I remember this thing, had to turn off the rig numerous times as a result and
find something else to do for a while till it went
away.
My question is - what kind of antenna is this?
Yagi, vertical, loop, what??
Bob AD5VJ
-
This gigantic antenna system called Duga-3 is located near Prypiat in the
Chernobyl area. It was built in the 70's as an early
missile detection system (over-the-horizon radar system). It was also called
the Steel Yard hence its distinctive appearance. The
antenna was deactivated in 1989.
The Russian Woodpecker was a notorious Soviet signal that could be heard on the
shortwave radio bands worldwide between July 1976
and December 1989. It sounded like a sharp, repetitive tapping noise, at 10 Hz,
giving rise to the "Woodpecker" name. The random
frequency disrupted legitimate broadcast, amateur radio, and utility
transmissions and resulted in thousands of complaints by many
countries worldwide.
Starting in 1976 a new and powerful radio signal was detected worldwide, and
quickly dubbed the Woodpecker by amateur radio
operators. Transmission power on some woodpecker transmitters was estimated to
be as high as 10 MW EIRP. As well as disrupting
shortwave amateur radio and broadcasting it could sometimes be heard over
telephone circuits due to the strength of the signals.
This led to a thriving industry of "Woodpecker filters" and noise blankers.
http://www.artificialowl.net/2008/12/abandoned-giant-duga-3-system-antenna.html
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