[GreenKeys] History of modems

[Duncan Brown]

Sam & Henning,

Thanks for your information.

I would like to see the Eintontelegrafie

Duncan

On 08-Nov-13 07:26, Henning DF3OE wrote:
> Yes, this system was used mainly in the UK and the Netherlands.
> They used normal phone lines for telegraph/Telex service with a
> teleprinter.
> It definetley was an early modem. It used a single tone for data 
> transmitting (tone/no tone).
> In German it was named Eintontelegrafie (single tone telegraphy).
>
> Will try to scan the section from a 1930s German book showing a set-up
> consisting out of a Siemens teleprinter, the modem and a phone-set.
>
> regards,
> Henning DF3OE
>
> www.teleprinter.net <http://www.teleprinter.net>
>
>
>
>
>
>
>
>
> 2013/11/8 Sam Hallas <s.hallas at ntlworld.com 
> <mailto:s.hallas at ntlworld.com>>
>
>     Duncan Brown wrote:
>
>         It is often hard to pinpoint the "first" of anything, but the
>         for the
>         "first" modem, I always think of the US Signal Corps' TH-5/TG:
>
>
>     I'm sure that's much too late, Duncan.
>
>     I have diagrams from 1935 for Voice Frequency Telegraph Converters
>     used by the British Post Office, which are essentially modems. I'm
>     sure that Bell and Western Union must have been using similar
>     stuff in the US at that time.
>
>     Cheers,
>     Sam
>
>
>
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