[GreenKeys] SAQ VLF using 5-bit tape

[Duncan Brown]

Harold,

Early (80-100 years ago) receivers & transmitters were not as stable as 
they are now and RTTY would have been a problem. Also Morse could be 
machine sent much faster than TTY.  Many ships only used Morse for 
communications. So the machine converters were necessary.

High speed, machine sent Morse was a standard for many years. Besides 
giving higher thruput (200-500 wpm), it also gave some security, since 
casual listeners would not have the equipment to copy it.

I think there are pictures of US Navy Morse/TTY and TTY/Morse converters 
on Navy-Radio.com

Maybe RD from KPH can tell us more about how there were used. I know 
they received a conversion machine in a few years ago.

73 & Have Fun,

Duncan
K2OEQ


On 25-Dec-21 14:32, Harold Hallikainen wrote:
>
> On Sat, December 25, 2021 12:09 pm, Duncan Brown wrote:
>> Henning,
>>
>> I believe it is a Hell Elektronischer Gerber Typ  EG 21. It reads the 5
>> bit ITA2 code and converts to Morse.  If you look at the tape in the
>> picture I sent, you can see the three groups of VVV: 11110 11110 11110.
>>
>> Messages would come into the big radio relay stations overland by
>> teletypewriter, but then had to be converted to Morse to be sent out
>> over the radio. At the other end, the Morse message would have to be
>> converted back to land-line teletypewriter.  Rather than have an human
>> operator do the conversions, machines were developed to do the Morse to
>> TTY and TTY to Morse conversions.
>>
>> Merry Xmas & Happy New Year,
>>
>> Duncan
>> K2OEQ
> That is amazing! I could see converting TTY to Morse if there was an
> operator at the other end to receive the Morse. But instead of having a
> machine convert Morse back to TTY, it sure would have been simpler to just
> transmit the TTY code.
>
> There have been some interesting approaches over the years. I think KPH
> used high speed Morse from punched tape and received to a tape "chart
> recorder" that would then be decoded by hand.
>
> Harold
> https://w6iwi.org
>
>
>
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