Tait T880 II Series Adjustment Manual page 91

M880-00
2 T881 Circuit Operation
This section provides a basic description of the circuit operation of the T881 transmitter.
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 Microcontroller
2.3 Synthesised Local Oscillator
2.3.1 Two Point Modulation
2.4 VCO
2.4.1 VCO Supply
2.5 Audio Processor
2.5.1 General
2.5.2 Audio Inputs
2.5.3 Keying Inputs
2.5.4 Compressor (Automatic Level Control (ALC))
2.5.5 Outputs To Modulators
2.6 Power Supply & Regulator Circuits
2.7 Transmit Timers
2.8 Power Control Circuit & PA
Copyright TEL
T881 Circuit Operation
Title
C2.1
Page
2.3
2.4
2.5
2.6
2.7
2.7
2.8
2.8
2.8
2.9
2.9
2.9
2.10
2.11
2.12
10/07/00