There is a setup guide by microham. In microham router go to help and after that check and download u3 dx4win setup guide. Follow this guide. As i know usb iii (and usb ii) is not capable to transmit on fsk. Mmtty alone is needed comfsk to make fsk. Writelog and n1mm also has a similar software interface to make the rig working fsk with these devices. Dx4win does not. So the only way is to run rtty like afsk. This in practice means that it doesnt work when you choose RTTY button in your rig but instead of this you should choose PKT-LSB (if it is yaesu) or something similar (what you use for PSK) or LSB if there is nothing similar in your radio. 73 Kostas sv1dpi
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