Dual-frequency induction-keyed control circuit with keying netwo

Details Dual-frequency induction-keyed control circuit with keying netwo Dual-frequency induction-keyed control circuit with keying netwo

1976-01-26

1978-08-08

Pitts, Harold I.

Communications: electrical

Condition responsive indicating system

Specific condition

340152T, 340552, 340171PF, 340149R, 343 65SS, H04Q 300

Patent

active

041060067

ABSTRACT:
A dual-frequency keyable control circuit is triggered into providing an electrical control output signal when two passive keying circuits, tuned to the correct radio frequencies are brought close enough to a sensing element of the keyable control circuit to cause mutual influence between the passive keying circuits and the sensing element.
When the keyable control circuit detects that modulation is present at both ratio frequencies in sequence, it produces control signals which can unlock a door, actuate or defeat an alarm, or perform other functions for which it is desired to require key combinations to attain access.

REFERENCES:
patent: 2541461 (1951-02-01), Churchill
patent: 3088106 (1963-04-01), Kingsford-Smith
patent: 3125753 (1964-03-01), Jones
patent: 3172102 (1965-03-01), Chapman
patent: 3732465 (1973-05-01), Palmer
patent: 3798642 (1974-03-01), Augenblick
patent: 3842324 (1974-10-01), Atkins

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