Within the past year or two, we had reports of a steady 40-meter carrier on
our region-wide GMCC reflector. It was down in the CW band.
Various stations chimed in with their beam headings and other theories of
how to go about locating the source.
In retrospect, it seems like the best way to locate the source would be the
following steps:
(1) Determine where the signal can be heard during the daytime
(2) Get beam headings from various locations (at any time of day)
(3) But, discount beam headings from close-in during periods of NVIS
propagation
(4) Check for where the signal is strongest - while noting QSB patterns
(5) Drive around with a mobile receiver while watching for increased signal
strength - and try to get to a place where there is no variation in signal
strength.
(6) Then, DF from there.
In the previous case, *one of the earliest and the most accurate beam
heading came from N2IC (who used a 4 el., 40-meter beam from about 500
miles away)*.
That earlier case turned out to be a 100-watt remote amateur station stuck
on transmit. It was deep in a narrow mountain valley just north of Alma,
Colorado. I'm not sure, but I think the FCC eventually located it.
Ironically, I drove right past it Colo. Highway 9 (within line of sight)
that station maybe 5 to 10 times while everyone was searching. I just
didn't have my 40-meter receiver with me - and turned on. I even have a DF
loop I could have used.
73,
~ Alan K0AV
On Mon, Jan 30, 2023 at 4:06 PM Don Moman VE6JY <ve6jy.1@gmail.com> wrote:
> the source is likely from North America (or any other country that uses 60
> hz power) as the carrier has 120 hz power supply sidebands...
>
> On Mon, Jan 30, 2023 at 3:59 PM Michael Carter <Mike.Carter@unh.edu>
> wrote:
>
> > If my reading of that table from the source
> > Joe linked is correct, the China transmitter
> > on 7.195 MHz has a TX power of 50 watts.
> > Seems unlikely to provide S9 + 10 dB signal
> > or larger in west central US......
> >
> > Mike, K8CN
> > ________________________________
> > From: RFI <rfi-bounces+mike.carter=unh.edu@contesting.com> on behalf of
> > David Eckhardt <davearea51a@gmail.com>
> > Sent: Monday, January 30, 2023 5:52 PM
> > To: Joe <nss@mwt.net>
> > Cc: rfi@contesting.com <rfi@contesting.com>
> > Subject: Re: [RFI] CARRIER ON 40-METERS
> >
> > CAUTION: This email originated from outside of the University System. Do
> > not click links or open attachments unless you recognize the sender and
> > know the content is safe.
> >
> >
> > I would rule out either of these two sources. It is strong with slow
> > ionospheric fading indicating only one skip zone. Certainly not
> > characteristic of Chinese or German signals in the middle of the
> afternoon
> > on 40-Meters.
> >
> > Dave - WØLEV
> >
> > On Mon, Jan 30, 2023 at 10:42 PM Joe <nss@mwt.net> wrote:
> >
> > > According to these folk it's Germany or China.
> > >
> > >
> >
> https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.freqspotter.com%2Fsearch.php%3Fsearch_for%3Dguide%26q%3D3%26order_by%3Dcallsign%26page%3D45%26order_direction%3DASC&data=05%7C01%7Cmike.carter%40unh.edu%7C26a8ef3f122e41c3051a08db0314c5e6%7Cd6241893512d46dc8d2bbe47e25f5666%7C0%7C0%7C638107159972664361%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=mxIzPgYi3nT84MZeuzbbeK3zX3BKeJujf%2Fs8blpDi28%3D&reserved=0
> > >
> > > Joe WB9SBD
> > >
> > > On 1/30/2023 4:36 PM, Wes Stewart via RFI wrote:
> > > > Using my Perseus it's peaking -70 dBm on my 40-meter inverted-vee
> > with
> > > 30 dB fades here in Tucson at 2225Z.
> > > > I have no idea what it is.
> > > >
> > > > Wes N7WS
> > > >
> > > > On Monday, January 30, 2023 at 03:06:28 PM MST, David Eckhardt<
> > > davearea51a@gmail.com> wrote:
> > > >
> > > > Strong here in N. Colorado. 7.195 MHz. It is being heard at least
> > > from E.
> > > > Texas to Kansas and, of course, here in N. Colorado. It is a clean
> > > > unmodulated carrier and has been present for 3 to 4 days. I've heard
> > it
> > > > typically during daytime hours, but not tried during the evening.
> > > >
> > > > Does anyone have information on what it may be?
> > > >
> > > > Dave - WØLEV
> > > >
> > > _______________________________________________
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> > >
> >
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> > >
> >
> >
> > --
> > *Dave - WØLEV*
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