3-O-090: RADAR Theory
3-90O1:
What is the normal range of pulse repetition rates?
500 to 2,000 pps.
2,000 to 4,000 pps.
1,000 to 3,000 pps.
500 to 1,000 pps.
3-90O2:
The RADAR range in nautical miles to an object can be found by measuring the elapsed time during a RADAR pulse and dividing this quantity by:
12.346 µs.
0.87 seconds.
1.15 µs.
1.073 µs.
3-90O3:
What is the normal range of pulse widths?
.05 µs to 1.0 µs.
.05 µs to 0.1 µs.
1.0 µs to 3.5 µs.
2.5 µs to 5.0 µs.
3-90O4:
Shipboard RADAR is most commonly operated in what band?
SHF.
VHF.
UHF.
EHF.
3-90O5:
The pulse repetition rate (prr) of a RADAR refers to the:
Pulse rate of the magnetron.
Reciprocal of the duty cycle.
Pulse rate of the local oscillator.
Pulse rate of the klystron.
3-90O6:
If the elapsed time for a RADAR echo is 62 microseconds, what is the distance in nautical miles to the object?
5 nautical miles.
87 nautical miles.
37 nautical miles.
11.5 nautical miles.
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