User's Manual

RPT 633

Page 5 - 2 TM1184 Issue 1

CONTENTS: (Continued)

FIGURES Page

1. Transmitter Layout: Variables, Links and Test Points 5-4

2. Antenna Cutting 5-9

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INTRODUCTION

1. Section 5 details the dismantling and reassembly instructions, alignment procedure

and the test equipment required to carry out the procedure. The transmitter contains

two printed circuit boards (PCB's). It is recommended that field service engineers

carry one complete VOX Keying Module for on-site replacement and subsequent

base repair of the faulty board.

REPAIR POLICY

2. In Section 6 is a list of spare parts for servicing the transmitter board down to

component level. Passive chip components (capacitors and resistors) are unlikely

to contribute to failure of the equipment in the field. Chip transistors and diodes

should be ordered in strips of 10 or more. A replacement antenna will need to be

cut to length before fitting, according to the information given in paragraph 17.

TEST EQUIPMENT

3. The following test equipment is required to carry out the repair procedure.

C DC Power Supply 18V, 1A.

C Absorption Wattmeter, 5W 420-470MHz,

C Thruline RF Power Meter 5W, 420-470MHz with Power Attenuator 5W,

20-30dB.

C Frequency Counter 500MHz, accuracy 1 part in 10 or better.

C Audio Signal Generator.

C Modulation Meter.

C Oscilloscope.