What about the power for the KX3? If the voltage to the KX3 is insufficient, or has failed completely and you are running off internal batteries, then you may not be able to develop full power out. Check also the attenuator setting on the back of the KXPA100.
After eliminating the obvious simple cases, contacting Elecraft support is a good move, so they can help determine if it may be something more serious (like a failed final transistor). 73, Matt VK2RQ > On 15 Jun 2014, at 12:55 pm, WA7SPY <wa7...@comcast.net> wrote: > > My KXPA100 has been working great since I purchased and assembled it about 4 > months ago with my KX3. The KXPA 100 has been putting out 100 watts or so on > all the bands. I am using a Carolina Windom antenna by Radio Works which also > has been working great! > > Last night all of a sudden my output from the KXPA100 is half of what it > should be. I can only get 50 - 60 watts output. I connected my KXPA100 to two > different dummy loads. One a Bird 100 watt 50 ohm dummy load and the other a > MFJ 300 watt 50 Ohm dummy load. I can only get 50 watts or so output with 110 > watts selected on my KX3 into either dummy loads using a Daiwa CN-101L SWR > watt meter with eitehr ANT 1 or Ant 2. Yes I have tried several different > coax jumper cables with the same result. I have the 100 watt antenna tuner > installed into the KXPA100. The LED's on the KXPA100 indicate the same 50 > watt output. Yes my voltage to the KXPA100 is good 13.8 volts with a very > short run from my Alinco DM-330MV power supply with only less than 1/2 a volt > drop to the KXPA100. > > I did a reload of the firmware to both the KX3 and KXPA100 with versions KX3 > 0.194 and KXPA100 0.132. I did get the following message from the KX3: > Loaded MCU revision 0.194.KX3 responded with version 99.99. > > I will be calling Elecraft Support on Tuesday morning which is one of my days > off from work. Any suggestions in the mean time? > > Thanks, > Glenn WA7SPY > ______________________________________________________________ > 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 matt.vk...@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
