TM 11-5840-281-35/1
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
b.
b.
On elevation or azimuth elec-
None.
tronic filter, connect vtvm
COMMON test lead to GRD
testpoint TP701.
c.
c.
On sensitivity time control (stc)
None.
unit, connect vtvm DC test
lead to SUM GAIN testpoint
TP3902.
d.
d.
Observe indication on vtvm
-0.2v min, +0.1v max.
(azimuth condition).
e.
e.
Disconnect vtvm DC test lead
None.
from SUM GAIN testpoint
TP3902 and connect to DIFF
GAIN testpoint TP3908.
f.
f.
Observe Indication on vtvm
-0.2v min, +0.1v max.
(elevation condition).
g.
g.
Disconnect vtvm test leads ---
None.
4
As last indicated, except:
As last indicated except:
a.
a.
On radar test set, adjust RF
None.
Radar test set
Master Control/lndicator
TUNING control for max pulse
C-4988/TPN-18
Rf power switch:
amplitude on oscilloscope.
POWER SET
STC: ON
Maintain amplitude of pulse be-
Function switch:
low limiting level by adjusting
PULSE-EXT
OUTPUT ATTEN. control on
SYNC: (-)
radar test et.
PULSE DELAY:
b. On oscilloscope, adjust HORI-
b.
None.
As required
ZONTAL POSITION control
PULSE LENGTH:
10 (sec)
to position start of oscilloscope
sweep at far left vertical grid
PULSE DELAY:
line.
20 (sec)
700 sec
c. Measure time after start of
c.
OUTPUT ATTEN:
(approximately)
30 dbm
weep to point on sweep that
receiver noise is gated off.
5
As last indicated except:
As last indicated --------------
a.
a.
Disconnect oscilloscope CHAN-
None.
Oscilloscope
NEL A INPUT test prod
CHANNEL A SENSI-
from Intermediate Frequency
TIVITY (VOLTS/
Amplifier AM-83389/TPN-8 and
CM): 2
connect to SUM GAIN test-
point TPS902 on stc unit.
b. Record peak-to-peak amplitude
b.
Peak-to-peak amplitude
of sum channel stc waveform as
of sum channel stc
wave-
indicated on oscilloscope
form indicated on oscillo-
oscilloscope-
(azimuth condition).
scope.
e.
e.
On stc unit, disconnect CHAN-
None.
NEL A INPUT test prod from
SUM GAIN testpoint TP8902
and connect to DIFF GAIN
testpoint TP8908 (in elevation
portion of scan).
d.
d.
Measure peak-to-peak amplitude
One-half of sum channel
of difference channel etc wave-
stc waveform peak-to-
form as indicated on oscillo-
peak amplitude recorded
6
As lit indicated, except:
As last indicated --------------
scope.
in b above.
Oscilloscope
a.
a.
Disconnect oscilloscope CHAN-
None.
CHANNEL A SENSI-
NEL A INPUT test prod from
TIVITY (VOLTS/
stc unit and connect to DET
CM): .5
VIDEO testpoint TP801 on
SWEEP TIME MICRO-
Intermediate Frequency Ampli-
fier AM-3339/TPN-8.
4-23
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