Icom IC-746PRO Manual page 56

• Toggles between the call channel and normal operation when pushed
momentarily.
• It's convenient to program a most-often-used frequency into the call
channel for quick recall. As with memory channels, the call channel
can also hold split frequencies.
– By default 145.00000 MHz/FM is programmed into the call channel.
• IMPORTANT!: When the call channel is selected with the [CALL] switch,
the frequency CANNOT be changed using the tuning dial, band keys or
keypad input. However, when the call channel is selected using [M-CH] in
memory mode, the frequency CAN be changed.
Call