8-C-28: Miscellaneous
8-28C1:
The purpose of the discriminator circuit in a RADAR set is to:
Generate a corrective voltage for controlling the frequency of the klystron local oscillator.
Discriminate against nearby objects.
Discriminate against two objects with very similar bearings.
Demodulate or remove the intelligence from the FM signal.
8-28C2:
The MTI circuit:
Is a filter, which blocks out stationary targets, allowing only moving targets to be detected.
Acts as a mixer in a RADAR receiver.
Is used to monitor transmitter interference.
Will pick up targets, which are not in motion.
8-28C3:
Where is a RF attenuator used in a RADAR unit?
Between the magnetron and the AFC section of the receiver.
Between the antenna and the receiver.
Between the magnetron and the antenna.
Between the AFC section and the klystron.
8-28C4:
The condition known as “glint” refers to a shifting of clutter with each RADAR pulse and can be caused by a:
Improperly functioning MTI filter.
Memory failure.
Low AFC voltage.
Interference from electrical equipment.
8-28C5:
An ion discharge (TR) cell is used to:
Protect the receiver mixer during the transmit pulse.
Protect the transmitter from high SWRs.
Lower the noise figure of the receiver.
Tune the local oscillator of the RADAR receiver.
8-28C6:
When the receiver employs an MTI circuit:
Only moving targets will be displayed.
The receiver gain increases with time.
The receiver AGC circuits are disabled.
Ground clutter will be free of “rabbits.”
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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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