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[TowerTalk] Coil Loss

To: "Bill Fuqua" <>, <>,"Jim Lux" <>
Subject: [TowerTalk] Coil Loss
From: "Tom Rauch" <>
Reply-to: Tom Rauch <>
Date: Wed, 2 Jun 2004 21:37:25 -0400
List-post: <>
>> As far as what "appreciable" might be... say the coil has
a Q of 10 (which
> is actually pretty bad).. Running, say, 500 W through it,
you'll dissipate
> 50W, which is a bunch, but probably not too bad when
spread out over 20-30
> square inches.  (2 inch diameter x 5 inches long = 30
square inches)

You may want to reconsider that Jim.

Talking about component Q, the loss might be a fraction of a
percent or extremely high with a Q of ten.

A 10,000 ohm reactance inductor with a Q of ten has an ESR
of 1000 ohms. The loss in a series resonant circuit with a
load resistance of 1 ohm would be staggering.

At the same time, a 1000 ohm reactance inductance with a Q
of 10 would have an ESR of 100 ohms. In series with a load
resistance of 10,000 ohms the loss would be negligible.

73 Tom


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