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What is component 4 in figure T-3?

Figure T-3 from the official question pool: a schematic diagram of an electronic circuit with parts numbered 1 through 4.

AntennaՃիշտ պատասխան
Transmitter
Dummy load
Ground

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Component 4 is the antenna in Figure T-3. The feed line is component 1, while a transmitter, dummy load, and ground are not the numbered part at the output of the coupler.

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