M8SL2-00-002-812 T854 Circuit Operation C2.3
© Copyright Tait Electronics Limited August 2004. All rights reserved.
2.1 Introduction
The individual circuit blocks which make up the T854 are:
• synthesiser
• VCO
• audio processor
• drive amplifier
• 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 Figure 2.1 .
Refer to the circuit diagrams in Section 6.2 for more detail.
Figure 2.1 T854 High Level Block Diagram
Ramp
Gen.
Time
Delay
Time
Delay
Time
Delay
Audio
Processor
Synthesiser
+22dBm
Reference
Oscillator
12.8MHz
Microphone
Line
Transformer
Lock
Detect
PIN
Switch
Power
Control
Drive
Amp.
PA
VCO
Gate
Directional
Coupler
Low Pass
Filter
Exciter
Output
(+30dBm to
+33dBm)
Transmitter
Output
(25W)
Tx Reg
&
To Next Page
Loading...
