MIL-DTL-4946E
4.6 Methods of examination and test.
4.6.1 Visual and mechanical examination. The antenna shall be examined to verify that the design, construction,
physical dimensions, weight, finishing, color, input connector, marking, and workmanship are in accordance with the
4.6.2 Electrical test. Each electrical component shall be given a continuity test to ascertain that it
is wired and connected correctly and that good electrical contact is obtained (see 3.2.3).
4.6.3 Performance.
4.6.3.1 Gain. The gain of the antenna shall be computed by the comparison of a received signal strength from the
test antenna to the received signal strength from a standard half-wave dipole antenna. Measurements shall be made
with appropriate test equipment at 225, 310, and 400 MHz (see 3.5.1).
4.6.3.2 VSWR. The VSWR of the antenna shall be determined by the slotted line method, UHF bridge method, or
a method approved by the contracting agency. Measurements shall be made at both extreme frequencies and at
least three other evenly spaced frequencies within the operating frequency range. The values shall not exceed that
specified (see 3.5.2).
4.6.3.3 Impedance. The impedance of the antenna shall be measured by one of the methods for
measuring VSWR (see 3.5.3).
4.6.3.4 Radiation pattern. The radiation pattern shall be determined by the use of a "field-strength" or pattern
measuring system, or other method acceptable to the procuring agency (see 3.5.4).
4.6.3.5 Frequency range. The frequency range requirements shall have been met if the antenna meets the
requirements for gain, VSWR and power capability at the frequencies specified (see 3.5.5).
4.6.3.6 Power capability. Maximum power shall be applied to the antenna for a period of 2 minutes from a
transmitter designed to operate with such an antenna, without malfunction of, or damage to, the antenna (see 3.5.6).
4.6.4 Environmental tests. The antenna shall be subjected to the following environmental conditions in
accordance with MIL-STD-810, with the following exceptions, without deterioration of quality or performance (see
3.5.7). After each environmental test, the continuity and VSWR shall be checked in accordance with 4.6.2 and
4.6.4.1 Fungus. The antenna shall be subjected to the fungus test in accordance with method 508,
procedure I. A certified statement by the contractor that all materials are non-nutrient will be acceptable in lieu of this
test.
4.6.4.2 Sand and dust. The antenna shall be subjected to the sand and dust test in accordance with
method 510, procedure I.
4.6.4.3 High temperature. The antenna shall be subjected to the high temperature test in accordance with method
501, procedure I, except the temperature shall be held at 71°C (160°F) for 4 hours and then at 52°C (126°F) for 20
hours in lieu of 48 hours at 71°C (160°F).
4.6.4.4 Low temperature. The antenna shall be subjected to the low temperature test in accordance with method
502, procedure I.
4.6.4.5 Humidity. The antenna shall be subjected to the low temperature test in accordance with method 507,
procedure I.
4.6.4.6 Low pressure. The antenna shall be subjected to the low pressure test in accordance with method 500,
procedure I.
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