TM 11-6625-2398-15-3
Step
Test equipment
Equipment under
Test
Performance
No.
control setting
test control settings
procedure
standard
2
IM-92/U
None
a. Terminate and connect the
as directed in pro-
hybrid attenuator as directed in A of
cedure.
AN/UPM-108A
b. Insert the crystal in the rf de-
VERNIER GAIN:
tector of the coaxial slotted line and
as directed in pro-
and turn the probe depth control
cedure.
fully clockwise. Adjust the coaxial
SG-340/G
slotted line tuning knob for a max-
OUTPUT LEVEL:
imum indication on the meter of the
as directed in pro-
standing wave ratio indicator.
cedure.
PUT LEVEL control for a centered
reading on the meter of the standing
wave ratio indicator.
d. Move the carriage of the coaxial
slotted line, with the drive control to
obtain a peak (maximum) meter reading
on the standing wave ratio indicator.
e.
AN/UPM-108A
e. Decrease the probe depth (turn
RANGE:
control counterclockwise), while ad-
As required for
justing the VERNIER GAIN control
meter reading.
and RANGE switch of the standing
wave ratio indicator, to the minimum
probe depth required to provide full
scale deflection on the meter of the
standing wave ratio indicator (consistent
with a usable meter reading, free of
noise and jitter).
f. Readjust the drive control knob of the
coaxial slotted line for the peak (maximum)
reading on the standing wave ratio
indicator meter. Adjust the VERNIER
GAIN control of the standing wave ratio
indicator for a meter reading of exactly 1
on the SWR scale.
g. Move the carriage of the coaxial
Standing wave ratio
slotted line, with the drive knob, to
indicator must indicate
obtain a null (minimum) reading on
less than 1.65 on
the meter of the standing wave ratio
the SWR scale.
on the SWR scale (top) of the stand-
ing wave ratio indicator.
3
Controls as at end of
None
a. Terminate and connect the
step 1.
hybrid attenuator as directed in B of
IM-92/U
As directed in step 2.
b. Repeat b through g of step 2.
Standing wave ratio
AN/UPM-108A
indicator must indicate
VERNIER GAIN and
less than 1.2 on
RANGE:
the SWR scale.
As directed in step 2.
SG-340/G
OUTPUT LEVEL:
None
a. Terminate and connect the
As directed in step 2.
hybrid attenuator as directed in C of
4
Controls as at end of
step 1.
b. Repeat b through g of step 2.
Standing wave ratio
IM-92/U
indicator must indicate
As directed in step 2.
less than 1.5 on
AN/UPM-108A
the SWR scale.
VERNIER GAIN and
RANGE:
As directed in step 2.
8-21
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