Why not run it at 50 watts and give up the 3db. Probably will not make a difference in number of contacts and your thermal problem should go away. Also what is SWR George, W6GF
On Sunday, July 20, 2014 4:23 PM, Bert via Elecraft <[email protected]> wrote: I used my KX3/KXPA100 in the NAQP RTTY contest this weekend. The KX3 with added-on heat sink worked very well; however, the KXPA100 repeatedly faulted with HI TEMPERATURE indicated on the KX3 at full output after prolonged operating (lots of CQ'ing with short pause intervals). PA.X temp indicated at failure was around 60C...as it should. Shack temperature was around 70 degrees F Yes, I know all about digital modes and full power stressing amplifiers, etc. What I want to know is how to mitigate this interruption yet run full output. To that end, I have a couple ideas: what if I mounted the amp vertically so the heatsink fins "drew" cooler air through themselves via convection? Secondly, would a couple muffin fans mounted atop the cooling fins do the job? The net of this is that I'd like to enjoy the full benefit of having a high-quality 100-Watt amplifier, regardless of mode or key-down time. Bert N4CW/K1IMI ______________________________________________________________ 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]
