I imagine that if enough heat can be removed fast enough KPA1500 would run key-down forever at 1500 watts output. That is why fan levels 4 and 5 are so loud, to give those five minutes on (and take five minutes off) without the amplifier overheating and forcing a hard fault. Hard faults force KPA1500 into standby, to protect itself.
If you generate excessive forward power the amp will attenuate the excessive power and warn you with a yellow LED. If you continue to demand excessive power then you will get a hard fault and what sounds like a scream, along with a red LED. This must mean STOP! "Dave, Dave. What are you doing Dave?" 73, Will, wj9b CWops #1085 CWA Advisor levels II and III http://cwops.org/ -------------------------------------------- On Tue, 6/5/18, Walter Underwood <wun...@wunderwood.org> wrote: Subject: Re: [Elecraft] KPA1500 Fan Noise - Not An Issue To: "elecraft@mailman.qth.net" <elecraft@mailman.qth.net> Date: Tuesday, June 5, 2018, 1:01 AM I would recommend reading the specs. As I remember, it is ICAS, five minutes on, five minutes off. But you should check for yourself. wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Jun 4, 2018, at 5:06 PM, Paul Baldock <p...@paulbaldock.com> wrote: > > Can the KPA1500 run brick down 100% duty cycle at 1500W while maintaining the temperature in a safe range? Anybody tried it? > > - Paul > > ______________________________________________________________ > 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 wun...@wunderwood.org ______________________________________________________________ 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 wlba...@bellsouth.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 arch...@mail-archive.com
