Dual channel wide-band frequency modulated keyable control circu

Details Dual channel wide-band frequency modulated keyable control circu Dual channel wide-band frequency modulated keyable control circu

1976-10-28

1978-07-18

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307361, 331 65, 340552, H03K 1700

Patent

active

041017919

ABSTRACT:
A dead-oscillator detector in a wide band frequency modulated keyable control circuit averts attempted actuation of the unlocking function by the coupling of untuned energy-absorbing material, such as iron, to a sensing coil. The energy absorbing material, being unresponsive to frequency, reduces the rf energy in the sensing coil approximately uniformly at all swept frequencies. The dead oscillator detector, lacking an ac component in the rf envelope over the entire frequency band, generates an inhibit signal which prevents the unlocking function. When a tuned circuit is properly coupled to the sensing coil, the resulting ac component in the rf envelope provides one required enable signal to unlock circuits.

REFERENCES:
patent: 3248560 (1966-04-01), Leonard
patent: 3696253 (1972-10-01), Deisch
patent: 3723967 (1973-03-01), Alkins et al.

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