[RFI] Does anyone recognize this RFI?

[K9MA]

I may have misinterpreted the frequency scale, as I thought it was RF. 
It appears it is audio, Hz, not kHz, in which case I agree, it doesn't 
look like a switcher, but something modulated at 55 Hz.

73,
Scott K9MA

On 4/15/2020 13:03, Hare, Ed W1RFI wrote:
> Most of those switchers do drift with temperature. They also show 
> little jumps in frequency with voltage changes, so that, too, can be 
> diagnostic.
>
> The real question is not usually the one hams always ask: What is it?
>
> You need to know where it is, and it is easy from there to narrow it down.
>
> ------------------------------------------------------------------------
> *From:* RFI <rfi-bounces+w1rfi=arrl.org at contesting.com> on behalf of 
> K9MA <k9ma at sdellington.us>
> *Sent:* Wednesday, April 15, 2020 12:48 PM
> *To:* rfi at contesting.com <rfi at contesting.com>
> *Subject:* Re: [RFI] Does anyone recognize this RFI?
> Looks like a switching power supply running at 55 kHz. If you zoom in on
> one of the spikes, you'll probably see an asymmetrical spectrum, with a
> longer tail on one side. And it will probably be drifting around a lot.
>
> 73,
>
> Scott K9MA
>
> On 4/15/2020 11:02, Eddie Edwards wrote:
> > Without seeing the motion, hard to tell what it's really doing.  
> Anything with a free-running oscillator might cause that.  Those old 
> touch controlled lamps use to make multiple drifting spikes like that 
> and lots of noise as well with clumps of noise every so many KHz.
> >
> > Only way to know for sure what kind of device is to DF or track it down.
> >
> > 73, de ed -K0iL
> >
> > -----Original Message-----
> > From: RFI <rfi-bounces+eddieedwards=centurylink.net at contesting.com> 
> On Behalf Of Matt Foster
> >
> > The linked image shows interference that, as far as I know, is 
> always present for me on 15m. I’m talking primarily about what is 
> appearing between about 1400 and 2100 on the waterfall. If you look 
> closely, you’ll see that the lines are leaning slightly to the right. 
> They VERY slowly progress up in frequency and then back down in 
> frequency. It appears to me that there is a spike about every 55 Hz. I 
> have no idea what this might be.
> > I thought someone on here might recognize it.
> >
> > 
> https://drive.google.com/file/d/1FthSrYNX1ogF9IGJAYA_TeeHWFF7qrch/view?usp=sharing
> >
> > Thanks and 73,
> > Matt, N0EYE
> > _______________________________________________
> > RFI mailing list
> > RFI at contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
> >
> > _______________________________________________
> > RFI mailing list
> > RFI at contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
>
>
> -- 
> Scott  K9MA
>
> k9ma at sdellington.us
>
> _______________________________________________
> RFI mailing list
> RFI at contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi


-- 
Scott  K9MA

k9ma at sdellington.us