[GreenKeys] very cool Hell Feldfernschreiber demo

[Duncan Brown]

The AWA Museum has a prototype of the M17 from about 1925-30. The 
engineer that worked on it was E. E. Kleinschmidt.

Early tests in the 1920s with 5-bit TTYs over radio were not very 
reliable. It was felt that the Hellschriber system would be more robust. 
But when AT&T took over Teletype Corp. in 1930, the project was shelved. 
In the late 1930s, the program was apparently revived, the printer 
simplified and put into production.  The major market was apparently a 
printer for police cars.

The M17 prototype used the regular the TTY inked-ribbon on spools. The 
mechanism to advance & reverse the ribbon was the most complicated part 
of the printer. The 1938 version is much simplified with apparently an 
inked sponge wetting the helix.

For more information about the Hellschriber, see 
https://www.nonstopsystems.com/radio/frank_radio_hell.htm
There are details on the Teletype Corp equipment at 
https://www.nonstopsystems.com/radio/hellschreiber-modes-other-mfrs-non-UK.htm#teletype-model-17

have fun,

Duncan
K2OEQ

On 27-Apr-20 18:46, W2HX wrote:
> Hey Duncan. Do any model 17s survive?
>
> -----Original Message-----
> From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> On Behalf Of Duncan Brown
> Sent: Monday, April 27, 2020 1:28 PM
> To: greenkeys at mailman.qth.net
> Subject: Re: [GreenKeys] very cool Hell Feldfernschreiber demo
>
> Thanks, Eugene! That is a good video.
>
> Teletype Corp made a compatible machine. It was known as the Model 17.
> Its original purpose was to be a mobile printer because it is such a simple printing mechanism (the original dot-matrix printer).  But I think most of the M17 units were used to monitor German Hell transmissions during WWII. (Although Teletype Corp did make a Hell transmitter that converted a 5-bit Baudot tape to Hell format)
>
> Have fun,
>
> Duncan
> K2OEQ
>
>
> On 27-Apr-20 12:36, W2HX wrote:
>> https://youtu.be/VDB7wmV7ekA
>>
>> Thought you would like it. Very cool. Radio and teleprinter condition
>> superb.  I enjoyed it!
>>
>> 73 Eugene W2HX
>>
>>
>>
>>
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