And, for even more information, I analyzed the audio that I recorded and the squeal is right around 12Khz. It peaks at -48dB (louder than the QSK relay clicking)
http://imgur.com/V8o5t - image of the analysis AB3LS On Thu, Jun 30, 2011 at 8:17 AM, Geoff Wolf AB3LS <[email protected]>wrote: > Forgot to mention, > > That recording was made using QSK CW in the TX Test mode. > > AB3LS > > > On Thu, Jun 30, 2011 at 8:12 AM, Geoff Wolf AB3LS <[email protected] > > wrote: > >> 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
