TM 11-5840-281-35/1
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
8 As last indicated-------------------
As last indicated ----------------
a.
a.
Disconnect radar test set and
None.
oscilloscope.
b.
b.
On right side of elevation An-
None.
tenna Drive TG-114/TPN-8,
remove waveguide-to-coaxial
adapter from rotary coupler.
c.
c.
Connect elevation difference
None.
channel waveguide to right
rotary coupler.
d.
d.
Remove clinometer from ele-
None.
vation Antenna AS-1291/TPN
-8 and remove tee adapter
UG-274/U from TP211 on
radar transmitter.
NOTE. Do not replace covers
on Radar Receiver-Transmitter
RT-818/TPN-18 until test are
completed.
4-11.
Testing Sensitivity Time
Control
(1) Radar Set AN/TPN-18 turned on,
aligned, and tuned.
(2) Front and rear covers removed from
a.
Test Equipment Required.
Radar Receiver-Transmitter RT-818/TPN-18.
(1) Multimeter ME-26A/U (vtvm)
NOTE
(2) Radar Test Set AN/UPM-56 (radar test
In the test procedure column of the chart below, the
set).
oscilloscope pulse will be seen on the trace only when the
(3) Oscilloscope AN/USM-140B (oscillo-
elevation and azimuth condition is obtained by the proper
scope).
positioning of the antennas.
b.
Equipment Conditions.
c.
Procedure.
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
Radar Receiver-
a.
a.
1
Oscilloscope
Connect oscilloscope CHAN-
None.
POWER: ON
Transmitter RT-81 8/
NEL A INPUT test prod to
HORIZONTAL POSI-
DET VIDEO testpoint TP801
TPN-18 control panel
TION: Midposition
on Intermediate Frequency
SCAN: OFF
HORIZONTAL DIS-
Amplifier AM-8339/TPN-8.
HV: OFF
PLAY INTERNAL
b.
b.
Connect test cable between
None.
MAIN POWER: ON
SWEEP MAGNI-
trigger INPUT connector on
Master Pulse Generator
FIER: XI
oscilloscope and PRE
O-1333/TPN-18
HORIZONTAL SWEEP
TRIGGER testpoint TP211
SCAN MODE: NORM
EXTERNAL VER-
on radar transmitter. Use tee
SCAN: OFF
NIER: CAL
adapter UG-274/U at TP211.
Master Control-Indicator
SWEEP TIME MILLI-
c.
c.
Connect calibrated rf test
None.
C-6988/TPN-18
SECONDS/CM: 0.1
cable
FOCUS: Fully ccw
SWEEP TIME VER-
(part of radar test set)
INTENSITY: Fully ccw
NIER: CAL
between
POWER: ON
TRIGGER SLOPE:
RF POWER connector on
IF GAIN-AZ: Fully cw
As required
radar test set and azimuth
IF GAIN-EL: Fully cw
TRIGGER LEVEL:
directional coupler MP3521
FTC: OFF
As required
on
d.
None.
STC: OFF
SWEEP MODE:
side of Radar Receiver-Trans-
PRESET
mitter RT418/TPN-18.
TRIGGER SOURCE:
d.
Connect test cable between
EXT AC
SYNC IN connector on radar
Vertical presentation:
test set and tee adapter UG-
274/U installed on PRE
TRIGGER testpoint TP211 on
radar transmitter.
4-21
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