TM 11-5840-281-35/1
Control settings
Step No. Test equipment Equipment under test
Test procedure
Performance standard
d. None.
d. Connect test cable between
TRIGGER LEVEL: As
SYNC IN connector on radar
required
test set and tee adapter UG-
SWEEP MODE: PRESET
274/U installed on PRE TRIGO-
TRIGGER SOURCE:
GER testpoint TP211 on Radar
EXT AC
Receiver Transmitter RT-818/
Vertical presentation:
TPN-18.
CHANNEL A
e. 0.6 ma min, 1.0 ma max.
e. On Radar Receiver-Transmitter
CHANNEL A SENSI-
RT-18/TPN-18 control
TIVITY, (VOLTS/
panel, place XTAL CUR switch
CM): .05
to SUM 1, SUM 2, DIPF 1,
CHANNEL A SENSI-
and DIFF 2, while observing
TIVITY VERNIER:
XTAL CUR meter.
CALIBRATED
f. None.
f. On master Control-Indicator
CHANNEL A AC-DC:
C-6988/TPN-18, place
DC
TRANSMITTER switch to
Radar test set
WIDE (but not through WIDE
POWER: ON
to HV ON).
Rf power switch: POWER
g. 0.2v peak (1 cm).
g. On oscilloscope, observe receiver
SET
noise level.
Function switch: OFF
h. None.
h. On master Control-Indicator C-
RF TUNING: Operating
6988/TPN-18, place TRANS-
MITTER switch to NARROW
(but not through NARROW to
HV ON).
i. 0.2v peak (1 cm).
i. On oscilloscope, observe receiver
noise level.
a. None.
a. On radar test set, adjust
3 As last indicated ----As last indicated ----
ZERO SET control for ZERO
SET indication on power meter.
b. None.
b. Place function switch to INT
FM.
c. None.
c. Rotate FM AMPLITUDE
control fully cw (100).
d. Non.
d. Set ADD TO PWR. METER
control to 0 DB (PWR SET).
e. None
e. Rotate OUTPUT ATTEN.
control fully cw.
f. None.
f. Rotate RF TRIMMER control
until deflection of power meter
needle is observed.
g. None.
g. Place function witch to CW.
h. None.
h. Adjust RF TRIMMER and
REFLECTOR controls for ms
indication on power meter.
Maintain power meter indic-
tion below half-scale by adjust
ing OUTPUT ATTEN. control
ccw.
i. Adjust OUTPUT ATTEN.
i. None.
control until power meter indi-
ates 0 dbm (PWR SET).
j. None.
j. Rotate OUTPUT ATTEN.
control cursor until cursor index
mark aligns with red mark
(PWR SET) on OUTPUT
ATTEN. control dial.
k. Alternately place function
k. None.
switch to OFF and CW. Power
meter indication should be
ZERO SET in OFF, and 0 dbm
4-11
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