FM IF Rejection
FM IF rejection measures a tuner's resistance to interference entering at its intermediate frequency, usually 10.7 MHz.
A tuner converts the selected radio signal to an intermediate frequency for processing. An unwanted signal arriving at that frequency can produce interference. Rejection is expressed in decibels; a larger comparable value indicates greater suppression of this particular unwanted response.
FM IF Rejection — Tuner
IF rejection helps describe immunity to an interfering signal at the tuner's intermediate frequency. It is not a measure of audio bandwidth or how well the tuner separates neighbouring stations. A strong result addresses one interference mechanism, rather than guaranteeing clean reception in every location.
Compare figures measured using equivalent procedures and retain any minimum or 'better than' qualifier. Image rejection and spurious-response rejection cover other unwanted responses and cannot replace this value. Antenna placement, desired-signal strength and the actual interfering signals still determine whether the stated immunity becomes relevant in use.