Motorola GM-950 User Manual

Band Specific Information 5-i
Chapter 5
Band Specific Information
Table of Contents
Table of Contents
Chapter Page
5A UHF (403-470MHz) ............................................................................. 5A.1-i
5B VHF (136-174MHz) .............................................................................. 5B.1-i
5C Midband (66-88MHz)............................................................................ 5C.1-i

Motorola GM-950 Specifications

General

Brand	Motorola
Model	GM-950
Category	Radio
Language	English

Summary

Chapter 5: Band Specific Information

5C: Midband (66-88MHz) Band

Details for the Midband (66-88MHz) band specific information.

Chapter 5C: 66-88MHz Specific Information

5C.1: Model Chart and Test Specifications

Provides model details and test specifications for the 66-88MHz band.

5C.2: Radio Tuning Procedure

Detailed steps for tuning the radio for the 66-88MHz band.

5C.3: Theory of Operation

Explains the operational principles and internal workings of the radio.

5C.4: PCB/Schematic Diagrams and Parts Lists

5C.1: Model Chart and Test Specifications

Model Chart

Presents a chart detailing various radio models and their configurations.

Service Options

General Technical Specifications

Transmitter Specifications

Details transmitter performance parameters like output power and modulation.

Receiver Specifications

Details receiver performance parameters like sensitivity and selectivity.

5C.2: Radio Tuning Procedure

Midband Tuning Procedure: General Setup

Adjusting Transceiver Alignment Controls (Softpots)

PA Bias Voltage Adjustment

Procedure for setting the Power Amplifier bias voltage.

Battery Threshold Configuration

Transmitter Power Adjustment

Steps to set the transmitter power levels.

Reference Oscillator Alignment

Procedure to ensure proper radio operation by aligning the reference oscillator.

Front-End Filter Tuning

Squelch Adjustment

Sets the signal-to-noise ratio for squelch opening.

Transmit Modulation Balance (Compensation)

Balances modulation sensitivity for signaling schemes.

Transmit Deviation Limit Adjustment

Sets the maximum deviation of the carrier signal.

5 Tone (SELECT 5) Transmit Deviation

DTMF Transmit Deviation

5C.3: Theory of Operation

Controller Board Audio and Signalling Circuits

Transmit Audio Circuits

Receive Audio Circuits

Receive Signalling Circuits

Midband Specific Circuit Description: Receiver Front-End

Midband Specific Circuit Description: Mixer and IF Section

Midband Specific Circuit Description: Transmitter Power Amplifier (PA)

Explains the 5-25W Power Amplifier stages and operation.

Midband Specific Circuit Description: Frequency Synthesis

Details the frequency synthesis subsystem and its components.