[GreenKeys] Baudot's machines

[John W9DDD]

I as wondering how they measured in synch?  No oscopes back then. Maybe some sort of range finder and tune for best copy?  But different test signal for each channel?

John, W9DDD


> On Nov 21, 2021, at 2:39 PM, Duncan Brown <duncanancy at earthlink.net> wrote:
> 
> Thanks to Tom for the history lesson!
> 
> For extra credit, how where the multiplex distributors kept in synchronization? What was used for a frequency standard in the 1880s?
> 
> 73
> Duncan
> K2OEQ
> 
>> On 21-Nov-21 16:48, Tom Hunter wrote:
>> Jim,
>> 
>> The Baudot system (1874) was inherently time division multiplex. He used four five-key keyboards. They were sequentially connected to the line by a distributor. A synchronised receiving distributor separated them and sent each to its own printer.
>> 
>> In 1901 Donald Murry Developed the code we use today.
>> 
>> The start-stop system was not invented until 1907 by C.L. Krumm and H. Krumm and eventually Teletype Corporation was born.
>> 
>> Download navships 0967-255-0010 from Nick England's site. You will learn more than you ever wanted know about Teletypes. It is fascinating reading.
>> 
>> 
>> Tom   N3CRK
>> 
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