8-C-24: Automatic Frequency Control - AFC
8-24C1:
The AFC system is used to:
Control the frequency of the klystron.
Control the frequency of the magnetron.
Control the receiver gain.
Control the frequency of the incoming pulses.
8-24C2:
A circuit used to develop AFC voltage in a RADAR receiver is called the:
Discriminator.
Peak detector.
Crystal mixer.
Second detector.
8-24C3:
In the AFC system, the discriminator compares the frequencies of the:
Magnetron and klystron.
PRR generator and magnetron.
Magnetron and crystal detector.
Magnetron and video amplifier.
8-24C4:
An AFC system keeps the receiver tuned to the transmitted signal by varying the frequency of the:
Local oscillator.
Magnetron.
IF amplifier stage.
Cavity duplexer.
8-24C5:
A RADAR transmitter is operating on 3.0 GHz and the reflex klystron local oscillator, operating at 3.060 GHz, develops a 60 MHz IF. If the magnetron drifts higher in frequency, the AFC system must cause the klystron repeller plate to become:
More negative.
More positive.
Less positive.
Less negative.
8-24C6:
What component is block 50 in Fig. 8A1?
Discriminator.
IF amplifier.
AFC amplifier.
Crystal detector.
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Color key:
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● = Unseen
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● = Weak
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● = Review
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● = Learned
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● = Incorrect answer
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