Automatic phase control loop without false locks due to harmonics

Claim 1

A PHASE LOCKED SPECTRUM GENERATOR COMPRISING A FIRST OSCILLATOR HAVING A FIRST FREQUENCY OUTPUT, A SECOND OSCILLATOR HAVING A SECOND FREQUENCY OUTPUT, A THIRD OSCILLATOR HAVING A CONTROL INPUT AND A THIRD FREQUENCY OUTPUT, WHEREIN SAID THIRD FREQUENCY IS THE DIFFERENCE BETWEEN SAID FIRST AND SECOND FREQUENCIES, A MIXER HAVING PLURAL INPUTS AND AN OUTPUT AND WITH SAID SECOND AND THIRD OSCILLATORS CONNECTED TO INPUTS OF SAID MIXER, THE OUTPUT OF SAID MIXER BEING THE DIFFERENCE BETWEEN SAID SECOND AND THIRD FREQUENCIES AND EQUAL TO SAID FIRST FREQUENCY, SAID MIXER OUTPUT BEING CONNECTED TO AN INTERMEDIATE AMPLIFIER HAVING AN OUTPUT, SAID INTERMEDIATE AMPLIFIER OUTPUT AND SAID FIRST OSCILLATOR OUTPUT BEING CONNECTED TO A PHASE DETECTOR HAVING AN OUTPUT, CONNECTING MEANS BETWEEN SAID PHASE DETECTOR OUTPUT AND THE CONTROL INPUT OF SAID THIRD OSCILLATOR, AND FOURTH OSCILLATOR HAVING A CONTROL INPUT AND A FOURTH FREQUENCY OUTPUT, AN ADDITIONAL MIXER MEANS HAVING PLURAL INPUTS AND AS OUTPUT, SAID THIRD AND FOURTH OSCILLATORS BEING CONECTED TO INPUTS OF SAID ADDITIONAL MIXER, THE OUTPUT OF SAID MIXER GEING THE DIFFERENCE BETWEEN SAID THIRD AND FOURTH FRQUENCIES AND EQUAL TO SAID FIRST FREQUENCY, SAID ADDITIONAL MIXER OUTPUT BEING CONNECTED TO AN ADDITIONAL INTERMEDIATE AMPLIFIER HAVING AN OUTPUT, SAID ADDITIONAL INTERMEDIATE FREQUENCY AMPLIFIER OUTPUT AND SAID FIRST OSCILLATOR OUTPUT BEING CONNECTED TO AN ADDITIONAL PHASE DETECTOR HAVING AN OUTPUT CONNECTED TO AN ADDITIONAL CONNECTING MEANS, SAID ADDITIONAL CONNECTING MEANS BEING ALSO CONNECTED TO THE CONTROL INPUT OF SAID FOURTH OSCILLATOR.