I have the zero five 55 foot antenna which was custom built to actually be a full sized 80 meter antenna. It was affordable and has stood up well on a very windy mountain top. Performance is, of course, no different than a 65 foot wire…. if you had trees to support the latter.
On Jun 3, 2014, at 1:43 AM, Ray Benny <[email protected]> wrote: > Mike, > > Can you find or provide more info on these 80m zero-five verticals? What > does zero-five mean or stand for? > > I though about using relays to switch in/out the top loading wires for > 160m, but computed the voltage to be over 10 KV. Vacuum relays to handle > that voltage are very expensive. Then there is the issue of protecting them > from harsh WX. > > Ray, > N6VR > > > On Mon, Jun 2, 2014 at 9:39 PM, Jim Brown <[email protected]> wrote: > >> On 6/2/2014 6:07 PM, John Kaufmann wrote: >> >>> Perhaps top loading would be somewhat more efficient on 160, >>> but it would be difficult electrically and mechanically to switch out top >>> loading on 80. >>> >> >> Not as difficult as you might think. Certainly worth some modeling. Add a >> 80M trap at the top between the vertical and horizontal portions. Below 80M >> that circuit would look inductive, which adds loading on 160. In the model, >> play with values for the trap and the top wires to maximize efficiency. My >> guess it that might be good for another dB or two. >> >> >> 73, Jim K9YC >> _________________ >> Topband Reflector Archives - http://www.contesting.com/_topband >> > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > _________________ Topband Reflector Archives - http://www.contesting.com/_topband
