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2. The azimuth and elevation handwheels are connected through magnetic clutches (L1 for azimuth, L2 for
elevation) to control transmitter synchros B1 and B5, respectively. When the system is energized and placed in the
manual mode of operation, 28-volts DC is applied through contacts of switch S2 to energize the magnetic clutches,
connecting the handwheels to their respective synchros. Rotation of the handwheel causes the respective synchro to
generate an error voltage which is used to reposition the antenna.
c. POLARIZATION CONTROLS AND INDICATORS - The polarization controls and indicators consist of the
POLARIZATION SELECT switch (item 22), S6; and the POLARIZATION V (item 23), H (item 24), RHC/+45 (item 21),
and LHC/-45 (item 20) indicator lights, DS15, DS16. DS14, and DS13, respectively.
1. The POLARIZATION SELECT switch, S6, allows selection of the desired mode of polarization. The
OPERATE pushbutton switch, S5, when depressed, implements the polarization change. When the antenna is
repolarized to the selected position, all indicator lights except the one associated with that position will go off.
d. BEAM WIDTH CONTROLS AND INDICATORS - These controls and indicators consist of the BEAM WIDTH
meter (item 5), M2, and the BEAM INCREASE BEAM DECREASE switch (item 4), S7.
1. The BEAM WIDTH meter, M2, which is graduated from 0 to 100, is electrically connected to a potentiometer
on the electromechanical linear actuator and indicates the position of the antenna feed as a percentage of increase
relative to the focal point of the antenna.
2. The BEAM INCREASE BEAM DECREASE switch, S7, is electrically connected to a reversible DC drive
motor on the electromechanical linear actuator on the antenna. Operation of switch S7 to the BEAM INCREASE position
energizes the DC drive motor, which is geared to a shaft supporting the antenna feed, driving the shaft toward the
antenna (i.e., extending the shaft). Operation of S7 to the BEAM DECREASE position causes the shaft to retract.
e. DIGITAL COUNTERS - Two digital counters, a TRUE ELEVATION counter (item 1) and a TRUE AZIMUTH
counter (item 12), are provided to indicate the azimuth and elevation angles of the antenna in degrees and tenths of
degrees.
f. CABLE WRAP. METER - The CABLE WRAP meter (item 6), M1, is essentially a 0- to 50-millimeter with a zero
center-scale marking and red markings, which indicate the limits of the cable wrap in either a CW or CCW direction at
either end.
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