Kenwood TM-D710A - Manual (Page 24)

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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: