[GreenKeys] History of modems

[Henning DF3OE]

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








2013/11/8 Sam Hallas <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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