LBI-38904A

Mobile Communications

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

Maintenance Manual

Printed in U.S.A.

LBI-38904

TABLE OF CONTENTS

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SYNTHESIZING INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PROGRAMMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TRANSMITTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RECEIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SYSTEM CONTROL FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SYSTEM INTERCONNECTION DIAGRAMS:

U.S.A. LOW POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

U.S.A. HIGH POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EUROPEAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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ILLUSTRATION

Figure 1 - ORION Mobile Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Frequency Range:

Battery Drain:

Receive

Transmitter

Squelched

Unsquelched

20 Watts

35/40 Watts

80/100 Watts

Frequency Stability:

Temperature Range:

Duty Cycle:

Transmitter

Transmit Output Power:

Conducted Spurious:

Modulation:

Audio Sensitivity:

Audio Frequency Characteristics:

SPECIFICATIONS*

403-440 MHz

440-470 MHz

470-512 MHz

1.1 Amperes at 13.8 Volts

3.0 Amperes at 13.8 Volts (15 Watts Output)

12 Amperes at 13.2 Volts

14 Amperes at 13.6 Volts

25/28 Amperes at 13.4 Volts

0.0002% depending on model

-30

°

C (-22

°

F) to +60

°

C (+140

°

F)

100% Receive, 14% Transmit

20W/35W/40W/80W/100W

-85 dB

±

4.5 kHz

55 to 110 millivolts

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:

Deviation Symmetry:

Maximum Frequency Separation:

Microphone Load Impedance:

Power Adjust Range:

RF Output Impedance:

FM Noise:

Receiver

Audio Output:

(To 4.0 ohm speaker)

Sensitivity:

12 dB SINAD (IEIA method)

Selectivity:

EIA Two-Signal Method

(25 kHz Channels)

Spurious Response:

Intermodulation 25 kHz:

Maximum Frequency Separation:

Frequency Response:

RF Input Impedance:

Hum/Noise ratio:

Unsquelched

Squelched

Channel Spacing:

LBI-38904

Less than 2% (1000 Hz)

Less than 5% (3000 Hz)

0.3 kHz maximum

403-440 MHz 37 MHz

440-470 MHz 30 MHz

470-512 MHz 42 MHz

600 Ohms

100% to 50% of rated power (U.S.A. Models)

100% to 30% of rated power (Euro Models)

50 Ohms

45 dB

15 Watts with less than 3% distortion

0.35

µ

V (STD)/0.22

µ

V (PRE)

-85 dB (STD)-80 dB (PRE)

-100 dB (STD)/-90 (PRE)

-85 dB (STD)/-80 dB (PRE)

403-440 MHz .... 37 MHz

440-470 MHz .... 30 MHz

470-512 MHz .... 42 MHz

Within +1, -3 dB of 6 dB/octave de-emphasis from 300 to

3000 MHz (1000 Hz reference)

50 Ohms

-50 dB

-70 dB

30 kHz

* These specifications are intended primarily for use of the service technician. Refer to the appropriate Specifications

Sheet for the complete specifications.

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LBI-38904

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 adjustments 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/Receiver/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 Controlled Oscillator’s (VCO) and associated circuitry. The frequency synthesizer under control of the microcomputer generates all transmit and receive Radio Frequencies (RF).

The EEPROM stores binary data for all radio frequencies, Channel Guard tones/digital codes and the timing function of the Carrier Control Timer (CCT). The microcomputer accesses the EEPROM and provides the correct WALSH bits to the Channel Guard circuitry to generate the correct Channel Guard tone or digital code on a perchannel basis.

PROGRAMMING

The EEPROM allows the radio to be programmed or reprogrammed 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 synthesizer, 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 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 CONTROL 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 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.

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Figure 1 - ORION Mobile Radio

LBI-38904

LBI-38904 SYSTEM INTERCONNECTION DIAGRAM LBI-38904

U.S.A. LOW POWER

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LBI-38904 SYSTEM INTERCONNECTION DIAGRAM LBI-38904

U.S.A. HIGH POWER

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LBI-38904 SYSTEM INTERCONNECTION DIAGRAM LBI-38904

EUROPEAN

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