Radio Amateur Quiz Canadian License

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Question A-005-004-007

When testing the amplitude linearity of a single-sideband transmitter what audio tones are fed into the microphone input and on what kind of kind of instrument is the output observed?

Correct Answer

Two non-harmonically related tones are fed in, and the output is observed on an oscilloscope

Explanation

To check SSB transmitter linearity, two audio tones (e.g., 700 Hz and 1900 Hz) are input. The RF output envelope is viewed on an oscilloscope, or the spectrum on a spectrum analyzer, to look for distortion products.

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