Abstract: An apparatus for transmitting measured value signals from a movable object to an object fixed relative thereto, includes a transmitter and receiver, each containing a common oscillatory circuit, carried on the fixed object, and a coupling circuit, also containing an oscillatory circuit, carried by the movable object, the oscillatory circuits for the transmitter and receiver being alternately switched between operative and inoperative conditions, whereby an oscillatory frequency signal is first transmitted by the transmitter to energize the oscillatory circuit of the coupling circuit, and then the transmitter is switched off and the receiver is switched on to receive the oscillatory frequency signals from the coupling circuit.

Abstract: A device for transmission at least of one measurement value from a moveable object to an object stationary relative to the latter, particularly from a motor vehicle wheel to the vehicle frame of a motor vehicle, with a transmission stage and a receiving stage, which both are secured on the stationary object, and a coupling element which is secured on the moveable object and via which the receiver is able to be applied with a measuring value signal; characterized in the manner that a transmission stage transmits two transmission signals of different frequencies. At least one coupling element mixes the two frequencies and a receiving stage is responsive to at least one signal with a mixing frequency, which signal is transmitted by the coupling element.