[Amps] Johnson KW Matchbox relay question
Victor Rosenthal
k2vco.vic at gmail.com
Tue Apr 21 12:29:49 EDT 2020
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 at contesting.com> On Behalf Of Victor Rosenthal 4X6GP
> Sent: Tuesday, April 21, 2020 10:56 AM
> To: Amps reflector <amps at 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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