broadening is controlled from the remotely located Control Indicator via cabling to the antenna pedestal, the elevation
data cable assembly from the antenna pedestal to the elevation drive, and a cable from the elevation drive to the
PARTS LIST - Table 5-1 is a major component parts list for the Antenna System and is referenced to
DESCRIPTION OF SYNCHROS
GENERAL - The Antenna System employs synchro devices throughout the positioning and drive circuits
(Control Indicator and Azimuth and Elevation drives) to transmit and receive local and remote antenna position data.
Detailed synchro theory is not included in this handbook; however, a general description of each type of synchro used is
TYPES OF SYNCHROS USED - Synchro devices used in the Antenna System consist of synchro control
transmitters. control transformers, and differential control transmitters. A brief description of these devices is presented
in the following paragraphs to assist in a better understanding of the system.
SYNCHRO TRANSMITTERS - Synchro control transmitters (CX) are used in the antenna system. The
control transmitter can drive only a relatively small load. In the Antenna System, the synchro transmitters are used to
drive control transformers (CT). The rotor winding of these synchros consists of a single machine-wound coil with the
axis perpendicular to the shaft. The rotor functions as the excitation for the primary winding of the synchro. The stator is
a cylindrical structure of slotted laminations on which Y-connected coils are wound with their axes 120 degrees apart.
The stator acts as a secondary winding and its excitation is supplied by the rotor through transformer action.
CONTROL TRANSFORMERS - The control transformer is used as a companion unit with a control
transmitter to comprise a synchro control system. This type of control transformer is designed to supply an AC voltage
from its rotor terminals with a magnitude and phase determined by its angular position relative to that of the control
discussed in several important respects. The rotor winding is never connected to the AC supply voltage, it induces no
voltage in the stator winding, and stator currents are determined only by the voltage supplied to the high impedance
windings. Also, rotor position has very little effect on stator current. There is no appreciable current flowing in the rotor
winding because its output voltage is always applied to a high-impedance load. In the Antenna System, the high-
impedance load is the servoamplifier in the Antenna Position Control Indicator or in the antenna pedestal. The rotor is
not attracted to a particular position when voltage is applied to the stator winding. The rotor shaft is turned by an