Operating Garage Doors by Radio

Radio Record, Volume IV, Issue 39, 10 April 1931, Page 11

Operating Garage Doors by Radio

Ingenious Device

Q)PENING and closing the doors of the private garage by radio is, the latest American idea in automotive accessories. The operation is performed by a specialised dashboard radio set, which transmits a signal that automatically opens the garage doors. The device is said to be very simple-a pul on a knob on the instrument-board. of the car, and the garage doors open ; another pull and they close. A tiny transmitting set igs installed in ‘the car, and the receiving set,. to: gether with the door-opening mechan: ism, is mounted within the garage. The transmitter consists of three main parts-the timer, the spark Le unit, and the transmitting aerial. timer, which governs the sending vot the impulses, is encased in a small box. and mounted under the instrumentboard by means of a clamp. The coil unit clamped to the main frame. fur: nishes the high frequency current neces: sary for broadcasting. To the observer there is only one part of the méchanism visible-that is, the small knob which protrudes from beneath the instrument-board, mounted on the wall inside the garage. Connected to it is the receiving aerial, which consists of a wire buried in the driveway. Radio impulses sent out from thé car are thus transferred to the receiver. Upon receiving the correct series of impulses the receiver closes a contract, thus setting the door opening mechanism in operation.