I get this while in TX test mode, 5W, 100W, anything. And yes this squeal is only present when the 100W amp is physically installed (KPA nor or not inst in the config menu)
The squeal is present constantly when in TX mode. The ticking I was describing was keying up the radio in QSK CW with some dits and dahs. There's a pretty profound click between RX and TX. If I key the radio up in LSB in TX test mode the squeal is present 100% of the time while in TX, no matter if there's modulation, power going out, etc. I'll do my best to see if anything is arcing. And to an unnamed comment earlier on, I can hear this squeal at the other end of a decent sized room, I'm not making this stuff up. AB3LS > > On Fri, Jul 1, 2011 at 1:37 PM, Geoffrey Mackenzie-Kennedy < > gm4...@btinternet.com> wrote: > >> 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
