I thought the answer was to run the KPA by going up to 12 or 15 watts. What is the LPA running when when the power is at 12 or 15 watts? What is it running when the power is at 20 or 25 watts?
Chuck Jack Hawley KE9UW Sent from my iPhone, cjack > On Nov 21, 2019, at 10:32 PM, Bob McGraw K4TAX <[email protected]> wrote: > > I learned my lesson running 12 to 15 watts or so having to replace the KPA3A > twice. I now run 20 to 25 watts driving my KPA500 to rated output. Be it > CW, SSB or digital modes. Otherwise it is 100 watts when not running the > KPA500. Running conservative power doesn't get it. > > Bob, K4TAX > > > Sent from my iPhone > >> On Nov 21, 2019, at 9:15 PM, Dennis Ashworth <[email protected]> >> 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 <[email protected]> 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:[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: >> ______________________________________________________________ >> 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] ______________________________________________________________ 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]
