UHF Backup Radio in BMS 4 33
When the CNI sw is in Backup and the Function sw is in MAN, you can dial in the tower freq and communicate with them as normal. On a Block 40, in order to dial in a freq beginning with '3', like Osan Twr, 308.8, you have to put the first rotary knob to 'A", then set the others to 0-8-.8. That will give 308.8 showing on the dials.
When the CNI sw is in Backup and the Function sw is in MAN, you can dial in the tower freq and communicate with them as normal. On a Block 40, in order to dial in a freq beginning with '3', like Osan Twr, 308.8, you have to put the first rotary knob to 'A", then set the others to 0-8-.8. That will give 308.8 showing on the dials.