Lew, The Elecraft documentation shows the mic ground connected to pin 7, the PTT ground connected to pin 8 and both pins connected to chassis ground through a common RF choke.
In some stations, the common RF choke results in common mode RF (also known as a "Pin 1 problem") feedback. The proper connection would be: mic return to pin 7, PTT ground (chassis) to the SHELL of the Foster plug and the SHIELD of the mic cable to the SHELL of the Foster plug. The mic cable SHIELD should NOT be connected to the MIC element (it should connect to the CASE or float). 73, ... Joe, W4TV > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of lew > Sent: Monday, October 13, 2008 12:34 PM > To: [email protected] > Subject: [Elecraft] Microphone ground > > > Does the Elecraft require a microphone ground as well as the usual > ground for its microphone connector? If so, should it go to > to pin 7 or > 8 on the Elecraft mike connector? If not, are both ground > connections > necessary to be made to pins 7 & 8 in the connector? > Thanks, > Lew W7EW > #1560/1561 > _______________________________________________ > Elecraft mailing list > Post to: [email protected] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
