If I set my K3's VFO to WWV at 5.000000 MHz with AM-S on....and I adjust "REF CAL" to a number where my VFO's frequency readout is exact or near this number +/- maybe a Hertz or two. Is this an accurate way to calibrate my K3? It seems to be very accurate as far as I can tell. Has anyone used this method? Michael N2ZDB