We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

Author Topic: UNID 6965 (CF) 2200 UTC 09 DEC 2021  (Read 1815 times)

Offline ~SIGINT~

  • DXing Phenomena
  • *******
  • Posts: 4269
  • N.E. Canada (FN08)
  • .ılılı..ılılı..ılılı..ılılı..ılılı..ılılı.
    • View Profile
    • Milspec Communication Canada
UNID 6965 (CF) 2200 UTC 09 DEC 2021
« on: December 09, 2021, 2207 UTC »
UNID 6965.0 kHz (Centre Frequency) 22:00 UTC 09 DECEMBER 2021

Note: Unconfirmed. It has been suggested that this is part of the high-frequency trading (HFT) HF network experiment.

22:00 UTC - UNID UTE with 10 kHz wide signal with unknown data format. Appears to be 4 distinct channels. 2 x on the lower side of centre frequency and 2 x on the upper side of centre frequency;
22:10 UTC - Signal is starting to fade to my location;
22:12 UTC - Weak and unreadable;
22:16 UTC - Signal is now good and readable;
22:20 UTC - Signal is now +15;
22:50 UTC - Weak and unreadable;
23:08 UTC - Signal level is returning at S8;
23:26 UTC - Signal suddenly went off the air and changed frequency to 6947.0 kHz CF;
23:48 UTC - Lost signal on 6947.0 kHz CF;
23:51 UTC - Reappeared on 6960.0 kHz CF. This appears to be paired with an accompanying adjacent frequency 23 kHz higher;
23:55 UTC - Signal lost on 6960.0 kHz.



Audio recording:
http://www.milspec.ca/board/media/SDRuno_20211209_170349_6965000HZ.mp3


RSPduo | Barker & Williamson antenna | Toronto, Ontario Canada
« Last Edit: December 10, 2021, 2210 UTC by ~SIGINT~ »

Offline ~SIGINT~

  • DXing Phenomena
  • *******
  • Posts: 4269
  • N.E. Canada (FN08)
  • .ılılı..ılılı..ılılı..ılılı..ılılı..ılılı.
    • View Profile
    • Milspec Communication Canada
Re: UNID 6965 (CF) 2200 UTC 09 DEC 2021
« Reply #1 on: December 10, 2021, 2209 UTC »
UNID 6960.0 kHz (Centre Frequency) 21:48 UTC 10 DECEMBER 2021

21:48 UTC 10 Dec 2021 - Signal is once again very predominant on 6960.0 kHz today at an S9 level;
21:50 UTC - Off air for approx 15 seconds and returned;
21:51 UTC - Off air for approx 15 seconds and returned;
21:53 UTC - Off air for approx 15 seconds and returned; on / off pattern continues to repeat;
22:00 UTC - Transmission is now continuous;
22:33 UTC - Off air.


RSPduo | Barker & Williamson antenna | Toronto, Ontario Canada
« Last Edit: December 10, 2021, 2234 UTC by ~SIGINT~ »

Offline Ct Yankee

  • Marconi Class DXer
  • ********
  • Posts: 7064
  • Two of the four food groups in Durham, CT
    • View Profile
    • Email
Re: UNID 6965 (CF) 2200 UTC 09 DEC 2021
« Reply #2 on: December 10, 2021, 2213 UTC »

I received it from 2145 utc to the moment on 6965, I was wondering if THE BEGINNING was tuning up for a broadcast.
« Last Edit: December 10, 2021, 2218 UTC by Ct Yankee »
Tecsun H501x (broadcast received on this unless noted), Zenith T/O G500, Zenith T/O Royal 7000, Emerson AR-176, Zenith 8S154, T/O 7G605 (Bomber), Tecsun PL-600, Tecsun PL-880, Zenith 5S320, Realistic DX 160 using 40 feet of copper wire.  With apologies to Senator Gramm for his thoughts on firearms, "I have more radios than I need but not as many as I want."
QTH:  Durham, Connecticut (rural setting, 15 miles north of Long Island Sound)
qsl please to:  jamcanner@comcast.net  (Thank you)

Offline ~SIGINT~

  • DXing Phenomena
  • *******
  • Posts: 4269
  • N.E. Canada (FN08)
  • .ılılı..ılılı..ılılı..ılılı..ılılı..ılılı.
    • View Profile
    • Milspec Communication Canada
Re: UNID 6965 (CF) 2200 UTC 09 DEC 2021
« Reply #3 on: December 10, 2021, 2229 UTC »
Kind of puts the kabash on pirates operating on that part of the band. That is 30 kHz of valuable spectrum for what if you ask me, a crazy idea. Does anyone really believe that high-frequency trading (HFT) over an HF network has less latency than a solid fibre network connection? They are talking microseconds. Seriously.

Ball Smacker certainly will not be able to return to 6960 any time soon with this power house.
« Last Edit: December 10, 2021, 2232 UTC by ~SIGINT~ »

Offline Token

  • Global Moderator
  • DX Legend
  • *****
  • Posts: 2122
    • View Profile
Re: UNID 6965 (CF) 2200 UTC 09 DEC 2021
« Reply #4 on: December 11, 2021, 1549 UTC »
Kind of puts the kabash on pirates operating on that part of the band. That is 30 kHz of valuable spectrum for what if you ask me, a crazy idea. Does anyone really believe that high-frequency trading (HFT) over an HF network has less latency than a solid fibre network connection? They are talking microseconds. Seriously.

Yes, absolutely HFT over HF will have less latency than a fiber connection.  HFT potentially leverages nanoseconds of difference in time, and the difference between fiber and radio can be much more than microseconds, it can be milliseconds.  If you ever look at the way HFT works you will find that they use automated software and short duration variations in stock value to "buy low and sell high".  Even a stock that over minutes of time is down, will have short periods when it is up, just a little bit.  They may buy 10 million dollars of a stock at say 6.29378, and 50 microseconds later the value is 6.30052, so they sell.  In that 50 microseconds they made $10,709, even if the total value of the stock is down drastically, say 6.27, 2 seconds later.  The guy who can see, and respond, to that short duration rise first is the guy who can make the most money off it.  Microseconds count.

On average, light in fiber travels about 31% slower than radio waves do, or, if you prefer, the Vp of average fiber is about 0.69 c.  Specifically designed high speed fiber will be faster, maybe up to 0.84 c.  But that is still slower than radio.

Not counting overhead latency, a 1500 km path over high speed fiber will take about 6 milliseconds, and over more average fiber it will take about 7 milliseconds.  Over radio this same propagation delay will be about 5 milliseconds.  Radio links will be 15%, or more, faster.  Now push that to coast-to-coast or transoceanic distances.
 When microseconds count, radio can be multiple milliseconds faster.

In the case of this signal, if you look at Part 5 experimental license WI2XNX and WJ2XXI you will find a close match for the frequencies used.  And the FSK emission description might fit also.  The 4-QAM description might fit other possible HFT signals we see on the bands.  https://fcc.report/company/10Band-LLC

Yes, the signal we are seeing in this case probably cannot be used for actual trading purposes.  Although there are several versions of the signal, and the speeds change, the data in it does not appears to change for long periods of time.  But maybe they are using it for experimental purposes, to build information or experience they need for something else.

This is what it looks like right now (1622z) here:


T!
« Last Edit: December 11, 2021, 1628 UTC by Token »
T!
Mojave Desert, California USA

 

HFUnderground T-Shirt
HFUnderground Garden Flag
by MitchellTimeDesigns