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connected to the stator leads of control transformer synchro B1, one in each of the antenna pedestals, which are geared
in a 1:1 ratio with the respective azimuth drive assembly. The output of the control transformer is an error voltage, the
amplitude of which is proportional to the rotational displacement and the phase of which is a function of the direction of
displacement between the shafts of the differential controlled transmitter in the Power Supply and the control transformer
in the antenna pedestal. This error voltage is applied to a solid-state servoamplifier in the antenna pedestal. The output
of the servoamplifier is an AC voltage which drives servo motor MG1 to reposition the antenna through a gear train,
which is also coupled to the rotor of control transformer synchro B1 and remote data torque transmitter synchro B2.
Thus, the antenna, and subsequently control transformer B1, is driven in a direction which reduces the error voltage from
the control transformer to zero. The limit switch on the output of the azimuth servoamplifier limits the azimuth rotation
capabilities of the antenna to 270 degrees. When a limit is engaged, the limit switch opens, causing the current from
the servoamplifier to flow through the large load resistor, reducing the amount of drive voltage to MG1. This switch
opens 30 degrees before the mechanical stops are engaged and acts as a buffer for the mechanical stops. In elevation,
the limit switch functions the same, limiting the elevation capability of the antenna from -15 to +95 degrees, and engages
3 degrees before the mechanical stops.
(3) SLAVE MODE OF OPERATION
NOTE
Since the azimuth and elevation channels function the same in the slave mode of operation, only
the azimuth channel is discussed herein.
In the slave mode of operation, a 60-cps slave input voltage from a control transmitter synchro in a remote antenna or
radar system is applied to the stator leads of the slave control transformer synchro B1 in the Control Indicator and,
through contacts of MODE SELECT switch S2, which in this mode is in the SLAVE position, to the azimuth orient
differential control transmitter synchros in the power supply. The function of the system from the differential control
transmitter synchros through repositioning of the antenna is the same in the slave mode of operation as in the manual
mode of operation; however, the slave input from the remote system which is applied to slave control transformer B1 in
the Control Indicator is used to drive the true azimuth counter to indicate the position of the antenna pedestal. This is
accomplished as follows: The output of slave control transformer B1 in the Control Indicator is an error voltage, the
amplitude of which is proportional to the rotational displacement and the phase of which is a function of the direction of
displacement between the shaft of the remote master control transmitter synchro in the radar or antenna system and the
shaft of control transformer synchro B1 in the Control Indicator.
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