Hi Dick, By 'not working' I presume you mean that advancing the TX Power control above 12 watts does not yield increasing TX power output?
Does advancing the TX Power control above 12 watts produce any increased TX output power or none at all? Here I presume you have an external wattmeter with which to measure TX output power. The K3s uses the KPA3A power amplifier, which is a RF MOSFET-based amplifier. The 100 watt amplifier is either bypassed or inserted inline after the KLPA3A low power amplifier using PIN diode switches and depending on the setting of the TX Power control. That you're still able to measure 12 watts TX output from the KLP3A suggests the 'bypass' path through the PIN diode switches is operating correctly. Keith, WE6R, the Elecraft tech guru, had posted some common failures on the KPA3A board - you can search them on this forum or the K3 groups.io forum. He may chime in here before I can locate his very helpful posts. 73, Mike, K8CN ______________________________________________________________ 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
