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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R L MEASURES, AG6K. 805-386-3734
r@somis.org
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