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
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|