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 TM 55-1905-220-14-11
5-117. SHIP'S COURSE INDICATOR-MAINTENANCE INSTRUCTIONS (Continued).
4
To remove this condition (false null), an anti-stickoff voltage of 2.5 volts is obtained from a transformer in
the amplifier unit and applied to the coarse error voltage. This voltage is applied either in phase or 180
degrees out of phase with the 1X error voltage and is sufficient to shift the 1X error signal null points 2.5
degrees. The resultant voltage does not pass thru the zero reference position of the 36XCT voltage (figure
B). To restore the voltage to the zero reference position, the 1XCT stator is shifted a total of 5 degrees which
corresponds to 180rotation (36 times the IX) of the 36X synchro (figure C).
FIGURE B
FIGURE C
5
With anti-stickoff bias, the false null at the 180 degree point cannot be attained by virtue of either the 36X
or 1X error signal on either side of this point both being of such polarity as to drive in the same direction to
the real null at zero degrees. The 36X error signal drives 2.5 degrees toward the correct null, and the mixing
net- work switches to the 1X error signal, which drives to 2.5 degrees from the zero degree null position.
5-1310
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