[GreenKeys] Model 1-A WU Multiplex Trensmitter

[Duncan Brown]

Nick,

Can you send a photo? (you can attach a file up to 1MB on this list)

If it is the one I think it is, it is very simple - just reading the 
five bits from the tape in parallel and then sending it to the 
multiplexer. The stepping of the tape was controlled by the multiplexer 
to keep everything in sync.  Typically there would be four 
parallel-output tape transmitters connected to a multiplexer with a 
serial output.

Time Division Multiplex in 1912!

(The Western Union Multiplex System started in 1912 with the purchase to 
rights of the Murry Multiplex System, but it was based on Emile Baudot's 
invention of about 1880.)

Once I see what you have, the AWA Museum may have some documentation on it.

Have fun,

Duncan Brown, K2OEQ
USASA  31J30

Antique Wireless Association Museum Asst. Curator, Commercial Equipment
(also Chief TTY operator & repairman)
http://www.antiquewireless.org/



On 24-Nov-16 22:14, Nick wrote:
> I am in the process to restore a Model 1-A Western Union Multiplex 
> Transmitter. She is fully functional now - just needs a little more 
> tlc. Will post pics soon.
> Nick  -  N0NCQ
>
>
>
> Sent from my T-Mobile 4G LTE Device
>
>
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