This is a brand new K3 that I assembled about a month ago. The Serial Number is 5517.
I have been using an Astron SS-25A power supply with this which is indeed a switcher. I have a battery that I'll be hooking up to it to see if this is still a problem. On Thu, Jun 30, 2011 at 4:41 PM, Guy Olinger K2AV <[email protected]>wrote: > 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 > ______________________________________________________________ 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
