[GreenKeys] How The Teleprinter Works- 1940 (11:05 mins)

[Ed Sharpe Archivist for SMECC via GreenKeys]

ops! my  mistake mean st6... in other words a plan old   ham  tu  unit.. Ed!
 
 
In a message dated 1/28/2015 3:17:22 P.M. US Mountain Standard Time,  
s.hallas at ntlworld.com writes:

COURYHOUSE at aol.com wrote:
> just  to clarify... single  current  working is like  comes out of the
> back of HAL  st-5000  tu?

I wouldn't know what comes out of an ST5,  Ed.

By single current, I meant on/ off keying. Double current meant  
positive/ negative current.

I think the terms go back to Morse  telegraphy on long cables. Double 
current was used on undersea cables with  a mirror galvanometer to detect 
the signals at the far end.

Does  that clarify  it?

Cheers,
Sam

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