Transmitter with buzzer

Details Transmitter with buzzer Transmitter with buzzer

1981-01-23

1982-12-28

Caldwell, Sr., John W.

Communications: electrical

Continuously variable indicating

With meter reading

340696, 34082572, 455 95, 455115, 331 64, 332 20, 332 39, 49 25, G08C 1900

Patent

active

043664822

ABSTRACT:
A garage door opener system includes a radio receiver actuable by reception of a preselected radio signal for moving a garage door between opened and closed positions and a portable hand-held transmitter manually actuable to transmit such preselected radio signal to the receiver. The transmitter includes a radio frequency oscillator for producing the radio signal to be transmitted and a modulating means manually actuable to cause the oscillator to transmit a radio signal which is of the preselected form. An audio transducer is connected in parallel with the radio frequency oscillator to the output of the modulating means to produce an audio signal which corresponds in form to the electric signal modulating the radio frequency oscillator, which audio signal is audible to a person holding the portable transmitter.

REFERENCES:
patent: 3001066 (1961-09-01), Naber et al.
patent: 4010447 (1977-03-01), Podowski
patent: 4141010 (1979-02-01), Umpleby et al.

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