EME boys fave a lot of patb loss and their Yagis point to the moon. For terrestrial worm, the path loss is generally much lower and especially when there are othdf local hams or good propagation the signal levels can be high. This often leads to excessively wide signals on different audio frequencies.
Sent from my Samsung Galaxy smartphone. -------- Original message --------From: "Dave Cole (NK7Z)" <d...@nk7z.net> Date: 17/07/2018 15:30 (GMT+00:00) To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA500 thermal clicks yes... Weak Signal, not low power. The EME boys use 1 KW. 73s and thanks, Dave NK7Z https://www.nk7z.net On 07/17/2018 07:15 AM, turnbull wrote: > I thought FT8 was a low power mode. Am I wrong? I am not referring to Fox > Hound mode. > 73 DOUG EI2CN > > > Sent from my Samsung Galaxy smartphone. > -------- Original message --------From: Michael Blake via Elecraft > <elecraft@mailman.qth.net> Date: 17/07/2018 14:12 (GMT+00:00) To: Nr4c > <n...@widomaker.com> Cc: Elecraft Reflector <elecraft@mailman.qth.net>, ANDY > DURBIN <a.dur...@msn.com> Subject: Re: [Elecraft] KPA500 thermal clicks > While possibly my imagination, after a few months of use I loosened all of > the Z bracket to heatsink screws and side panel to heatsink screws and then > retightened all of them plus the top cover to Z bracket screws. That seemed > to reduce the clicking. > > Very 73 - Mike - K9JRI > > > > >> On Jul 17, 2018, at 9:05 AM, Nr4c <n...@widomaker.com> wrote: >> >> “Clicks” caused by the “Z” bracket are well documented and normal. >> Personally, I don’t find this “intolerable” or even slightly annoying. My >> wall clock “ticks” every second. >> >> Sent from my iPhone >> ...nr4c. bill >> >> >>> On Jul 17, 2018, at 7:56 AM, ANDY DURBIN <a.dur...@msn.com> wrote: >>> >>> The clicking of my KPA500 is almost intolerable and I'd like to know if >>> what I'm experiencing is typical. >>> >>> >>> In an FT8 TX/RX cycle with output power 126 W my KPA500 clicks 7-8 times >>> during 15 second transmit and 7-8 times during 15 second receive. In these >>> TX/RX cycles my logger shows the finals temperature swings between 57 deg C >>> and 63 deg C. During this test the KPA500 was seeing an SWR of 1.02:1 >>> and calculated PA dissipation was 307 W. >>> >>> >>> I don't think this temperature swing is likely to cause the heat sink to >>> expand and contract significantly. The thermal mass of the heat sink is >>> quite large and the heating and cooling periods are short. The first >>> click happens almost as soon as the KPA500 is keyed. >>> >>> >>> I think it is possible that the clicks are caused by expansion and >>> contraction of the finals at their mounting points. Is that likely and, >>> if so, why would it be considered normal? >>> >>> >>> 73, >>> >>> Andy k3wyc >>> ______________________________________________________________ >>> 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...@widomaker.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 k9...@mac.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 turnb...@net1.ie > ______________________________________________________________ > 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 d...@nk7z.net > ______________________________________________________________ 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 turnb...@net1.ie ______________________________________________________________ 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
