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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