[RTTY] Code Permutation Tape Printer - what?

[Kok Chen]

On Nov 27, 2013, at 7:21 AM, N4BE_Jim wrote:

> http://www.ebay.com/itm/VINTAGE-CODE-PERMUTATION-TAPE-PRINTER-TELETYPEWRITER-TELEPRINTER-TELETYPE-/331075091839?&_trksid=p2056016.l4276
> 
> What is this?

I have no direct knowledge of what this is... however, this may shed some light...

Back before Howard Krum (you can see a reference to his 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.

73
Chen, W7AY