Tait T880 II Series Adjustment Manual page 33

M880-00
2 T885 Circuit Operation
This section provides a basic description of the circuit operation of the T885 receiver.
Note: Unless otherwise specified, the term "PGM800Win" used in this and follow-
ing sections refers to version 2.00 and later of the software.
Refer to Section 6 where the parts lists, grid reference index and diagrams will provide
detailed information on identifying and locating components and test points on the
main PCB.
The following topics are covered in this section.
Section
2.1 Introduction
2.2 Receiver Front End
2.3 Mixer
2.4 IF Circuitry
2.5 Noise Mute (Squelch)
2.6 Carrier Mute
2.7 Audio Processor
2.8 Power Supply And Regulators
2.9 Microcontroller
2.10 Synthesised Local Oscillator
2.11 VCO
2.12 Received Signal Strength Indicator (RSSI)
Figure
2.1 T885 High Level Block Diagram
2.2 T885 Front End, IF and Mute Block Diagram
2.3 T885 Audio Processor Block Diagram
2.4 T885 Power Supply And Regulators Block Diagram
2.5 T885 Microcontroller Block Diagram
2.6 T885 Synthesiser Block Diagram
2.7 T885 RSSI Block Diagram
Copyright TEL
T885 Circuit Operation
Title
Title
B2.1
Page
2.3
2.4
2.5
2.5
2.6
2.6
2.7
2.8
2.9
2.10
2.11
2.12
Page
2.3
2.4
2.7
2.8
2.9
2.10
2.12
10/07/00