[RFI] 40 Meter OTH Radar?

David Cole dave at nk7z.net
Sun Dec 13 23:20:00 EST 2015

I am pretty sure this is Chinese OTHR.  It's very much like a mini
version of the old Woodpecker, only it covers part of a ham band, not
the entire ham band like the old Duga 2, (Steel Yard), facility did...  
Thanks and 73's,
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On Sun, 2015-12-13 at 21:41 -0500, Karin Johnson wrote:
> I'm trying to track down several sources of RFI at my location.
> I'd like to indulge the multitude, if they have heard what appears
> to be a pulsed buzz sounding signal in AM mode on the bottom end of 40
> meters.
> It doesn't particularly have a long term specific frequency as it shows
> up on a different frequency each night here.  But it is somewhat stable
> over an hour or so period.  If someone in the southeastern US would listen
> after 0000 Zulu and tell me if they hear anything that might resemble this
> signal.  It has a pulse rep rate of about 2 per second.  This could be local
> to
> me but the signal has some deep fades like propagation might be attached to
> it, which why I'm asking for some help.  I do have some DF equipment ordered
> and on the way but it is not arriving for a couple of weeks.  In the mean
> time
> this signal shows up each and every night here.  Tonight (12/13) it is
> centered
> at 7039 khz and is about 10 kHz wide.  I've heard it as low as 6900 kHz and
> as high as 7080 kHz.  
> Thanks,
> Karin K3UU
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