Which of the following methods measures intermodulation distortion in an SSB transmitter?
Modulate the transmitter using two RF signals having non-harmonically related frequencies and observe the RF output with a spectrum analyzer
Modulate the transmitter using two AF signals having non-harmonically related frequencies and observe the RF output with a spectrum analyzer✓Bonne réponse
Modulate the transmitter using two AF signals having harmonically related frequencies and observe the RF output with a peak reading wattmeter
Modulate the transmitter using two RF signals having harmonically related frequencies and observe the RF output with a logic analyzer
Explication
The standard two-tone test applies two equal audio tones that are not harmonically related to the transmitter's audio input and examines the RF output on a frequency-domain display. Because the tones are not harmonically related, any combination products that appear must have been created by nonlinearity in the transmitter rather than being present in the drive.