I do not believe there is a need for 2 com ports. Most logging applications only handle 1 port. They use TXD and RXD for rig control and do keying and PTT with RTS and/or DTR in the same port. All you need in addition to the KX3SER cable is to make two of the "one transistor keying circuit" to convert the RS-232 levels to TTL - connect one circuit to the RTS pin, the other to DTR (in the same KX3SER cable). on the KX3 side of the 2 circuits, one connects to the hand key input and the other connects to PTT.
Actually, you will probably want to make your own KX3SER cable because the production cables will have a molded backshell according to a post by Eric last week - but making your own should not be difficult at all, a male DE-9 connector, a backshell, a 3.5mm stereo plug and some wire - add 2 transistors for the one transistor keying circuits and you are done. 73, Don W3FPR On 3/12/2012 12:51 PM, Tony Estep wrote: > On Mon, Mar 12, 2012 at 11:18 AM, KU7Y<[email protected]> wrote: >> ...I changed over to using a USB WinKeyer... > ======== > I can set up my software to use 2 Com ports, one for > rig control and one for keying, and have a second gadget attached to > the computer to key the radio. ______________________________________________________________ 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
