Hi, >The manual gives a procedure to calibrate the dial using C22 (and a CAL >PLL), however if C22 isn't at exactly 4000.0000 kHz, then the built-in >freq counter will not be accurate. Oddly enough, setting C22 to exactly 3,999,986.7 Hz will provide a more accurate CAL PLL and CAL FIL, at least for the most recent version of the firmware. Wayne's method will get you pretty close to that. 73, Michael, AB9GV