Uniden uh078sx - Manual (Page 24)

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BUSY CHANNEL LOCK-OUT (BCL)
This feature prevents accidental transmission on a busy channel.
This is recommended on channels where DCS/CTCSS is being used. If the
channel is “active” and the signal is coming from a non or different
DCS/CTCSS code user the BCL feature will prevent you from transmitting.
1. Press five times.
2. Press or to change setting ON/OFF.
BCL appears on the display when set to ON.
3. Press and hold to store setting.
BCL cannot be set on extra receive channels (CH41 to CH100).