Julius, If you want to use FSK without giving up radio control you will need two serial ports - one for radio control and one for FSK keying. You cannot do FSK on the same port as radio control (unless you are using the KY; software command, which the vast majority of software, including MMTTY, does not support). If the port you use for FSK is a USB-to-serial adapter rather than a true serial port, you will need to use the EXTFSK plugin for FSK.
In MMTTY you must configure a serial port for PTT (different from the radio control port) in order to use FSK. However, you don't actually have to use this port for PTT; you can configure it, enable it for FSK, and then just not connect aany PTT line to DTR or RTS. MMTTY gives you two other alternatives: you can do PTT either by software control or by keying DTR and RTS on the radio control port. If you use MMTTY's PTT port for FSK and/or PTT, both FSK and PTT will require keying transistors, because these inputs on the K3's ACC connector are TTL-level, not RS232 (FSK from TxD via a keying transistor to pin 5, PTT from either DTR or RTS via a keying transistor to pin 4). If you choose to do PTT using the radio control port (either DTR or RTS), you will not need a keying transistor for this line, because this is an RS232-level input on the K3. For the radio command protocol, just choose Kenwood. The K3's AFSK A mode is operationally equivalent to FSK D, but does not require an FSK keying circuit; instead, you need an audio cable between the sound card's line out and the radio's LINE IN jack. 73, Rich VE3KI _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
