[RFI] powerline noise that seems to peak in frequency

[Richard (Rick) Karlquist]

This should have read "This is not UNusual ..."

Richard (Rick) Karlquist wrote:
> 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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