Synchronization of receiver to transmitter

Details Synchronization of receiver to transmitter Synchronization of receiver to transmitter

1994-10-14

1996-02-06

Urban, Edward F.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455 383, 455343, 455 70, 340539, H04B 700, H04B 116

Patent

active

054902860

ABSTRACT:
A location monitoring system is provided having a radio frequency transmitter for a person or object and radio frequency receiver for someone to monitor movement of the person or object, the receiver sounding an alarm at a predetermined time after failure to receive a signal. The transmitter is made having an intermittent transmitted signal and the receiver is made having an off-timer to coordinate with the intermittent signal, the off times saving battery power. The radio frequency receiver has an electronic switching device controlled by the radio frequency transmitter for sounding an alarm. An antenna is located in part of the carrying strap of the transmitter. The radio frequency transmitter can have various devices for sounding the alarm.

REFERENCES:
patent: 4101872 (1978-07-01), Pappas
patent: 4101873 (1978-07-01), Anderson et al.
patent: 4398192 (1983-08-01), Moore
patent: 4449248 (1984-05-01), Leslie et al.
patent: 4698748 (1987-10-01), Juzswik et al.
patent: 5175868 (1992-12-01), Yasuoka

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