I use an old MFJ 1278 TNC here. Have three but only one will run Pactor. Not sure where the dividing line is, but have made several Pactor qso's with that TNC...you can usually find them at hamfest. You may have to check with MFJ to find out which ones will handle Pactor... I think MixW32 will receive Pactor, but not transmit. other than that, can't help you. KU4VE