M850-00
T858/859 Circuit Operation
D2.1
Copyright TEL 31/09/98
2 T858/859 Circuit Operation
This section provides a basic description of the circuit operation of the T858 and T859
power amplifiers.
Refer to Section 5 where the parts lists, grid reference index and diagrams will provide
detailed information on identifying and locating components. Refer also to Figure 3.3
and Figure 3.4 which show the location of the main adjustment controls.
The following topics are covered in this section.
Section Title Page
2.1 Introduction 2.3
2.2 RF Circuitry 2.4
2.3
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
Control Circuitry
Power Control
T859 Driver Power Level
Thermal Protection
Forward And Reverse Power Alarms
Forward And Reverse Power Metering
T859 Fan Control Circuitry
2.5
2.6
2.6
2.6
2.7
2.7
2.7
Figure Title Page
2.1
2.2
2.3
2.4
T858/859 High Level Block Diagram
T858/859 RF Circuitry Block Diagram
T858/859 Control Circuitry Block Diagram
T859 Fan Control Logic Diagram
2.3
2.4
2.5
2.7