I once had a shunt fed 60 foot tower that was super effective for transmitting
on 160m, even with little or no radials... Used a variable capacitor in a box
for the "gamma rod."
Best regards - Brian Carling
AF4K Crystals Co.
117 Sterling Pine St.
Sanford, FL 32773
Tel: +USA 321-262-5471
Best regards - Brian Carling
AF4K Crystals Co.
117 Sterling Pine St.
Sanford, FL 32773
Tel: +USA 321-262-5471
> On Mar 24, 2015, at 2:25 PM, "tedc@nucleus.com" <tedc@nucleus.com> wrote:
>
>
> Jim,
>
> Looking at the spacing on the 500 pfd. cap in the
> SA2550 it should be plenty robust for most current
> fed systems; however the breakdown voltage may not be
> high enough for a voltage fed high Z system. My 102
> degree system is current fed and I plsn to use
> variables rated at 5 to 6 Kv. in any case.
>
> Ted VE6AMR
>
>
> ------- Original Message -------
> From : Jim Brown[mailto:jim@audiosystemsgroup.com]
> Sent : 3/24/2015 12:09:24 PM
> To : towertalk@contesting.com
> Cc :
> Subject : RE: Re: [TowerTalk] A Capacitively Fed 102
> Degree Vertical for 160Meters
>
>> On Mon,3/23/2015 8:03 PM, Doug Smith wrote:
>> I use an inverted L for 160 with an old Heathkit
> SA2550 at the base of the
>> vertical element. The 2550 is an electrically
> driven large variable
>> capacitor, remotely tuned/turned from the shack.
>
> I had one of those in my shack for a while -- it came
> from the estate of
> a silent key, and I was helping his XYL sell his
> stuff. It looked quite
> robust, so I thought I'd like it. Turned out that it
> started arcing with
> high power on antenna that my Ten Tec 238 had no
> problems with, so I
> sold it for her rather than buying it myself.
>
> 73, Jim K9YC
> _______________________________________________
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