As Vic said take a look at Allard's code. I use v1.26.
With a ten turn pot you can set the TUNING_POT_SPAN to 300 to tune the whole band without jumping. Also set MIN_FREQ to 7000000UL, MAX_FREQ to 7300000UL, and START_FREQ to 7200000UL(or a freq of your choice).
