Retevis RT628 User Manual page 7

To prevent accidental transmissions and save battery life, the radio
emits a continuous warning tone and stops transmitting if you press
PTT for 180 continuous seconds.
To avoid accidentally changing your radio settings, press and hold
for 3 seconds or until @ displays. You can turn the radio on
and off, adjust the volume, receive, transmit, send a call tone, and
monitor channels. All other functions are locked.
To unlock the radio, press and hold 3) for 3 seconds or until fis
no longer displayed. |
Use scanning to monitor channels for transmissions or to find some-
one in your group who has accidentally changed channels. To start
scanning, briefly press and release =, . The scan indicator =,
displays. When the radio detects channel activity, it stops scanning
and you can hear the transmission. To respond to the transmission,
press PTT within 5 seconds the channel will be confirmed.
If the radio stops scanning on a channel you do not want to listen to,
briefly press and release or to resume scanning for the next active
channel.
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