I had this problem several months ago. It turns out the mic connector ground (both mic and PTT) goes thru a 0 ohm surface mount resistor (at one time this was a choke, I believe). I bridged this component and the problem went away. I believe the board flexes too much when the mic is plugged in, and this leads to failure of the resistor.
George W2AIV > On Jan 29, 2014, at 17:50, Don Wilhelm <[email protected]> wrote: > > Mike, > > It sounds like a bad solder connection somewhere. > Before you dig into the K3, try the mic directly on the K3. If all is OK, > then investigate the connector for the Duo to K3 cable. > If it persists with the mic connected directly to the K3, then it may be a K3 > problem. > > Right now, there are too many variables - the Duo to K3 cable, the PR781 mic > connector, the DUO itself, and the K3 - all can be suspect. Eliminating the > Duo will reduce the variables to 2 - the PR781 mic plug and/or the K3. > > 73, > Don W3FPR > >> On 1/29/2014 12:58 PM, Mike Sanders wrote: >> Greetings All, My K3/10F now K3/100 plus mostly loaded has a problem. >> The mic connector has to be pressed down a bit to get PTT when using >> the K3 on SSB. I use a Heil PR781 mic that goes through a Rigblaster Duo. >> The connector to the K3 comes from the Duo and is never changed or >> fooled with. Before I pull the front panel module has anyone had this >> same issue and what was the problem? Thanks for any hints/help. 73 > > ______________________________________________________________ > 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
