Repeater station for augmenting the coverage area of a paging sy

Details Repeater station for augmenting the coverage area of a paging sy Repeater station for augmenting the coverage area of a paging sy

1997-01-16

1999-11-30

Chin, Wellington

Telecommunications

Carrier wave repeater or relay system

Portable or mobile repeater

455 381, 455575, 455 95, 455345, 34082544, H04Q 706

Patent

active

059958049

ABSTRACT:
A low power miniature repeater station is located on a vehicle such as a train, cargo ship, cruise ship or other vehicle which is expected to carry multiple paging receivers. The repeater station receives paging messages that originate as satellite signals and rebroadcasts them in the immediate vicinity of the vessel. The rebroadcast may typically be over a single FM carrier frequency or in the form of a subcarrier signal. The repeater includes an FM scanning receiver that samples the radio band and enables the rebroadcast of signals only if FM subcarrier signals are not detected within the vicinity of the vehicle. As the vehicle re-approaches a populated area, continued scanning of the radio band eventually detects the presence of subcarrier signals and shuts down the repeater to ensure that it will not interfere with licensed terrestrial broadcasters.

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