[GreenKeys] SAQ VLF using 5-bit tape

[Duncan Brown]

Nick,

Where can that video be seen?

I was surprised to see SAQ using a 5-bit code machine for their ID 
wheel.  I would have expected them to have used a 2 bit Morse tape 
loop.  That is what would have been used in the 1920s.  The Hell EG 21 
is probably c1950.

Duncan
K2OEQ

On 25-Dec-21 14:22, Nick England wrote:
> FWIW That 1958 video of the Norddeich Radio maritime station shows 
> Hell’s Wheatstone code keyboard tape perforator and tape keyer.
>
> On Sat, Dec 25, 2021 at 2:09 PM Duncan Brown 
> <duncanancy at earthlink.net> 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
>
>
>
>     On 25-Dec-21 11:50, Henning Treumann wrote:
>>     Merry Christmas to all!
>>
>>     It's a HELL (Germany)  morse code tape reader. It reads Morse
>>     somehow in 5-Bit code and transmitts it as Morse.
>>     You can adjust transmitting speed directly at the reader.
>>
>>     73
>>     Henning DF3OE
>>     i-Telex 925302
>>
>>
>>     Am Fr., 24. Dez. 2021 um 17:33 Uhr schrieb Duncan Brown
>>     <duncanancy at earthlink.net>:
>>
>>         The annual transmission from SAQ on the 17.2 Kc Alexanderson
>>         Alternator
>>         was done this morning. You can watch  the startup and
>>         transmission on
>>         YouTube: https://www.youtube.com/watch?v=Ecg2UrKvNr8
>>
>>         Alexanderson Alternators operating on around 17 Kc with an
>>         antennas 2.5
>>         Km long was the standard for commercial long distance
>>         transmissions;
>>         until hams showed you could do it with 5 tubes and a 100ft
>>         antenna, 100
>>         years ago this month.
>>
>>         Note that the Morse "wheel" to send the "VVV DE SAQ" was
>>         actually done
>>         from a five bit teletypewriter tape. The machine then
>>         converted it into
>>         Morse to key the transmitter.  Many radio stations would
>>         receive news
>>         and telegrams by teletypewriter, but transmit them by Morse.
>>         So there
>>         were mechanical machines to do the translations, in both
>>         directions.
>>
>>
>>         73 &Seasons greetings.
>>
>>         Duncan
>>         K2OEQ
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>
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> -- 
> Nick England K4NYW
> www.navy-radio.com <http://www.navy-radio.com>
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