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Silicon · 1st Dec 2022, 12:01 pm

The symptom of the noise increasing with RF signal level reminds me of the characteristics of 'modulation hum'.
There are many potential causes.

When you have exhausted all the other good suggestions you might want to try checking all the RF and IF bypass and decoupling capacitors.

1st Dec 2022, 12:01 pm	#13
Silicon Nonode Join Date: Jun 2007 Location: Coulsdon, London, UK. Posts: 2,167	Re: Cossor 524 rustling noise on FM The symptom of the noise increasing with RF signal level reminds me of the characteristics of 'modulation hum'. There are many potential causes. When you have exhausted all the other good suggestions you might want to try checking all the RF and IF bypass and decoupling capacitors.