Dave, You can use a sound card program like MTTY or MixW which lets you set up the com port on a PC for FSK to your rig. Here is one way http://www.aa5au.com/rttyinterface.html The best way in my opinion is to use an opto-isolator something like this http://www.qsl.net/k0bx/soundcard.htm
You know you can use your narrow filter in USB and LSB. When I had my 746 non-pro, I just told the radio that the narrow filter was actually a SSB filter. 73, Mark N5RFX >I know the 746 keys FSK from the ACC socket on the rear, but is there >any way to key this mode without having a TNC?
