An interference free multi-vehicular repeater system

One method to ensure that a public safety officer remains in contact with his dispatcher is for each officer to carry a portable radio and have a repeater in his vehicule to compensate for the low power of the portable. In the past the use of vehicular repeaters in more than one vehicle has been prohibited by interference caused by multi-unit key up. The PAC RT vehicular repeater described in this paper prevents multi-unit key up by assigning a priority to each repeater and permitting only "priority units" to repeat.