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: [email protected] > To: [email protected] > 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 > [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 > > > Sent from my BlackBerry > ______________________________________________________________ > 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 ______________________________________________________________ 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
