The radios seem to be somewhat erratic, none of my Flex radios was spot on, two 3000's and two 5000's and the new 6400m also shows 1.5 to 1 into the dummy load. The Anan's I had were off as well. Software does not control it, firmware might be able to calibrate it. You used to be able to set the power per band to get the Flex radios to 100 watts on all bands but they changed that and you need a digital power/swr meter and its software to do that now I think. Unsure what the Anan radios do for per band power calibration...is it manual adjustment in the software?