TM 11-5840-281-35/1
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
b.
b.
SECONDS/CM: 20
On radar test set, adjust
None.
Radar test set
PULSE DELAY control until
pulse appears on oscilloscope
PULSE LENGTH:
120 ,sec (6 cm) after start of
4 (sec)
sweep (in azimuth portion of
scan).
c.
c.
On radar test set, adjust OUT-
None.
PUT ATTEN. control until
pulse amplitude is at receiver
noise level on oscilloscope.
d.
d.
Note OUTPUT ATTEN. con-
Dbm setting on OUT-
trol dial dbm setting.
PUT ATTEN. control
dial.
e.
e.
Rotate OUTPUT ATTEN. con-
None.
trol cw until setting on OUT-
PUT ATTEN. control dial is
10 dbm less than dbm setting
noted in d above.
f.
f.
Record OUTPUT ATTEN.
Dbm setting on OUT-
control dial dbm setting.
PUT ATTEN. control
dial.
g.
g.
On oscilloscope, adjust CHAN-
None.
NEL A SENSITIVITY and
CHANNEL A SENSITIVITY
VERNIER controls to obtain
pulse amplitude of 1 cm on
oscilloscope.
h.
h.
On radar test set, adjust
None.
PULSE DELAY control until
pulse appears 30 sec after
start of sweep on oscilloscope
(12 cm).
i.
i.
On radar test set, rotate OUT-
None.
PUT ATTEN. control cw until
pulse amplitude on oscilloscope
is again 1 cm.
j.
j.
Record OUTPUT ATTEN.
Dbm setting on OUT-
control dial dbm setting.
PUT ATTEN. control
dial.
k.
k.
Determine stc slope by sub-
22 dbm max, 18 dbm
tracting dbm setting recorded
min.
in j above from dbm setting
recorded in f above.
7
As last indicated ------------
As last indicated --------------
a.
a.
On master Control-Indicator
Amplitude of pulse on
C-6988/TPN-18, place STC
oscilloscope increases.
switch to OFF.
b.
Rotate IF GAIN-AZ control
b.
Pulse and receiver noise
fully ccw.
on oscilloscope dis-
appear.
c.
c.
Connect CHANNEL A probe
None.
to DIFF GAIN testpoint
TP3903 on stc card.
8
As last indicated, except: -
As last indicated, except:
a.
a.
Position elevation Antenna
Pulse and receiver noise
Radar test set: OUT
Master Control-Indicator
AS-1291, TPN-8 by hand to
appear on oscilloscope.
PUT ATTEN:
C-6988,TPN-18
approximately midscan (eleva-
0 (dbm)
EL TARGET: Fully
tion condition).
ccw
b. On master Control-Indicator
b.
Pulse and receiver noise
C-6988. TPN-18, rotate EL
amplitude on
oscilloscope
TARGET control fully cw.
decreases (some de
level
shifts).
4-24
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