Don, Thanks for the tip -- that was exactly it. I checked and replaced D16 and D17 and all is well now. (Both were showing the same voltage drop in both directions.) I gather from your description that the built-in wattmeter forms a negative feedback loop with the power adjustment.
My diodes and I are definitely static-challenged -- I have had a similar problem at least twice in the KAT100 despite my best efforts to remember to disconnect the antenna after operating. 73 Jonathan K1RFD On Fri, Jan 3, 2020 at 10:44 AM Don Wilhelm <[email protected]> wrote: > > Jonathan, > > The normal cause of that HiCur message is a failure in the wattmeter of > the KPA100. Re-alignment will not help. > > To test for that possibility set the power knob for about 50 watts, > connect an external wattmeter and a dummy load. Then go Keydown and see > what the actual power output is. If it is in excess of 100 watts, then > that is proof that the KPA100 wattmeter has a problem. > > The most common cause is that the diodes D16 and D17 have been damaged > by static from the feedline, so replacing D16 and D17 is the first step > in attempting to correct the problem. Check again for actual power > output with the power set for 50 watts after replacing those diodes. > > If you still have a problem after replacing those diodes, I can help > with further troubleshooting. > > 73, > Don W3FPR > > On 1/3/2020 9:15 AM, Jonathan Taylor, K1RFD wrote: > > K2 #2462 > > > > I just upgraded the KPA100 from Rev A to Rev D, and installed the > > upgraded shield, under the philosophy of "better late than never" :) > > > > I am noticing two problems, when connected to a 50-ohm dummy load: > > > > 1) In TUNE, the display briefly shows "Hi Cur", followed by a strange > > power/SWR indication such as "7 5.0-1" > > 2) At any setting above 10W, the Power knob seems to have no effect -- > > the wattmeter always reads approximately 100W output. This is true > > both in TUNE and in CW. > > > > The actual power output appears to be about 100W, when measured with > > an external wattmeter (although a bit low on 10M). > > ______________________________________________________________ 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 Message delivered to [email protected]
