Cellular specialized mobile radio system

Telecommunications – Carrier wave repeater or relay system – With frequency conversion

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.

REFERENCES:
patent: 4039947 (1977-08-01), Miedema
patent: 4152647 (1979-05-01), Gladden et al.
patent: 4207522 (1980-06-01), Thornton et al.
patent: 4654879 (1987-03-01), Goldman et al.
patent: 4794635 (1988-12-01), Hess
patent: 4802235 (1989-01-01), Treatch
patent: 4941200 (1990-07-01), Leslie et al.
patent: 5006857 (1991-04-01), DeHart
patent: 5034993 (1991-07-01), Sasuta et al.
patent: 5095531 (1992-03-01), Ito
patent: 5115514 (1992-05-01), Leslie
patent: 5146186 (1992-09-01), Vella
patent: 5157709 (1992-10-01), Ohteru
patent: 5218354 (1993-06-01), Hess
patent: 5274838 (1993-12-01), Childress et al.
patent: 5437055 (1995-07-01), Wheatley
patent: 5485631 (1996-01-01), Bruckert
patent: 5488737 (1996-01-01), Harbin et al.
patent: 5596333 (1997-01-01), Bruckert

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Cellular specialized mobile radio system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cellular specialized mobile radio system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cellular specialized mobile radio system will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1617269

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.