WHAT ARE ALL THOSE WEIRD NOISES?
A LOOK AT OVER THE HORIZON RADAR
Something a little different today, but still relating to shortwave radio reception!
Over-the-horizon (OTH) radar systems represent a technological leap in long-range surveillance. They enable nations to detect and track aircraft and maritime vessels thousands of kilometres away by exploiting the reflective properties of the ionosphere. However, this capability comes at a significant cost to the global high-frequency (HF) radio community.
Shortwave listeners, amateur radio operators, and even some commercial and scientific users of the HF spectrum have increasingly found their communications disrupted by the characteristic pulsing and sweeping signals emitted by OTH radars. These systems, which transmit powerful, wideband signals across broad swaths of the 3 to 30 MHz range, are known to interfere with legitimate HF operations—often without coordination or consideration of internationally agreed-upon frequency allocations.
https://medxr.blogspot.com/2025/04/w...rd-noises.html
A LOOK AT OVER THE HORIZON RADAR
Something a little different today, but still relating to shortwave radio reception!
Over-the-horizon (OTH) radar systems represent a technological leap in long-range surveillance. They enable nations to detect and track aircraft and maritime vessels thousands of kilometres away by exploiting the reflective properties of the ionosphere. However, this capability comes at a significant cost to the global high-frequency (HF) radio community.
Shortwave listeners, amateur radio operators, and even some commercial and scientific users of the HF spectrum have increasingly found their communications disrupted by the characteristic pulsing and sweeping signals emitted by OTH radars. These systems, which transmit powerful, wideband signals across broad swaths of the 3 to 30 MHz range, are known to interfere with legitimate HF operations—often without coordination or consideration of internationally agreed-upon frequency allocations.
https://medxr.blogspot.com/2025/04/w...rd-noises.html