[GreenKeys] Hasler Teleprinter

[Nico de Jong]

>> 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
>
> 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. 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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