I would short all audio inputs to the K3 right at the connector input with everything disconnected except antenna. Key up radio in SSB and see if audio buzz is still there.
This test pretty much isolates the K3 George, W6GF Love my two K3s and awaiting my KX3 ________________________________ From: Barry N1EU <[email protected]> To: Sent: Friday, January 13, 2012 9:58 AM Subject: Re: [Elecraft] K3 Hum on Audio... Jim Brown-10 wrote > > On 1/13/2012 9:20 AM, Phil Hystad wrote: >> Unfortunately, it is in both mics but not as strong in the Yamaha CM500 >> mic as in the MH2 but it is present. > > The K3 has unshielded audio transformers at all the audio inputs and > outputs, and an unshielded transformer is a sitting duck for magnetic > fields. > I'm fairly certain that there are no transformers being used on the mic inputs, only the line input (mono) and line outputs (stereo). Barry N1EU -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Hum-on-Audio-tp7182701p7184907.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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
