Aha... Although I don't see any problems with the PSU I was trying, I moved the K3 over to my shack main PSU, a 72a jobby that is fine when more than one radio is TXing at the same time.
You were of course all correct, the radio is fine so it must have been the original PSU. DOH! All sorted, my thanks to everyone for the response to my original query. 73, Andy http://gd0tep.com -----Original Message----- From: Don Wilhelm [mailto:[email protected]] Sent: 26 June 2010 17:57 To: GD0TEP Cc: [email protected] Subject: Re: [Elecraft] PA set up issues Andy, As Roger suggested, check your power supply - I did not initially realize that the K3 "trips off", I had previously thought that it had reached some maximum power that it would not go above. Check the power cable connections to be certain they are tight both inside and outside the power supply enclosure. If that is not the problem -- Measure the current drawn just below just below the point where the K3 trips off and include that information in an email to [email protected] 73, Don W3FPR Roger D Johnson wrote: > GD0TEP wrote: > >> Hi Don, >> >> Thanks for the info, I downloaded the program and carried out the >> calibration procedure, and yes, it was interesting to watch but >> didn't cure the problem. >> >> Here's the results I get, the power indicated is taken from the KW. I >> start out at 50w, then increase the power heading towards 100w: >> >> 160m - 97w & radio trips, next test found fine adjustment of front >> control made the 100w 80m - 100w Appears OK 40m - 100w Appears OK 30m >> - 100w Appears OK 20m - radio tripped off, next test found that all I >> could get is 85w before it would trip again. >> 17m - 94w & radio trips off, repeated attempts results in the radio >> tripping off @ 85w 15m - 95w & radio trips off, repeated attempts >> results in the radio tripping off @ 94w 12m - 90w & radio trips off, >> repeated attempts results in the radio tripping off @ 88w 10m - 100w >> 6m - 94w & radio trips off, repeated attempts results in the radio >> tripping off @ 86w >> >> So, now what should I try?? >> >> 73, >> Andy >> http://gd0tep.com >> >> >> >> > Hi Andy.... > > I had the same problem originally. It was the power supply current > limiting! Supposedly, a 25 amp supply, it would start limiting at > about 18-20 amps. This dropped the voltage which would cause the radio > to shut itself off. > > 73, Roger > > ______________________________________________________________ > 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
