[GreenKeys] Quick help w model 32

[Joe Duszyński]

The polarity issue is for the dialer signaling.
If a model 15/19 has a dialer with power control it would cause the same
issues.

The way you call a telex you initiate the dialing sequence with the call
button and dial when the dial light comes on or the system pulses(very
audible click). after dialing the switchboard sorts out where the signal is
going and on the remote/called machine it reverses the line current to turn
that machine on(Sort like a ring). Once the switchboard sees the reversal
has good current it reverses the current on your local machine and also
turns it on.

If there is an error like the remote does not answer with good current or
your machine does not respond with good current. The switchboard will do a
quick reversal of your local machine briefly turning it on and off to
signal that there was a connection error (sort of like a busy signal).
The reason for the current not being good is pressing the break key or the
disconnect (they both do the same thing interrupt the current for more than
a second or two).

Without the switchboard you can put a DPDT toggle in line and swap the
current to accomplish the same things the switchboard does.

That is about the most simplistic explanation I can give you.
If you want deeper info you can look at the i-Telex project using google
translate (its mostly german) there is a good description of how it all
works.
The US version of the signaling is approx the same the current levels here
will be slightly higher.

JD





On Sun, Jun 26, 2022 at 12:36 PM Harold Hallikainen via GreenKeys <
greenkeys at mailman.qth.net> wrote:

> Interesting! I'm really most familiar with the model 15, and polarity does
> not matter. I'd often thought about how a polar selector magnet would
> work, just like a polar relay. Instead of the armature being pulled away
> from the selector magnet by a spring, it would be pushed away by an
> opposing magnetic field. But that would require a bipolar loop, and here,
> it appears it's still a non-polar loop, but is polarity sensitive. How is
> that? I have heard of using polar relays on non-polar loops by applying a
> bias current.
>
> Thanks!
>
> Harold
> https://w6iwi.org
>
>
> On Sun, June 26, 2022 8:59 am, Jeffrey Golas wrote:
> > The polarity was the answer! Got the 32 working..AT FIELD DAY! Just did
> HF
> > rtty to it, but it would be cool to get a distance Rtty while the club is
> > watching. Were eating at the moment tho.
> >
> > Jeff
> >
> >> On Jun 26, 2022, at 11:40 AM, WAYNE <teletypeparts at comcast.net> wrote:
> >>
> >> 
> >> Jeff,
> >>
> >> The 32 should be in Connect mode when the ST 6 turns it ON.
> >>
> >> Local and other 32 Telex modes are not used.
> >>
> >> When you hook up the Telex to the ST 6 the Telex should either shut off
> >> or be in Connect mode.  If it shuts off, reverse leads.  Not too
> >> familiar with ST 6 but my ST 5000 has a power plug on the back to plug
> >> the Telex into.
> >>
> >> I looked up the ST 6 and there is a power plug on the back.  Its labeled
> >> Motor.
> >>
> >> If you want to just fire up the TTY there should be a Local button on
> >> the ST 6.  Not sure of this but others on the list likely are.
> >>
> >> 73,
> >>
> >> Wayne
> >> KB1FDW
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