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Question for  rmarotta

Posted on 1998-06-30
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Last Modified: 2013-12-27

Regarding top my previous question, remember that you gave me the following answer:

      Are you speaking of the mark and space frequencies for frequency shift keying? (FSK)
      If so, perhaps this is what you want:

      FSK frequencies:

      2400 baud Space = 2450 Hz, Mark = 4450 Hz

      1200 baud Space = 1300 Hz, Mark = 2100 Hz (Bell 202R compatible)

      300 baud Space = 1070 Hz, Mark = 1270 Hz (Bell 102 compatible)

      Please re-open the question if the current proposed answer has not provided a solution for
      you.
      Then I'll submit this one if it is what you want.
      Regards,
      Ralph

I want to add a little question. Could you also specify the duration of the mark and space frequency. How long do the mark frequencies last and how long do the space frequencies last.

Thanks for your help
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Question by:ms99y
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Expert Comment

by:rmarotta
ID: 1146974
Sorry for the delayed response, but I've been away from the computer on a trip.
I'll look for your info tonight and let you know what I come up with.
Regards,
Ralph

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Accepted Solution

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rmarotta earned 60 total points
ID: 1146975
ms99y,
Early teletypers used the neckbreaking speed of 50 baud (which means that one step is 20ms), 5 bits of data, no parity and 1.5 stop bits (don't ask me why!). Your PC is capable of serial transmission at up to 115,200 baud (step size of 8.68 microseconds!)..... (taken from the following site)

I think you'll find what you're looking for here:
gopher://wiretap.spies.com/00/Library/Techdoc/Comm/serialpc.faq%09%09%2B
Let me know if you need more.
Regards,
Ralph
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Author Comment

by:ms99y
ID: 1146976
Thanks for your answer

Regards..
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