INDEX-1 MODULE 15  INDEX A Ac rate generator, 2-21 Ac servo motors, 2-27 Acceleration servo, 2-11 Accelerometers, 3-19 basic, 3-20 E-transformer, 3-21 pulse-counting, 3-22 B Bandpass frequencies in a servo system, 2-16 Basic servo system, 2-3 operation of, 2-3 functional servo loops, 2-5 C Capacitors, synchro, 1-39 Closed-loop control system, 2-3 Control synchro systems, 1-33 system operation, 1-35 transformers, 1-34 Control systems, 2-1 closed-loop, 2-3 open-loop, 2-2 Control transformers, 1-34, 2-21 Crystal diode modulators, 2-23 D Dc rate generator, 2-23 Dc servo motors, 2-27 Degrees of freedom, gyros, 3-11 effect of mechanical drift, 3-13 effect of rotation of the Earth, 3-12 establishing and maintaining a fixed position, 3-14 mercury ballistic erecting system, 3-15 mercury erecting system, 3-14 Demodulators in the servo system, 2-25 diode demodulator, 2-25 E Error detectors, 2-18 control transformers, 2-21 E-transformers, 2-19 summing networks, 2-19 Error-rate damping, 2-14 E-transformer accelerometer, 3-21 E-transformers, 2-19 F Frequency response, 2-15 bandpass frequencies in a servo system,    2-16 oscillating input signal, 2-15 Friction clutch damping, 2-13 G Gyros, 3-1 accelerometers, 3-19 basic gyro elements, 3-4 basic properties of gyroscopes, 3-2 degrees of freedom, 3-11 precession, 3-3, 3-7 rate gyros, 3-15 rigidity, 3-5 I IC synchros, 4-1 M Magnetic amplifiers, 2-28 in a servo, 2-28 Magnetic clutch, 2-13 Markings and symbols, standard, synchros, 1-5 military standard synchro code, 1-6 Navy prestandard synchro code, 1-6 schematic symbols, 1-7 Mercury ballistic erecting system, 3-15 Mercury erecting system, 3-14