Element 8: Ship Radar Techniques

effective 6/25/2009

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8-A-04: Power, Pulse Width, PRR

8-4A1: A pulse RADAR has a pulse repetition frequency (PRF) of 400 Hz, a pulse width of 1 microsecond, and a peak power of 100 kilowatts. The average power of the RADAR transmitter is:

40 watts.

25 watts.

250 watts.

400 watts.



8-4A2: A shipboard RADAR transmitter has a pulse repetition frequency (PRF) of 1,000 Hz, a pulse width of 0.5 microseconds, peak power of 150 KW, and a minimum range of 75 meters. Its duty cycle is:

0.0005

0.5

0.05

0.005



8-4A3: A pulse RADAR transmits a 0.5 microsecond RF pulse with a peak power of 100 kilowatts every 1600 microseconds. This RADAR has:

An average power of 31.25 watts.

A PRF of 3,200.

A maximum range of 480 kilometers.

A duty cycle of 3.125 percent.



8-4A4: If a RADAR transmitter has a pulse repetition frequency (PRF) of 900 Hz, a pulse width of 0.5 microseconds and a peak power of 15 kilowatts, what is its average power output?

6.75 watts.

15 kilowatts.

13.5 watts.

166.67 watts.



8-4A5: What is the average power if the RADAR set has a PRF of 1000 Hz, a pulse width of 1 microsecond, and a peak power rating of 100 kilowatts?

100 watts.

10 watts.

1,000 watts.

None of these.



8-4A6: A search RADAR has a pulse width of 1.0 microsecond, a pulse repetition frequency (PRF) of 900 Hz, and an average power of 18 watts. The unit’s peak power is:

20 kilowatts.

200 kilowatts.

180 kilowatts.

2 kilowatts.





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8-A-03: Frequency and Wavelength
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Element 8: Ship Radar Techniques
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8-A-05: Range, Pulse Width, PRF