I just listened to Geoff's recording, and this is exactly what is happening with my K3/100.
On Fri, Jul 1, 2011 at 1:49 AM, Geoff Wolf AB3LS <[email protected]>wrote: > No go. > > Hooked the radio up to a gel cel battery and we're still getting the 12Khz > junk coming from something and the clicking between TX and RX. > > I made a longer recording of the 'junk' and posted it. Cycled between TX > and > RX a few times using the manual TX button on the front. Then finished off > with a few dits and dahs. All while in TX Test mode. > > > http://alien.liltechdude.com/files/index.php?dir=Recordings/&file=kpa3squealrev2.mp3 > > Anyone from Elecraft have anything on this? > > AB3LS > > On Fri, Jul 1, 2011 at 1:24 AM, Geoff Wolf AB3LS <[email protected] > >wrote: > > > 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 > -- 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
