TM 11-5840-281-35/1
Control settings
Step No. Test equipment Equipment under test
Test procedure
Performance standard
i. None.
i. Adjust OUTPUT ATTEN. con-
trol until power meter indicate
O dbm (PWR SET).
j. None.
j. Rotate OUTPUT ATTEN. con-
trol cursor until cursor index
mark aligns with red mark
(PWR SET) on OUTPUT
ATTEN. control dial.
k. None
k. Alternately place function
switch to OFF and CW. Power
meter indication should be
ZERO SET in OFF, and 0 dbm
(PWR SET) in CW. If neces-
sary, readjust ZERO SET con-
trol (function switch placed to
OFF) and OUTPUT ATTEN.
control (function switch placed
to CW) as required.
NOTE. Radar test set calibra-
tion must be checked by perform-
ing g through k above if frequency
of radar test set is changed.
a. None
3 As last indicated, except: As last
a. On radar test set, adjust RF
indicated -------
TUNING control for max
Radar test set
pulse amplitude on oscillo-
Rf power switch:
scope. Maintain amplitude of
POWER SET
pulse below limiting level by
Function switch:
adjusting OUTPUT ATTEN.
PULSE-EXT SYNC(-)
control on radar test nt.
b. None
PULSE DELAY: As
b. Adjust PULSE DELAY control
required.
until pulse is approximately
PULSE LENGTH:
centered on oscilloscope.
4 (sec)
c. Rotate OUTPUT ATTEN.
control cw until pulse on
oscilloscope just begins to
limit (further rotation in cw
direction no longer cause
pulse amplitude to increase).
d. None.
d. On master Control-Indicator
C-6988/TPN-18, place
TRANSMITTER switch to
WIDE (but not through
WIDE to HV ON). Observe
that HV ON indicator is
extinguished.
0.2v peak (nom).
4 As last indicated, except: As last
Measure amplitude of receiver
indicated
noise on oscilloscope.
Oscilloscope
CHANNEL A SENSI-
TIVITY VERNIER
(VOLTS/CM): .1
a. None.
a. Disconnect CHANNEL A
5 As last indicated ----
As last indicated -
INPUT test prod from DET
VIDEO testpoint TP801 and
connect to FTC VIDEO
testpoint TP1409 on video
b. None.
amplifier.
b. On master Control-Indicator
c. Positive trailing edge of
C-6988/TPN-18, place FTC
cancelled pulse is clipped
switch to ON.
at baseline level.
c. On oscilloscope, observe posi-
tive trailing edge of cancelled
pulse.
4-14
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