Variable power level frequency modulation transmitter

Claim 1

A TRANSMISSION SYSTEM INCLUDING: A FREQUENCY MODULATOR CIRCUIT FOR DEVELOPING AT THE OUTPUT THEREOF A MODULATED SIGNAL HAVING A SELECTED CARRIER FREQUENCY; A FURTHER CIRCUIT COUPLED TO THE INPUT OF SAID FREQUENCY MODULATOR CIRCUIT FOR INTRODUCING MODULATING SIGNALS TO SAID FREQUENCY MODULATOR CIRCUIT; A POWER AMPLIFIER CIRCUIT COUPLED TO THE OUTPUT OF SAID MODULATOR CIRCUIT FOR AMPLIFYING A MODULATED SIGNAL DEVELOPED THEREBY; A CONTROL SYSTEM COUPLED TO SAID POWER AMPLIFIER CIRCUIT AND RESPONSIVE TO AN APPLIED CONTROL SIGNAL FOR APPLYING A DIRECT CURRENT BIAS POTENTIAL TO SAID AMPLIFIER TO CONTROL THE POWER LEVEL THEREOF; MEANS INCLUDING HETERODYNE MIXER MEANS COUPLED TO ONE OF THE AFORESAID CIRCUITS, FOR HETERODYNING THE MODULATED SIGNAL TO A REDUCED CARRIER FREQUENCY AS COMPARED WITH SAID SELECTED CARRIER FREQUENCY, SAID MEANS COUPLED TO THE OUTPUT OF SAID AMPLIFIER; A FIRST FREQUENCY SELECTIVE CIRCUIT MEANS TUNED TO PASS SAID REDUCED CARRIER FREQUENCY INTERCOUPLING SAID MIXER TO SAID CONTROL SYSTEM FOR APPLYING THE CONTROL SIGNAL TO SAID CONTROL SYSTEM; FURTHER CIRCUIT MEANS COUPLED TO SAID CONTROL SYSTEM FOR DEVELOPING A DIRECT CURRENT BIAS POTENTIAL IN RESPONSE TO AN APPLIED SIGNAL AND FOR UTILIZING THE SAME TO ADJUST THE AFORESAID DIRECT CURRENT BIAS POTENTIAL; A SECOND FREQUENCY SELECTIVE CIRCUIT MEANS HAVING A RECIPROCAL CHARACTERISTIC WITH RESPECT TO SAID FIRST FREQUENCY SELECTIVE CIRCUIT MEANS AND COUPLED TO SAID FIRST FREQUENCY SELECTIVE CIRCUIT MEANS FOR APPLYING A SIGNAL TO SAID FURTHER CIRCUIT MEANS TO CAUSE SAID DIRECT CURRENT BIAS POTENTIAL OF SAID FURTHER CIRCUIT MEANS TO VARY IN A MANNER TO SUBSTANTILLY ELIMINATE VARIATIONS IN THE AMPLITUDE OF THE SIGNAL FROM SAID CONTROL SYSTEM RESULTING FROM AMPLITUDE VARIATIONS OF THE SIGNAL FROM SAID HETERODYNE MIXER MEANS.