Motorola HT 1000 User Manual page 122

Priority Revert Channel
116
This field will be visible only if the Channel Revert field is set to Enabled.
Enter a channel number directly or use the UP/DOWN arrow keys to
specify the number of the channel to be used for emergency
transmission when the Emergency Channel Revert mode is enabled.
The valid range of channels is 1 through the maximum channel allowed
in the radio. Only channels which are marked as "Programmed" in the
CHANNEL CONFIGURATION screen (F4/F4) will be displayed as possible
selections.
The default is 1.