FCC Commercial Element 8 pool, section 1

Subelement A

RADAR Principles

Section 1

Marine RADAR Systems

81A1

Choose the most correct statement containing the parameters which control the size of the target echo.

Correct Answer
A.
Transmitted power, antenna effective area, transmit and receive losses, RADAR cross section of the target, range to target.
B.
Height of antenna, power radiated, size of target, receiver gain, pulse width.
C.
Power radiated, antenna gain, size of target, shape of target, pulse width, receiver gain.
D.
Magnetron gain, antenna gain, size of target, range to target, wave-guide loss.

81A1

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81A2

Which of the following has NO effect on the maximum range capability?

A.
Carrier frequency.
Correct Answer
B.
Recovery time.
C.
Pulse repetition frequency.
D.
Receiver sensitivity.

81A2

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81A3

What type of transmitter power is measured over a period of time?

Correct Answer
A.
Average.
B.
Peak.
C.
Reciprocal.
D.
Return.

81A3

Measured over a period of time is the Average. KD9TIP

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81A4

What RADAR component controls timing throughout the system?

A.
Power supply.
B.
Indicator.
Correct Answer
C.
Synchronizer.
D.
Receiver.

81A4

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81A5

Which of the following components allows the use of a single antenna for both transmitting and receiving?

A.
Mixer.
Correct Answer
B.
Duplexer.
C.
Synchronizer.
D.
Modulator.

81A5

Which of the following components allows the use of a single antenna for both transmitting and receiving?

(B). Duplexer.

Duplexer let send/receive happen at the same time, so you don't have to wait until someone says "Over." To do this, they used different but closely related frequencies.

For more info, please see Wikipedia's article on Duplexer

A solid Duplexer info is on Repeater Builder site, article Duplexers

YouTube: A complete video well explains the topic from TRX Lab channel, #141 Basics of Duplexers for radio repeaters; function, alignments and tests

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81A6

The sweep frequency of a RADAR indicator is determined by what parameter?

A.
Carrier frequency.
B.
Pulse width.
C.
Duty cycle.
Correct Answer
D.
Pulse repetition frequency.

81A6

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