246 VOR NAVIGATION (IC-A24E ONLY) Duplex operationThe duplex function allows you to call a flight service stationwhile receiving a VOR station. The duplex function requiresfrequency programming for the flight service station in ad-vance.D Programming a duplex frequencyq Push [CLR•DEL ] to select the frequency mode.w Set a NAV band frequency using the tuning dial or keypad.• NAV band frequency range: 108.00–117.975 MHze Push , then push [5•DUP-W].• “DUP” flashes and transmit frequency appears.r Set the frequency of the flight service station using the tun-ing dial or keypad. When using the tuning dial, push [ENT]after setting a frequency.• The displayed frequency returns to the NAV band frequency.D Operating the duplex functionq Set the desired frequency in NAV band.• NAV band frequency range: 108.00–117.975 MHzw Push , then push [6•DUP ] to turn the duplex functionON.• “DUP” appears on the function display.e Push and hold [PTT] to transmit at the pre-programmedtransmit frequency.r Release [PTT] to return to receive.t Push , then push [6•DUP ] to cancel the function.• “DUP” disappears on the function display.NOTE: A duplex frequency can be programmed into eachmemory channel independently. Set a duplex frequencybefore programming the memory channel, if desired. Theduplex ON/OFF setting can also be programmed into amemory channel.EXAMPLE: Programming 123.65 MHz as the transmit frequency in the duplex function.