Uniden UBC780XLT - Manual (Page 64)

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Disconnect Tone Detect Option (End Code)
When this function is disabled, the radio looks for squelch before returning to the control
channel instead of waiting for the disconnect tone. Only in rare instances will you need to
adjust the default settings.
The condition to return to control channels depends on whether the signal is present or not.
To set this function on/off, enter TRUNK DATA - BANK NO. - END CODE.