Figure 104. Waveguide operating modes.
18.
When a circulator is used with microwave communication equipment, its purpose is to
a.
cause circulation of the RF energy in a rectangular waveguide.
b.
provide air circulation around a multicavity klystron power amplifier.
c.
permit more than one transmitter and receiver to use a common antenna.
d.
circulate the liquid coolant around a multicavity klystron power amplifier.
19.
Assume that a microwave station's RF system contains isolators, mode filters, directional couplers, and
mode launchers. The purpose of the mode launcher is to
a.
reduce waveguide reflections.
b.
change the RF energy from one mode to another.
344 L2
101
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