Specifications

Section B
RF Interface
B.1 Introduction
This section covers the RF Interface board. Topics include func-
tion, location, block diagram description, detailed circuit de-
scription, troubleshooting, and removal\replacement.
NOTE: Parts List for this board is covered in Section VII.
B.2 Function
The RF Interface board contains circuits for selecting Synthe-
sizer Interface A or optional Synthesizer Interface, combined
transmitter RF switching and interfacing, and active Frequency
Synthesizer fault sensing. The RF output of this board goes to
the Buffer Amplifier via the Driver Combiner Motherboard.
B.3 Oscilloscope Waveform Plots
Actual oscilloscope waveform plots of key troubleshooting
points are located at the end of this section. All plots were taken
at 100 kW with no modulation at 540 kHz carrier frequency.
B.4 Location
The RF Interface board is located in the right front compartment
on the upper left side. (SEE VIEW 10)
B.5 Block Diagram Description
Refer to Figure B-1, RF Interface Block Diagram, for the follow-
ing discussion.
Figure B-1. RF Interface Block Diagram
888-2339-002 B-1
Warning: Disconnect primary power prior to servicing.