OTH and Ionospheric Bounce QRM

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    Layne AE1N
    Layne AE1N
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    We saw the demise of the “Russian Woodpecker” over-the-horizon (OTH) radar after the disaster at Chernobyl. Now there is a possibility of more QRM with the advent of modern sophisticated OTH radar systems being tested and built. While understanding the need for defense reasons, countries are not concerned about interference to radio hams.

    • Australia is developing OTH radar for ocean surveillance by Bradley Perrett, Melbourne. (Condensed from Aviation Week & Space Technology, May 23, 2016.
    • Australia is developing a specialist over-the-horizon (OTH) sky-wave radar as a means of detecting targets perhaps 1,900 miles away. Australia already has probably the world’s most advanced OTH radars, three installations in the Outback that form the Jindalee network. They work best in aircraft but also ship detection.
    • Improved mode-selective OTH radars would strengthen Australia’s contribution to the U.S. ocean surveillance picture.

    China also uses OTH radars, apparently of conventional design. If Jindalee can detect a 187-foot patrol boat, a 1,000 foot carrier should show up on Chinese screens rather nicely.

    Layne AE1N

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