[Elecraft] New KPA 500 Questions: Idle HV and Info button

[Andy Durbin]

1) At 120V using green tap, idle HV is ~87V which is just over the recommended 85 but not enough to trigger a fault.

I don't know if 87 V is OK or not but my unloaded voltage is 79.6 V with mains supply at 120.4 V.  That gives 63 V at 10 A.   PA voltage will vary with current and current depends on efficiency which will vary with frequency and quality of antenna match. 

e.g.

             TX freq = 1840500 Hz
              PA voltage = 63.7 V
              PA current = 10.2 A
              PA input = 649 W
              Drv pwr = 027 W
              RF out = 517 W
              PA diss = 132 W
              PA effic = 79%



2) Also, I found no reference in searches or manual for the INFO button.  Looks like it's not being used for anything.

I press INFO to clear any fault that may have tripped.  I initially expected it to display more info on the fault but it doesn't. 

73,
Andy, k3wyc