[RFI] Power Line Noise Specific to 15 meters

[Pete Smith N4ZR]

Thanks, Mike - As to your latter point, I think this qualifies as line 
noise because it is present all across 10, 15 and 20, just at much lower 
amplitude except on 15, but it certainly could be a resonance thing.

73, Pete N4ZR
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On 10/3/2021 8:04 PM, Mike Martin wrote:
> Couple of things that will change a noise from what's considered 
> normal. The source of the noise or where the noise is radiating from 
> to get to your antenna could be in a position that allows it to arrive 
> at your antenna at a null in the wavelength for that particular 
> frequency that it isn't received and arrive at the peak of the 
> wavelength on another frequency. This is very common and I see this 
> almost daily. The other situation is the noise that you think is line 
> noise, which is always broadband in nature, may not be a line noise 
> and maybe something that does not radiate or transmit at other 
> frequencies.
>
> Be safe,
> Mike Martin
> RFI Services
> 51 W Bay Front Rd
> Lothian, MD 20711
> 240-508-3760
> On Oct 3, 2021, at 4:01 PM, Pete Smith N4ZR <pete.n4zr at gmail.com> wrote:
>
>     This is a bit of a puzzle, to me anyway.  With my tribander pointed in
>     one direction (west), I have extremely bad what sounds like line noise.
>     This noise is not audible on 20 meters, on 10 meters, or on lower bands
>     using my Carolina Windom.  I won't be able to get out and try to DF it
>     for 10 days or so, but I always thought line noise got progressively
>     worse as you went down in frequency toward its fundamental.  What am I
>     missing, or what should I be looking for?
>