Ron, > I am guessing that I want unbalanced audio. The scheme I have > seen for this is pin 2 for signal, pin 1 for ground, and that > is jumpered to pin 3. The 1/8 inch tip to XLR pin 2 and sleeve > to XLR pin 1.
The rear panel mic input does not ground the sleeve of the 1/8" (3.5mm) jack - it is raised by an RF choke. You will want to use twisted pair wire with pin 2 of the XLR connected to the tip of the 1/8" plug and pin 3 of the XLR connected to the sleeve. If you use shielded cable, connect the shield to pin 1 of the XLR and bring it out as a flying lead to the ground terminal on the K3's rear panel. Do not jumper pins 1 and 3 of the XLR unless the "low side" of the mic input is connected DIRECTLY to ground/chassis. Doing so will add hum and noise to the input signal (the "pin 1 problem"). > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Ron Kenwood > Sent: Friday, October 24, 2008 2:41 AM > To: Elecraft > Subject: [Elecraft] XLR microphone to K3 wiring > > > I want to connect a mic with a 3 pin XLR connector on its > cable end to > the rear panel of my K3. No instructions came with the mic. This will > require a female XLR to 1/8 inch mono connector. I have seen > a couple of > different ways that mics may be wired. Balanced or unbalanced and > apparently there can be some variation in which pins are used > for what. > > I am guessing that I want unbalanced audio. The scheme I have > seen for > this is pin 2 for signal, pin 1 for ground, and that is > jumpered to pin > 3. The 1/8 inch tip to XLR pin 2 and sleeve to XLR pin 1. > > Does this sound right? > > Ron W3ZV > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > 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: Elecraft@mailman.qth.net 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
