[GreenKeys] MMTY

[Andreas Müller]

Hi,
it's new to me that MMTTY can be used as a data terminalusing the COM port. I 
use it mostly for ITTY...
Andreas

Am Donnerstag, 7. September 2006 06:06 schrieb John Gibbs:
> There is a way to use MMTTY as a baudot modem.  It would seem only a
> level converter transistor would be needed to extract the RS-232 data
> available on the com port to drive a HV loop keyer transistor.  It works
> here using another baudot terminal, don't have a iron machine  to try it
> on.
>
> I have used MMTTY for years and compaired it to other software programs
> and hardware modems using the same radio rtty signals and it always did
> the best copy.
>
> Here is a copy of the help file in MMtty that refers to the modem setup.
>
> 73 John / VE7BDQ
>
> /Use MMTTY as a Modem
> Hardware Setup
>   - Two Computers
>   - One Computer
>   - Null Modem
>
> Software Set-up
>
> ---------------------------------------------------------------------------
>-- MMTTY can function as if it were a terminal node controller, or modem.
> This mode was useful when there were other programs that could do logging
> or contesting, but required a modem to operate RTTY. This feature has
> remained in MMTTY.
>
> Some contest and logging programs make provision to use MMTTY in the same
> computer as the contest or logging program, and no longer require
> work-around.
> Others use this technique.
>
>
> Hardware Set-Up
>
>
> You can use MMTTY as a modem by using two computers,
> or one computer with two serial ports that can operate at the same time.
>
> Two Computers
>
> One computer runs the contest program that expects a modem to be
> connected to a serial (COM) port. A second computer runs MMTTY,
> and specifies a COM port as MMTTY's output of decoded data.
> Connect the COM ports of the two computers with a null modem (crossed
> wires).
>
> One Computer
>
> The same computer runs both the contest program and MMTTY.
> In the contest program, specify a serial (COM) port as the place where
> a modem is attached. In MMTTY, specify a different serial (COM) port as
> the output of MMTTY. Connect these two ports on the same computer with
> a null modem.
>
> Null Modem
>
> A null modem is a pair of wires crossed so that the output of each
> computer is connected to the input of the other. For a DB-25 (25-pin)
> or DB-9 (9-pin) COM port connector, pins 2 and 3 are crossed.
> Pin 2 on the first end of the cable is connected to pin 3 on
> the second end of the cable, and pin 3 on the first end is
> connected to pin 2 on the second end. This setup is not the
> "official" way to make a null modem. A real null modem cable
> has other connections as well, but for MMTTY, these are the only
> connections you need. You can purchase a standard null modem cable
> at Radio Shack.
>
>
> Software Set-Up
>
> Set-up MMTTY as a modem using the computer on which it is running.
>
> Click Option | Setup TNC emulation, and view the following display.
>
>
> The port definitions are straightforward. Both computers must use the
> same settings for baud, data length, flow control, stop bits, and parity.
> Port numbers can be different, as long as the correct ports are connected
> with the null modem. You can make MMTTY emulate an MFJ TNC 241, a KAM, or
> a Baudot TU.
>
> To see MMTTY's output on the computer that is running MMTTY, you may have
> to play with the echo selection.
>
> Decoded characters should appear in your contest program once MMTTY is
> running.
>
> MMTTY can control a transceiver using software control, key PTT via a port,
> or operate FSK. Even though you control the MMTTY modem computer from
> another
> computer as if it were a KAM, the modem computer can do most of the
>  things that MMTTY can do.
>   /
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