . . . . . . . . LBI-38843
AUDIO AMPLIFIER BOARD . . . . . . . LBI-38844
FRONT CAP ASSEMBLY . . . . . . . . . LBI-38850
LBI-38974
PA BOARD . . . . . . . . . . . . . . . . . LBI-38302
SERVICE SECTION . . . . . . . . . . . . LBI-38851
COMPONENTS, ADDED, DELETED OR CHANGED BY PRODUCTION CHANGES
*
Ericsson Inc.
Private Radio Systems
Mountain V iew Road
Lynchb ur g, Virginia 24502
1-800-528-7711 (Outside USA, 804-528-7711) Printed in U.S.A.
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.
NOTICE!
The software contained in this device is copyrighted by the Ericsson Inc. Unpublished rights are reserved under the
copyright laws of the United States.
LBI-38848D
TABLE OF CONTENTS
Page
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
RF BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
S y nthesizer Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Transmi t Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Receiver Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
POWER AMPLIFIER BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
AUDIO/LO GIC BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SYSTEM BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
FRONT CAP ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
ACCESSORIES AND OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
PC PROGRAMMER OPTI ONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
PC PROGRAMMED OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Carrier Control Timer (CCT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Channel Guard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
S q uelch Tail Elimination (STE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Retry Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
HARDWARE AND HARDWARE OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
OPTION CABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
NOISE SUPPRESSION KIT OPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
POWER CA BLE OPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
EXTERNAL SPEAKER OPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
EXTERNAL ALARM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SYSTEM DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
EDACS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CONVENTIONAL MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
GE-MARC V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Operational Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Idle Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Ready Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
GLOSSARY OF GE-MAR C V SYSTEM TERMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
RADIO OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
USER INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ALERT TONES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
EDACS APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
GE-MARC APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ASSEMBLY DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
INTERCONNECT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Back
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 c hanges will be incorporated into ne w 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 express written permission of Ericsson Inc.
Copyright© December 1992 , E ricsso n GE Mo bile Communications Inc.
1
LBI-38848D
SPECIFICATIONS*
GENERAL
Regulatory Approval
FCC (United States) AXATR-311-A2
DOC (Canada) TR-311
Operating Voltage 13.8 Volts ±20%
Battery Drain
Receiver (13.8 Vdc)
Off 0.01 Amperes (maximum)
Squelched 0.75 Amperes (maximum)
Unsquelched 2.0 Amperes (maximum at 10 Watts audio,
External Speaker)
Transmitter (13.8 Vdc) 11 Amperes (maximum at 25 Watts RF)
Channel Spacing 25 kHz (12.5 kHz NPSPAC)
Frequency Stability ±1.5 PPM (±0.00015%)
Temperature Range -30C to +60C (-22F to +140F)
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
TRANSMITTER
Frequency Range 806.0125-824.9875 MHz
Output Power 25 Watts (Intermittent duty cycle; EIA 20%)
Audio Sensitivity 125 mVrms (typical)
Spurious and Harmonics <-16 dBm
Audio Distortion 5% maximum
Modulation Limiting +5 kHz maximum (4 kHz max 821.000 - 824.9875 and
866.000 - 869.9875 MHz)
FM Hum and Noise -45 dB
Audio Frequency Response Within +1, -3 dB of a 6 dB/octave pre-emphasis curve
Per EIA Standards from 300-3000 Hz
RECEIVER
Frequency Range 851.0125-869.9875 MHz
Acceptable Frequency Displacement ±2.5 kHz minimum
Sensitivity (12 dB SINAD) -113 dBm minimum
Spurious Response 70 dB minimum
Adjacent Channel Selectivity 68 dB minimum at ±25.0 kHz
Intermodulation Distortion 65 dB minimum
Audio Frequency Response Within +2, -8dB of a 6 dB/octave de-emphasis curve
from 300 -2700 Hz
Audio Output 10 Watts (External Speaker); 4 Watts (Internal Speaker)
Audio Distortion 5% maximum at 1 kHz
These specifications are intended primarily for use by se rvice personnel. Refer to the a ppropriate Specification Sheet
*
for complete specifications.
GENERAL DESCRIPTION
The Dual Format MDX Mobile Radio is a synthesized,
wideband radio that uses integrated circuits and microcomputer technology to provide high performance trunked operation. This radio operates in the Enhanced Digital Access
Communications System (EDA CS
vironments and in conventional communications systems. The
radio provides 2 5 Watts of RF power output in th e 80 6.0125 -
824.9875 MH z and 851.0125-869 .9875 MHz bands. The receiver operates in the 851.0125-869.9875 MHz band.
All radio functions are stored in a programmable Electrically Erasable
grammable using an IBM compatible personal computer with
the following equipment:
Serial Program mi ng Interface Modu l e TQ3370
•
Programming Cable (19B801417P10) TQ3372
•
MDX Series Programming
•
Software (EDACS) TQ3373
MDX Series Programming
•
Software (GE-MARC only) 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 Dual Format MDX Mobile Radio assembly contains the following circuit boards and assemblies:
Power Amplifier Boar d 19C851822G1
•
RF Board 19D902123G22
•
System Board 19D901891G2
•
Audio/Logic Board 19D903963G1
•
Audio Amplifier Board 19D904025G2
•
Front Cap Assembl y 19D904151G1
•
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-are as co-channel use of adjacent
Channel Guard tones whenever possible. As stated in EIA Standard RS-220, there is a possibility of decoder fal sing.
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.
PROM (EEPROM
®
), GE-MARC trunking en-
). The radio is field pro-
Table 1 - Standard Tone Frequencies (Hz)
The circuit boards are all mounted on a main casting to
provide easy access for servicin g. Interc on nect plu gs ar e used
to connect the boards to eliminate pinched wires and other
wiring problems.
RF BOARD
The RF Board incl ud es t he programmabl e frequency s ynthesizer, transmitter exciter , recei ver front end and IF circuitry .
Synthesizer
The synthesizer circuit generates all transmit and receive
RF frequenci es. The sy nthesiz er fre quenc y is contr olled by t he
microproces s or located on the Au di o/Logic Board. F r equency
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 VCO and TCXO. The buf fered VCO output dri ves b oth the
transmitter exciter and the receiver mixer.
Transmitter
The transmitter consists of a fixed-tuned exciter module,
a 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 a constant output
power across the band. The RF output le vel is internally adjustable for rated power. Thermistors in the control circuit protect
the PA from overheating by reducing the power output level.
Receiver
The dual conv ersion recei ver circuit consists of a front end
section, 45.3 MHz first IF, a 455 kHz second IF, and FM
detector. All audio processing and squelch functions are accomplished on th e Au di o Board.
POWER AMPLIFIER BOARD
The PA board (19C851822G1) amplifies the RF board
output then connects it back to the RF board where it is coupled
through a PIN diode antenna switch, the low-pass filter and the
directional coupler to provide 25 watts power output at the
antenna conn ect or.
2
LBI-38848D
Table 2 - Digital Channel Guard Codes
PRIMARY
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
NOTE:
Primary codes in bold are unique Ericsson codes.
EQUIVALENT
CODE
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
PRIMARY
CODE
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
EQUIVALENT
CODE
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
PRIMARY
CODE
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
EQUIVALENT
CODE
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
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. The board also contains
audio filtering, conv entional analog tone processing, and the
receiver squelch. The Audio/Logic Board controls the operation of the radio and digitally processes the receive and
transmit audio. The board contains a microprocessor and
associated memory circuits including an EPROM for controlling the processor and a programmable "personality"
memory (an Electrically Erasable PROM - EEPROM) to
store customer freq uencies, tones and options. The micro processor provides control data to the Audio Signal Processor (ASP), conventional tone generation and detection,
frequency data for the synthesizer, and sends and receives
data to another microprocessor on the Display Board for the
LCD.
SYSTEM BOARD
The system board controls the main input power to the
radio. IGNITION SENSE input lead provides the necessary
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.
FRONT CAP ASSEMBLY
The Front Cap Assembly contains the Audio Amplifier
Board. The Au dio Ampl ifie r Boar d prov ides c ompres sion of
the microphone audio. It also provides audio com pression
for the received audio in the discriminator and internal/external speaker audio paths. A 10-watt power amplifier is
provided on the board to drive a 4-ohm internal/external
speaker.
ACCESSORIES AND OPTIONS
PC PROGRAMMER OPTIONS
The radio is programmed using an IBM compatible
personal computer equipped with a RS-232 port. Option
TQ3370 provides the RS-232 serial interface unit an d 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 p rovides the radio prog ramming cable
between the PC interface unit and the radio microphone jack.
MDX PC programming software Option TQ3346 (GEMARC only) or TQ3373 (EDACS) is provided in both 3.5
and 5.25 inch diskettes.
PC PROGRAMMED OPTIONS
Carrier Control Timer (CCT)
The Carrier Control Timer turns off the transmitter af ter
the microphone push-to-talk (PTT) switch has been keyed
for a pre-programmed time period. A pulsing alert tone
warns the operator to unkey and then rekey the PTT to
continue the transmission. The timer can be programmed,
using the PC programmer. Any time periods between 30
seconds and 7.5 minutes can be programmed in 30 second
increment s. The timer can be enable d or disabled for each
channel.
Channel Guard
Channel Guard provides a means of restricting calls to
specific 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. Ther e 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 T able 1 - Channel Guard Tone
Frequencies and Table 2 - Digital Channel Guard Codes.
NOTE
To reverse the polarity of the digital Channel Guard
codes in the PC programmer, type I ("inverted") before
the code number, i.e. I023.
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 is released. The receiving radio decodes
the burst and mutes the receiver audio for 250ms. This mute
time allows the transmission to end and to mute the squelch
tail. The radio looks for STE on the received signal when the
microphone is either on or off-hook. The STE is enabled for
transmit and / or r eceive by P C p rogramming the r a d i o’s personality .
Retry Option
If no channel is free, the radio can be programmed to
activate the Call Retry state and display ’RETRYING’ in the
display. Retrying causes the radio to re vert to Idle m ode and
scan for an incoming call while trying to acquire a free
repeater approximately every 5 seconds for a 2 minute period.
3
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