It is a weak signal mode, not necessarily a low power mode. If a station you need for new country is -24 and is running 1500 watts then most likely he will not hear you at low power. You will need to run QRO.
Use the power needed to make the contact. Dave wo2x Sent from my waxed string and tin cans. > On Jun 4, 2022, at 9:54 AM, Kevin Robertson via Elecraft > <elecraft@mailman.qth.net> wrote: > > FT8 is a weak signal mode, designed for low power. Given its high duty > cycle, you are asking for trouble if you operate your power amplifier in FT8 > mode using your KPA1500 at anywhere near high power. I burned out my final on > my K2 at 15 watts on FT8. > > 73, > Kevin Robertson KD2WCY > > >> On Jun 4, 2022, at 12:42 AM, Rick NK7I <rick.n...@gmail.com> wrote: >> >> Yes, the KPA1500 will drop 10% of the output, as it warms up. 1500 drops to >> 1350, so you have to compensate with the drive. >> >> I'm told this is typical of all solid state finals (my KPA500 did likewise). >> >> If you're running the station remotely; bump up the fan speed to slow the >> drop (or wear cans). >> >> 73, >> Rick NK7I >> >>>> On 6/3/2022 9:22 PM, David F. Reed wrote: >>> I note my KPA1500 drops power at its temperature rises... >>> >>> Using FT8, so a relatively high duty cycle. >>> >>> Say I start at a heat sink temperature of 27 C, and 1,000 watts out; by the >>> time the temperature is at 65 C, the power has dropped to 893 watts out. >>> >>> I have a couple of questions about this (not a complaint by the way): >>> >>> 1. Does anyone else experience this? >>> 2. Is it normal? >>> >> ______________________________________________________________ >> 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 kevin_robert...@me.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 rocke...@gmail.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
