Date: Sun, 21 Feb 2010 20:37:06 -0800
From: James Colville <jimw7ry@gmail.com>
Subject: Re: [Amps] hotswitching 30s1
There is no reason to speed up a vacuum relay. 1.8 mS is more than enough
time. Please see:
http://home.earthlink.net/~wd7s/updates.htm
73
Jim W7RY
## I saw that too, years ago. I think he has something amiss in his test
procedure.
Nobody else gets 1.8 msec with just 26.5 vdc applied to a 26.5 vdc coil, on
either a Jennings's RJ-1A, nor a gigavac GH-1 nor the kilovac eq of a RJ1-A
## I had the Kilovac engineer's perform some timing tests for me a few yrs
back.
They indicated that just by doubling the coil voltage [ and using a correct
size
drop resistor] that the op time was WAY faster. They also tripled the coil
voltage,
and got even more speed out of it. Quadruple, and a bit more. Placing a small
cap,
50uf or less, across the drop R, will speed it up even more. [ RC hot shot]
## be aware that applying an overvoltage only speeds up the Op time, and
does nothing for the RLS time.
## Not all vac relays are fast, like the RJ-1A. I use the Gigavac G2 vac
relay,
which is only 15 msec OP... and 9 msec RLS. [ the GH-1 is 6 op / 6 rls]
## The Jennings eq of the G2 is a RJ2-B/C and is 18 msec op / 9 msec rls.
## these slow vac relays need to be sped up. I apply +120 vdc to em, and
drop the Op time down to 6-8 msec. Still no qsk, but faster vox cw/ssb.
Any plane jane open frame mech relay can also be sped up with an over-voltage.
later... Jim VE7RF
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