Element 8: Ship Radar Techniques

effective 6/25/2009

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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.



Figure 8A1

8-24C6: What component is block 50 in Fig. 8A1?

Discriminator.

IF amplifier.

AFC amplifier.

Crystal detector.





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8-C-23: Detectors - Video Amplifiers
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Element 8: Ship Radar Techniques
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8-C-25: Sea Clutter - STC