Radio Amateur Quiz Canadian License

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Question A-003-003-009

Which two instruments are needed to measure FM receiver sensitivity for a 12 dB SINAD ratio (signal + noise + distortion over noise + distortion)?

Correct Answer

Calibrated RF signal generator with FM tone modulation and total harmonic distortion (THD) analyzer

Explanation

To measure SINAD, a precisely modulated RF signal (from the generator) is fed to the receiver, and the audio output's signal, noise, and distortion components are measured (with the THD analyzer, often incorporating a notch filter).

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