Scan Transmit Channel: 1 of 3 Toggle Rx CH or Sel CH using the Tab key. Default is Sel CH. Rx CH: (On-hook) - When the radio is receiving a channel, the radio will transmit on that channel. The radio will transmit on the SELECTED channel if not receiving a channel. 2 of 3 (Off-hook) - If the radio is receiving a channel and the microphone comes off-hook the radio will stay on the receive channel and stop scanning. **** Note **** This is only if Off-Hook scan is not enabled. Sel CH: (On-hook) - The radio will always transmit on the SELECTED channel. 3 of 3 (Off-hook) - The radio will revert to the selected channel and stop scanning when the microphone comes off-hook. **** Note **** This is only if Off-Hook scan is not enabled.