This is related to set_freq and get_freq functions, which i had to copy from ft7800.py file, and extend them to support more fractional frequencies.
I think that the same functions could be used for ft7800 model (and derived), but i didn't want to break all of them at once. So once i chceck that other "bits" are not used on FT-xx00 radios I will produce another patch, that cleans up the code.
Plus there is the 0x10 bit not implemented and could mean another "fraction" - used or unused by other radios. I might even try how my ftm350 reacts to that.