Wednesday, December 17, 2014


This is coolbert:

From that previous blog entry:

"NOT in forty years or so has this sort of thing occurred."

NO! Over-the-horizon [OTH] radars more common and active than what I had thought. STEEL YARD did not and does not exist in a vacuum. NOT one of a kind.

China, Iran, United States, now Canada and perhaps even Australia possess such radar systems.

AND causing havoc in some instances to listeners in the high frequency bands.

From an amateur radio forum, thanks to aa7ae:

1. "HF bands being invaded by the Chinese Dragon"

"Lately I've started to notice the 30 meter band is being completely trashed by this mysterious pulses noise extending over a wide portion of the band when trying to receive WSPR signals. In doing some research on the net, I've located several references to this as the 'Chinese Dragon', a form of over the horizon [OTH] radar. Several people have also reported the same thing on a wide portion of the 40 meter band as well. Here are some links to a few youtube videos documenting this unfortunate nasty signal. Maybe gone are the cold-war days of the infamous Russian Woodpecker, but now we have to contend with this new problem. But if any of you come across this and are wondering what it is, this may help explain it. I was going to attach my own WAV file and WSPR screenshot, but this board does not seem to allow such files to be attached.

2. "OTH Radar from Iran on 10 m"

Thanks to  DK2OM.
"The Over The Horizon (OTH) Radar from Iran is daily transmitting on our 10 m-band, often long lasting on 28245 kHz. You can hear a high and a low tone, corresponding to the sweep rates of 870 and 307 sweeps/sec. The system is  about 60 kHz wide, the splatters are covering +/- 250 kHz."

Note in all instances these OTH up and active for some time now. NOT just yesterday!


No comments: