All you'd have to have is one ground not making contact until you pushed or checked it. Power ground is an important issue to have exactly right all the time. You can sometimes eliminate some possible paths with separate power supplies for some station gear. W4TV has a list of recommendations for that based on the Microham boxes. He's focusing on ground hum and such, but the principle applies to your situation as well. If you understand the why for W4TV's stuff, you will see how to prevent recurrence of your case.
73, Guy. On Tue, May 15, 2012 at 8:40 AM, Don Wilhelm <[email protected]> wrote: > Mike, > > As Guy suggests, check the ground return between your K2 and the power > supply. Also check the ground path between the computer and the K2. > Make sure all ground paths are intact, > > 73, > Don W3FPR > > On 5/15/2012 8:03 AM, VK1OO wrote: > > Hi Guy, > > > > Thought I would let you (and the reflector lurkers) know the problem is > > solved, but I'm not sure how. > > Not a connector issue - I did one of the mods a while back to prevent > that. > > I did check each of the power leads to the K2, KPA100 etc, but found no > > faults. Subsequently measured the current through the L4 vias as as > > 0.4mA. So perhaps checking each cable scared the fault away. I inserted > > a new L4 and monitored the current for a few days with no observed > > issues. Put the trusty K2 back together and no problems since. So, > > what's the best way to prevent a recurrence of this problem? > > > > Mike > > VK1OO > > > > > ______________________________________________________________ > 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
