[Elecraft] Noise Nuller

[Mike Fatchett W0MU]

Make sure your UPS units are turned off when you go battery.  I have a 
noise that is pretty much over EU and I am nearly certain now that it is 
in the shack and fairly certain it would be a ups. I don't want to tear 
stuff apart during 6m ES season.

On 7/17/2026 11:33 AM, Bob McGraw via Elecraft wrote:
> Has anyone given thoughts or efforts to finding and addressing the 
> source of the noise?   All of these electronic concepts are great, but 
> would not finding, reducing or eliminating the source be more 
> effective.   I seem to think so from my personal experience of 
> tracking down noise and resolving same.
>
> Start with the radio on a battery as the power source.  Then drop the 
> mains power.   Note the noise level.  Then restore mains power and 
> observe the noise.  That my friends is coming from your house. This 
> should be easy to find and correct.   Power distribution systems noise 
> are more challenging to find and correct.  But with a bit of 
> cooperation from the power company that can be accomplished as well.
>
> From my experience and work, my noise level on most all bands, 160M - 
> 6M,  is S-2 to S-3, excluding atmospheric noise of distant lightning.  
>  Winter will correct that.
>
> 73
>
> Bob, K4TAX
>
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