I've had something similar. The cause on my K3 (SN 2887) appears to be some sort of intermittent problem in the current-sensing circuit. The K3 presumably detects excess current, assumes it is the stereo audio chip being shorted by a mono speaker (it isn't!), and switches itself to mono to protect the chip.
Watch the K3's current meter: at times, mine varies wildly between 1 and N amps where N is 'several', on receive, doing nothing much at all. Right now, my K3 is reading a stable 1.10 amps. The last time this issue happened to me was about 6 months ago. The actual current draw from the supply was stable but the K3's meter was kicking around, occasionally tripping the protection circuit. It cleared up by itself for no obvious reason. I've had it a couple of times before that too. I wonder if it might be a dry joint in that area or a dodgy current-sensing chip. 73 Gary ZL2iFB > -----Original Message----- > From: elecraft-boun...@mailman.qth.net [mailto:elecraft- > boun...@mailman.qth.net] On Behalf Of Tom Boucher > Sent: Monday, 25 February 2013 7:41 a.m. > To: Reflector Posting Elecraft > Subject: [Elecraft] K3: SP 2 switches back to SP 1 during RX in Split > > Yes Richard, this has happened to my K3 several times, always when the > volume is too high and a loud burst of audio occurs. > > 73 > Tom G3OLB > > <<My friend Simon, HB9ATG has a strange problem: While listening in split > mode, suddenly a relay clicks and the K3 switches back to mono, i.e. > CONFIG:SPEAKERS 2 unexpectedly returns to SPEAKERS 1, without his > transmitting or doing anything at all, just listening to the pileup. > This can happen several times a day. > > Has anyone noticed this before? > > 73 de Richard - HB9ANM>> > > __________________________________________________________ > ____ > 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 -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ______________________________________________________________ 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
