Motorola TMR 2, User Manual

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For ease of communication in emergency situations, tactical call signs may
be assigned on multi-agency radio networks. The tactical call signs will
describe the radio operator’s location or function.
Example: The Incident Commander at a Dartmouth General Hospital
incident might use the call sign ‘ Dartmouth General Incident
Commander ’.
Calling
Before transmitting, the operator of every station shall listen for a period
long enough to ensure that there will be no harmful interference to
transmissions already in progress. If such interference seems likely, one
must wait for the
fi rst break in transmission where he may intercede. A
station having distress, urgency, or safety communication to transmit is
entitled to interrupt at any time when a transmission of lower priority is in
progress.
Station Call
When a station wishes to establish communication with another station it
must transmit the following items in order:
Name of the station being called
The words ‘THIS IS’
Name of Station calling
Invitation to reply: ‘OVER’
Replying
When a station is ready to receive the communication, it should
reply in the following form:
Name of calling station
The words ‘THIS IS’
Replying Station
The words ‘GO AHEAD’