Coded signal radio transmitter for remote control mechanisms

Details Coded signal radio transmitter for remote control mechanisms Coded signal radio transmitter for remote control mechanisms

1981-07-28

1983-08-16

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

331 47, H04B 700, H04Q 900

Patent

active

043994385

ABSTRACT:
A radio transmitter is operatively arranged to develop and broadcast a coded signal which may be used to effect remote control functions, for example, to control door opening mechanism. The transmitter includes a radio frequency oscillator having a coil which constitutes the radiating element. The radio frequency oscillator is modulated by a first low frequency oscillator, which is frequency modulated by output from a second low frequency oscillator, both low frequency oscillators being controlled by a timer which turns the low frequency oscillators ON for about one second and holds them OFF for about thirty seconds. The low frequency oscillators and the timer are realized by a commercially available, integrated CMOS circuit.

REFERENCES:
patent: 3270284 (1966-08-01), Schanbacher
patent: 3760422 (1973-09-01), Zimmer et al.
patent: 3914711 (1975-10-01), Carlson et al.
patent: 4109239 (1978-08-01), Davis

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