H. f. electrical signal reception with two wire line carrying power, control, and information signals

Claim 2

Apparatus for the reception of high frequency electrical signals, which apparatus comprises, a signal operating device, means for applying an electrical signal to said signal operating device, an electrical receiver, a two line feeder connecting the signal operating device to said electrical receiver, means for applying the electrical signals from the operating device over the two line feeder to the electrical receiver, means for producing in the receiver a source of direct current power supply for the signal operating device, means for producing in the receiver a direct current control voltage for the signal operating device, means for superimposing the control voltage onto the voltage of the power supply, means for applying from the receiver to the two line feeder the power supply voltage with the control voltage superimposed thereon, means at the signal operating device for separating the control voltage from the power supply voltage, means for applying the separated power supply to the signal operating device for the energisation of the device, and means for applying the separated control voltage to the signal operating device for controlling a function of the signal operating device.

Claim 3

Apparatus as claimed in claim 1, in which said signal operating device comprises a mixer and oscillator means for providing an intermediate frequency signal, the function controlled by the separated control voltage being the frequency of the oscillator.

Claim 4

Apparatus as claimed in claim 1, in which the superimposing means comprises an adder circuit, a choke means for coupling the output of said adder to said two line feeder, and a capacitor means for coupling one line of said feeder to the circuitry of said electrical receiver.

Claim 5

Apparatus for the reception of high frequency electrical signals, which apparatus comprises, a signal operating device, means for applying one electrical signal to said signal operating device, an electrical receiver, a two line feeder connecting the signal operating device to said electrical receiver, means for applying the electrical signals from the operating device over the two line feeder to the electrical receiver, means for producing in the receiver a source of direct current power supply for the signal operating device, means for producing in the receiver a direct current control voltage for the signal operating device, means for superimposing the control voltage onto the voltage of the power supply, means for applying from the receiver to the two line feeder the power voltage with the control voltage superimposed thereon, means at the signal operating device for separating the control voltage from the power supply voltage comprising an emitter follower circuit having collector, base, and emitter electrodes, means for applying the separated power supply to the signal operating device for the energisation of the device, means for applying the separated control voltage to the signal operating device for controlling a function of the signal operating device, means for applying the power supply and superimposed control voltage to said collector, means for applying a voltage substantially at the power supply voltage to said base, and means for deriving from the emitter of said circuit the separated power supply.

Claim 6

Apparatus for the reception of high frequency electrical signals, which apparatus comprises, a signal operating device, means for applying one electrical signal to said signal operating device, an electrical receiver, a two line feeder connecting the signal operating device to said electrical receiver, means for applying the electrical signals from the operating device over the two line feeder to the electrical receiver, means for producing in the receiver a source of direct current power supply for the signal operating device, means for producing in the receiver a direct current control voltage for the signal operating device, means for superimposing the control voltage onto the voltage of the power supply, means for applying from the receiver to the two line feeder the power voltage with the control voltage superimposed thereon, means at the signal operating device for separating the control voltage from the power supply voltage comprising an emitter follower circuit having collector, base, and emitter electrodes, means for applying the separated power supply to the signal operating device for the energisation of the device, means for applying the separated control voltage to the signal operating device for controlling a function of the signal operating device, means for applying the power supply and superimposed control voltage to said collector, means for applying a voltage substantially at the power supply voltage to said base, and means for deriving from the emitter of said circuit the separated power supply.

Claim 7

Apparatus as claimed in claim 4 further comprising a voltage reference device means for receiving said power supply and superimposed control voltage and for supplying the required control voltage for said signal operating device, the voltage of said voltage reference device being that of said power supply.

Claim 8

Apparatus as claimed in claim 4, in which said power supply and superimposed control voltage is applied to a voltage reference device from which the required control voltage for said signal operating device is obtained, the voltage of said voltage reference device being that of said power supply.