HF Doppler RADAR Signal Examination

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

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  1. KY5U

    KY5U Premium Subscriber QRZ Page

    The OTH reminded me of a ham I knew many years ago that had a QTH radar. At his house on his tower was a radar scanner with the indicator unit in his house. It was the "QTH" radar.
  2. K0UO

    K0UO Platinum Subscriber Platinum Subscriber QRZ Page

    I always appreciate Tyler's videos he puts a lot of work and effort into them and explain thngs so that most hams should be able to understand. Tyler is highly Technical and skilled. The one Navy radar that he was referring to is still being used for surveillance and Central and South America and can be heard regularly on 60 and 40 m
    Thank you
  3. KA0KA

    KA0KA Ham Member QRZ Page

    It is all new to me, I did not even know the name of the signature until Jim N1SZ and Dave K3DCW helped out. They also helped me ID a new video clip I found of the JORN in Australia, it was pounding into Colorado and made a great video. I found a new RADAR again today, it was on 6.4MHz lasted about 15 secs each transmission, sounded like a electric razor in SSB. I was able to video it, sounded Russian but I will have to have Jim and Dave help with ID...Having this state of the art Amateur SDR systems has been a true gift, without it I think I would have finally lost interest in this hobby and moved on to other related things.
    N1SZ likes this.
  4. KA2IRQ

    KA2IRQ Ham Member QRZ Page

    What are some of the factors that go into picking a frequency spectrum for these radars?

    Most hams (like myself) don't understand what goes into the physics of the radar frequency vs. the target they are looking to hit (like ocean waves or missiles) and therefore the choice of frequency spectrum appears haphazard... and when in amateur bands, an intrusion.

    Old OTHR systems, like The Woodpecker, probably were there to disrupt rather than detect, but I'm sure that is not the case for all systems.
  5. KA0KA

    KA0KA Ham Member QRZ Page

    Way too high tech and costly just to 'jam' - they are engineered to the best precision current tech allows, lots of this has to do with finding the target, so frequency, PRI/PRF are big factors. There are a lot of variables that are all trade offs when using this tech, It is all quite fascinating, I think... But to really understand this, one would have to have prob worked in it as a career for a few decades, most of us did not have those type of paths...well I did not.
    Jim N1SZ and Dave K3DCW know more about this then anyone I have found...
    N1SZ and W1YW like this.
  6. KA0KA

    KA0KA Ham Member QRZ Page

    Just posted the JORN video, really great sample all the way from Australia!!! Thanks to K3DCW & N1SZ as well for their help!!!

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