Simon Just checed the help file of mmtty ''Prepare for FSK'' it uses the COM port to out put the FSK signal .. much the same as CW-type uses the com port for cw tx via a transistor switch , or any of the data software uses the CO port as a T/R switch .
I think 'delfi' has the ability to out put a 'fabricated' serial data stream via the com port , may be has a versitile port driver in the package ? G .. from the mmtty help files :- The ground for this FSK signal is pin 5 on the serial DB-9 and pin 7 on the serial DB-25. On the right is the switched output to the FSK input on the radio. With this circuit, when MMTTY sends a "space" (current off) the transistor switch is open and when it sends a "mark" (current on) the transistor switch is closed. This same circuit is used for push-to-talk, see Using a Serial Port to Control PTT, but it is connected to different pins on the serial port. --- In digitalradio@yahoogroups.com, "Simon HB9DRV" <simon.br...@...> wrote: > > Andy, > > > > Can you be more specific about the design requirements? > > > > Simon Brown, HB9DRV > > http://sdr-radio.com > > > > From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On > Behalf Of AC TALBOT >
