"Lars Brandt" wrote in message
...
Hi Steve
I don't think the problem is feedback vibration from the speaker. I have
listen even in headphones and then the speaker is quite.It is when I turn
the tuning knob I can hear a rassle sound even in the headphones.

Are you using an external antenna with a decent RF ground? Not unusual to
hear encoder noise when using the atached whip and internal preamp.
Grounding the RX will eliminate this.

Dale W4OP