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Author Topic: UNID 12185 kHz 25kHz wideband transmission  (Read 2531 times)

Offline GC

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UNID 12185 kHz 25kHz wideband transmission
« on: July 14, 2018, 1614 UTC »
I have been stumbling across some wideband transmissions for a while which are quite strong in Eastern Ontario

Just a while ago, 12185kHz was active, went off the air 2018-07-14 15:45 UTC

About 25kHz from edge to edge
Reminds of some of the OTHR like 29B6 Kontayner OTH Radar: https://www.sigidwiki.com/wiki/29B6_%27Kontayner%27_OTH_Radar  but doesn' quite look the same on the waterfall but then again I am not that familiar with identifying this particular signal.

I attempted to use the KiwiSDR TDoA capability and my feeble attempt seems to indicate a location somewhere in middle USA, coincidentally near lower Lake Michigan and the suspected location of the UNID 1 PPS pip/tick/time signal.

screen grabs here:


I have not yet mastered the fine art of linked images to postings on hfunderground so for now I will only provide a link to a folder on dropbox, file names should be intuitive enough.

cheers, Graham near Ottawa Canada

« Last Edit: July 14, 2018, 1635 UTC by GrahamC »

Offline GC

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Re: UNID 12185 kHz 25kHz wideband transmission
« Reply #1 on: July 14, 2018, 1636 UTC »
similar signal now active on 14880 kHz

KiwiSDR TDoA puts it right around Chicago

cheers, Graham near ottawa Canada

Offline PresentedIn4D

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Re: UNID 12185 kHz 25kHz wideband transmission
« Reply #2 on: July 15, 2018, 0556 UTC »
I believe it's the same signal I posted here recently: https://www.hfunderground.com/board/index.php/topic,43974.0.html
I had a feeling it was related to the weird pip...
Syracuse, NY // FN13ua
40m Doublet + WiNRADIO Excalibur / Kenwood TS-2000
qsl @ presentedin4d at gmail . com

Offline Token

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Re: UNID 12185 kHz 25kHz wideband transmission
« Reply #3 on: July 15, 2018, 1332 UTC »
This wideband data has been around for a while, but has become more common in the last 9 months.  There are several Experimental Licenses that match the approximate modes and frequencies normally seen.


Note that a few of these are ones people have tried to tie to the Time Tick Pips (TTPs).

None of these licenses cover the modes or frequencies displayed by the TTPs.  I have said a few times I doubt that the TTPs and the High Frequency Trader (HFT) tests are related, and I think this might be a further indication.  There is some indication this wideband data might indeed be the HFT testing, at least it is believable it might be related.  Generally we don't see the TTPs in the same frequencies we see the wideband data.  If the TTPs were related, and were the results of the experimental trying to define propagation or discover any little advantage to propagation, why don't they also do that on freqs they are known to use?

Just my take on it. 

Mojave Desert, California USA


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