Could it be overheating? Or is the temperature calibration is out of whack.
Joe, KO8V > On Aug 1, 2019, at 10:16, Richard Hoffman, K1DJ via Elecraft > <[email protected]> wrote: > > Rig: K3S (100W with internal ATU), s/n 11064, P3, KPA500, KAT500, into > SteppIR 3-el with 30/40 loop or wire dipoles/inverted-V's. > > Problem: My K3S 100 watt internal amplifier unit (K3S/100) has become > intermittent. > > It first happened yesterday while I was running 100W on FT-8. [I have done > this hundreds of times, sometimes for lengthy periods, over the past 18 > months with no problems.] > Suddenly, my power output dropped to zero, and my received signals audio and > P3 display also suddenly went quiet. > > After some fiddling around, I figured out that if I reduced the K3S power to > 10-12 watts, both transmit and receive came on again — leading me to conclude > that it must be my 100W amp unit that had dropped out. > > I rebooted the rig and the 100W internal amp unit kicked back on. So I was > hoping I had just triggered a protective circuit which had reset. The rig > worked fine at 100W for a subsequent hour-long multi-band CWOPs CWT CW > session at 100W. Then, however, a few minutes into the next CWT session > hours later, the same thing happened again. Power output suddenly dropped > from 100W to 0, and received audio and a P-3 screen filled with many medium > to strong CWOPs signals simultaneously went quiet. > > I reduced the power on the K3S down to 10W, and both transmit and receive > worked again, but only at low power. > Please pass along any helpful suggestions, and thanks! > Richard Hoffman (Rich), K1DJScituate, MA ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
