I noticed the LPA was getting quite hot when running wspr at 5w for days at time--even with 15% tx cycle. My workaround is a six-inch computer fan set vertical on the right side of the k3, blowing quiet air on the right side and bottom of the k3. It seems to work. I also have used a tiny 2" squirrel-cage fan blowing air under the XV144 during high duty-cycle modes in WSJT. The five high-volume fans I run on the Henry 2002A, to keep from blowing tubes, on the other hand, are a freight-train-in-a-shack (TM).
73, Eric WD6DBM 73 Eric WD6DBM On Thu, Nov 21, 2019, 7:20 PM Dennis Ashworth <dennisashwort...@gmail.com> wrote: > Makes you wonder how K3/10 users fair running high duty cycle modes at > full output. I’ve replaced two sets of LPF drivers running 10W WSJT on my > K3/100. No more! Now I advance the power until the amplifier engages > (~12W). Hopefully this reduces driver dissipation. > > Dennis, K7FL > > > > On Nov 21, 2019, at 5:15 PM, dgb <n...@bayland.net> wrote: > > > > Thanks for the good info Keith - I quit using 12w yrs ago as one > E'craft tech told me after the 1st one blew. > > > > Also heard from another that I could turn the fans on all the time which > should help as normally they are only on when you go to 13w and up. > > > > Will play with them - t u 73 Dwight NS9I > > > >>> On 11/21/2019 4:04 PM, Keith Trinity WE6R wrote: > >> You can play with the Config Menu watt meter calibration high and low > numbers to get the switch-over point different. > >> IE where the Low power amp (LPA) switches to 100 amp (KPA3). This > happens at 12W "indicated". > >> The two Calibration numbers are for all bands! > >> So; Go into config menu WMTR LP (below 12W) or HP (above 12W). (note 6 > meters switches at 8W)! > >> Make a note of both numbers so you can put them back! > >> Extreme numbers to get the KPA3 to click in at lower actual power > levels would be to set both for 180 (max). > >> You will have to use an external watt-meter to see what is going on as > the K3 internal watt-meter readout is all out of calibration now!! > >> I just played with a radio and it switches over at about 7 watts with > both numbers at 180 > >> Have fun! > >> Keith WE6R > >> ______________________________________________________________ > >> 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 > >> Message delivered to n...@bayland.net > > ______________________________________________________________ > > 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: > ______________________________________________________________ > 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 > Message delivered to norrislawfi...@gmail.com ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
