Michael Terrell wrote:


Adjacent channel interference like that is caused by the IF bandwidth
and the skirt. The IF transformers aren't brick wall, the amplitude
drops away slowly outside the desired bandwidth.


** FM receivers have multiple stages of IF band limiting making the falloff very sharp outside the needed 200kHz.


That allows a local
station to be strong enough to cause problems.


** Nope - the FM detector ( ratio or quadrature) is also tuned to the centre of the IF strip and will not demodulate an out of band signal.


..... Phil