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RE: LF: VX9MRC QRV 507.77 kHz/ Arcing relays &c.

from [Rik Strobbe] [Permanent Link][Original]
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Subject: RE: LF: VX9MRC QRV 507.77 kHz/ Arcing relays &c.
From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
Date: Wed, 12 Oct 2011 09:30:59 +0200
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Thread-topic: LF: VX9MRC QRV 507.77 kHz/ Arcing relays &c.

I'm puzzled by the 6pf/metre rule for monoploes.  It seems the capacitance of the monopole is much higher.

 

Hi Joe,

 

based on a resonance with 3mH @137.8kHz the antenna capacitance would be 445pF.

A rato of 5..6pF/m you should have more or less 75..90m of wire up in the air (vertical and horizontal section).

But the given value of 5..6pF/m is only valid for thin wire. If you use very thick wire or maybe even a tower as part of the antenna the capacitance is larger. For a 1m diameter tower the capacitance can be as high as 25pF/m

 

73, Rik  ON7YD - OR7T

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