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[AMPS] 811A Plate Impedance?

To: <amps@contesting.com>
Subject: [AMPS] 811A Plate Impedance?
From: W8JI@contesting.com (Tom Rauch)
Date: Mon, 16 Oct 2000 08:23:05 -0400
> >You have to almost double Q to get a significant improvement in second
> >harmonic, and you also will nearly double tank heating.
> 
> How come? If you double Q, do you not double the circulating current? In
> that case, isn't the power lost quadrupled ( I squared R) leading to 4
> times as much heating?
> 
> Where have I gone wrong?

Tank efficiency is roughly (1-Ql/Qu) * 100

For an unloaded Qu of 250 and loaded Ql of 10, efficiency is 96%
For an unloaded Qu of 250 and loaded Ql of 20, efficiency is 92%

Loss roughly doubles from 4% to 8%, but some of the loss is not 
in the tank.


73, Tom W8JI
w8ji@contesting.com

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