Auto power reduction happens at 63 C. But it may very well have gone down to 55 C awhile after dropping to 5 W.
Wayne N6KR ---- http://www.elecraft.com > On Jun 18, 2017, at 4:38 PM, Ron D'Eau Claire <r...@cobi.biz> wrote: > > Sri, I meant the temp was 55C, not 45C after the automatic power reduction > kicked in. > > 73 Ron AC7AC > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ron D'Eau Claire > Sent: Sunday, June 18, 2017 4:28 PM > To: 'Irma & Linas(LY2H)'; elecraft@mailman.qth.net > Subject: Re: [Elecraft] KX2 heatsink > > Fired up my "stock from the factory" KX2 into a dummy load at 10 watts, key > down, and it dropped to 5 watts after 4 minutes running from a 13.8 vdc > supply. PA temp was about 45C. > > Hope that helps with your analysis. > > 73, Ron AC7AC > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Irma & Linas(LY2H) > Sent: Sunday, June 18, 2017 2:33 PM > To: elecraft@mailman.qth.net > Subject: [Elecraft] KX2 heatsink > > Hello folks, > I am looking for the practical , empyrical, real info based on the > individual measurements of the maximum Key-down time/temperature at the 10w > output of the KX2 before it drops down to 5 W issuing a message of "HI > TEMP". I would also like to learn about comparison of the KX2 stock heatsink > vs the Pro-audio Engineering KX22 product. > > The reason is that I have decided to install the KX22 on my KX2 ( # 148*) > after a short dx-pedition to Aland islands in May. I was handling quite a > pile-up from the hotel room and after some 5 min of intensive CQ-ing and > answering on CW the PA temperature gone up to 59-60C degrees and the power > dropped down to 5 W and it was frustrating :) Today I have installed the PAE > KX22 heatsink. The key-down at 10 W into a dummy load in CW mode lasted for > around 3 minutes starting from the ambient temp. 27C. I don't think this is > very impressive baring in mind the Pro-audio's claim of the 250% key-down > time improvement. Unfortunately, I was not so smart to test the key-down > time with the stock heatsink before I changed it to the new one, :) But I > remember Wayne was posting here in the previous thread something abt 7 min > of key-down at 10W... So, with the 250% improvement with the KX22 it should > last... for some 24 min?! in my case, It doesn't sound very realistic , > neither 7 min with the stock heatsink, nor 24 min with the Pro-Audio ( maybe > ,bad thermal contact, not enough of grease?). That's why it would be very > interesting to compare the real-life empyrical data of the other KX2 > owners. > > 73! Linas LY2H > ______________________________________________________________ > 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 r...@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 r...@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 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
