FYI... My KX1 (s/n 13) at 13.8 Volts input, indicates the following output into the Elecraft 50 Ohm Dummy Load. The KX1 power out reading was calibrated according to the method detailed in the manual and agrees with calculations using the Voltage on the DVM 40M - 4.0 W 30M - 4.0 W 20M - 3.5 W Dave KK7SS K2 #3597, KX1 #13