Appendix B - Fsk With Mmtty - microHAM USB Interface II Manual

The USB II does not support FSK in the traditional way. However the unit can be used for FSK with the
proper software.
Each radio specific cable set includes FSK connections which are shared with the CW output.
USB II supports FSK from the RTTY program "MMTTY" when the special MMTTY EXTFSK utility is used.
One of the FSK options must be
selected in Tx Port on the "Misc"
tab and "Method C" must be
selected from the "USB Port" button.
window. FSK must be defined as DTR and PTT must be defined as RTS. (Note: COM6 is selected in this
example. However, the actual port will depend on the virtual port assigned for CW and PTT in Router).
If the transmit signal is reversed, its polarity can be changed by clicking the "Inv FSK" check box."
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APPENDIX B – FSK with MMTTY
To use EXTFSK, the same port must be selected for PTT and CW in
the USB Device Router. This port must be selected in the EXT FSK
21
The EXTFSK.DLL file must be
copied into the same directory in
which MMTTY.exe is located and
MMTTY must be configured to use
EXTFSK for PTT and FSK.