TM 11-5840-281-35/1
(12) On Pulse Generator O-1333/TPN-18
trol R4520 to position 20-mile range mark 1/2 inch from
front panel, place SCAN MODE switch to 35 EL, and set
right edge of display.
ANGE VOLTS control to 720.
(26) On Pulse Generator O-1333/TPN-18
(13) On top deck of Pulse Generator O-
front panel, place RANGE MILES switch to 40.
1333/TPN-18, adjust EXP-EL 35 control R1135 to
Observe that 40-mile range mark is visible. If not, adjust
position sweep trace under top gridline of overlay.
SWEEP GATE LENGTH control R4503 on sweep
(14) On Pulse Generator O-1333/TPN-18
generator until sweep terminates slightly beyond 40-mile
front panel, place SCAN MODE switch to NORM and
range mark.
ANGLE VOLTS switch to AZ.
(15) Set ANGLE VOLTS control to 300.
NOTE
(16) On top deck of Pulse Generator O-
1333/TPN-18, adjust EXP-AZ 30 control R1117 to
Do not push in Pulse Generator 0-1333/TPN-18
position sweep trace /8 inch below center gridline of
until alignments are completed.
overlay.
(17) On Pulse Generator O-1333/TPN-18
3-43. Azimuth-Elevation Tilt and Servo Alignment
front panel, place SCAN MODE switch to 600 AZ and set
ANGLE VOLTS control to 600.
Refer to TM 11-5840-281-12, paragraph 235 for the
(18) On top deck of Pulse Generator O-
alignment procedure for the azimuth tilt and elevation
1333/TPN-18, adjust EXP-AZ 60 control R1118 to
servo.
position sweep trace 1/8 inch below center gridline of
overlay.
3-44. Cursor Sawtooth Generator and Comparator
(19) On Pulse Generator O-1333/TPN-18
Alignment
front panel, place RANGE MILES switch to 10 and SCAN
switch to ON.
(20) On master Control-Indicator C-6988/
a. Test Equipment Required. Oscilloscope AN/
TPN-18, place TRANSMITTER switch through WIDE to
USM-140B (oscilloscope).
HV ON and identify video return on azimuth display from
b. Equipment Conditions and Connections.
touchdown target reflector.
(1) Radar Set AN/TPN-18 turned on.
(2) On master Pulse Generator 0-1333/
NOTE
TPN-18, place SCAN MODE switch placed to NORM,
SCAN switch OFF, EL CURSOR switch placed to HF,
Determine which position of CURSOR SELECT
and ANGLE VOLTS switch placed to EL.
switch (position 1 or position 2) is applicable to
(3) At front of applicable Control-Indicator
present operation before performing (21) below.
C-6988/TPN-18, Pulse Generator 0-1333/ TPN-18 pulled
out for access to top deck.
(21) On top deck of Pulse Generator O-
(4) Rear cover removed from applicable
1333/TPN-18, ensure that CURSOR SELECT switch is
Control-Indicator C-6988/TPN-18 for access to mixer
placed to select appropriate cursor.
amplifier.
(22) Adjust PREC DELAY control (PREC
(5) Oscilloscope connected as shown in
DELAY 1 R1120 or PREC DELAY 2 R1119, depending
on position of CURSOR SELECT switch) until touchdown
c. Procedure.
range mark is just visible at start of weep.
(1) On oscilloscope, place controls to
(23) On sweep generator (located in Pulse
positions indicated in (a) through (n) below.
Generator O-1333/TPN-18) adjust 5, 10 PREC EXP
(a) POWER: ON.
control R4521 to position 10-mile range mark 1/2 inch
(b) SWEEP MODE: PRESET.
from right edge of display.
(c) TRIGGER SOURCE: EXT AC.
(24) On Pulse Generator 0-1333/TPN-18
(d) HORIZONTAL DISPLAY: X2.
front panel, place RANGE MILES switch to 20.
(e) EXTERNAL VERNIER: CAL.
(25) On top deck of Pulse Generator 0-
(f) SWEEP TIME MILLISECONDS/
1333/TPN-18, adjust 20, 40 PREC EXP con-
CM
:.2
3-51
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