Introduction - Tait T880 II Series Adjustment Manual

M880-00
2.1

Introduction

The individual circuit blocks which make up the T881 are:
• synthesiser
• VCO
• audio processor
• power amplifier (RF power module)
• voltage regulators.
Each of these circuit blocks is set in its own shielded compartment, formed as an inte-
gral part of the main chassis.
The configuration of the circuit blocks may be seen on a functional level in
Refer to the circuit diagrams in Section 6.2 for more detail.
Reference
Oscillator
12.8MHz
Microphone
Line
Transformer
Tx Reg
Copyright TEL
5.5dB
Pad
+20dBm
Synthesiser
Lock
Detect
Audio
Processor
&
Gate
Figure 2.1 T881 High Level Block Diagram
T881 Circuit Operation
7.5dB
PIN PA
Switch Module
Pad
+6dBm
Power
Control
Time
Delay
Time
Ramp
Delay
Gen.
C2.3
Figure 2.1.
Directional Low Pass
Coupler Filter
Transmitter
Output
(5W)
Time
VCO
Delay
10/07/00