I haven't had a chance to try to run the rig off a battery. However, I was able to record the sound using my iPhone.
I have uploaded the audio file here: http://alien.liltechdude.com/files/Recordings/kpasqueal.mp3 I made sure the fan power cables weren't touching the fans/each other. AB3LS On Mon, Jun 27, 2011 at 10:14 PM, Guy Olinger K2AV <[email protected]>wrote: > If you can do it, see if you still have the noise running off a > battery. 73, Guy. > > On Mon, Jun 27, 2011 at 8:37 PM, Adi Andrei <[email protected]> > wrote: > > The fans are still but I still hear it. Almost like some switching PSU > > noise. > > > > Adi > > 2e0ttx > > > > On 27/06/2011 15:21, Guy Olinger K2AV wrote: > >> > >> 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 > ______________________________________________________________ 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
