Hi All, Just got a '520S in good shape. All seems well except no RX on 20m. Other than checking for LO/mix xtal output are there any known places to start? Main tuning knob on the '520S is quite solid in feel, but spins much more freely than same on nearby '830S. Is this typical or do I need to lube and/or adjust bearings on '830S shaft and gears? tnx es 73, -- Steve KL7JT/1