MIL-DTL-25707F
3.5.4 Vibration. When tested as specified in 4.5.7.3, the antenna shall meet the electrical requirements of 3.6.2 through 3.6.4.
3.5.5 Humidity. When tested as specified in 4.5.7.4, the antenna shall meet the electrical requirements of 3.6.2 through 3.6.4.
3.5.6 Fungus. When tested as specified in 4.5.7.5, the antenna shall meet the electrical requirements of 3.6.2 through 3.6.4.
3.5.7 Salt fog. When tested as specified in 4.5.7.6, the antenna shall meet the electrical requirements of 3.6.2 through 3.6.4.
3.6 Electrical requirements.
3.6.1 Frequency. The antenna shall provide performance over a specified radio frequency band in accordance with the
applicable specification sheet (see 3.1).
3.6.2 Voltage standing wave ratio (VSWR). When antennas are tested as specified in 4.5.2, the VSWR (as referenced to a
50 Ω system) at the antenna input shall be no greater than specified in the applicable specification sheet (see 3.1).
3.6.3 Sampling probe VSWR. When antennas are tested as specified in 4.5.3, the VSWR of the sampling probe shall be no
greater than specified (see 3.1).
3.6.4 Sampling probe attenuation. when antennas are tested as specified in 4.5.4, the sampling probe attenuation shall be no
greater than specified (see 3.1).
3.6.5 Radiation pattern. When tested as specified in 4.5.5, the gain of the antenna system in the region extending completely
around the antenna, in azimuth (Φ), shall, at each zenith angle (Θ), be essentially omnidirectional with nulls no greater than 2.0 dB
down from the maximum. The gain at all zenith angles from 70 degrees to 110 degrees shall not be more than 2.0 dB below the
gain of a matched quarter-wave stub antenna in the same location (see figure 1).
3.6.6 Polarization. When tested as specified in 4.5.6, the antenna shall transmit or receive vertically polarized signals. The axial
ratios of polarization ellipses in the specified directions shall be equal to or better than that obtained in each of the same directions
from a vertically polarized quarter-wave stub antenna at any frequency specified herein.
3.7 Weight. The weight of the antenna shall be in accordance with the applicable specification sheet (see 3.1).
3.8 Marking. Antenna shall be marked in accordance with MIL-STD-1285 as shown on the applicable specification sheet
(see 3.1) and will include the following minimum marking: Part or Identifying Number (PIN) (see 1.3), national stock number (NSN),
type number (if applicable), contract number, serial number, date code (year, month) and Manufacturer Code (FSCM).
Example: PIN M25707/1-01
NSN: 5985-XXX-XXXX (as applicable)
Type AT-740/A (if applicable)
Contract DLA XXXXXXXXXXXXX
Serial No. 1234
7701
12345
3.9 Maintainability. The antennas covered by this specification shall be considered as nonrepairable items, which, in the event
of failure, shall be replaced.
3.10 Workmanship. Workmanship must be in accordance with accepted industry practices.
4. VERIFICATION
4.1 Classification of inspections. The inspections specified herein are classified as follows:
a.
First article inspection (see 4.3).
Conformance inspection (see 4.4).
b.
4.2 Inspection conditions. Unless otherwise specified, herein all inspections shall be performed at temperature of 25°C ± 10°C,
barometric 650 to 800 millimeters of mercury, and relative humidity of 45 percent to 90 percent.
4.3 First article inspection. First article inspection shall be performed by the contractor, after award of contract and prior to
production, at a location acceptable to the Government. First article inspection shall be performed on sample units produced with
equipment and procedures normally used in production [see 6.2.c.(4)]. First article approval is valid only on the contract under
which it is granted, unless extended by the Government to other contracts.
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