[RTTY] New Computer, IC-756 PROIII and MMTTY

[Joe Subich, W4TV]

See the top diagram on page 19.

"AF Input" of the TNC is "Line In" of your sound card,
"PTT" is the DTR output of your serial port with an open
collector transistor driver. "RTTY Keying" is the FSK
signal - the TxD output of your serial port - again with
an open collector transistor driver to convert the RS-232
levels to "contact closures."

Schematics for the open collector drivers are shown on Don's
web page:  http://www.aa5au.com/rttyinterface.html

73,

    ... Joe, W4TV


On 5/20/2012 12:07 AM, allan1 at dejazzd.com wrote:
> I would like to use MMTTY with my PROIII and my computer.  Anyone have any thoughts or hnits as to how to do this?  I want to use the ACC1 on the back to access everything.  The manual only indicates how to hook up the PRO111 to a TNC which is not needed for FSK with this rig.
>
> Thanks
>
> Allan W2TN
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