[GreenKeys] ATTN Europeans And Telex Machine Enthusiasts

[Henning Treumann]

George,

have been copying ITTY 66 wpm for a few hours today. Perfect copy, almost
(99.9%) error free !

Thanks for working on the "European tones". Another problem for us here on
the other side
of the pond is the USTTY alphabet. The quite often used character "$" is
"Who are you?" in ITA2. (shift D)
When copying it with an ITA2 machine (which are 99 % over here) is garbage
printing as the answerback of the receiving machine
starts to send... :-(  Fortunately I have two "USTTY" machines in my
collection that were in use with the US ARMY Germany,
but they are VERY rare to find.

So, if there would be also a way to send this 50 Bauds channel on ITA2 we
would be more than happy here
and I am sure you will have a lot of "listeners". Once you get all this
things fixed I can put the info about
the 66WPM ITTY also on the German language teleprinter collector's mailing
list.

73 & gl,

Henning DF3OE






2010/12/28 George B. Hutchison <w7tty at olypen.com>

> Henning - - -
>
> Thanks for the heads up.
>
> I will reset the tones when I get ITTY moved to its new room.
>
> It will take a counter and a bit of experimenting because the tones on that
> channel are sound card derived, and the constants are not linear, but it
> should only take a few minutes.
>
> Right now I am repairing and aligning a pair of Electrocom terminal units
> that use thumbwheel switches to set the tones. I have no book on that
> particular configuration, so it took a bit of trial and error but I got the
> alignment such that if the switches say 2125, thetuning is dead on, and when
> changed to 2975, they're also dead on.
>
> The electrocom is kinda like the dovetron, in that is uses identical fixed
> filters for the tone processing, and mixes with a variable oscillator, in
> this case an pair of Exar 2206's which directly feed the channel filters.
>
> The display is a CRT that is driven with a pair of Exar 2208's which are
> classed as "operational multipliers". Hard to find chips and expensive as
> hell when you do. But the display is an absolute straight line, both
> horizontal and vertical. Really nice.
>
> Got to get going and run the plugstrips and power into the new "ITTY".
>
> Stay tuned. If there is enough interest I will keep the European channel
> active and you can contribute to it using th ITTY Mailer. Additionally, I
> can also let you folks over there control it by using "Team Viewer", a
> remote screen viewing and control software that works very well, and is free
> for non-commercial use. I use it all the time when I am at work, and have no
> problems with it.
>
> Thanks again for letting me know what the European tone standards are.
>
> 73,
>
> George - W7TTY - ITTY Central
>
>
>