Constant amplitude pilot signal source

Claim 1

APPARATUS FOR PROVIDING A SINUSODIAL OUTPUT SIGNAL OF CONSTANT AMPLITUDE REGARDLESS OF AMPLITUDE VARIATIONS IN INPUT SIGNAL, WHICH COMPRISES: (A) INPUT MEANS ADAPTED TO RECEIVE SINUSOIDAL SIGNAL OF VARYING AMPLITUDE; (B) SAID FIRST TRANSISTOR HAVING A BASE, AN EMITTER, AND A COLLECTOR; (C) MEANS BIASING SAID FIRST TRANSISTOR FOR CONDUCTION IN THE LINEAR REGION THEREOF AND INCLUDING A POWER SUPPLY, AND COUPLING MEANS INCLUDING A CONDUCTOR AND RESISTOR COUPLING SAID POWER SUPPLY BETWEEN THE COLLECTOR AND EMITTER OF SAID FIRST TRANSISTOR; (D) A SECOND TRANSISTOR HAVING A BASE OF ONE CONDUCTIVITY TYPE AND AN EMITTER AND COLLECTOR OF THE OPPOSITE CONDUCTIVITY TYPE; (E) MEANS COUPLING THE BASE OF SAID SECOND TRANSISTOR WITH THE COLLECTOR OF SAID FIRST TRANSISTOR; (F) A DIODE COUPLED IN PARALLEL WITH THE BASE AND EMITTER OF SAID SECOND TRANSISTOR FOR CLAMPING THE MAXIMUM VOLTAGE THEREBETWEEN AT A PREDETERMINED VALUE DURING ONE-HALF CYCLE OF IMPRESSED VOLTAGE;