Check to make sure that the cables routed in front of the fans are not touching. A light touch will result in a sound like that. It will change or go away with the fan speed.
73, Guy. On Mon, Jun 27, 2011 at 9:10 AM, Adi Andrei <[email protected]> wrote: > I have the same thing happening, similar series K3 (5k something) , also > assembled in March. > > Adi > 2E0TTX > > > On 27/06/2011 13:38, Joe Harris wrote: >> I have very similar symptoms in my K3/100 (SN 5284) that I assembled in >> March. It makes the sound even if I am in TX test mode. Again, no >> performance issues, just a slightly bothersome squeal / whine. >> >> >> >> On Sun, Jun 26, 2011 at 8:23 PM, Geoffrey Wolf<[email protected]>wrote: >> >>> First off it was a great Field Day and my new K3 impressed me extremely not >>> only in performance but in it's functionality. >>> >>> To kick off Field Day I installed a new KPA100 into the K3. I did all the >>> necessary TX gain calibrations using a dummy load. >>> >>> One thing I noticed immediately was that I was hearing a very high pitched >>> squeal coming from either the PA board or possibly the KIO3 (the board the >>> amp plugs into). The squeal seems to vary in frequency each time the >>> transmitter keys up (can only hear it when the radio is in TX). The squeal >>> is not very loud but its loud enough for me to hear it if I listen closely. >>> It doesn't seem to be power related. The squeal is there even if the radio >>> is in TX but no power going out (RF Pwr set to 0W). The closest thing I can >>> compare the sound to is perhaps a tiny leak in an air hose. Is this typical >>> of a bad solder joint or something? >>> >>> This squeal only pertains to the new KPA100 installation. Before the amp >>> was installed I didn't hear a thing. >>> >>> I should also note that nothing appears to be affecting performance. Puts >>> out 100 watts no problem. Clean modulation, etc. >>> >>> -------------- >>> Geoffrey Wolf >>> AB3LS (Amateur Radio Callsign) >>> University of Pittsburgh '14 >>> [email protected] >>> [email protected] >>> >>> ______________________________________________________________ >>> 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 > ______________________________________________________________ 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
