On Mar 18, 2005, at 8:12 AM, Vic Rosenthal wrote:
> R. Measures wrote:
>
>> Bandswitches with needle points should be avoided.
>
> The lugs on rotary switches often have sharp points.
But not sharp enough to cause premature ejaculation of electrons. The
breakdown potential of the bandswitches used in SB-220s and TL-922s
tests at c. 5000v. The actual peak potential encountered in the 220
and 922 is c. 2800v-pk max. Even when they are deliberately mistuned,
the peak potential maxes out at c. 3600v. Thus, when a bandswitch arcs
in a SB-220 or a TL-922, either something other than HF energy is
present, or a dreaded silver-spitting Bolovian blue cockroach has been
in the vicinity.
> When wires or straps are
> cut, this can result in a sharp point. It's worth making sure that
> parts that
> will be at high potential are smooth.
>
> --
> 73,
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco
>
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>
>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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