If the signals of two repeater transmitters mix together in one or both of their final amplifiers and unwanted signals at the sum and difference frequencies of the original signals are generated and radiated, what is this called?

Why

When two strong signals meet inside a transmitter's final amplifier, they can mix like ingredients in a blender to create new, unwanted frequencies that are the sum or difference of the originals. The full explanation — and one for every question — is in Pro.

Practise this section

Transmitters, modulation and processing is section A-005 of the Advanced exam: Transmitters, modulation and processing: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.

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