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GV5/GV3.5 OPERATIONS & MAINTENANCE MANUAL DESCRIPTION
PAGE 3.1.6 VERSION 0.2 2014-07-23
Module Control/Interface PWB
See also electrical schematics Figures SD-9 through SD-16. The module control/interface PWB:
 interfaces with all RF power module inputs and outputs, except for the RF output.
 interfaces between the controller module (A4) and the rest of the transmitter, distributing
forward and reflected power samples, exciter control signals, and metering for reject load
assemblies and the RF drive splitter/changeover assembly.
 distributes RF drive power, PA voltage and PA bias voltage to the RF power modules.
 monitors critical parameters of the RF power modules, such as RF drive sample, reject power
sample, heatsink temperature and cooling fan speed. Monitoring circuits determine if a
parameter is out of tolerance and generate the necessary control signal to compensate for the
out of tolerance condition or to inhibit the RF power module’s associated power supplies.
 applies control signals to the power supply modules fromthe controller and also monitors
status signals and critical meters from the power supply modules and applies them to the
controller. The controller can inhibit the power supply modules, as necessary (RF off, PS Temp
alarm), or enable the power supply modules (RF on).
 generates a sample of the PA voltage applied to each RF power module and applies it to the
control/monitor stage.
 samples the RF power module meters and generates the necessary PA bias voltages for each
RF power module’s PAs.
Combiner/Filter
The 5 kW combiner/filter (A12) accepts the RF outputs from two RF power modules and uses a 3 dB
hybrid coupler to provide a single RF output. The 3 dB hybrid coupler accepts the outputs of two RF
power modules. The equal amplitude, 90° out-of-phase (quadrature) RF signals are combined at the 3
dB hybrid coupler output and applied to a 5 kW low pass filter before being applied to the output
power probe (A15).
Any amplitude or phase imbalance betweenthe 3 dB hybrid coupler inputs causes a proportional signal
to be applied to the reject load assembly’s 5kW Rej Ld Pwr (1/2) via J5.