FCC Commercial Element 8 pool, section 11

Subelement B

Transmitting Systems

Section 11

Transmitting Systems

811B1

The magnetron is used to:

Correct Answer
A.
Generate the output signal at the proper operating frequency.
B.
Determine the shape and width of the transmitted pulses.
C.
Modulate the pulse signal.
D.
Determine the pulse repetition rate.

811B1

The magnetron is a type of vacuum tube used in microwave ovens and radar systems to generate electromagnetic waves at microwave frequencies. It operates as an oscillator, producing a continuous wave (CW) output signal at a specific frequency, typically in the gigahertz range.

Microwave ovens, for example, use magnetrons to generate microwaves, which are then directed into the cooking chamber to heat the food. The magnetron converts electrical energy into electromagnetic radiation, and its design allows it to generate the output signal at the desired operating frequency.

Mnemonic: "Magnetron Magic!"

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811B2

The purpose of the modulator is to:

A.
Transmit the high voltage pulses to the antenna.
Correct Answer
B.
Provide high voltage pulses of the proper shape and width to the magnetron.
C.
Adjust the pulse repetition rate.
D.
Tune the Magnetron to the proper frequency.

811B2