A repeated 12 kHz would be echoed all over the room and lose a lot of it's pulse nature. This continues to look suspiciously like crap from a 12 volt switching power supply that is somehow finding something mechanically resonant in the K3.
Back to asking for 12 volts from a linear supply (transformer and 60 Hz rectifiers) or battery. Is this particular K3 serial # prior to the introduction of gold plated pins for the KPAIO3 connection? 73, Guy. On Thu, Jun 30, 2011 at 1:52 PM, W5UXH <[email protected]> wrote: > I looked at the MP3 file using Goldwave. It appears to me that the "12 KHz" > component is present only during the tics, not continuously. > > The tic period is roughly 270 msec (I have no idea what the tic is of > course). I zoomed in to a single tic (see PDF of images at the link > below). It appears that each tic has a very distinct pattern seen in the > individual samples which I suspect is the 12 KHz energy. > > I have no idea what any of this means. > > 73, > > Chuck, W5UXH > Las Cruces, NM > > https://sites.google.com/site/k3lineoutrecordings/ab3ls-mp3-file-analysis > Images and comments from Goldwave view of the MP3 file > > > Guy, K2AV wrote: >> >> Hi Geoff, below... >> >> On Thu, Jun 30, 2011 at 9:24 AM, Geoff Wolf AB3LS >> <[email protected]> wrote: >>> 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 >> >> With your image I realize I had been making some assumptions. I need >> to fill in some details... >> >> Are you listening to the audio in earphones or are you hearing it in >> the free air. I had been assuming listening with your ears only in >> free air to miscellaneous sound in the neighborhood of the K3. >> > > > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/K3-KPA100-Squeal-tp6518460p6534295.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > 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
