Paul;  et al;   Here's how to get to the 850 band on a modified 570:

1.  make sure the 2M side of the radio is in VFO mode...
2.  push <BAND> to make 2M the sub-band (440 side is the main band)
3.  push <FUNC> <BAND>...  "SUB" indicator should come on...
4.  push <BAND>...  should see some 350.xxx freq. in the sub-band.
5.  push <BAND>...  should see some 850.xxx freq. in the sub-band.
6.  push <FUNC> <BAND>...  back to "normal" radio mode...
7.  push <BAND> to switch the 850.xxx band to the main band where
    you can play with it..

Ken.    KC4YOZ