My shunt-fed tower requires an Omega match in order to get a good
feedpoint SWR. My current Omega match has 3000-volt air variables in
both positions. I understand the calculation for the voltage across a
single series capacitor, but not how to calculate it for this matching
system. I have never run over 200 watts to this antenna, and am
wondering what will happen with QRO. Can someone explain the calculation?
73, Pete N4ZR
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Pete Smith
On 7/23/2009 3:44 PM, Mike wrote:
> Great discussion, is there a good source of vacuum variables (at reasonable
> prices)
> for this application. Everything I've found has been in the $300+ dollar
> range?
>
>
>
> ________________________________
> From: DAVID CUTHBERT<telegrapher9@gmail.com>
> To: Roy<royanjoy@ncn.net>
> Cc: topband@contesting.com
> Sent: Wednesday, July 22, 2009 4:38:43 AM
> Subject: Re: Topband: T - vertical improvement
>
> The radial system you have will be fine. What you give up is matching
> simplicity. The T will need a base series capacitor as a minimum and an
> L-network if you like a 1:1 VSWR. At 1.5 kW the 370 pF cap will see 10 kV
> RMS. You are looking at a vacuum variable capacitor.
>
>
> Dave WX7G
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>
>
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