Ericsson ORION User manual

LBI-38904A
Mobile Communications
Maintenance Manual
ORION
UHF
SCAN AND SYSTEM
MOBILE RADIO
TABLE OF CONTENTS
Synthesizer/Receiver/Exciter . . . . LBI-39033
Power Amplifier . . . . . . . . . . . LBI-39034
PA Interface . . . . . . . . . . . . . LBI-38994
Control Logic/IF Board . . . . . . . LBI-38907
Control Units . . . . . . . . . . . . . LBI-38992
Assemblies . . . . . . . . . . . . . . LBI-38909
Service Section . . . . . . . . . . . . LBI-38908
Printed in U.S.A.

TABLE OF CONTENTS
Page
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SYNTHESIZING INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PROGRAMMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
TRANSMITTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
RECEIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SYSTEM CONTROL 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: 403-440 MHz
440-470 MHz
470-512 MHz
Battery Drain:
Receive Squelched 1.1 Amperes at 13.8 Volts
Unsquelched 3.0 Amperes at 13.8 Volts (15 Watts Output)
Transmitter 20 Watts
35/40 Watts
80/100 Watts
12 Amperes at 13.2 Volts
14 Amperes at 13.6 Volts
25/28 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: 20W/35W/40W/80W/100W
Conducted Spurious: -85 dB
Modulation: ±4.5 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 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)
Less than 5% (3000 Hz)
Deviation Symmetry: 0.3 kHz maximum
Maximum Frequency Separation: 403-440 MHz 37 MHz
440-470 MHz 30 MHz
470-512 MHz 42 MHz
Microphone Load Impedance: 600 Ohms
Power AdjustRange: 100% to 50% of rated power (U.S.A. Models)
100% to 30% of rated power (Euro Models)
RF Output Impedance: 50 Ohms
FM Noise: 45 dB
Receiver
Audio Output: 15 Watts with less than 3% distortion
(To 4.0 ohm speaker)
Sensitivity: 0.35 µV (STD)/0.22 µV (PRE)
12 dB SINAD (IEIA method)
Selectivity: -85 dB (STD)-80 dB (PRE)
EIA Two-Signal Method
(25 kHz Channels)
Spurious Response: -100 dB (STD)/-90 (PRE)
Intermodulation 25 kHz: -85 dB (STD)/-80 dB (PRE)
Maximum Frequency Separation: 403-440 MHz .... 37 MHz
440-470 MHz .... 30 MHz
470-512 MHz .... 42 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
*These specifications are intended primarily for use of the service technician. Refer to the appropriate Specifications
Sheet for the complete specifications.
LBI-38904 LBI-38904
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DESCRIPTION
The synthesized ORION mobile radio combinations are
completely solid-state, utilizing microcomputer technology
and integrated circuits to provide high-quality, high-reliabil-
ity 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 is located on the top of the
radio, while the Power Amplifier and the Synthesizer/Re-
ceiver/Exciter boards are located on the bottom of the radio.
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 re-
programmed as needed to adapt to changing system require-
ments. 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) assem-
bly. The PA assembly consists of a PA board mounted on a
heat sink assembly. The PA board also contains an antenna
switching diode and a low-pass filter.
Audio and Channel Guard circuitry for the transmitter is
located on the Control Logic/IF 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 Control Logic/IF Board.
SYSTEM CONTROLFUNCTION
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 located 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-38908
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
A mechanical layout for the radio is found in ORION
Assemblies Maintenance Manual LBI-38909.
Copyright© October 1993, Ericsson GE Mobile Communications Inc.
Figure 1 - ORION Mobile Radio
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SYSTEM INTERCONNECTION DIAGRAM
U.S.A. LOW POWER
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SYSTEM INTERCONNECTION DIAGRAM
U.S.A. HIGH POWER
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SYSTEM INTERCONNECTION DIAGRAM
EUROPEAN
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