Sunday, 31 May 2009
Rybakov 806 Multiband Antenna
The Rybakov 806 Multiband Antenna is a little different to other antennas I have made in that it is designed to not be resonant on any of the amateur bands. What makes it special is that because it is a non-resonant antenna it tunes up equally as well (or as badly) on the WARC bands as on 7/14 and 28Mhz with only 7.6m of wire. Some have found that with a longer wire, in the region of 8.6 to 21m that they can use the antenna on 3.5mHz.
I became interested in this antenna when Peter ON3WAB mentioned that he and Lieven ON4CVL were using one, made by Lieven, on a SOTA activation from Hotondberg ON-022 using an Icom 703 and 10w and putting out a fabulous signal. It seemed ideal for those summits where you cannot get a dipole up and a number of constructors have claimed it out performs trapped verticals. Pictures from the ON activation - http://www.flickr.com/photos/9924647@N08/
The only thing I did not have to make one of these was the T-200-2 Toroid which I found on eBay for under £4 from Spratreader (email@example.com) who is actually Les Jackson G4HZJ a member of West Manchester Radio Club.