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Re: [RFI] Further data on my weird RFI problem

To: N4ZR <n4zr@comcast.net>, RFI List <rfi@contesting.com>
Subject: Re: [RFI] Further data on my weird RFI problem
From: K9MA <k9ma@sdellington.us>
Date: Fri, 7 May 2021 11:30:53 -0500
List-post: <mailto:rfi@contesting.com>
OK, that probably rules out switching power suppies and there kin.

73,
Scott K9MA


On 5/6/2021 8:53 PM, N4ZR wrote:

Hi Scott - I should have mentioned that.  As far as I can tell, each of the frequencies is very stable.  When I finally find it, this is going to be a weird one!

73, Pete N4ZR
Check out the new Reverse Beacon Network
web server at<http://beta.reversebeacon.net>.
For spots, please use your favorite
"retail" DX cluster.
On 5/6/2021 5:24 PM, K9MA wrote:
Hi Pete,

Is the frequency stable, or does it drift around?

73,
Scott K9MA

----------

Scott Ellington

  --- via iPad

On May 6, 2021, at 9:11 AM, N4ZR<n4zr@comcast.net>  wrote:

While I wait for the preamp needed to use my WD8DSB portable flag to pin it 
down, I thought RFI readers might be interested in some more data.

The signal is present every 50 KHz from approximately 5000 KHz to about 7800 KHz, 
strongest at around 6450 KHz.  On each of these frequencies it consists of a relatively 
strong central signal and multiple symmetrical "sidebands" spaced 60 Hz apart.  
At the strongest frequency, it is clear that the every-120-Hz sidebands are stronger than 
those at 60-Hz intervals, and that their strength tapers fairly rapidly as you tune 
further from the center

The other thing I have discovered is that it is quite local.  No DF capability 
yet on HF, but If I go a mile or so away from my QTH, it is not audible on a 
decent portable SW receiver.  Tried yesterday to quasi-DF it, walking the 
neighborhood using signal strength, but with inconclusive results. It begins 
every morning at 0900:02 local time, and continues well after sunset, both of 
which tend to suggest it is on some sort of timer.

Do these rather unusual characteristics suggest what kind of an emitter I might 
be looking for, or must I just wait for the DF hardware?

--
73, Pete N4ZR
Check out the new Reverse Beacon Network
web server at<http://beta.reversebeacon.net>.
For spots, please use your favorite
"retail" DX cluster.

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--
Scott  K9MA

k9ma@sdellington.us

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