T885 Circuit Operation; Introduction - Tait T880 II Series Adjustment Manual

M880-00
2.1

Introduction

Mixer
Front
End
Synthesised
Local
Oscillator
12.8MHz
Master
Oscillator
The T885 receiver consists of a number of distinct stages:
• front end
• mixer
• synthesised local oscillator
• IF
• audio processor
• mute (squelch)
• regulator circuits
• received signal strength indicator (RSSI).
These stages are clearly identifiable in
tion 6 for further detail.
Copyright TEL
Mixer
45MHz 455kHz
IF IF
Second
Local
Oscillator
Figure 2.1 T885 High Level Block Diagram
Figure

T885 Circuit Operation

Limiter/
Detector
RSSI
2.1. Refer to the circuit diagrams in Sec-
B2.3
Noise
Mute
Speaker
Audio
Processor
600W
Line
Carrier
Mute
10/07/00