Hi Joe, Have you checked for a voltage drop from your power supply/source? or the APPs? This sounds unusual...
My K3 barely gets warm running RTTY at 100 watts or on 160 running 100 watts for 12 to 14 hours straight. I mention 160 as I have a higher current draw here, most likely due to less than perfect matching at the Tx antenna and proximity to the radio (is VERY close). The only reason I know the fan is on is because I, out of curiosity, put my hand on the rig and feel a bit of air flow... My shack can get to 80 degrees before I decide I need the air on, even then the fan rarely ramps higher than one... Much better than the KPA100 was/is in the same situation. Different setup and much smaller fan on that one. 73, Julius Joe Planisky wrote: > > Apparently not all K3s are created equal, thermally speaking. > > On my K3, it takes about 2:45 of 20 wpm CW at 50 watts into a dummy > load to raise the PA temp from 18C to 37C (the fan turn-on temp. > Ambient temp is about 18C.) > > 73 > -- > Joe KB8AP > > > On May 13, 2009, at 6:24 AM, Ed Muns wrote: > >> You're doing what?! >> >> For two years I've run my K3s in NAQP at 100 watts with high duty >> cycle. The fans seldom turn-on and the PA is barely warm. If you >> can out-design N6KR, I'd be amazed. >> >> Ed - W0YK >> >> >> ------Original Message------ >> From: Brian Binkley >> Sender: elecraft-boun...@mailman.qth.net >> To: elecraft@mailman.qth.net >> Sent: May 13, 2009 05:11 >> Subject: [Elecraft] K3 KPA3 Fan Upgrade Question >> >> Hello, >> >> I am currently in the process of upgrading the fans for the KPA3 100 >> Watt >> Amplifier module because the heatsink temperature gets too high for my >> liking. I am upgrading both fans to a fan with higher CFM output. >> Last night >> I hooked both fans up to the KPAIO module to test and see if they >> will work. >> When I am on fan power level one, the fans try to but are unable to >> start >> up. I have to bump them to start them spinning. Power level two has no >> problem spinning them up. When I went to power level four and then >> brought >> the power level to one, the fans did not have any problem continuing >> running. The fan specs can be found here >> http://www.sundialmicro.com/ipcqueen_dc_fan_606010_ball_bearing_3pin_2033_1199.html >> >> . >> Is there any components that I can add in line to provide the >> necessary >> power to start the fans up at power level one? >> >> >> Thanks >> Brian Binkley >> KD8CPF >> kd8...@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 >> >> >> Sent from my BlackBerry >> ______________________________________________________________ >> 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 > > ______________________________________________________________ > 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 > > ----- Julius Fazekas N2WN Tennessee Contest Group http://www.k4ro.net/tcg/index.html Tennessee QSO Party http://www.tnqp.org/ Elecraft K2/100 #4455 Elecraft K3/100 #366 Elecraft K3 #1875 -- View this message in context: http://n2.nabble.com/K3-KPA3-Fan-Upgrade-Question-tp2883346p2890122.html Sent from the Elecraft mailing list archive at Nabble.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
