MIL-DTL-55288E
3.7.3 Immersion (see 4.7.3). The equipment shall show no evidence of leakage after being immersed in three feet
of water for two hours. The antenna shall meet the requirements of 3.8.4.3 after the immersion test.
3.7.4 Vibration.
3.7.4.1 Vibration; internal, Matching Unit-Base, Antenna MX-6707/VRC (see 4.7.4.1). When vibrated in
accordance with 4.7.41, The amplitude of any part, subassembly or structural member of the antenna base assembly
shall not exceed twice the amplitude of the vibration applied to the assembly at any frequency between 10 and 55
cycles per second.
3.7.4.2 Vibration, whip assembly (see 4.7.4.2). The whip assembly shall be capable of being vibrated at the
natural frequency which produces the greatest amplitude for a period of 2 hours without electrical or mechanical
failure.
3.7.5 Bounce and shock. The equipment shall be capable of meeting the requirements of table I.
TABLE I. Bounce and shock.
Requirement paragraph
Inspection paragraph
Performance after test
Bounce
Specified performance 1/
No physical damage.
Specified performance 1/
Shock ballistic
No physical damage.
1/ The equipment shall meet specified performance for the following requirements: Base assembly resonance
3.7.6 Impact (see 4.7.7). The antenna shall be capable of meeting the requirements of 3.8.1, 3.8.2.1 and 3.8.4
after subjection to the test of 4.7.7. Physical damage, if any, shall be limited to minor surface abrasions at the impact
point, no deeper than .005 inch (0.13 mm).
3.7.7 Flexibility (see 4.7.8). The antenna shall withstand the flexing tests of 4.7.8 without electrical or mechanical
damage.
3.7.8 Fungus (see 4.7.9). The antenna, with matching unit case (SM-D-542066) open, shall provide no fungus
nutrients in the material, coating or contaminant form and shall not support fungal growth when tested. After being
tested, the antenna shall show no more than six unrelated spots, each no greater than .015 square inch in area, of
microbial growth (see 6.10.3) as evidenced by growth colonization (which includes branching and sporulation on or
within each cubic foot, or fraction thereof, of antenna volume. Isolated instances of partial tubular germination shall
not be included in this evaluation.
3.7.9 Salt fog (see 4.7.10). Equipment and assemblies shall show no evidence of corrosion as evidenced by any
visible degradation that can be attributed to flaky, pitted, blistered or otherwise loosened finish or metal surface and
shall meet specified performance for the following requirements: Whip measurements (see 3.8.4) and base
assembly resonance (see 3.8.1).
3.7.10 Rain (see 4.7.11). The Antenna Matching Unit Base MX-6707/VRC when exposed to wind driven rain and
high pressure washing hoses in accordance with 4.7.11 shall show no evidence of leakage.
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