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 > -- Joe Harris, N1QD ______________________________________________________________ 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
