TM 11-5840-281-5/1
Control C-6989/TPN-18 performs two basic functions:
and K4006 are restored and relay K4009 is operated.
establishes the antenna control circuitry configuration in
Relay K4012 is restored by the contacts of operated
accordance with the mode selected by SCAN MODE
relay K4009. The contacts of restored relay K4005 apply
switch S1102 on the front panel of Pulse Generator O-
+28 volts to the 10-degree scan winding of the elevation
1333/TPN-18; and generates the az-el switching and
actuator motor in Antenna Drive TG-114/TPN-8 to
blanking gates.
position Antenna AS-1292/TPN-8 linkage in the 10 EL
(1) In the normal mode of operation, EL
configuration. Limit switch S505 in Antenna Drive TG-
MOTOR ON-OFF relay K4011 is operated through the
114/TPN-8 interrupts the +28 volts when the antenna
contacts of operated SCAN ON relay K4018 and the
linkage is properly positioned. The contacts of restored
contacts of restored SEARCH relay K4007.
The
relay K4012 apply power to the elevation drive motor in a
contacts of operated relay Kz4011 apply the 3-phase,
24-pole configuration, driving the motor at half speed.
400-Hz power to the contacts of operated EL MOTOR
The output of 10-degree el synchro B502 is coupled
SPEED control relay K4012. Relay K4012, which is
through dropping resistor R4056, through the contacts of
operated by the contacts of restored 600 AZ relay
operated relay K4009, and the contacts of operated relay
K4009, interconnects elevation drive motor B501
K4010, to the electronic control preamplifier as the
terminals T4001, T4002, and T4003, and applies the 3-
azimuth drive signal. The azimuth position signals are
phase power to drive motor terminals T4004, T4005, and
coupled to the electronic control preamplifier through the
T4006.
This connects the motor in a 12-pole
contacts of operated relay K4013.
The azimuth
configuration and the drive motor runs at full speed.
reference shift signal is disconnected from the electronic
(2) The output of 10-degree el synchro
control preamplifier in the 60-degree az mode because
B502 is coupled through dropping resistor R4055 and the
both relay K4010 and relay K4006 are restored The
contacts of operated NORM relay K4010 to the input of
azimuth reference shift signal is not necessary in the 60-
the electronic control preamplifier as the azimuth drive
degree az mode because the mechanical alignment of
signal. The azimuth reference shift signal is taken at the
azimuth synchro B1001 with respect to the elevation
wiper arm of 30 AZ OFFSET control R4062 and applied
synchro is made in the 60-degree az mode.
through the contacts of operated relay K4010 to the input
(5) In the simultaneous mode, the azimuth
of the electronic control amplifier. The output of azimuth
drive signal from elevation synchros B502 and B503, the
synchro B1001 is connected to the electronic control
azimuth position signal from azimuth synchro B1001, and
preamplifier through the contacts of operated SEARCH
the azimuth reference shift signal from 30 AZ OFFSET
PREC relay K4013 which is operated in all the precision
control R4062 are disconnected from the electronic
modes. Azimuth synchro rotor power is supplied through
control preamplifier by means of restored relays K4010,
relay K4013.
K4006, and K4009. The search rpm signal is derived
(3) In the 35-degree el mode, NORM relay
from the wiper of SEARCH RPM control R5059 and is
K4010 is restored and 10 --350 EL relay K41005 and
coupled to the electronic control preamplifier via
35 EL relay K4006 are operated. The contacts of
operated relay K4018 and relay K4008. Relay K4012 is
operated relay K4005 apply +28 volts to the :35-degree
restored by the restored contacts of relay K4009;
el scan winding of the elevation actuator motor in
consequently, 400-Hz power is applied to elevation drive
Antenna Drive TG-114/ TPN-8. Limit switch S504 in
motor B501 in a 12-pole configuration and the motor
Antenna Drive TG-114/TPN-8 interrupts the +28 volts to
runs at full speed.
the actuator motor when Antenna AS-1291/TPN-8
(6) In the search mode, relay K4011 is
linkage is driven to the proper position. The output of 35-
restored by the contacts of operated relay K4007,
degree el synchro B503 (azimuth drive signal) is
removing the 400-Hz power from elevation drive motor
connected to the electronic control preamplifier through
B501. The contacts of operated relay K4007 couple the
dropping resistor R4057, through the contacts of
search rpm signal to the electronic control preamplifier.
operated 35 EL relay K4006, and the contacts of
When tilt-servo ANTENNA switch S602 on Control-
restored relay K4010 and relay K4009. Relay K4006
Indicator C-6988/ TPN-18 is operated to LEFT, relay
also couples the 30-degree azimuth reference shift
K4001 is operated and its contacts supply +28 volts to
signal from 30 AZ OFFSET control R4062 to the
the left winding of the servo actuator on Antenna
electronic control preamplifier.
(4) In the 60-degree az mode, relays K4005
2-28
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