8-28C: Miscellaneous Flashcards
Receiving Systems (2 cards)
8-28C1
The purpose of the discriminator circuit in a RADAR set is to:
A. Discriminate against nearby objects.
B. Discriminate against two objects with very similar bearings.
C. Generate a corrective voltage for controlling the frequency of the klystron local oscillator.
D. Demodulate or remove the intelligence from the FM signal.
ANSWER C
The discriminator circuit in a RADAR is part of the automatic frequency control circuitry. It detects any change of the magnetron or klystron frequency so that their difference in frequency maintains the intermediate frequency.
8-28C4
The condition known as “glint” refers to a shifting of clutter with each RADAR pulse and can be caused by a:
A. Improperly functioning MTI filter.
B. Memory failure.
C. Low AFC voltage.
D. Interference from electrical equipment.
ANSWER A
The term “glint” refers to patches of close-in sea clutter randomly appearing on the indicator. This is a problem in the MTI circuit, somtimes caused by misadjustement, that can cause randomsea returns to look like moving targets.
