Vic..
You can easily tell if its an AC relay if it has the copper shading ring
on the top of the coil near the wiper.
Thanks
73
Jim W7RY
On 4/21/2020 11:29 AM, Victor Rosenthal wrote:
Paul,
Thanks. It's a DC relay then. I'll put together a little power supply
for it. I want it to reconfigure my open-wire dipole as a T shaped
vertical for 80m. I need a relay that can stand the very high voltage
when using it in the two-wire mode and that one looks pretty good.
73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
On 21/04/2020 18:23, Paul Christensen wrote:
Vic,
The schematic shows a 16uF/250 cap directly across the coil. An
18-ohm/2W
resistor is in series with what *appears* to be a cap that together
are in
series with the 115 VAC source. However, that cap is shown on the
schematic
as two small "plates" but those plates may in fact be a rectifier,
possibly
even selenium. That's the only configuration that makes sense to me.
Paul, W9AC
-----Original Message-----
From: Amps <amps-bounces@contesting.com> On Behalf Of Victor
Rosenthal 4X6GP
Sent: Tuesday, April 21, 2020 10:56 AM
To: Amps reflector <amps@contesting.com>
Subject: [Amps] Johnson KW Matchbox relay question
Not exactly an amp question, but you guys will know.
I have a relay that was removed from a Johnson KW matchbox. I know the
Matchbox relay operated from 115 vac, but the relay is not an AC relay.
I suspect that at some point the Matchbox contained a rectifier and
possibly
other components.
I tried the relay on 32v dc and that was enough to hold it, but not
pull it
in. 115 vac just makes it hum.
I suspect it is a 115 V DC coil. Does anybody know before I destroy
it with
my experiments?
Part no. is EF Johnson 22-1153 or AEMCO 51-2595.
--
73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
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