Mike, Here's how the mic is wired:
Sleeve = shield ground ring2 = logic ground ring1 = PTT/UP/DN tip = mic audio Since a 3-circuit plug merges sleeve and ring2, a mic with such a plug could be wired to work with the KX3 and provide PTT, though I don't have one with which to test this idea. On the ring1 line, resistance to ground determines the function: PTT: 0 ohms DN: 4.7 k UP: 10 k We may invoke another function with the combination of UP+DN (3.2 k). We could call this a "meta" operation that changes what UP/DN do. For example, their function could switch to band, RIT, or volume up/down. Let me know if your target mic will work with the above wiring as-is, or if a simple mod is required, and we'll add it to our KX3 FAQ. 73, Wayne N6KR ______________________________________________________________ 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
