>I've never seen an FM receiver with AGC. RF intensity
>should have no effect on FM audio levels. AM however,
>this would be true. FM receivers do have AFC to
>keep the receiver from loosing lock.

Post mixer I would agree with you, but I have seen gain control on the RF
stage to get good IM performance. I seem to recall some early FM IF chips
had a signal strength output to do this.

If there is no AGC at all that may even exacerbate the problem if he is
feeding a very strong signal into the receiver. The IM resultant may be
producing a similar problem.

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