[Elecraft] Noise Nuller

[David Gilbert]

All true.

And of course if the noise is in the same direction as the signal you 
want to receive these spatial discrimination techniques aren't much 
help.  I found that out early on when testing the first version of my 
NoiseNuller app.  I was listening to the local solar panel noise while 
also transmitting a "desired signal" using a third antenna, but I didn't 
get much discrimination at all.  It turns out that the spatial phase was 
the same for both, and when I transmitted the "desired signal" using a 
fourth antenna located elsewhere on the lot it all worked.

73,
Dave   AB7E



On 7/17/2026 1:15 PM, Jim Brown via Elecraft wrote:
> Exactly right. And I've written extensively about techniques both find 
> and suppress sources. k9yc.com/publish.htm
>
>  But the real world part of the multiplicity of noise sources 
> surrounding us is that only one can be nulled at a time, and in my 
> experience, only on the low bands. An important limiting factor with 
> some sources is that they are physically broad as a function of 
> wavelength! For example, an array of solar panels, with or without 
> inverters, and their wiring.
>
> 73, Jim K9YC
>
> On 7/17/2026 12:58 PM, David Gilbert via Elecraft wrote:
>> Of course that's the ideal solution, and of course lots of people 
>> have done (or tried) exactly that and it often works.  But I doubt 
>> very many people are going to have much luck getting their neighbor 
>> to replace their cheap solar converters with better ones, and I doubt 
>> many people are going to convince the owners of the adjacent condo to 
>> replace their cheap wall warts ... especially since lots of neighbors 
>> aren't all that happy to have hams next door in the first place.
>
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