c. Remove the allen-head screws holding the sector scan clutch and potentiometer in position -and move
the assembly far enough to disengage the gears. Position the cam so that sector scan limit switch S8 is aligned with the
center of the cam lobe. Reengage the gears and secure the assembly to the transmission housing.
d. Connect an ohmmeter between the B and CW terminals of potentiometer R4.
e. Loosen the screws holding R4 in position and slowly rotate R4 until the ohmmeter indicates approximately
500 ohms. Secure R4 in position and remove the ohmmeter.
R4 should be readjusted in accordance with the procedures set forth in Section m of this manual,
paragraph 5. A(4), when the system is operating.
f. Manually rotate the azimuth gear train CW (TRUE AZIMUTH counter increasing) 630 degrees. The
counter should indicate 270. 0.
g. Loosen sector scan limit stop switch S8 and rotate the gear train CCW 540 degrees. Observe that the
contacts of switch S8 again make between 90 and 60 degrees.
D. SCHEMATIC DIAGRAM AND PARTS LIST - The schematic diagram for the Antenna Position Control Indicator is
14. ANTENNA CONTROL POWER SUPPLY
A. GENERAL - The unit is capable of supplying power, servo excitation, and azimuth orient correction factors for the
Antenna System. In addition, the unit provides the controls necessary to control power, pressure, and driving of the
B. THEORY OF OPERATION - This subsection contains the theory of operation for the components within the
Power Supply. A detailed description of these components, as used in the system, is contained in paragraph 2, Section I,
of this manual. The theory of operation of the synchro devices used in the Power Supply is contained in paragraph 2 of