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Hum while TX #bitx20

 

I have the V5 uBITX. All seems to be okay but in TX I get a big hum. The issue is even worse when keying. I disconnected the mic so that can't be an issue. Replaced the powersuppy also, that doesn't help. When I touch the heatsinks of the irf510 it get worse.

It looks like a ground loop issue but even with nothing connected the hum is there.
RX is perfect.

Any ideas?

Thanks, Werner pa3gyv
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