[GreenKeys] MMTY

[Eugene Hertz]

John, I use the aduio out of my pc running mmtty to drive my ST6 which drives the loop. Maybe a little rube-goldberg, but it works

Eugene

>-----Original Message-----
>From: John Gibbs [mailto:jgibbs at infoserve.net]
>Sent: Wednesday, September 6, 2006 11:06 PM
>To: greenkeys at mailman.qth.net
>Subject: Re: [GreenKeys] MMTY
>
>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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