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Re: [Amps] Ideal bandswitch brand for 3 kW out am?

To: "Tom W8JI" <>
Subject: Re: [Amps] Ideal bandswitch brand for 3 kW out am?
From: R L Measures <>
Date: Fri, 30 Jun 2006 04:15:31 -0700
List-post: <>
On Jun 30, 2006, at 2:20 AM, Tom W8JI wrote:

> We couldn't possibly know the ideal bandswitch anyway based
> only on mode, frequency, and power.
> There isn't enough information.
Good point.  As a rule of thumb, the bandswitch needs to have a  
comfortably higher BDV than that of the Tune-C, and the Tune-C needs  
to have a BDV slightly higher than the anode's DC supply. The idea  
here being that an arc at an air variable cap is no big deal, but an  
arc at a bandswitch is.   Also, vacuum-variable caps do not tolerate  
arcs well, so they need to be protected by an external, calibrated  
spark gap.
•• end
> 73 Tom
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