Synchro arrangement

Claim 1

APPARATUS FOR DEFINING THE ROTATIONAL POSITION OF A SYNCHRO ROTOR COMPRISING A SYNCHRO HAVING THREE STATOR WINDINGS, A FIRST TRANSFORMER HAVING A PRIMARY AND A SECONDARY WINDING, A SECOND TRANSFORMER HAVING A CENTRE TAPPED PRIMARY WINDING AND A SECONDARY WINDING, SAID TRANSFORMERS HAVING THEIR PRIMARIES CONNECTED IN T OR SCOTT-CONNECTION, SAID PRIMARY WINDINGS BEING CONNECTED RESPECTIVELY TO THE STATOR WINDINGS OF SAID SYNCHRO, SAID SECONDARY WINDINGS BEING CONNECTED IN SERIES, A RESISTOR AND A CAPACITOR CONNECTED IN SERIES WITH EACH OTHER AND WITH SAID SECONDARY WINDINGS, OUTPUT TERMINALS CONNECTED TO THE JUNCTION OF SAID SECONDARY WINDINGS AND THE JUNCTION OF SAID RESISTOR AND CAPACITOR, A GATE ADAPTED TO BE OPENED BY A VOLTAGE APPLIED TO ONE INPUT TERMINAL AND TO BE SHUT BY A VOLTAGE APPLIED TO ANOTHER INPUT TERMINAL, A FURTHER INPUT TERMINAL AND AN OUTPUT TERMINAL ON SAID GATE WHICH ARE CONNECTED TOGETHER WHEN SAID GATE IS OPEN, A CLOCK PULSE GENERATOR CONNECTED TO SAID FURTHER INPUT TERMINAL, AND A SOURCE OF REFERENCE VOLTAGE CONNECTED TO ONE OF THE INPUT TERMINALS OF SAID GATE, SAID OUTPUT VOLTAGE BEING CONNECTED TO THE OTHER INPUT TERMINAL OF SAID GATE, WHEREBY THE NUMBER OF PULSES PASSING THROUGH SAID GATE DEPENDS UPON THE PHASE DIFFERENCE BETWEEN SAID OUTPUT VOLTAGE AND SAID REFERENCE VOLTAGE.