I wonder which of the many strong Ukrainian ham signals is using this
array in contests.
Don
N8DE
Quoting Donald Chester <k4kyv@hotmail.com>:
>
>
> 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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