If you are using any kind of rig control with your computer (and therefore have a shield connection between the K3 and the computer, such as via an RS-232 cable), make sure the chassis of your K3 is securely bonded to the chassis of the computer with a very short length of large gauge wire or section of shielded braid. I had to go down to less than a foot of RG-8 shielded braid to eliminate all hum on my signal.
73, Dave AB7E On 9/23/2011 4:33 AM, DK5EW wrote: > Dear Buck, > thanks for your tips but I'm not sure if I have to do any mor because my > K3 is brand new ! > It came 05.September 2011 and has serial 5776. > 73's Erwin/DK5EW > > Am 23.09.2011 13:24, schrieb Buck k4ia: >> It is not a fan, it is RF or other noise getting back into the mic >> circuit. I had the same problem. Check the two mods on the Elecraft K3 >> Enhancements and Application Notes page. Look for Older K3 Mods> >> "Front Panel Microphone" and "Improving the Immunity of the real panel >> RS232 and audio connectors" to see if they apply to your rig's serial >> number. Do both to solve your problem. >> >> >> Buck >> k4ia >> K3 # 101 >> >> On 9/23/2011 6:39 AM, DK5EW wrote: >>> Hi all, >>> I use at my K3 a HEIL PRO SET ELITE "IC", I had this as I use it at my >>> old ICOM IC-275H as well. >>> Now I recognised that I have a small noise on modulation like a fan that >>> gives me some power output when I just push PTT. >>> OK I have in my shack 2 additional fans for cooling the PA so I switched >>> them of. The noise is lower but still there. >>> and there are no other noise sources. So my setting for the HEIL headset >>> are: >>> - MIC: 25 >>> - CMR: 25 >>> - MIC SEL: RP + HIGH BIAS >>> - MIC+LIN: OFF >>> Do you have any idea if I can change setting to cancel that noise ? >>> I can not believe that the microphone is that sensitive to pick up all >>> little noises around. >>> best regards Erwin/DK5EW >>> >>> >>> >>> ----- >>> eMail ist virenfrei. >>> Von AVG überprüft - www.avg.de >>> Version: 10.0.1410 / Virendatenbank: 1520/3913 - Ausgabedatum: 22.09.2011 >>> ______________________________________________________________ >>> 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 >> >> >> > > > ----- > eMail ist virenfrei. > Von AVG überprüft - www.avg.de > Version: 10.0.1410 / Virendatenbank: 1520/3913 - Ausgabedatum: 22.09.2011 > ______________________________________________________________ > 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
