Since you are running KPA500 along with the KAT500 and you stated you don't have a balun, I assume you don't have a common mode choke either.
I suggest a trip to http://audiosystemsgroup.com/RFI-Ham.pdf as I suspect you have RF in the shack. 73 jim ab3cv On Thu, Feb 4, 2016 at 7:11 PM, Wes (N7WS) <w...@triconet.org> wrote: > After a good tune, I would use the KAT500 utility to examine and record > the selected component values. > > When the failure occurs, before retuning I would look at them again and > see if they are the same. > > Also after a good tune, I would run up and down the band to cycle the > relays and see if things are the same when returning to a previously tuned > band segment. > > On 2/4/2016 2:17 PM, Bill wrote: > >> For the past month I have been experiencing tuning problems with the >> KAT500. >> >> The antenna in question is a simple 75 meter dipole fed with coax. You >> tune the antenna at 3922, 2955 and 3975 - just for example. When you return >> to those frequencies, a few hours later, the tuning is all off and the >> KPA500 demos its displeasure by beeping and flashing lights. Retuning will >> again hold for a few hours, then all goes haywire again. >> >> I have given shake test to the antenna/halyards - with an analog SWR >> bridge in line - and see nothing to indicate breaks or damage. I replaced >> the feed line and it still does everything the same. All coax lines inside >> have also been changed out - to no avail. >> >> I should mention that this problem exists on an alternate antenna also. >> The alternate is also a dipole type. No remote baluns, nothing other than >> simple center insulators. Chances are they are built properly - been doing >> it for over 55 years and have never experienced anything like this. >> >> I have reset the KAT500 to default a couple of times - reinstalled the >> software - all the things you do with black boxes - went through the >> training thing. I spoken with Elecraft and followed their instructions to >> the letter also (which were the same as what I had been doing). It all >> holds well for a few hours, then goes wacko. >> >> If I have to push the buttons every time I QSY, there is little reason to >> continuing using the KAT500. Of course that makes using the KPA500 more >> difficult or impossible. >> >> Shipping is expensive and so are service charges - the tuner is way out >> of warranty. >> >> Anyone have experiences such as these or suggestions? >> >> I am seriously considering regressing to a manual tuner. >> >> Thanks, >> >> Bill W2BLC K-Line >> >> >> >> ______________________________________________________________ >> 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 w...@triconet.org >> >> > ______________________________________________________________ > 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 j...@jtmiller.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
