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The PFN - Pulse-Forming Network pulse-modulates the transmitting Magnetron's output, so Answer D. is the right answer.
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The PFN - Pulse-Forming Network pulse-modulates the transmitting Magnetron's output, so Answer A. is the right answer.
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These are used to switch the transmitter's very high voltage (rf) ON & OFF in response to a control signal.
Thyratron's are the older Tube style, SCR (Silicon Controlled Rectifiers) are the more modern Solid State device, but they both do the same thing.
Turn ON/OFF or "Modulates the signal"
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"Correct wavefrom" means a wave pulse modulated (shaped) as the pulse generated by the PFN - Pulse-Forming Network, so Answer B. is he right answer.
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