Motorola CP160

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Chapter 2

THEORY OF OPERATION

1.0 Introduction

This Chapter provides a detailed theory of operation for the UHF1 circuits in the radio. Schematic

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

2.0 UHF (403-440MHz) Receiver

The UHF receiver covers the range of 403-440 MHz and provides switchable IF bandwidth for use

with 20/25/30 kHz or 12.5 kHz channel spacing systems. The receiver is divided into two major

blocks, as shown in Figure 2-1.

■ Front End

■ Back End

Figure 2-1 UHF Receiver Block Diagram

Demodulator

Crystal

Filter

1st Mixer

Amp

Preselector

Filter

Interstage

Filter

Recovered Audio

RSSI

RX from

Antenna Switch

Inj Filter

First LO

from Synthesizer

Ceramic

Resonator

Cer Fltr

Switching

BW_SEL

12.5kHzFilter

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