China's HF "Dragon" over-the-horizon backscatter (OTH-B) radar may be getting more troublesome for other radio services as that country continues to modernize and build out its military capability. This radar system transmits complex tone bursts spread out over several kilohertz. It has caused an enormous problem for Asian weak signal CW operations in the 40 meter amateur band, though I've never heard it here.
Developing...
