Means for limiting the range of frequency regulation of oscillators

Claim 1

IN AN OSCILLATOR WHOSE FREQUENCY IS REGULATED RESPONSIVE TO AN ERROR VOLTAGE CORRESPONDING TO THE DIRECTION AND MAGNITUDE OF THE OSCILLATOR FREQUENCY DEVIATION FROM A PRESELECTED VALUE, LIMITER MEANS FOR LIMITING THE RANGE OF ACTION OF THE FREQUENCY REGULATION COMPRISING, IN COMBINATION, AN INPUT TERMINAL TO WHICH THE ERROR VOLTAGE IS APPLIED; AN OUTPUT TERMINAL CONNECTED TO THE OSCILLATOR; AN ELECTRONIC SWITCH HAVING A FIRST COMMON CONNECTION TO SAID INPUT AND OUTPUT TERMINALS AND A SECOND CONNECTION TO GROUND; AND CONTROL MEANS CONNECTED TO SAID INPUT TERMINAL AND TO SAID ELECTRONIC SWITCH AND EFFECTIVE, WHEN THE ERROR VOLTAGE APPLIED TO SAID INPUT TERMINAL IS WITHIN PRESELECTED LIMITING VALUES, TO CONDITION SAID ELECTRONIC SWITCH EFFECTIVE FOR APPLICATION OF SAID ERROR VOLTAGE AS A CONTROL VOLTAGE TO SAID OUTPUT TERMINAL AND TO THE OSCILLATOR; SAID CONTROL MEANS, WHEN THE ERROR VOLTAGE APPLIED TO SAID INPUT TERMINAL EXCEEDS SAID LIMITING VALUES, CONDITIONING SAID ELECTRONIC SWITCH MEANS TO CONNECT SAID INPUT AND OUTPUT TERMINALS TO GROUND TO INTERRUPT EFFECTIVE APPLICATION OF SAID CONTROL VOLTAGE TO SAID OUTPUT TERMINAL.