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WARNING: Disconnect and lockout AC primary power prior to servicing
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The Wilkinson combiner in the Low Band module is a foreshortened Wilkinson
combiner. Resistors are used in the Wilkinson divider and combiner circuits to provide
isolation between ports.
The Wilkinson dividers two outputs feeds the two 2-way Wilkinson microstrip/stripline
dividers on the 2X2-Way Divider assembly. The 2X2-Way Divider assemblies four
outputs feeds the four class AB amplifiers.
The outputs of the four amplifiers feed into the two 2-way Wilkinson combiners on the
2X2-way Combiner assembly. The output of the two combiners feeds into the two
inputs of the 2-way Wilkinson Combiner assembly. The output of this combiner passes
through a directional coupler to the RF output jack. The directional coupler sends a
voltage sample of the output port reflected power to the PCM system.
The Low Band and High Band PA modules are rated at 285 watts average.
Figure 8-4 PA Module Block Diagram
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