[TenTec] 160 M antenna

[Steve Hunt]

Rick,

I deliberately aimed for a slightly high resonant frequency - from 
memory it was around 2.2MHz. Then I put a small loading coil at the base 
to pull it onto frequency; that coil had a couple of taps on it that 
could be relay switched remotely from the shack to give me stepped 
coverage of the band that I needed. Finally there was a 9:1 broadband 
transformer to bring the impedance up to 50 Ohms.

I don't have the antenna now, but I just noticed the 3 position 
switching is still there built into my shack SWR meter! Left switch here:
http://www.karinya.net/g3txq/swr_meter/front.jpg

Hope that's clear,
Steve G3TXQ




On 09/11/2013 14:17, Rick - DJ0IP / NJ0IP wrote:
> Steve,
>
> The merits of that design are apparent, but how do you tune it?
> Seems it would be awfully difficult to adjust top-hat lengths when they are
> connected together.
>
> Sevick did something like that using a real sun umbrella, but he had it
> split in the middle and inserted a coil.  He could tune by adjusting the
> coil.
>
> 73
> Rick, DJ0IP
>
>