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
