Advanced Qualification · A-005 Transmitters, modulation and processing · 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?
- A Two harmonically related tones are fed in, and the output is observed on an oscilloscope
- B Two harmonically related tones are fed in, and the output is observed on a distortion analyzer
- C Two non-harmonically related tones are fed in, and the output is observed on distortion analyzer
- D Two non-harmonically related tones are fed in, and the output is observed on an oscilloscope
Correct answer: D — Two non-harmonically related tones are fed in, and the output is observed on an oscilloscope. From the official ISED question bank, verified word for word.
Why
To check if a single-sideband transmitter distorts your voice, you feed it two audio tones that do not share a simple mathematical relationship, then watch the result on an oscilloscope. The full explanation — and one for every question — is in Pro.
Practise this section
Transmitters, modulation and processing: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.