MIL-DTL-5815H
3.4 Material and finish. Material shall be as specified herein (see 3.1). Where a definite material is not specified,
materials and finish used on construction of the antenna shall resist erosion of surfaces due to action of rain, ice
crystals and other impinging particles at velocities as specified (see 3.1). Acceptance or approval of any constituent
material shall not be construed as a guarantee of acceptance of the finished product.
3.4.1 Non-flammable material. Material shall be nonflammable.
3.4.2 Fungus. All materials shall be inert or fungus resistant in accordance with ASTM-G21.
3.4.3 Dissimilar metals. Unless suitably protected against electrolytic corrosion, dissimilar metals as defined in
MIL-STD-889 shall not be in intimate contact.
3.4.4 Pure tin. The use of pure tin, as an under plate or final finish, is prohibited both internally and externally. Tin
content of antenna components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a
minimum of 3 percent lead, by mass (see 6.4).
3.5 Design and construction. Antenna shall be of the design, construction, and physical dimensions specified
(see 3.1). Reinforcing the antenna by wrapping it with tapes or cloths that protrude outside the allowed antenna
envelope is prohibited.
3.5.1 Connectors. The connectors shall be as specified (see 3.1). The material and gauging for the connectors
shall conform to the requirements of the applicable specification.
3.5.1.1 Connector caps. All connectors shall be sealed with push-on plastic caps to prevent both damage and the
entrance of moisture and foreign material during storage.
3.5.2 Screw threads. Screw threads shall be in accordance with FED-STD-H28.
3.5.3 Radiation power. The antenna shall be capable of handling the specified power (see 3.1), when subjected to
any combination of environmental conditions specified herein.
3.5.4 Weight. The weight shall not exceed the limits specified (see 3.1).
3.6 Frequency range. The antenna shall provide performance over the specified frequency range (see 3.1).
3.7 Impedance. When antennas are tested as specified in 4.7.2, the impedance at the antenna input connector
shall be such that the voltage standing wave ratio (VSWR), does not exceed the specified value (see 3.1).
3.8 Sampling probe impedance (when specified). When antennas are tested as specified in 4.7.3, the probe
impedance shall be as specified (see 3.1).
3.9 Sampling probe attenuation measurements (when specified). When antennas are tested as specified in 4.7.4,
the probe attenuation shall be as specified (see 3.1).
3.10 Radiation pattern. The antenna shall be designed for omnidirectional coverage. When the azimuthal
radiation patterns specified in 4.7.5a are taken, the region extending completely around the antenna in azimuth (∅)
shall, at each specified zenith angle (θ), be essentially omnidirectional with no nulls greater than 2 dB down from the
maximum. When the vertical (great-circle) radiation patterns specified in 4.7.5b are taken, the gain at each zenith
angle (θ) shall be no more than 1 dB below the gain of a matched quarter-wave stub antenna mounted in the same
location.
3.11 Polarization. When antennas are tested as specified in 4.7.6, the axial ratio of the polarization ellipse for the
test antenna in each of the specified test directions shall be equal to or greater than the axial ratio in the same
direction for a matched quarter-wave stub antenna mounted in the location of the test antenna.
3.12 Static load. When antennas are tested as specified in 4.7.7, the antenna shall be capable of withstanding the
specific static load (see 3.1).
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