Radio Amateur Quiz Canadian License

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Question A-005-004-009

What measurement can be made of a single-sideband phone transmitter's amplifier by performing a two-tone test using an oscilloscope?

Correct Answer

Its linearity

Explanation

A two-tone test allows visual assessment of an SSB amplifier's linearity by observing the RF envelope on an oscilloscope. Non-linearity causes intermodulation distortion (IMD) products, visible as 'flat-topping' or 'crossover distortion' on the envelope, or as distinct new frequencies on a spectrum analyzer.

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