User Manual

System Components
Power Amplifier (PA) Control Board
1. The P.A. control board contains all of the hardware and software necessary
to provide the following control functions. See Figure 3 for block diagram.
a. Variable DC control voltage that drives the P.A. pre-amp to control the
output power level of the P.A.
b. Bias supply generation for amplifier configurations requiring external bias.
c. Monitoring of forward power, reflected power, temperature, VSWR
conditions, D.C. power levels, and various alarm conditions.
d. Fan control and sensing.
e. DC power regulation.
f. Input power detection.
g. P.A. keying and deactivation.
h. Front panel Meter display.
Version 3 3-6 07/18/01