[Amps] Amps Digest, Vol 208, Issue 9

Fri Apr 24 10:48:23 EDT 2020

The KW matchbox has an AC relay. Its operated for TR switching from any 
of the Johnson transmitters. Later models added a selenium rectifier and 
a capacitor to the circuit to place DC on the relay coil. This was done 
to add a delay to the antenna switching.  Class C amplifiers really get 
upset when you pull the antenna out from under them.  This allowed the 
transmitter to unkey and then, with a slight delay, the antenna relay 
would switch.

If you wish to disable the relay you can simply unscrew the braid leads 
and move them over to the other side of relay. You can remove the 
rectifier and cap and feed AC to the relay or you can feed DC to the 
relay.  You can send me a picture of the relay and I can see if it is 
factory and what has been done. I have rebuilt and or repaired a number 
of these.

C

On 4/23/2020 9:00 AM, amps-request at contesting.com wrote:
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> Today's Topics:
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>     1. Re: Johnson KW Matchbox relay question (Jim)
>     2. Re: Matchbox and relay (Rob Atkinson)
>     3. TenTec Titan GOLD Power Supply Failures Pictures (Jim)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 22 Apr 2020 06:59:07 -0500
> From: Jim <jimw7ry at gmail.com>
> To: amps at contesting.com, Victor Rosenthal 4X6GP <k2vco.vic at gmail.com>
> Subject: Re: [Amps] Johnson KW Matchbox relay question
> Message-ID: <14381b61-3714-943a-7c8e-54b78322c94b at gmail.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> 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 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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> ------------------------------
>
> Message: 2
> Date: Wed, 22 Apr 2020 15:47:30 -0500
> From: Rob Atkinson <ranchorobbo at gmail.com>
> To: "amps at contesting.com" <amps at contesting.com>
> Subject: Re: [Amps] Matchbox and relay
> Message-ID:
> 	<CALWD7Z5=5qQez9B3WMSmNnuKhvhmRbWu90o9k2dzjOMfNvNSDA at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
>> I think it could easily handle 4 kW on CW and SSB.
> Wellll, that's a stretch.  The KW MB was designed to handle 1 KW input
> phone and CW.  On phone, that's roughly 700 w. output, modulated to
> roughly 2.8 KW.  EFJ probably designed it with some degree of
> overkill, but I think I'd expect some flash over on 4 KW.
>
> 73
> Rob
> K5UJ
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 22 Apr 2020 16:39:05 -0500
> From: Jim <jimw7ry at gmail.com>
> To: amps at groups.io, "amps at contesting.com" <amps at contesting.com>
> Subject: [Amps] TenTec Titan GOLD Power Supply Failures Pictures
> Message-ID: <68abf0df-e771-b5b5-8594-1b7de10c8cb5 at gmail.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> I added some photos from Mark, N1UK from his Ten-Tec Titan Gold
> amplifier power supply issues..
>
>
> https://photos.app.goo.gl/2MptkB1x5FMWUjkS8
>
>
>
> Thanks
> 73
> Jim W7RY
>
> On 3/25/2020 6:58 AM, Jim W7RY via Groups.Io wrote:
>> Pictures of the Ten-Tec Gold power supply are here:
>>
>> https://photos.app.goo.gl/2MptkB1x5FMWUjkS8
>>
>>
>> -- 
>> Thanks
>> 73
>> Jim W7RY
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> End of Amps Digest, Vol 208, Issue 9
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