Paul wrote: 

>with my kitchen LED lights ON, that RFI drops 10 dB or more.
>With the lights OFF, out of the sockets, or the circuit breaker off,
>the RFI is 10+ dB stronger

Could it be that those lights have bypass capacitors in the base?  When you connect them to the power they might knock down other noise on the line as well as their own noise.


Steve WD8DAS  
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