Harris Atlas DVL400, Техническое руководство

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4-26 888-2473-001 2/25/03
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation ATLAS Series™
Figure 4-11 Combiner Reject Load Locator
4.4.6 RF Monitor Board
The RF Monitor Board is located just above the PA Modules in the rear of the
transmitter. The RF Monitor is responsible for the following:
a.
Communicating with the System Controller via the internal Controller Area
Network bus
b.
Monitoring the power into the reject power loads from the modules
c.
Monitoring system forward RF power
d. Monitoring system reflected RF power
e.
Maintaining hardware trip points for reject loads and forward and reflected
power sense ports to generate an exception on the transmitter parallel bus in
the event of a fault while in Life Support mode
f. Calculation of VSWR based on Forward and Reflected power samples (Not
applicable in Life Support mode)
While this board utilises the micro module, the CPLD is responsible for all of the
critical power and VSWR overload protection. The micro module is basically just
responsible for communicating information to the Main Controller.