[AMRadio] ground sticks again


Jim candela jcandela at prodigy.net
Mon Jun 5 00:43:27 EDT 2006



Humans are expendable, but don't destroy them hard to find capacitors! :-)

-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net]On Behalf Of Donald Chester
Sent: Sunday, June 04, 2006 11:25 PM
To: amradio at mailman.qth.net
Subject: RE: [AMRadio] ground sticks again



>Grounding capacitors can be unfriendly, but lifesaving in the longer term.

Not only unfriendly, but it can ruin the capacitors with excessive
instantaneous current surges.  Better to first discharge through a
resistance to limit the discharging current, then apply the "coup de grace"
by shorting  directly.

Large oil-filled transmitting capacitors are expensive and hard to find.
Like tubes, we need to take extra precautions to preserve them as long as
possible.  I suspect that with the advent of solid state equipment and lower
operating voltages, that HV capacitors in a  few years will be as hard to
find as most transmitting triodes are today.

Don k4kyv


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