Hi Don,
Thanks for responding.
I am using a 14 inch loop I built from your plans many years ago. I think this
loop is for lower frequencies though. I used it with success finding noises on
160 meters. I've never tracked down noise on higher HF frequencies.
I went outside again today and turned the K3 preamp on and I can now hear the
signal but its pretty weak. However, I can hear all kinds of CW and FT8
signals with no problem ?
I will take another drive through the neighborhood and see if I can locate the
signal now that I can hear it.
Joe
N3HEE
> On 09/09/2021 11:24 AM Don Kirk <wd8dsb@gmail.com> wrote:
>
>
> Hi Joe,
>
> You said you have driven around the neighborhood with DF gear but with no
> luck. The real question is if you can hear this when you step outside your
> house with DF gear (don't jump in a car driving around, first get your DF
> gear working so you can hear the signal when standing outside your house).
> That signal you show is so strong (10 to 20 dB over your noise floor) that
> you should easily hear it with a small DF loop outside your house as long as
> you have enough preamp gain. If you can't hear it then you need more preamp
> gain or the signal likely originates in your house.
>
> K0AV suggested using the portable flag, and that would make finding this
> kind of signal a no brainer based on my experience, but a small (12 to 14
> inch diameter) shielded untuned loop made with a hunk of coax would still
> work wonders as long as you use a preamp (you probably will only need 10 or
> 20 dB of preamp gain but that's easy to achieve). The key is to have enough
> gain so you can hear the signal from right outside your house if at all
> possible before you start walking or driving around. I would love having a
> RFI signal like your currently experiencing to find as it's very distinctive.
>
> 73,
> Don (wd8dsb)
>
> On Thu, Sep 9, 2021 at 7:55 AM Joe Galicic < galicic@comcast.net
> mailto:galicic@comcast.net > wrote:
>
> > > > Greetings All,
> > >
> > > Here is something for all of you RFI sleuths to have some fun
> > with. An interesting "signal" has appeared in the last couple of weeks at
> > my QTH.
> > >
> > > Clues:
> > >
> > > I've eliminated my house.
> > >
> > > I've driven around the neighborhood with direction finding
> > gear (K3 with small magnetic loop antenna) with no luck so far.
> > >
> > > A local ham 5 miles away can't hear it.
> > >
> > > The "signal" is there 24/7.
> > >
> > > It is also on 40 meters.
> > >
> > > Any ideas what this could be ?
> > > See video here https://youtu.be/sl050wudAm0
> > >
> > > Joe
> > > N3HEE
> > >
> > _______________________________________________
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> > RFI@contesting.com mailto:RFI@contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
> >
> > >
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