[RFI] Further data on my weird RFI problem

[N4ZR]

Yes, I have been watching at startup, using HDSDR, and I can tell you 
that the waterfall lines for each of the signals are absolutely straight 
from the first second.  I'd say drift is less than 10 Hz.

I'm getting the W7IUV preamp kit instead of the DX Engineering unit, 
mainly because of cost (a usual problem with DXE, unfortunately). I 
figure an hour of my time...

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 10:50 PM, Alan Higbie wrote:
> Have you been watching when it actually first starts up?
> - I would guess there is some drifting occurring before the frequency 
> stabilizes.
> - But, the most important thing to know at this point is where it is 
> located.
> - The WD8DSB portable flag + DXE preamp/attenuator + SDR is an awesome 
> set of RFI tools!
> - You’ve got this.
> - My guess: grow lights.
>
> 73,
> ~ Alan K0AV
>
> On Thu, May 6, 2021 at 7:54 PM N4ZR <n4zr at comcast.net 
> <mailto:n4zr at comcast.net>> 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
>     <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 at comcast.net
>     <mailto:n4zr at 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
>     <http://beta.reversebeacon.net>>.
>     >> For spots, please use your favorite
>     >> "retail" DX cluster.
>     >>
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