MIL-PRF-55359A(CR)
e. The test item shall be vibrated along each axis in accordance with the test levels and
frequencies of figure 4. The test time shall be three hours (less dwell time) along each of the three
mutually perpendicular axes. The frequency of applied vibration shall be swept logarathmically
over the range shown on figure 4. The sweep time from the lowest frequency on figure 4 to the
highest frequency on figure 4 and then back to the lowest frequency on figure 4 shall be 36
minutes.
f. Remove the antenna from the vibration machine and install it on the ground plane of
figure 3.
g. Perform the VSWR test in accordance with 4.5.2, and record the results. Compare the
results with those obtained in step a. Any significant change in VSWR shall be considered to be a
failure of the vibration test.
4.6.4 Shock test. The following equipment shock test MIL-STD-810, Method 516.1 may
be used as a guide. At the completion of the test, the VSWR performance test of 4.5.2 shall be
performed (see 3.10.4).
4.6.5 Acceleration test. The unit shall be tested in accordance with the following
procedure. MIL-STD-810, Method 513.1 may be used as a guide. The contractor may, at his
option, propose an alternate procedure to accomplish the same purpose.
a. Install the antenna on the ground plane described in figure 3.
b. Perform the VSWR test in accordance with 4.5.2, and record the data.
c. Remove the antenna from the ground plane.
d. Install the antenna on an appropriate centrifuge by its normal mounting means, with the
long dimension along a radius of the centrifuge. The centrifuge rotational speed and the distance
of the center of the antenna from the rotational center of the centrifuge shall be adjusted to
provide an acceleration of 6G. If the end of the antenna nearest to the rotational center of the
centrifuge has an acceleration of less than 90 percent of this G level, move the antenna farther out
on the radius, and compensate by reducing the speed of rotation. If the end of the antenna
farthest way from the rotational center of the centrifuge has an acceleration of more than 110
percent of this G level, move the antenna farther out on the radius, and compensate by reducing
the speed of rotation.
e. Operate the centrifuge for one minute to provide an acceleration of 6G at the center of
the antenna.
f. Repeat the test using the same acceleration level, along each of three mutually
perpendicular axes in two opposite directions for a period of one minute in each direction for a
total of 6 tests.
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