It's a microphone bias supply. If your audio equipment provides bias (the K3 can), then you can plug the microphone in directly. If the equipment doesn't have the ability to provide bias voltage, the battery pack will.
Dick, K6KR -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Chris Hembree Sent: Monday, November 15, 2010 7:36 PM To: Elecraft@mailman.qth.net Subject: [Elecraft] OT (Yamaha Cm 500) Just got my CM 500 today. Would someone please tell me what the black box with 2AAA batteries is for. Plus how do you like the mic on the cm500? I can't see it being as good as the Heil GM-5. Comments please. Chris W7CTH ______________________________________________________________ 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 ______________________________________________________________ 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
