Duplicate FM station

Thread Starter

ticassse

Joined Dec 11, 2017
11
Hi,

I have an old Pioneer SX-202 receiver that have an issue with the FM, all stations are duplicated a few khz apart and both signal are mono.
I tried the alignment procedure with no luck.

Anybody know what could cause that kind of behavior ?

Thanks
A.
 

Audioguru again

Joined Oct 21, 2019
5,183
The bandwidth of the input and IF tuning is about 200kHz for low distortion stereo. An ordinary bunch of tuned LC circuits would make a bandwidth that is too narrow then maybe this receiver tunes some LC circuits at -100kHz and tunes other LC circuits at +100kHz but it causes peak sensitivities at these separated frequencies.
 

BobTPH

Joined Jun 5, 2013
5,772
I just tried my car radio. On weak stations it will pick up a noisy signal on two adjacent frequencies, 200 KHz apart. On stronger ones, it only picks them up on one. Weird.

Bob
 
Top