Todo: @PE5PVB
1. Can add an menu option
byte showSWMIBand = 1; // Fix Me: Menu options: 0: don't show 1: show up
2. Need to store and restore the last SWMIBandPosold
uint16_t SWMIBandPosold; // Fix Me: Should store this parameter into flash, for use of restart.
When you set stepsize to 4 and then switch to LW Band and turn off radio immediately , when turn on again, then stepsize will remain 4 ,this is not suitable for LW and MW.