Hi Levent,
what you discovered is not a secret cheat. Clicking on the encoder and immediately turning clockwise will bring the cursor left and can be used to change frequency.
Using a band below your original band is ok and works. I don't see a need for additional filters as harmonics of 30 m will not affect other bands and end up in the LPF for the 20 m band. Using a higher band will not work as the LPF will not let the signal pass.
Martin
DK3UW
