[GreenKeys] model 32 western union telex machine

[R Russell Miller]

Hi Dennis,

I'll forward you a copy of the schematic directly to your email address.  I
don't think that GREENKEYS will allow me to send this schematic as an
attachment.

First of all the Telex service was 50 baud as opposed to Amateur Radio RTTY
which is 45.45 Baud.
Second, the keyboard is slightly different.  An Amateur Radio RTTY machine
used uppercase S as BELL while you will see that your Telex machine used
uppercase J as BELL.  Uppercase D on an Amateur Radio RTTY machine is $
while a Telex machine uses uppercase D as the WRU or request for
answerback.
Third, the Telex service had two different ways to connect a Telex machine
to the Telex exchange.  The first was loop or local which was 60 ma. This
would match the interface provided by the standard RTTY converter such as
the HAL ST-6 where the power to supply the loop current comes from the RTTY
Converter.   But there was a second mode called polar or Long Distance (LD)
that operates at 35 MA, ground return.  You will need to see if there is a
polar adapter in your Telex machine.  If yes, you need to remove it.

An alternative to converting your Telex machine to Amateur Radio RTTY
operation is to join the i-Telex network.  Here is a link to information
about this worldwide network of individuals using old Telex machines and
communicating via the Internet.  https://www.i-telex.net/

73
Russ WA3FRP
Telex 834-328 WUTMPAM CHIL

On Mon, Jul 13, 2026 at 6:44 PM Dennis Kwasny via GreenKeys <
greenkeys at mailman.qth.net> wrote:

> Hello to all,
>
>
>
> I acquired a model 32 ASR  that was used in western union telex service. I
> would like to try to restore and use it for amateur radio RTTY. The motor
> runs but I believe the call control unit is not operational and there does
> not appear to be any loop current to the selector magnets so the keyboard
> is not functioning at this time.
>
>
>
> I have tried to locate schematics (Navy Radio site) for the machine, but
> to no avail. Paul Cembura (Mr. Teletype) has told me that these machines
> were proprietary to western union so there isn’t any schematic information
> from teletype corp.
>
>
>
> My questions are:
>
>
>
>    1. Does anyone have schematics or wiring diagrams for a  western union
>    model 32 they would be willing to share?
>    2. Does anyone know what speed and baud rate the machine might have
>    operated at when it was used by western union?
>
>
>
> Appreciate any help in advance.
>
>
>
> Dennis
>
> WA8ZRK
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