Uhf3 (465-495Mhz) Receiver; Theory Of Operation; Introduction - Motorola CP040 Detailed Service Manual

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Table of Contents

This Chapter provides a detailed theory of operation for the UHF circuits in the radio. Schematic

diagrams and board layout diagrams are included in Chapter 4 in this Section of the manual.

UHF3 (465-495MHz) Receiver

The UHF receiver covers the range of 465-495 MHz and provides switchable IF bandwidth for use

with 20/25 kHz or 12.5 kHz channel spacing systems. The receiver is divided into two major blocks,

as shown in Figure 2-1.

Antenna Switch

from Synthesizer

Recovered Audio

Figure 1-1 UHF Receiver Block Diagram

12.5kHzFilter