Doug, the answer is yes, but the details depend on whether you are using MMTTY stand-alone or from inside another application (like N1MM Logger or Logger32).
If you are using MMTTY from inside another application, the easiest way is to let the parent application handle rig control and PTT. The parent application and MMTTY cannot both use the same serial port, and in all likelihood you will want the parent to have access to frequency and other information from the radio. If you are using MMTTY stand-alone, then: Open the MMTTY Setup window and select the TX tab. At the top right is the PTT & FSK area. For your situation (AFSK with no serial port other than the rig control port), this should be set to NONE. Below it is a button labelled "Radio command". Click on this button to open MMTTY's Radio command window. Here you can select the serial port you are using for radio control with the K3. Do not do this if you are using MMTTY from inside another program that uses the same serial port! You can use this port not only for PTT control, but also for getting frequency information from the radio into the MMTTY log. To do this, you set the port speed, etc. (38400, 8, N, 1), do not check any of the flow control or DTR/RTS boxes, select "Kenwood, Elecraft" as the Group at the bottom of the window, set Model to "Kenwood, Elecraft", and set the Frequency offset to OFF. You will see commands in the Rx and Tx boxes; these are the software commands MMTTY will use to control the radio's PTT switching. MMTTY can also use RTS on this serial port for hardware PTT switching (with the help of the K3's CONFIG:PTT-KEY set to RTS-OFF), but there is a potential problem with this: If the DTR/RTS box is checked and the Rx and Tx Command boxes are not empty, MMTTY will use both software and hardware PTT methods in parallel, which is not a good idea. Several users who have done this have experienced having their K3 stuck in transmit (i.e. failing to switch back to receive when the software commands it to do so). This appears to be due to a "race condition" in the firmware when software and hardware commands are issued to the radio simultaneously. The work-around is to eliminate one or the other of the two parallel methods, i.e. to use either software (TX; RX;) commands or hardware (RTS or other PTT input), but never both methods at once. 73, Rich VE3KI VE3VS asked: > I use the latest MMTTY software (AFSK), have the two audio lines connected, > and use VOX to operate this mode. At the same time, the serial cable from > the computer to the radio remains connected. > > Question - Is there a set-up that will allow the computer to signal PTT > through the serial cable in order to transmit the RTTY tones, rather than > enabling the VOX switch? ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
