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 -----Original Message----- From: Don Wilhelm [mailto:w3...@embarqmail.com] Sent: 25 June 2010 22:50 To: GD0TEP Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] PA set up issues Andy, I would first do the wattmeter calibration as indicated in the manual. You can make it match your Bird if that is what you trust. After that use K3 Utility to do the 5 and 50 watt (and 1 mW if you have the KXV3). Using the K3 Utility to do the TX Gain calibration is a snap, you just sit back and watch it change bands and 'do its thing'. Re-check your conditions after those steps. 73, Don W3FPR GD0TEP wrote: > Hi to the group, > > > > I've just installed my KPA3 100w upgrade into my factory built K3. > > > > I've followed the calibration procedure starting out with 5w per band, > and then moved to 50w per band, as per instructions. > > > > I must be missing something, or perhaps not understand what I'm > reading as once I've completed the calibration, some of the HF bands > are fine with 100w out, other bands seem to upset the radio as > follows: When using the radio into a 200w 50 ohm load, and measuring > power with a bird 43, I can see how the power increases as I raise the > power output, yet on certain bands there seems to be a point where at > around 85w to 90w the power out appears to fold back and the radio switches itself off. > > > > There doesn't seem to be any link to what band is causing the problem, > as I have the problem on 160m, 30m 21m 12m, 10m and 6m. > > > > So, what am I missing, or perhaps I should ask 'what have I done wrong > or forgotten to do'?? > > > ______________________________________________________________ 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
