Telecommunications – Carrier wave repeater or relay system – With frequency conversion
Patent
1995-07-05
1997-12-09
Eisenzopf, Reinhard J.
Telecommunications
Carrier wave repeater or relay system
With frequency conversion
455 9, 455 331, 455 561, 379 60, H04B 714
Patent
active
056970528
ABSTRACT:
An SMR repeater is made agile by adding a microprocessor controlled frequency selection circuit to enable the repeater to operate on any one of several available frequencies in a band. For dispatch service, the output of the repeater is switched to a power amplifier feeding an omni-directional antenna. The repeater scans several frequencies sequentially. If a signal is detected, scanning is halted to provide repeater service, after which scanning is resumed. The frequency agile repeater is coupled to an antenna system having a narrow beam which can be steered electronically. A control computer scans the azimuth of the beam. The computer divides a service area into a plurality of cells extending radially from the antenna system and assigns channels as needed to service a subscriber. More than one cell can be on the same frequency without interference. The microprocessor includes a table in memory of call signs corresponding to particular transmission frequencies and causes the repeater to transmit the appropriate call sign when transmitting at a particular frequency.
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Eisenzopf Reinhard J.
Nguyen Lee
Wille Paul F.
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