Figure 4-31.--Simplified diagram of the roll and pitch follow-up system.

misalignment signal to the follow-up amplifier in the

tilt signal input, will tend to reduce the input slowly until

conventional manner. The follow-up motor, driven by

the voltage output of the linear synchro exactly equals

the azimuth follow-up amplifier output, drives the

the tilt signal input caused by the unbalance.

azimuth phantom, restoring the azimuth pickoff to its

The time constant, or rate of change, of the linear

neutral position and positioning, through gearing, the 1-

synchro output voltage for a given tilt signal is made slow

and 36-speed heading data synchro transmitters. The

enough so as not to affect the normal settling character-

follow-up motor also positions the rotor of the roll-pitch

istics of the compass, and yet fast enough to compensate

resolver (not shown in fig. 4-30) to a position

for any constant torque without appreciable delay.

corresponding to ship's heading.

Azimuth Follow-up System

The azimuth follow-up amplifier consists of a

preamplifier stage, a demodulator stage with displace-

The azimuth follow-up system (fig. 4-30) detects

ment and rate signal networks, and a magnetic amplifier

any misalignment between the vertical ring and the

output stage. Associated with the amplifier are two

gyrosphere and functions to drive the azimuth phantom,

alarm circuits, which actuate the compass alarm in case

and therefore the vertical ring, back into alignment with

of excessive pickoff signal or preamplifier tube failure.

the gyrosphere.

Roll and Pitch Follow-up System

An azimuth pickoff, consisting of an E-shaped core

transformer mounted on the vertical ring and an

The roll and pitch follow-up system (fig. 4-31)

detects and eliminates any misalignment between the

armature cemented to the gyrosphere, furnishes the

Figure 4-31.--Simplified diagram of the roll and pitch follow-up system.