Sliding tone command receiver system

Details Sliding tone command receiver system Sliding tone command receiver system

1976-09-13

1978-03-14

Griffin, Robert L.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

325 65, 343225, H04B 700, H04B 1500

Patent

active

040793168

ABSTRACT:
The system employs a sliding tone FM signal to command a remote device such s a balloon; for example, to fire a squib for balloon release. The tone is a slowly-changing, progressively-increasing signal received and detected by discriminator circuitry for application to a phase-locked loop circuit. Comparison of the loop output with a reference voltage provides a release signal when the reference voltage is exceeded. Since the reference voltage is determined by the loop voltage produced by a predetermined command tone, the generation of the release signal is dependent upon the presence of that particular command frequency. A unijunction transistor and an SCR then function as a relay to close a battery-squib circuit. The slowly-changing, sliding tone, as well as the time constant of the phase locked loop circuit, provide a high degree of security from accidental commands and also permit a wide variation in component tolerance including temperature tolerance. Simplicity and low cost permit the receiver to be considered expendable.

REFERENCES:
patent: 3484693 (1969-12-01), Fong
patent: 3486118 (1969-12-01), Sanders et al.
patent: 3493865 (1970-02-01), Miller
patent: 3530472 (1970-09-01), Fukata et al.

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