M8SL2-00-002-812 T854 Circuit Operation C2.1
© Copyright Tait Electronics Limited August 2004. All rights reserved.
2 T854 Circuit Operation
This section provides a basic description of the circuit operation of the T854 transmitter.
Note: Unless otherwise specified, the term “PGM800Win” used in this and follow-
ing sections refers to version 4.02 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 and Regulator Circuits 2.10
2.7 Transmit Timers 2.11
2.8 T854 Drive Amplifier, Fan Control and PA 2.12
To Next Page
Loading...
Need help?
General
