In prep for field day, I decided to stage everything last night and also ran into the same problem as you describe. I re-seated all the cables. No effect. I turned on the rx shft on the kx3 and the nasty noise shifted away. Ok, that's good. But not what I wanted.
I disconnected the USB acc1 cable from the small computer I was planning to take with me to FD and the noise vanished. Each of the computer, the kx3, px3, external power supply, external antenna tuner are all grounded to a common point. The exception is the monitor and fan (it's going to be hot :-). I connected the same setup using a raspberry pi instead of the small computer and no noise observed at the tuned frequency. Drat. So, I am thinking of buying a powered USB hub to try and isolate the USB acc1 cable plugged into the PX3. Seems as thought the small computer I was going to use is picking up the internal IF and bringing it back into the PX3, KX3 via the USB acc1 cable. regards, Brian VE3IBW On Thu, Jun 23, 2016 at 10:58 AM, Sanger, Joseph <joseph.san...@nyumc.org> wrote: > I have developed a new problem with my PX3, which has been quietly sitting > in a case for the past 6 months. > > Whenever I tune across the display, there is a slowly rising spike at the > base frequency (for instance, in USB mode this spike adheres to the left > hand edge of the bandpass indicator on PX3 screeen), takes about 2-3 > seconds or so to increase in intensity, and then dwarfs any of the signals > on the band. This spike tracks across as I tune; it is there whether or > not the antenna is connected. I can tune to stations and hear them fine, > but the display is barely usable because of this very tall spike that won't > go away. I reseated my cables connecting the PX3 to KX3, with no change in > behavior. I have no other cables here to swap them out, and am kind of > stuck > > I have updated b both KX3 and PX3 to latest firmware, with no change in > behavior. > > Any thoughts would be GREATLY appreciated. > > --Joe > --WB2SSB > > Joseph J. Sanger, M.D. > Associate Professor of Radiology > Director, Radiology Informatics > > 462 1st Ave.- OBH C&D 1st fl. Rm 7 > New York, NY. 10016 > > Phone: (212) 263-3434 > > > > ------------------------------------------------------------ > This email message, including any attachments, is for the sole use of the > intended recipient(s) and may contain information that is proprietary, > confidential, and exempt from disclosure under applicable law. Any > unauthorized review, use, disclosure, or distribution is prohibited. If you > have received this email in error please notify the sender by return email > and delete the original message. Please note, the recipient should check > this email and any attachments for the presence of viruses. The > organization accepts no liability for any damage caused by any virus > transmitted by this email. > ================================= > ______________________________________________________________ > 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 > Message delivered to brian.waterwo...@gmail.com > ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
