Hi Pete, It sounds like a hardware problem in the low pass filter module. Contact Elecraft customer support.
73, Bob, N6CM On Tue, Dec 11, 2012 at 10:11 AM, Pete Lascell <plasc...@verizon.net> wrote: > Operating my K3 on 6 meters with the KPA500 ( S/N 1009 ) is new ground for > me. > > The amp has been performing on lower HF frequencies with expected results, > but on 50 MHz the power output into a dummy load is questionable. If I try > to tune with CW carrier (XMIT putton) , I can only get about 200-250 watts > before the amp "faults" and shows PA DISS. The HV is about 60 volts and > current 14 amps with 24 watts drive for 250 watt ouput level before "fault". > > If I key CW dots or dashes, then I can increase the drive to 40 watts for > 450 watts output into dummy load with 1:1 SWR. > > HV unkeyed is 75VDC, operating on 120 VAC. (Don't remember where the > transformer tap is) > > Specs seem to indicate the RF output should not degrade on 50 MHz and is > rated for 500 watts PEP CW / SSB / DATA. Can I assume I should be able to > get 500 watts RTTY carrier for 15 seconds ? I get a "fault" within half a > second if driving it for power out levels higher than 250 watts. My TEMP > has never gone above 60 C. > > Am I doing something wrong? > > Do I have a hardware failure? > > What should I expect to be normal operation on 6 meters? > > > Pete W4WWQ > ______________________________________________________________ > 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 > ______________________________________________________________ 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
