Ericsson ORION User manual

LBI-38903B
Maintenance Manual
ORION
136-174 MHz
SCAN AND SYSTEM
MOBILE RADIO
TABLE OF CONTENTS
Synthesizer/Receiver/Exciter . . . . . . . LBI-38910
Power Amplifier . . . . . . . . . . . . . . LBI-39002
PA Interface . . . . . . . . . . . . . . . . LBI-38994
Control Logic/IF Board . . . . . . . . . . LBI-39003
Control Units . . . . . . . . . . . . . . . LBI-38992
Assemblies . . . . . . . . . . . . . . . . LBI-38909
Service Section . . . . . . . . . . . . . . LBI-38993
ericssonz
Ericsson Inc.
Private Radio Systems
Mountain View Road
Lynchburg, Virginia 24502
1-800-528-7711 (outside USA, 804-528-7711) Printed in U.S.A.

Copyright© October 1993 Ericsson GE Mobile Communications Inc. Continued
TABLE OF CONTENTS
Page
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SYNTHESIZER/INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PROGRAMMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
TRANSMITTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
RECEIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
LOGIC FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SYSTEM INTERCONNECTION DIAGRAMS:
U.S.A. LOW POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
U.S.A. HIGH POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
EUROPEAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
ILLUSTRATION
Figure 1 - ORION Mobile Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SPECIFICATIONS*
Frequency Range: 136-153 MHz
150-174 MHz
Battery Drain:
Receiver Squelched 1.1 Amperes at 13.8 Volts
Unsquelched 3.0 Amperes at 13.8 Volts (15 Watts Output)
Transmitter 25 Watts 12 Amperes at 13.2 Volts
50 Watts 14 Amperes at 13.6 Volts
110 Watts 28 Amperes at 13.4 Volts
Frequency Stability: 0.0002% depending on model
Temperature Range: -30°C (-22°F) to +60°C (+140°F)
Duty Cycle: 100% Receive, 14% Transmit
Transmitter
Transmit Output Power: 25W/50W/110W
Conducted Spurious: -85 dB
Modulation: ±5 kHz
Audio Sensitivity: 55 to 110 millivolts
Audio Frequency Characteristics: Within +1 dB to -3 dB of a 6 dB/octave pre-emphasis 300
Hz and within +1 dB to -4.5 dB (+1 to -3 dB for Euro) of a
6 dB/octave pre-emphasis 3000 Hz per EIA standards.
Post-limiter filter per FCC and EIA.
Distortion: Less than 2% (1000 Hz)
Deviation Symmetry: 0.3 kHz maximum
Maximum Frequency Separation: 136-153 MHz, 17 MHz
150-174 MHz 24 MHz
Microphone Load Impedance: 600 Ohms
Power Adjust Range: 100% to 50% of rated power (U.S.A. Models)
100% to 24% of rated power (Euro Models)
RF Output Impedance: 50 Ohms
FM Noise: 50 dB
Receiver
Audio Output: 15 Watts with less than 3% distortion
(To 4.0 ohm speaker)
Sensitivity: 0.35 µV (STD)
12 dB SINAD (IEIA method)
Selectivity:
EIA Two-Signal Method
(25 kHz Channels)
95 dB (STD)
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 incorportated 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 express written permission ofEricsson Inc.
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 Ericsson Inc. Unpublished rights are reserved under the copyright
laws of the United States.
NOTICE!
This manual covers Ericsson and General Electric products manufactured and sold by Ericsson Inc.
NOTICE!
LBI-38903
1

DESCRIPTION
The synthesized ORION mobile radio combinations are
completely solid-state, utilizing microcomputer technology
and integrated circuits to provide high-quality, high-
reliability radios. Standard combinations may be equipped
with:
•Microcomputer Controlled Frequency Synthesizer
•Up to 16 Channels
•0.0002% Frequency Stability
•Other Structured Options
The basic radio consists of three printed wiring boards
mounted in a cast aluminum frame. The three boards are:
1. The Control Logic/IF board,
2. The Frequency Synthesizer/Receiver/Exciter board,
3. The Power Amplifier board.
The radio is of double-layer construction with tuning ad-
justments easily accessible from the top of the radio.
The Control Logic/IF Board located on the top of the ra-
dio, while the Power Amplifier and the Synthesizer/Re-
ceiver/Exciter boards are located on the bottom.
SYNTHESIZER/INTERCONNECT
The synthesizer consists of a microcomputer,Electrically
Erasable Programmable Read Only Memory (EEPROM), a
frequency synthesizer IC, transmit and receive Voltage Con-
trolled Oscillator’s (VCO) and associated circuitry. The fre-
quency synthesizer under control of the microcomputer
generates all transmit and receive Radio Frequencies (RF).
The EEPROM stores binary data for all radio frequen-
cies, Channel Guard tones/digital codes and the timing func-
tion of the Carrier Control Timer (CCT). The
microcomputer accesses the EEPROM and provides the cor-
rect WALSH bits to the Channel Guard circuitry to generate
the correct Channel Guard tone or digital code on a per-
channel basis.
PROGRAMMING
The EEPROM allows the radio to be programmed or repro-
grammed as needed to adapt to changing system requirements.
Radio Frequencies, Channel Guard tone and digital codes and
the CCT function can be reprogrammed.
The EEPROM can be reprogrammed through the radio
front connector using a personal computer. This programmer
allows all information to be loaded simultaneously.
Programming instructions are provided in the respective
Programmer Maintenance Manuals.
TRANSMITTER
The transmitter consists of the exciter, frequency synthe-
sizer, transmitter VCO and a Power Amplifier (PA) assembly.
The PA assembly consists of a PA board mounted on a heat
sink assembly. The PA board also contains an antenna switch-
ing diode and a low-pass filter.
Audio and Channel Guard circuitry for the transmitter is lo-
cated on the Logic Board.
RECEIVER
The receiver consists of the frequency synthesizer, RX
VCO, injection amplifiers, front end, IF and limiter detector.
Audio, squelch and Channel Guard circuitry for the receiver is
located on the Logic Board.
LOGIC FUNCTION
A microprocessor on the Control Logic/IF board controls
the frequency synthesizer, the TX ON/OFF, the decoding of
CTCSS tones, the generation of CTCSS tones,... etc. The audio
processor circuitry of the transmitter and the receiver are lo-
cated on the Control Logic/IF Board. Squelch circuitry and a
connection to the digital AEGIS circuit is also located on the
Control Logic/IF Board.
OPERATION
Complete operating instructions for the ORION Two-Way
Radio are provided in Operator’s Manual LBI-38888 for the
control unit used.
MAINTENANCE
The Service Section in maintenance manual LBI-38993
contains the maintenance information to service this radio. The
Service Section includes:
•Dissassembly Procedures
•Replacement of IC’s, chip capacitors and resistors
•Alignment procedures for the transmitter and receiver
•Troubleshooting Procedures and wave forms
Figure 1 - ORION Mobile Radio
SPECIFICATIONS* - Cont.
Receiver - Cont.
Spurious Response: -100 dB (STD)
Intermodulation 30 kHz: -85 dB (STD)
Maximum Frequency Separation: 136-153 MHz .... 17 MHz
150-174 MHz .... 24 MHz
Frequency Response: Within +1, -3 dB of 6 dB/octave de-emphasis from 300 to
3000 MHz (1000 Hz reference)
RF Input Impedance: 50 Ohms
Hum/Noise ratio:
Unsquelched -50 dB
Squelched -70 dB
Channel Spacing: 30 kHz
REGULATORY APPROVALS
The following equipment authorized numbers have been granted:
COUNTRY REGULATORYAPPROVAL
UNITED STATES FCC AXATR - 312-A2/B2 (30/50W)
AXATR - 313-A2/B2 (110W)
CANADA DOC TR - 312-A2/B2 (30/50W)
TR - 313-A2/B2 (110W)
*These specifications are intended primarily for use of the service technician. Refer to the appropriate Specifications Sheet
for the complete specifications.
LBI-38903
2

SYSTEM INTERCONNECTION DIAGRAM
U.S.A. LOW POWER
LBI-38903
3

SYSTEM INTERCONNECTION DIAGRAM
U.S.A. HIGH POWER
LBI-38903
4

SYSTEM INTERCONNECTION DIAGRAM
EUROPEAN
LBI-38903
5