Bob, I must have misunderstood your question. The elements are cage
constructed dipoles, fed in the center and with an unusual support/mount
structure. I believe the conducting support acts like a folded dipole in
parallel with the conventional dipole. I got a translated version of
Ayzenvberg's antenna handbook off the internet, and it has a description for
these dipoles including impedance bandwidth measure. -Jim w3cp
----- Original Message -----
From: "AD5VJ Bob" <rtnmi@sbcglobal.net>
To: <towertalk@contesting.com>
Sent: Thursday, December 18, 2008 11:28 PM
Subject: [TowerTalk] Some spectacular views of the abandoned
RussianWoodpecker antenna array
> 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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