John, For connecting ANY radio to HRD (or any other application) for rig control, You connect the computer serial port TXD to the RXD pin on the radio, and the RXD of the port to the TXD pin on the radio. Those are pins 2 and 3. You also must connect RS-232 Signal Ground which is pin 5.
That will get you operational with any (and all) rig control applications, not just HRD. Now then, if you were asking about DM780 (for digital modes), the answer is extended - you must provide a path between headphone out of the radio to the computer line in soundcard jack - isolation of the grounds between the radio and the computer may be necessary for noise (hum) free operation. For audio going the other way, the line out on the computer connects to mic in on the radio, but through an isolation transformer and an attenuator to reduce the level by about 10 times - line level will overdrive the mic input without the attenuator inserted in the path - a series 100k resistor and a parallel 10k resistor (on the KX3 side of the 100k) will produce a usable attenuator. Of course, these things are what is done in the digital interfaces available from several different sources. I have spoken in generalities about what those interfaces consist of - you can homebrew your own or purchase one of the various brands that suits your operation. 73, Don W3FPR On 3/16/2012 5:54 PM, John Lally wrote: > What are the connections and instructions for interfacing Ham Radio Deluxe > and the KX3? > > > > Thanks. > > > > John Lally > > W7JJL > > ______________________________________________________________ > 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 > ______________________________________________________________ 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
