The KX3 and KX2 max heat sink temperature is 63 C. At that point power is automatically dropped to 5 W. If it reaches the max temp again, transmit is exited.
Wayne N6KR > On Aug 6, 2017, at 10:27 AM, Jim Brown <j...@audiosystemsgroup.com> wrote: > > A well designed output stage SHOULD be hot to the touch. The temperature > component of protection in Elecraft output stages seems to kick in when the > internal temperature approaches 70 deg C. You can see this, for example, by > watching temperature in the KPA500 and listening to fan speed. The function > of the heat sink is to act as a conductor between the semiconductor junctions > and the surrounding environment, and increased mass acts as a sort of buffer. > > 73, Jim K9YC > > On 8/5/2017 2:53 PM, Jan wrote: >> ""I've been doing a lot of FT-8 using my KX3 and my KXPA100 at 20 watts, >> and have noticed that the KX3 is heating up quite a bit and is almost >> hot to the touch"" >> >> Why should the KX3 be heating up, when the AMP is running only 20W ? >> Is the KX3 "drive" not backed-down at this level ?? HELP > > > ______________________________________________________________ > 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...@elecraft.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