TM 11-5840-281-35/1
(7) Set ANGLE VOLTS control to indicate
NOTE
200 on dial.
(8) Momentarily place ANGLE VOLTS
This procedure calibrates the ANGLE VOLTS
switch to OPERATE and observe position of elevation
control on Pulse6 Generators O-1333/TPN-18
sweep on cathode ray tube. Return ANGLE VOLTS
for 10 dial divisions for each degree of azimuth
switch to EL.
scan and 20 dial divisions for each degree of
(9) On right side of Pulse Generators 0-
elevation scan. The ANGLE VOLTS control
1333/TPN-18, adjust ART EL CAL control R1101 to
settings for cursor alignments (TM 11-5840-281-
superimpose artificial sweep on elevation sweep.
12, para 2-32 and 2-33) must be checked for
Momentarily place ANGLE VOLTS switch to OPERATE
accuracy after each calibration of the ANGLE
as required to observe position of elevation sweep.
VOLTS control. The ANGLE VOLTS control on
(10) On Pulse Generators O-1333/TPN-18,
both Control-Indicators C-6988/TPN-18 may be
place ANGLE VOLTS switch to AZ.
calibrated simultaneously, reducing the number
(11) Rotate azimuth Antenna AS-1292/
of times elevation Antenna AS-1291/TPN-8 and
TPN-8 by hand to scan angle of 0 degrees as indicated
azimuth Antenna AS-1292/TPN-8 must be
on azimuth scan protractor. Maintain this scan angle
positioned.
while performing (13) through (15) below.
(12) Manually position elevation Antenna
c. Procedure.
AS-1291/TPN-8 to the scan bottom to produce an
(1) On Pulse Generator 0-1333/TPN-18,
azimuth sweep on crt.
rotate ANGLE VOLTS control fully ccw. Observe that
(13) Set ANGLE VOLTS control to indicate
dial on ANGLE VOLTS control indicates 0.
150 on dial.
(2) If ANGLE VOLTS control dial does not
(14) Momentarily place ANGLE VOLTS
indicate 0, loosen two setscrews in ANGLE VOLTS
switch to OPERATE and observe position of azimuth
control dial and remove dial from control.
sweep on cathode ray tube. Return ANGLE VOLTS
Rotate shaft of ANGLE VOLTS control fully ccw.
switch to AZ.
Set dial to 0 and carefully position dial on shaft.
(15) On right side of Pulse Generator O-
Tighten two setscrews.
1883/TPN-18, adjust ART AZ CAL control R1103 to
(3) Attach clinometer to elevation Antenna
superimpose artificial sweep on azimuth sweep.
AS-1291/TPN-8.
Momentarily place ANGLE VOLTS switch to OPERATE
as required to observe position of azimuth sweep.
NOTE
(16) Push in Pulse Generators 0-1333/
TPN-18 and secure with two knurled front panel screws.
Elevation Antenna AS-1291/TPN-8 and azimuth
(17) Remove clinometer from elevation
Antenna AS-1292/TPN-8 may be positioned by
Antenna AS-1291/TPN-8.
hand in NORM scan mode by rotating knurled
end of elevation Antenna Drive TG-114/TPN-8
3-38. Fixed Coil Amplifier Alignment
drivemotor shaft located under cover on right
side of elevation Antenna Drive TG-114/TPN-8
(as viewed from front of Radar Receiver-
a. Test Equipment Required. Multimeter ME-
Transmitter RT-818/TPN-18).
26A/U (vtvm).
(4) Position elevation Antenna AS-1291/ TPN-8 to
b. Equipment Conditions and Connections.
scan angle of +9 degrees as indicated on
(1) On master Control-Indicator C-6988/
clinometer. Maintain this scan angle while per-
TPN-18, POWER circuit breaker placed to OFF.
forming (6) through (9) below.
(2) Rear cover of applicable Control-
(5) Manually position azimuth Antenna
Indicator C-6988/TPN-18 removed for access to fixed
AS1292/TPN-8 to a scan angle of greater than 25
coil
amplifier
and
controls.
degrees to produce an elevation sweep on crt.
(6) Loosen two knurled front panel screws
and pull out Pulse Generators O-1333/TPN-18 for
access to right side of Pulse Generators O-188/TPN-18.
3-47
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