RE: P40 Doppler speed reading please?
I'm not sure how you know when the level flight begins. When I look at the wave file, I look for a flat spot on each end to do my measurement. I'm sure that the mic being off to the side of the flight path takes away from the accuracy as well. Ideally, the plane would fly directly at the mic and directly away. That way the curve in the center would be very short instead of a long slide.