You can connect your PC's com port to the K3's com port and use either RTS or DTR to key the radio. Have a look at the PTT-KEY configuration menu item in your owner's manual. Section 3.3.2 in "The Elecraft K3: Design, Configuration, and Operation" describes how to do this in greater detail. An excerpt is:
"There are at least four ways to key your K3 with a computer. The first is to use the RTS or DTR signals in the RS232 serial port connector. Your computer program must be able to send CW (and operate the push-to-talk, if needed) by activating the RTS and DTR lines. The K3 converts the RS232 signal levels (see Appendix B) to the required computer logic levels. The CONFIG:PTT-KEY menu allows you to choose which of the two RS232 signals is used for PTT and which is used for Keying. Table 3 12 shows the CONFIG:PTT-KEY menu to set up for computer keying and PTT. When using this method, make sure CONFIG:PTT-KEY and the computer program keying and PTT choices are the same." Fred Cady fcady at ke7x dot com "The Elecraft K3: Design, Configuration, and Operation" www.ke7x.com > -----Original Message----- > From: elecraft-boun...@mailman.qth.net [mailto:elecraft- > boun...@mailman.qth.net] On Behalf Of iain macdonnell - N6ML > Sent: Tuesday, September 20, 2011 9:58 AM > To: dk...@mmmonvhf.de > Cc: Elecraft@mailman.qth.net > Subject: Re: [Elecraft] com port PTT question > > Hi Erwin, > > You can't connect the COM port directly to the ACC port - you need a > transistor in the middle to convert the high/low voltages to a "pull > to ground". Interfaces like the ones described at: > > http://www.dxlabsuite.com/dxlabwiki/FSKConnection > > would work. > > 73, > > ~iain / N6ML > > > > On Tue, Sep 20, 2011 at 3:42 PM, DK5EW <dk...@mmmonvhf.de> wrote: > > Hello all, > > I have a small problem with PTT via com port and ACC plug. > > I made a 2 pin cable 9pol from PC to ACC 15pol to K3. > > I soldered pin 4 for PTT and pin 5 for ground. > > I tested it for correct wire and short - all O.K. > > Now as soon I connect the TRX-ACC and the com port (serial 9 pin) to > my > > PC the K3 goes on TX. > > Any solution out there ? > > > > -- > > best regards > > Erwin/DK5EW > > > > > > > > > > ----- > > eMail ist virenfrei. > > Von AVG überprüft - www.avg.de > > Version: 10.0.1410 / Virendatenbank: 1520/3907 - Ausgabedatum: > 19.09.2011 > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
