Tom, Maybe I missed it in your message, but what is the voltage at the input power connector of your KXPA100 when you're attempting to make the calibration runs?
It sounds like you don't have the needed DC voltage AT THE AMP'S DC INPUT APP CONNECTOR to produce full power output. Voltage drop between the PS output connection and the Amp input connection seems to be a common problem in these low power output situations. 73 Ken - K0PP On Apr 16, 2016 22:34, "Tom Field" <docw...@gmail.com> wrote: Thanks for the replies. I have gone through the procedure again. I used the calibration procedure outlined on the Elecraft Website. Some observations. With no load I have 14.63 volts coming into the KXPA 100. With the radio and amplifier on and resting, the current is approx 0.3 Amps Steps Set the radio in the 160 meter band Set P Cal Closed the menu Set Pwr to CAL 75 Confirmed the KXPA 100 Is in bypass Pressed Tune( I assume this is the button that says transmit) Current rose to .9 Amps If I took the pressure off the button, the current stayed up until I pressed it again The display showed 2 numbers On top 1.1 Below 5.0 Pressed the button again Normal Display returned Moved on to 80 meter band Same behaviour and findings Moved to 60 meter band Same 40 meters, 30 meters, 20 meters same with approximately same current 17 meters, Current went up to 1.21 Amps 15 meters 1.24 Amps 12 meters 1.45 Amps 10 meters 1.45 Amps 6 meters Display showed 3 instead of 5 and 1.68 amps Opened the menue and turned the PA to on Set the PA back to auto set power at 75 Watts Using the KXPA Utility Input Power Forward Power 160 m 0.8 48 80 m 1.0 50 60 m 1.2 52 40 m 1.2 51.4 30 m 1.1 56.8 20 m 1.6 59.2 17 m 1.6 82 15 m 1.2 51 12 m 1.0 49.5 10 m 1.2 50.3 6 m 2.0 60.6 The only band that came close was 17 meters. I wonder if there is something about the calibration process. Accd to the notes from the Elecraft website "Press TUNE. The KX3 will transmit for a short while then stop. During this transmission, the KX3 and KXPA100 will determine what drive level is needed to get to 75 watts" I found if I pushed and held TUNE, it started transmitting and did not stop transmitting until I let off and pushed it again. Advice, suggestions welcome. Tom KN6DR On Sat, Apr 16, 2016 at 5:29 PM, Tom Field <docw...@gmail.com> wrote: > I'm having difficulty getting more than about 70 to 80 watts out of the > KXPA 100. I have it connected to a KX3 with the Elecraft cable and have > gone through the calibration procedure as outlined in the owners manual and > in Fred Cady's excellent book. > > For Example if I go through the calibration procedure on 40 meters, > It appears to show a drive level of 5 watts to achieve 75 watt output. > If I transmit into a dummy load, with the power setting at 100 watts, > I have a drive power of about 2.6 watts and an output power of about 70 > watts as shown in the KXPA Utility. > > Am I missing something? > > Tom > KN6DR > ______________________________________________________________ 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 elecraftcov...@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