Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-006-002

How does intermodulation interference between two repeater transmitters usually occur?

1. A When they are in close proximity and the signals cause feedback in one or both of their final amplifiers
2. B When the signals are reflected out of phase by aircraft passing overhead
3. C When they are in close proximity and the signals mix in one or both of their final amplifiers
4. D When the signals are reflected in phase by aircraft passing overhead

Correct answer: C — When they are in close proximity and the signals mix in one or both of their final amplifiers. From the official ISED question bank, verified word for word.

Why

Intermodulation happens when two strong transmitters sit close together, causing their radio waves to enter the final amplifier of one unit. 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.

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