333. What is the name of the condition that occurs when the signals of two transmitters in close proximity mix together in one or both of their final amplifiers, and unwanted signals at the sum and difference frequencies of the original transmissions are generated?

Intermodulation interference occurs when signals from multiple transmitters mix in a nonlinear amplifier, generating unwanted sum and difference frequencies. This differs from amplifier desensitization, which is receiver overload; neutralization, a circuit stabilization technique; and adjacent channel interference, which results from signals on nearby frequencies.