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Subelement A
Section 4
Power, Pulse Width, PRR
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:
• 25 watts.
40 watts.
• 250 watts.
• 400 watts.

Duty Cycle = Pulse Width / PRF

Given: Pulse Width = 1 microsecond = 1 * 10^(-6) seconds PRF (Pulse Repetition Frequency) = 400 Hz

Duty Cycle = 1 * 10^(-6) seconds / 400 Hz Duty Cycle = 0.0000025

Now, to calculate the average power:

Average Power = Peak Power * Duty Cycle Average Power = 100,000 watts * 0.0000025 Average Power = 40 watts

So, the correct answer is that the average power of the RADAR transmitter is 40 watts.

Mnemonic: "DutyCyclePower"

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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:
• 0.5
• 0.05
• 0.005
0.0005

Duty Cycle = (1000 Hz)x(0.0000005 sec)

Duty Cycle = 0.0005

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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.

Pavg = 0.0003125 x 100,000 kW

Pavg = 31.25 W

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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?
• 15 kilowatts.
• 13.5 watts.
6.75 watts.
• 166.67 watts.

Pavg = 0.00045 x 15,000 kW

Pavg = 6.75 W

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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?
• 10 watts.
100 watts.
• 1,000 watts.
• None of these.

Pavg = 0.001 x 100,000 kW

Pavg = 100 W

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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:
• 200 kilowatts.
• 180 kilowatts.
20 kilowatts.
• 2 kilowatts.

Ppeak = 18 W / 0.0009

Ppeak = 20,000 W or 20 kW

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