8-B-13: Modulation
8-13B1:
In a solid-state RADAR modulator, the duration of the transmitted pulse is determined by:
The pulse forming network.
The thyratron.
The magnetron voltage.
The trigger pulse.
8-13B2:
The modulation frequency of most RADAR systems is between:
60 and 500 Hz.
3000 and 6000 Hz.
1500 and 7500 Hz.
1000 and 3000 Hz.
8-13B3:
A shipboard RADAR uses a PFN driving a magnetron cathode through a step-up transformer. This results in which type of modulation?
Pulse modulation.
Frequency modulation.
Amplitude modulation.
Continuous Wave (CW) modulation.
8-13B4:
In a pulse modulated magnetron what device determines the shape and width of the pulse?
Pulse Forming Network.
Thyratron.
LC parallel circuit.
Dimensions of the magnetron cavity.
8-13B5:
What device(s) may act as the modulator of a RADAR system?
Thyratron or a silicon-controlled rectifier (SCR).
Magnetron.
Klystron.
Video amplifier.
8-13B6:
The purpose of a modulator in the transmitter section of a RADAR is to:
Provide the correct waveform to the transmitter.
Improve bearing resolution.
Prevent sea return.
Control magnetron power output.
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