CROSS MODULATION

Transmitters and Receivers Glossary

Transmitters and Receivers — Cross Modulation

Information on Cross Modulation

Cross modulation is caused by non-linearity in the RF amplifier or the mixer and results in the transfer of the amplitude modulation of a strong, unwanted carrier onto the wanted carrier. Cross-modulation and can be minimised by linear operation of the RF stage and by increasing its selectivity to reduce the number of signals entering the receiver. Normally, cross-modulation problems are confined to the AM broadcast bands and therefore do not create much of a problem in communication receivers. Cross-modulation does not occur in an FM receiver, which is unaffected by amplitude variations in the wanted signal.

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