[RFI] powerline noise that seems to peak in frequency

[Richard (Rick) Karlquist]

This is not usual at all, due to resonances in the power
wires.  It is surprising how sharp they are.

Rick N6RK

Pete Smith wrote:
> Today, listening on 10m, I noticed that whenever I tuned into the 28400-475 
> range, there would be a marked increase in what sounded very much like 
> ordinary powerline noise.  Trouble is, I'm not aware of any mechanism that 
> could account for this "peaking" in a certain frequency range.  I have 
> checked the rx, and it has the same apparent sensitivity in that range as 
> elsewhere in 10m.
> 
> 73, Pete N4ZR
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