[GreenKeys] Model 28 Telex?

[R Russell Miller]

Jim,

You are correct!

A Western Union Telegraph Company Telex machine interfaced with the Telex
exchange in one of two ways.  The first option was a "local loop" which was
a 5 ms loop when the Telex machine was idle and then a 60 ma loop when the
Telex machine was in operation. The second option, sometimes called long
distance or polar was used when a 60 milliampere connection could not be
achieved, provided a ground return polar circuit using 35 milliamperes on
separate send and receive wires.

73
Russ WA3FRP

On Tue, Jun 24, 2025 at 1:33 PM Jim Cooper <jim.w2jc at gmail.com> wrote:

> On 23 Jun 2025 at 15:35, Harold Hallikainen via GreenKeys
> wrote:
>
> > Is the "Telex adapter" a Bell 103 modem?
>
> Isn't it unlikely that a BELL 103 would
> be on a Western Union Telex machine?
>
>
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