Mark Edwin Hawes

50862901, Feb 4, 1992

Mar 8, 1990

7/490282

Shawn G. Murray - Portland OR
Mark A. Hawes - Beaverton OR

G08B 108
H04Q 700

340539

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.