Test device for signal-radiating and receiving equipment

Claim 1

A TEST DEVICE FOR SIGNAL-RADIATING AND -RECEIVING EQUIPMENT OF THE TYPE WHICH IS ADAPTED TO TRANSMIT AND RECEIVE SIGNALS HAVING A CARRIER COMPONENT AND AT LEAST ONE SIDEBAND COMPONENT COMPRISING SIGNAL PICKUP MEANS DISPOSED IN THE FIELD OF RADIATION OF SAID EQUIPMENT TO RECEIVE SIGNALS THEREFROM, A SIGNAL SEPARATOR COUPLED TO SAID SIGNAL PICKUP MEANS FOR DIVIDING SAID RECEIVED SIGNALS INTO TWO DISTINCT FLOW PATHS, FILTERING MEANS COUPLED TO ONE OF SAID FLOW PATHS, SAID FILTERING MEANS BEING SO CONSTRUCTED AS TO TRANSMIT SUBSTANTIALLY ONLY THE CARRIER COMPONENTS OF SAID RECEIVED SIGNALS, A DETECTOR COUPLED TO THE OTHER OF SAID FLOW PATHS, SAID DETECTOR BEING SO CONSTRUCTED AS TO PRODUCE OUTPUT SIGNALS OF A FREQUENCY EQUAL TO THE DIFFERENCE IN FREQUENCY BETWEEN THE CARRIER AND SIDEBAND COMPONENTS OF SAID RECEIVED SIGNALS, A SIGNAL GENERATOR COUPLED TO THE OUTPUT OF SAID DETECTOR FOR PRODUCING A CONTINUOUS WAVE SIGNAL IN RESPONSE TO SAID OUTPUT SIGNALS, A MODULATOR COUPLED TO SAID SIGNAL GENERATOR FOR MODULATING SAID CONTINUOUS WAVE SIGNAL IN ACCORDANCE WITH EXTERNALLY SUPPLIED CONTROL INPUTS, A MIXER COUPLED TO SAID MODULATOR AND SAID FILTERING MEANS FOR PRODUCING RETURN SIGNALS BY COMBINING SAID CARRIER COMPONENTS TRANSMITTED THROUGH SAID FILTERING MEANS WITH THE MODULATED CONTINUOUS WAVE SIGNAL AFORESAID, AND MEANS FOR TRANSMITTING SAID RETURN SIGNALS TO SAID EQUIPMENT.