[Elecraft] Noise Nuller

[Mike Fatchett W0MU]

Have you test the app with FT8 or FT4.  I have found that line noise or 
hash will impact receiving.  They say that FT modes can handle the noise 
but I have found that a WNB or NB is required when a particular noise is 
present.

Mike W0MU

On 7/17/2026 5:02 PM, David Gilbert via Elecraft wrote:
>
> 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.
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to ab7echo at gmail.com 
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to w0mu at w0mu.com