Variable frequency RF electronic surveillance system

Details Variable frequency RF electronic surveillance system Variable frequency RF electronic surveillance system

1983-07-05

1985-07-23

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

343 68LC, G08B 1324

Patent

active

045311170

ABSTRACT:
An electronic article surveillance system is disclosed, having a transmitter means for producing in an interrogation zone sequences containing a plurality of discrete different radio frequencies thereby causing a circuit present within the zone to resonate at its resonant frequency in response to energy absorbed at at least three different frequencies. A receiver means is provided to cause an alarm in the event of detection of three such resonances over two successive sequences.

REFERENCES:
patent: 3740742 (1973-06-01), Thompson et al.
patent: 3810172 (1974-05-01), Burpee et al.
patent: 4023167 (1977-05-01), Wahlstrom
patent: 4215342 (1980-07-01), Horowitz
patent: 4251808 (1981-02-01), Lichtblau
patent: 4321586 (1982-03-01), Cooper et al.
patent: 4476459 (1984-10-01), Cooper et al.

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