Frank,
As far as I know, there is not an official way to adjust RV1.? It is a drive setting that I have used to set the output of the PA to a value that is about 12 Watts on 80 meters in CW mode with 13.8 volts supplied.? I have not tried to push the finals beyond that point with 13.8 volts.? Even so, RV1 tends to be close to the maximum level (fully counter-clockwise) to get that value. It seems that it was more a way to reduce power than adjusting to a point where later stages are overdriven.?
One of these days I will get around to measuring the effect on output purity.? So far have not had any issues with the above setting process.? I have tested my rigs for harmonic and spurious.? I have not tested for linearity other than from signal reports and monitoring with my other rigs.
73
Evan
AC9TU
