1 1 The Detector unit senses magnetic heading

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1. The Detector unit senses magnetic heading. Induced voltages are passed on to selsyn A, where a magnetic field is established. If the rotor in A is at the null position (90º to the magnetic field) then the compass is syncronised. (During manufacture the heading indicator is syncronised with the rotor so that when the rotor is at null, the indicator is reading correctly). Sperry CL 2 6. The error signal produced in C is then fed to the follow up amplifier. 1. 6. Follow-up Amplifier Master Unit 7. 2. If the compass is not syncronised, an error signal is generated in A. This signal is then fed to the precession amplifier, where it is phase detected, rectified and amplified. 2. 5. Gyro Unit Precession Amplifier 3. 4. 5. The voltages produced in B are fed to C, which produces a voltage in C identical to that in B. The fact that B is turning and C is 4. B is energized by AC not produces an error signal in C. current (400 Hz), which produces a magnetic field and a voltage in B. 3. DC Current is then fed to the precession coil on the vertical gimbal of the gyro unit. The precession coil is energized, and interacts with the magnets, causing the gyro to precess in azimuth. The gyro and horizontal bevel gear turn in azimuth driving the vertical bevel gear, the shaft, B and the pointer or compass card. 2

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