[GreenKeys] Code Permutation Tape Printer

[N4BE_Jim]

I inquired on the RTTY reflector and got this response from Ben WB2RHM. At first he thought is was an old Western Union Telegram message strip printer. When you sent a WU telegram, the person at the other end (the Addressee) would get a piece of WU Telegram paper with the message glued onto it in lines formed of strips of words. But then he said he missed the picture with REA on the tag. That was a Railway Express Agency machine not a Western Union unit. Most likely 'train orders' and 'rail status messages' were sent from this type of device by REA station Agents. Probably during WWII.

Then Chen W7AY commented:
 (Quote) back before Howard Krum (you can see a reference to Krum's patent in my "RTTY Demodulator" article), Baudot was transmitted as 5 parallel data bits.  Krum invented the start stop system, where one single wire pair can send all the 5 data bits.  I believe "permuted code" was one terminology that was common to describe that back then (almost a century ago -- how time passes, HI HI).  So, this teletypewriter could just be old enough that it boastfully say that it can accept the start-stop Krum system which we take for granted today.  However, this antique is probably also be less than 100 years old.  Krum's patent came out in 1918, and I don't think there was any "permuted code" before then. (End quote)

Jim N4BE



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