[GreenKeys] Siemens T100 Teletype and Terminal Unit 1960's Australia

[Sam Hallas]

Colin Greenwood wrote:
> I have been restoring an old Siemens T100 with tape reperf and reader. I
> "appear" to have the teletype machine side sorted,
> however I am running it through the old Australian PMG Terminal Unit. I
> have been advised by a very good knowledgeable source to wire up the tty
> without the terminal unit

Colin,
I assume the terminal unit is similar to the Telex unit that the GPO 
used here in the UK. It contains the power unit to supply the telegraph 
loop and the interface circuits to the Telex exchange line.

It's some years since I had a T100 and it got thrown out eventually. I 
seem to recall that the telegraph loop supply was 80v which was common 
in UK Telex.

I searched through my copy of the T100 handbook and found the attached 
page inserted with wiring suggestions. This relates to a 12-way Jones 
plug commonly used in UK installations. Obviously you need to supply a 
telegraph power supply, which you may be able to pick up from the PMG unit.

Fellow greenkeyer, Alf Fisher, has some T100s in use in his museum and 
may be able to help. There may be some other in Oz who know the PMG unit 
and can help.

Cheers,
Sam

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