Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-006-004
If a receiver tuned to 146.70 MHz receives an intermodulation product signal whenever a nearby transmitter transmits on 146.52, what are the two most likely frequencies for the other interfering signal?
- A 146.34 MHz and 146.61 MHz
- B 146.88 MHz and 146.34 MHz
- C 146.01 MHz and 147.30 MHz
- D 73.35 MHz and 239.40 MHz
Correct answer: A — 146.34 MHz and 146.61 MHz. From the official ISED question bank, verified word for word.
Why
Intermodulation happens when two strong signals mix in a receiver to create new, unwanted frequencies. 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.