Pressing [PF2] allows you to switch the operating band between bands A and B, while maintaining the original band as the transmit band.
Band A is the transmit band and band B is the operating band:
Band A is both the transmit and operating band:
SELECTING Dual band mode/ single band MODE
You can switch the transceiver between dual band operation and single band operation by pressing [BAND SEL] (1s) of your selected band.
Dual band mode:
18