----- Original Message -----
From: "Rick Karlquist" <richard@karlquist.com>
To: "Mark Robinson" <markrob@mindspring.com>
Cc: <richard@karlquist.com>; "Jim Brown" <jim@audiosystemsgroup.com>; "Tower
Talk List" <towertalk@contesting.com>
Sent: Tuesday, 17 February, 2009 7:33 PM
Subject: Re: [TowerTalk] 43' vertical mod for true resonance on 80M
> Mark Robinson wrote:
>> I am planning something like this. What sort of capacitor do you need to
>> use
>> as the series feeding element.......a vacuum capacitor?
>>
>>
>> Mark N1UK
>
> I use WWII surplus "transmitting mica" caps. If you want to make
> the antenna tunable, you can switch in various fixed caps. A vacuum
> variable typically doesn't have enough capacitance, and in any
> event, you don't need the high voltage rating.
>
> Rick
>>>>>>>>>>>>>>>>>>>>>>>>>>>>
So maybe a polyester film capacitor? I imagine that the current is major
issue in the selection of the capacitor here
Mark N1UK
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