Just got this radio. Trying to get it on 27.570.0 on USB but it won't. I do a lot of international QSO's It will on LSB but not USB. The best I can get out of it on USB is 27.571.5 I need just a tad bit more slide. Anyone know if there a mod to get a few more KC's out of it? Thanks in advance. Photo showing the frequency with the course turned fully counterclockwise.