HF Doppler RADAR Signal Examination

Discussion in 'Amateur Radio News' started by KA0KA, Feb 4, 2019.

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  1. KA0HCP

    KA0HCP XML Subscriber QRZ Page

    W1YW likes this.
  2. KA0KA

    KA0KA Ham Member QRZ Page

    I just spent 4 hrs of post editing on the next upload -now up, should not take that long but these sweeps were frequency hopping and hard to film. I had 48 mins, 3 videos I edited down to just under 6 mins! It was uploaded this morning! Should have about 8 or so on the RADAR signatures...
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  3. W1YW

    W1YW Ham Member QRZ Page

    There's an important point here that some may miss--

    Tyler is showing you various OTHR radar signatures. I believe almost all the EXAMPLES he shows are legit, and not in the ham bands.

    The point is the HF hams bands are increasingly and ILLEGALLY being invaded by --some--OTHR--almost all exclusively for (non-US) military purposes.

    Tyler's tutorials let you recognize various OTHR waveforms and signatures, which will make it easier for us to find and reveal these ILLEGAL OTHR systems on the ham bands.


    Chip W1YW
    Last edited: Feb 5, 2019
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  4. N1SZ

    N1SZ QRZ Lifetime Member #233 Platinum Subscriber Life Member QRZ Page

    Hi Tyler,

    I believe that this video is mislabeled. You define it as a CODAR (for sensing ocean currents) where its operational characteristics (PRI/PRF) and frequency agility are identical to the U.S. AN/TPS-71 R-OTHR system. CODAR tends not to "hop" around in frequency. A listing of CODAR sites and frequencies can be found here: http://cordc.ucsd.edu/projects/mapping/maps/

    See AN/TPS-71 (towards the bottom of the page) - http://www.signals.taunus.de/TABLES/ALE.HTML

    Other HF radar waveforms and audio can be found here: https://www.sigidwiki.com/wiki/Category:Radar

    Jim, N1SZ
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  5. YV5KG

    YV5KG Ham Member QRZ Page

    Hi Tyler.

    Very nice video of HF dopper, very good to explain to students in the classrooms.
    KA0KA likes this.
  6. N1SZ

    N1SZ QRZ Lifetime Member #233 Platinum Subscriber Life Member QRZ Page


    As a note, the radar that is the subject of your first video is the CMOR - Canadian Meteor Orbit Radar operated by the University of Western Ontario. It uses a 5 receive site phase interferometer for geo-locating meteors. You can learn more about the radar here: http://meteor.uwo.ca/research/radar/cmor_basics.html


    Jim, N1SZ
    Last edited: Feb 5, 2019
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  7. W2MYA

    W2MYA Ham Member QRZ Page

    Chip:Most of us who have been around for some number of years do certainly remember that
    damned "Woodpecker". do you happen to know what physical area of the Soviet Union
    it originated? ( City & Province etc. ) As you remember they denied that anything was going
    on! Even after the band went to bed here in New Jersey it could still be heard fairly strong.
    Thanks for the information. Greg Mitchell W2MYA
    West Caldwell, N.J.
  8. W1YW

    W1YW Ham Member QRZ Page

    Hi Greg,

    The Woodpecker (Duga) was in the Ukraine. It was one of three planned bistatic high powered radars, in which the OTHR aspect was designed to target and correct , in a conjugate fashion, for the propagation factors, essentially tailoring the waveform for a lens-like action at the target. Its true purpose was to act as a high powered artificial electromagnetic pulse weapon that could zap electronics , especially (but not only)on missiles. Although the EMP was artificial and a lot less than the Compton component seen with nuclear weapon EMP, it, in principle was a dangerous asymmetric warfare device.

    The Chernobyl nuclear power plant complex was specifically built to power the Duga TX system. Not to provide power for the towns built to house the Duga personnel. The Duga was about 50 km from the power plants. I could be wrong on the distance--likely closer.

    Aurora f***** the Duga something awful and they did not successfully have the ability to do real-time waveform corrections to deal with it. IOW, the 'lensed' waveform was underpowered in most practical scenarios. I am not aware of any US device shut down by the Duga.


    It was more than 'early warning'... it was 'real-time kill'.

    Basically the 'search' OTHR mode of the Duga is what we heard and what annoyed us. The 'kill' mode---no one talks about it over in that part of the world. Would you?:)

    Some people speculate it was meant to fry brains. That's silly.

    Hope that helps. Its time the truth was more widely known.

    Chip W1YW
    Last edited: Feb 5, 2019
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  9. W1YW

    W1YW Ham Member QRZ Page

    I found this on the web: a view of the Chernobyl power plant from one of the cage antennas on Duga -3.

  10. W8AAZ

    W8AAZ Ham Member QRZ Page

    I used to think those sounders were jerks swishing their VFOs or something till I got one of the new rigs with the spectral display. Then I puzzled out what they were.

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