[GreenKeys] Hasler Teleprinter

[Henning DF3OE]

Hi Nico,

the Hasler SP300 in Denmark used a kind of V.21 modem interface.
switching-central: originate mode tones
teleprinter: answering mode tones  (as far as I recall...)

see: http://www.itu.int/rec/T-REC-V.21-198811-I/en


Henning

www.teleprinter.net



2013/4/29 Nico de Jong <nico at farumdata.dk>

> Hello all
>>> I've written before about Hasler teleprinters. I've now dissected the one
>>> I am looking at for the danish IT museum, and it shows that this one is
>>> equipped for oddball tones.
>>> In other words, I need something to convert RS232 (Comport signals) to
>>> these tones.
>>>
>>
>  If you only want to demonstrae the printer from a compute, you can use
>> one of the ham sound card programs. They put out the tones from the audio
>> output of the computer sound card.  Try the mmtty program free from here.
>>
>> http://www.muenster.de/~welp/**sb.htm<http://www.muenster.de/~welp/sb.htm>
>>
>> If you really want to convert from rs232 then look for a circuit using
>> one of the xr2206 IC chips.  This is about as simple as you can get.
>>
>
> Hello all
> I found the MMTTY program, but at http://hamsoft.ca/pages/mmtty.**php<http://hamsoft.ca/pages/mmtty.php>.
> Looks very impressive. The first problem that caught my eye, was the shift.
> As far as I can read the PDF file containg the Hasler diagrams, the mark
> and space frequencies are 1180/1850 or eventually 780/1650, which gives a
> shift of 670 resp 870 Hz. The last mentioned corresponds more-or-less to
> 1700 Hz with a 850 Hz shift.
> I've see that there is a user group for this program, so further enquiries
> will go there.
> Thanks for your help. Much appreciated
>
> /Nico, OZ1BMC
>
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