Narrow bandwidth receiver with output equal to the voltage difference of a selected modulation frequency and all frequency voltages

Claim 1

A REMOTE CONTROL RADIO RECEIVER FOR USE WITH A CARRIER WAVE HAVING A PREDETERMINED LOWER FREQUENCY INTELLIGENCE THEREON, COMPRISING IN COMBINATION, AN INPUT CIRCUIT FOR RECEIVING SAID CARRIER WAVE, AN AMPLIFIER IN SAID RADIO RECEIVER HAVING AN OUTPUT AND AMPLIFYING SAID INTELLIGENCE FREQUENCY COMPONENT OF SAID CARRIER WAVE, TRANSFORMER MEANS HAVING PRIMARY MEANS CONNECTED IN SAID OUTPUT OF SAID AMPLIFIER, FIRST AND SECOND SECONDARY MEANS ON SAID TRANSFORMER MEANS, A FIRST LOAD RESISTOR AND FIRST RECTIFIER MEANS CONNECTED IN SERIES ACROSS SAID FIRST SECONDARY MEANS, SAID PRIMARY MEANS AND SAID FIRST SECONDARY MEANS COMPRISING WINDING MEANS, CAPACITIVE MEANS CONNECTED TO SAID WINDING MEANS TO RESONATE SAME TO DEVELOP A DC VOLTAGE ON SAID FIRST LOAD RESISTOR IN ACCORDANCE WITH SAID PREDETERMINED INTELLIGENCE FREQUENCY, A SECOND LOAD RESISTOR AND SECOND RECTIFIER MEANS CONNECTED IN SERIES ACROSS SAID SECOND SECONDARY MEANS TO DEVELOP A DC VOLTAGE ACROSS SAID SECOND LOAD RESISTOR IN ACCORDANCE WITH ALL ALTERNATING OUTPUT VOLTAGES OF SAID AMPLIFIER, RELAY MEANS HAVING INPUT MEANS AND AN OPERATION THRESHOLD, MEANS CONNECTING SAID FIRST AND SECOND LOAD RESISTORS IN THE INPUT CIRCUIT OF SAID RELAY MEANS WITH SAID FIRST AND SECOND LOAD RESISTORS BEING CONNECTED IN OPPOSITION WITH SAID FIRST LOAD RESISTOR BEING CONNECTED TO INCREASE THE INPUT TO SAID RELAY MEANS, SAID FIRST AND SECOND LOAD RESISTORS DEVELOPING VOLTAGES IN OPPOSITION UPON SAID RECEIVER RECEIVING ATMOSPHERIC NOISE OR A CARRIER HAVING INCORRECT INTELLIGENCE FREQUENCY THEREON SO THAT SAID RELAY MEANS IS NOT ACTUATED, AND SAID FIRST LOAD RESISTOR DEVELOPING A VOLTAGE CONSIDERABLY IN EXCESS OF THE VOLTAGE ACROSS SAID SECOND LOAD RESISTOR UPON A CARRIER BEING RECEIVED HAVING INTELLIGENCE OF SAID PREDETERMINED FREQUENCY TO INCREASE THE INPUT TO SAID RELAY MEANS TO A LEVEL EXCEEDING SAID OPERATION THRESHOLD TO ACTUATE SAID RELAY MEANS TO THE PULL-IN CONDITION.