a=1880000000,b=1900000000,d=DECT
a=162930000,b=162970000,d=PMV AFSK
a=433050000,b=434790000,d=ISM 433
a=868000000,b=868200000,d=ISM 868
a=1574920000,b=1575920000,d=GPS L1
a=1226600000,b=1228600000,d=GPS L2