[Elecraft] New KPA500/KAT500 with my "old K3)

[WILLIAM DAVIS]

I recently finished up my KPA500 and it is a treat!  I was astonished when my first CQ call on 40m was answered by a station in Slovenia!  No fancy antenna, just a G5RV at about 50' running due N & S, to get E/W lobes.

Only one thing I can't figure out and I haven't been able to find in the documentation - P10 of the KPA500 operating manual mentions using the AUX cable between the amp and the K3 and that doing so will allow the user to set two per-band power levels at the K3 - one to drive the KPA500 when it's in OPER mode and another when in STBY.  I'd like to set K3 power to about 20 W for OPER and about 50 W  for STBY.  I have the cable connected properly (daisy chained through the KAT500).  When I switch the KPA500 from OPER to STBY and vice versa, the K3 so indicates via a message in the VFO B area, so I think the K3 knows what's going on.

However, for the life of me I can't seem to make the K3 power level change with the OPER / STBY mode change.  The K3 power level seems to remain on the last one set, irrespective of which mode the KPA500 is in.  So, if I put the amp in OPER and set the K3 power to 20 watts, then switch to STBY, the power stays at 20 watts.  Then, while still in STBY, I change the K3 power to 50 watts and switch the KPA500 to OPER, the K3 power seems to remain at 50 watts.  No way i want to drive the amp with 50 watts!

What am I doing wrong?  Is there a setting somewhere that needs to be toggled?

Puzzled.

Bruce
AC8BT