I just completed building my new KXPA100 and have connected the amplifier to my new KX3 using the control cable. I have also ensured that I have the latest production firmware on both the KX3 and the KXPA100. Everything seems to operate correctly with the following exception. The output from the KXPA as observed on the KXPA Utility agrees closely with the selected output on the KX3 only for power settings under 75 watts. For power settings above 75 watts, the KXPA output lags the selected output and never exceeds 80 watts even when the KX3 selected power is 100 watts or more. The LED’s on the KXPA support these readings since the highest LED reading is 80 even when the selected power is 100 watts or more. The RF Output displayed on the KX3 matches the selected output level at all power levels. These readings were taken while transmitting into a dummy load with an SWR reading of 1.1 on the Utility. The supply voltage to the KXPA displayed on the Utility at full power was 13.3 volts. I have performed the KX3 Power Output Display Calibration procedure in the KXPA100 manual several times, but this has not corrected the power issue. The Power Output Display Calibration procedure seemed to perform properly as described in the manual. However, after performing this procedure, I continue to observe ALC Ax.x on the KX3 TX GAIN menu rather than ALC tx.x as mentioned in the manual at various power levels from 10 watts to 100 watts. It appears that the KX3 is not saving the new drive levels. I have submitted this issue to Elecraft support, but we have not yet diagnosed the problem. I would appreciate any suggestions as to what might be causing this problem and what I can do to correct the issue. 73, David K5ADL ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net
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