Topband: Using 80m 1/4 vertical on 160

[Ray Benny]

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 <jim at audiosystemsgroup.com> 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
>