Overload protector circuit for radio receivers

Claim 1

IN A RADIO RECEIVER CIRCUIT THE COMBINATION INCLUDING AN INPUT TERMINAL ADAPTED TO RECEIVE RADIO FREQUENCY SIGNALS, A FIRST TUNED CIRCUIT CONNECTED TO SAID INPUT TERMINAL, A SECOND TUNED CIRCUIT COUPLED TO SAID FIRST TUNED CIRCUIT, A CONVERTER STAGE COUPLED TO SAID SECOND TUNED CIRCUIT, SAID FIRST AND SAID SECOND TUNED CIRCUITS INCLUDING VARIABLE MEANS FOR TUNING THE SAME TO A PREDETERMINED FREQUENCY, SAID SECOND TUNED CIRCUIT INCLUDING A TRIMMER CAPACITOR, A DIODE CONNECTED ACROSS SAID TRIMMER CAPACITOR, SAID TRIMMER CAPACITOR COOPERATING WITH SAID DIODE TO COMPENSATE FOR VARIATIONS IN THE CHARACTERISTICS THEREOF, SAID DIODE CONDUCTING WHEN THE SIGNAL APPLIED THERETO BY SAID SECOND TUNED CIRCUIT EXCEEDS A PREDETERMINED VALUE TO ALTER THE TUNING OF SAID SECOND TUNED CIRCUIT AND THEREBY REDUCE THE SIGNAL APPLIED BY SAID SECOND TUNED CIRCUIT TO SAID CONVERTER STAGE.