[GreenKeys] Fw: New Introduction

[Henning DF3OE]

Hello Nico,

I have posted a message for you in our German teleprinter forum.

The standard European current is 40 mA, in particular for Telex networks.

Henning

www.teleprinter.net






2010/2/16 Sam Hallas <s.hallas at ntlworld.com>

> Nico de Jong wrote:
> >  For the danish data museum, I'm presently trying to revive a
> >  teleprinter called GNT, type 15. It has built-in puncher and tape
> >  reader. It seems to come from the danish telex network, as it has
> >  been type approved by the PTT. My guess is that the connections are
> >  identical to Siemens, as there are 8 cables with the same colors as
> >  used by Siemens. Furthermore, I can measure about 200 ohm across 2
> >  combinations. What I cannot guess, is whether it is a 20 or 40 mA
> >  machine. Siemens uses 40. What could happen if I press 40 mA through
> >  a 20 mA machine ?
>
> Nico,
> Hello there from the UK.
>
> I didn't know that GNT made any printer equipment. I have seen
> advertisements for their Morse equipment in old magazines - undulators,
> reperforators etc. Is it conceivable that you have a re-badged Lorenz
> LO15? Here's a picture of one in the RAF Signals Museum up the road from
> me.
> http://homepage.ntlworld.com/s.hallas/greenkeys/21_Lorenz_LO15.jpg
>
> On the current question: Is there a series resistor for local copy? If
> it's 2k then the magnet is 40 mA. 4k and its 20 mA. I think that if you
> underrun a 40 mA magnet the print will be unreliable and possibly
> erratic. Best to try that way round rather than to burn out the magnets!
>
> Henning Treumann, DF30E, may be able to answer your questions if he's
> reading.
>
> Cheers,
> Sam Hallas
>
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