Geoff, It struck me when the squeal was first mentioned that something might be arcing over. If I understand correctly the squeal appears only when the 100w TX amp is - which narrows the search if arcing is the cause.
If the 12 KHz squeal is present only when a tic is generated, and if arcing is the cause of the squeal, then a possible reason why this occurs is that the voltage in some circuit is ramping up to a voltage every 270 msec sufficient to cause something to arc over, which is heard as a tic plus squeal. It might be worth looking inside your K3 in a dark room. 73, Geoff GM4ESD On Friday, July 01, 2011 at 6:24 AM, Geoff Wolf AB3LS 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 1:52 PM, W5UXH <chuck.broadw...@gmail.com> 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. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
