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Re: [TowerTalk] Capacitors To Tune 160 Vertical

To: Bill Turner <dezrat@copper.net>, <towertalk@contesting.com>
Subject: Re: [TowerTalk] Capacitors To Tune 160 Vertical
From: Jim Lux <jimlux@earthlink.net>
Date: Thu, 29 Nov 2007 09:05:19 -0800
List-post: <mailto:towertalk@contesting.com>
But for any frequency where the impedance of the C is much less than the 
leakage, it will be the tolerance of the C value that determijnes the split. 
Since most caps are no worse than 20%, that's probably your max variation.

Take a concrete example. Say we're seriesing 1000pF caps. At 1.8 MHz the Z is 
1/(1E-9*1.8E6*2pi)
That's about 1/12E-3 or about 80 ohms... Orders of magnitude less than the 
leakage R.

Jim Lux

-----Original Message-----
From: "Bill Turner" <dezrat@copper.net>
To: towertalk@contesting.com
Sent: 11/29/07 08:40 AM
Subject: Re: [TowerTalk] Capacitors To Tune 160 Vertical

ORIGINAL MESSAGE:

On Wed, 28 Nov 2007 11:38:30 -0800 (PST), "Rick Karlquist"
<richard@karlquist.com> wrote:

>That is only an issue with DC, which doesn't apply here.

------------ REPLY FOLLOWS ------------

Not so. The voltage division vs leakage issue applies at any
frequency. The capacitor responds to the instantaneous voltage at any
moment in time, AC or DC.

73, Bill W6WRT
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