TM 11-5840-281-35/1
Figure 2-20. Az-el angle waveforms.
volts. The two electronic filter outputs and the resultant
sembly in Pulse Generator 0-1333/TPN-18. The voltage
az-el angle voltage are illustrated in figure 2-20.
is also delivered to AZ TILT meter M601 on the front
h. Antenna Servo Actuator Circuit (fig. 7-8)
panel of Control-Indicator C-6988/ TPN-18 to provide a
visual indication of the azimuth tilt angle. Tilt data control
Identical servo actuators are associated with each
R9101 is mechanically aligned to produce -1 volt at its
antenna. The servo actuators adjust the servo position
wiper arm when Antenna AS-1292/TPN-8 is at its -1
of Antenna AS-1292/TPN-8 and Antenna AS-1291/TPN-
degree tilt limit.
8, and are controlled by ANTENNA switch S602 on the
(3) The elevation and the azimuth servo
front panel of Control-Indicator C-6988/TPN-18.
actuators are identical to the 10 to 35-degree elevation
(1) The servo actuator associated with
actuator associated with Antenna Drive TG-114/TPN-8,
Antenna AS-1291/TPN-8 positions the antenna in
with the exception of the additional tilt and servo data
azimuth between the limits of +15 degrees and -15
controls.
degrees. Servo data control R9101 is geared to the
i. Iff Antenna Control. Two synchros associated
actuator and delivers a dc voltage proportional to the
with the iff antenna pedestal are used in conjunction with
elevation servo angle to the az-el blanking pulse
synchro units in Radar Set AN/TPN-18 to perform two
generator subassembly in Pulse Generator O-1333/TPN-
functions: synchronize rotation of iff and radar set
18. Control R9101 is mechanically aligned to provide -1
antennas; and synchronize ppi sweep rotation with the iff
volt at its wiper arm when Antenna AS-1291/TPN-8 is at
its -15 degree limit. At the +15 degree servo limit, the
(1) The synchro control transformer in the
output is -22 volts.
iff pedestal receives stator voltage from differential
(2) The servo actuator associated with
synchro B601 in Control-Indicator C-6988/ TPN-18. An
Antenna AS-1292/TPN-8 positions the tilt angle between
error voltage developed in the rotor winding of the
the limits of -1 and +25 degrees.
Servo data
synchro control transformer is transmitted to Radar
potentiometer R9101 delivers a voltage proportional to
Receiver-Transmitter RT-818/TPN-18. The error voltage
the Antenna AS-1292/TPN-8 tilt angle to the az-el
is then routed through SCAN switch S106, restored
blanking pulse generator subas-
precision relay K101, and operated iff interlock relay
2-34
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