Mobile perimeter monitoring system

Details Mobile perimeter monitoring system Mobile perimeter monitoring system

1990-03-08

1992-02-04

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340531, 340573, 455 9, 455 67, 455229, G08B 108, H04Q 700

Patent

active

050862901

ABSTRACT:
A mobile perimeter monitoring system includes a battery powder transmitter adapted to be placed upon the person to be monitored while the system user carries a receiver. The receiver responds to a code transmitted by the transmitter and provides an in-range or out-of-range indication depending upon whether the receiver is within the effective range of the transmitter or outside of its effective range. An adjustment on the receiver allows the user to adjust the effective range of the system for varying environments. The receiver may be operated in an in-range mode or an out-of-range mode to provide both perimeter monitoring capability and the ability to track a transmitter if its moves outside the perimeter.

REFERENCES:
patent: 4101872 (1978-07-01), Pappas
patent: 4598272 (1986-07-01), Cox
patent: 4633231 (1986-12-01), Kilian
patent: 4675656 (1987-06-01), Narcisse
patent: 4777478 (1988-10-01), Hirsch et al.
patent: 4785291 (1988-11-01), Hawthorne
patent: 4833452 (1989-05-01), Currier
patent: 4853692 (1989-08-01), Wolk et al.
patent: 4871997 (1989-10-01), Adriaenssens et al.

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