E4B10

Which of the following methods measures intermodulation distortion in an SSB transmitter?

1. AModulate the transmitter using two RF signals having non-harmonically related frequencies and observe the RF output with a spectrum analyzer
2. BModulate the transmitter using two AF signals having non-harmonically related frequencies and observe the RF output with a spectrum analyzer
3. CModulate the transmitter using two AF signals having harmonically related frequencies and observe the RF output with a peak reading wattmeter
4. DModulate the transmitter using two RF signals having harmonically related frequencies and observe the RF output with a logic analyzer

Pick an answer to check it.