[RFI] Mystery Noise (Aren't they all)

[Dave (NK7Z)]

Ed,
Here is a funny story about just that...  I was getting set to help a 
friend do some RFI hunting for his area...  We discussed the whole home 
switch throw, and he said he already did it.  Having heard this a number 
of times, and getting burned believing people, I told him I always start 
with a whole home power kill...  He refused, and I told him I was not 
going o RFI hunt until we did a whole home power off...  After three 
days he called and said he had done a whole home power off and his RFI 
ended...  We laughed about it, and I went to his place to find the 
RFI...  It was a touch lamp...

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 1/29/24 16:39, Hare, Ed, W1RFI wrote:
> I agree; with no change, the noise is probably external, but do keep in mind that some UPS devices or devices connected to them may still be powered on, although in that case, I'd expect to see some change.
>
> And no need for an apology.  Tracking down RFI can be darn tricky. If anything, you can be proud of having a mind open enough to backtrack and find what really is a minor misstep. When I worked in the ARRL Lab, many hams with RFI problems would not go back and look again at things they were "sure" they tested right.
>
> You are going to find this.
>
>
> ________________________________
> From: RFI <rfi-bounces+w1rfi=arrl.org at contesting.com> on behalf of Wes Stewart via RFI <rfi at contesting.com>
> Sent: Monday, January 29, 2024 4:55 PM
> To: rfi at contesting.com <rfi at contesting.com>; dave at nk7z.net <dave at nk7z.net>
> Subject: Re: [RFI] Mystery Noise (Aren't they all)
>
> Sadly, no.  A mea culpa and apologies to all who replied.  When I removed power to the shack, of course the KAT500 antenna tuner turned off.  I had put it in bypass mode, however, that wasn't good enough since it defaults to port one and my vertical was on port three.  So effectively, I disconnected the antenna when I removed power.  When I reran the test today with a jumper around the tuner, there is no change in the noise with the house un-powered.
> I am satisfied that the noise is external.
>
> I don't know whether I can make attachments on this site.  If so, I have some screen shots.
>
>      On Monday, January 29, 2024 at 09:10:35 AM MST, Dave (NK7Z) <dave at nk7z.net> wrote:
>
>   Hello,
>
> This indicates that the RFI is in your home.  This is great news, it
> means you can fix it as fast as you want, and you don't have to wait on
> people...  Take a look at:
>
> https://www.nk7z.net/i-have-rfi-now-what-locating-it/
>
> I have a handy flow chart there that may help you locate the RFI...
>
> Please report back on what you find it to be...
>
> 73, and thanks,
> Dave (NK7Z)
> https://www.nk7z.net
> ARRL Volunteer Examiner
> ARRL Technical Specialist, RFI
> ARRL Asst. Director, NW Division, Technical Resources
>
> On 1/28/24 19:50, Wes Stewart via RFI wrote:
>> In conversation with the tech a few days ago I offered to battery power
>> my TS-890 and turn off the whole house breaker.  When I did the noise
>> went from S9+10 dB down to about S4, but it was still there!
>
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