Tait T850 II Series User Manual

M850-00 T856/857 Circuit Operation C2.1
Copyright TEL 31/09/98
2 T856/857 Circuit Operation
This section provides a basic description of the circuit operation of the T856 transmitter
and T857 exciter.
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 parts list and diagrams for the VCO PCB are in Part E.
The following topics are covered in this section.
Section Title Page
2.1 Introduction 2.3
2.2 Microcontroller 2.4
2.3
2.3.1
Synthesised Local Oscillator
Two Point Modulation
2.5
2.6
2.4
2.4.1
VCO
VCO Supply
2.7
2.7
2.5
2.5.1
2.5.2
2.5.3
2.5.4
2.5.5
Audio Processor
General
Audio Inputs
Keying Inputs
Compressor (Automatic Level Control (ALC))
Outputs To Modulators
2.8
2.8
2.8
2.9
2.9
2.9
2.6 Power Supply & Regulator Circuits 2.10
2.7 Transmit Timers 2.11
2.8 T856 Drive Amplifier & PA 2.12
2.9 T857 Exciter Drive Amplifier 2.13

Tait T850 II Series Specifications

General

Brand	Tait
Model	T850 II Series
Category	Accessories
Language	English