TM 11-5840-281-35/1
Control settings
Step No. Test equipment Equipment under test
Test procedure
Performance standard
a. None.
a. On video amplifier, disconnect
6 A last indicated, except: As last
CHANNEL A INPUT test
indicated ---------------------------------------------
Oscilloscope
prod from FTC VIDEO test-
point TP1403 and connect to
CHANNEL A SENSI-
VIDEO OUT testpoint
TIVITY, VERNIER
TP1404.
(VOLTS/CM): 0.1
b. 1.5v peak min, 2.2v
b. On oscilloscope, measure am-
peak max.
plitude of pulse.
c. 0.5v peak (nominal)
c. Measure amplitude of receiver
noise.
d. None.
d. Establish 0-vdc reference on
oscilloscope by adjusting
CHANNEL A VERTICAL
POSITION control to position
baseline on central horizontal
grid line with CHANNEL A
INPUT test prod wax con-
nector removed from oscillo-
scope. Reconnect CHANNEL
A INPUT test prod connector
to oscilloscope.
e. 0 vdc.
e. Measure dc level of baseline
by comparing vertical position
of baseline to center grid line.
f. None.
f. On radar test set, rotate OUT-
PUT ATTEN. control ccw
until pulse is barely visible
in noise on oscilloscope (re-
ceiver mds).
g. 1.5 v peak min, 2.2v
g. Adjust OUTPUT ATTEN.
peak max.
control cw until pulse on oscil-
loscope just begins to limit.
Measure pulse amplitude.
a. None.
a. On master Control-Indicator
C-6988/TPN-18 place
7 As last indicated, except: A lost
TRANSMITTER switch to
indicated ---------------------------------------------
NARROW (but not through
Oscilloscope
NARROW to HV ON). Ob-
SENSITIVITY,
serve that HV ON indicator
VERNIER
is extinguished.
(VOLTS/CM): .1
b. 1.5v peak min, 2.2v
b. On oscilloscope, measure ampli-
peak max.
tude of pulse.
a. 0.5v peak (nominal).
a. On oscilloscope, measure
amplitude of receiver noise.
b. None.
b. Establish 0-vdc reference as
8 As last indicated, except: As last
step 8d above.
indicated
c. 0 vdc.
c. Measure dc level of baseline ---
Oscilloscope
d. None.
d. On radar test set, rotate OUT-
CHAELNNEL A SENSI-
PUT ATTEN. control ccw
TIVITY VERNIER
until pulse is barely visible in
(VOLTS/CM): .1
noise on oscilloscope (receiver
mds).
e. Baseline remains at 0
e. On radar test set, rotate OUT-
vdc while output of
PUT ATTEN. control back
radar test set is varied
and forth between mds level
over range from mds
and mds plus 50-dbm level
level to mds plus 50-
while observing cancelled pulse
dbm level.
on oscilloscope.
f. None.
f. Disconnect radar test set and
oscilloscope.
NOTE. Do not replace covers
on Radar Receiver-Transmitter
RT-818/TPN-18 until tests are
completed.
4-15
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