A short story..... I was having awful trouble with my K3 #4113 with power overshoot with band or power change on 40m especially but all bands to some degree. Also max power out on 15m was 85w. 160m unknown since I don't op there.
As you did, I upped the PS voltage and ran a TX Gain Cal and it got better for a while but wasn't a cure. In "fix it or break it" mode, I updated the firmware to latest production version (was on 5.3.8) and reran the TX Gain Cal. Not much improvement. Thinking maybe I did something wrong, I redid the TX Gain Cal and for some reason, while in the K3 utility, ran the 50 watt cal a second time. Totally different gain values in the status listing AND problem cured! No overshoot and full output on 15m. Happy camper. The only thing I can think is that the power of the K3 was taking longer to settle than the cal software allowed giving less than ideal results. OK- long story and I don't know if this will help your problem but it might be worth a try. GL! 73, Brian, K0DTJ > On Dec 17, 2016, at 14:54, John Kaufmann <[email protected]> wrote: > > I had the same issue with my K3S. I was seeing 80W maximum on 160 and it > would not drive my AL1200 to full power (1500W). Redoing the power > calibration did not fix the issue. > > > > Elecraft Tech Support told me that my K3S was within spec but that > increasing the power supply voltage could yield more power output. I ended > up increasing my supply voltage from 13.8 volts to 14.5 volts and was able > to get 90W out, which was a bit of an improvement. There is a trim pot > inside my Astron RS-35M supply that adjusts the output voltage. > > > > 73, John W1FV > > > > > > ------------------------------ > > > > Message: 10 > > Date: Sat, 17 Dec 2016 00:27:48 -0500 > > From: "Gary Smith" <[email protected]> > > To: [email protected] > > Subject: [Elecraft] K3s - 80W on 160 > > Message-ID: <[email protected]> > > Content-Type: text/plain; charset=US-ASCII > > > > I usually don't run barefoot at 100W and > > don't drive my amp with more than around > > 50W. Tonight when I tried running at 100W > > on 160 I was surprised to find it only > > putting out 81W. It puts out incrementally > > till 81W and then even though I can adjust > > the power so it reads 100W on the K3s LCD > > bar and numerical display, the watt meter > > in the P3 and the LP-100A both show the > > wattage stopping at 81W. > > > > With the ATU in or out it gives 81W out on > > 160, SWR is 1.28 > > > > All other bands except 6M give around 98W, > > 6M gives 87W > > > > Any ideas what might be causing the lower > > output on 160? > > > > Thanks & 73, > > > > Gary > > KA1J > > > > ______________________________________________________________ > 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] ______________________________________________________________ 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]
