MIL-DTL-25708F
3.5.8 Salt fog. When tested as specified in 4.5.7.8, the antenna shall meet the electrical requirements of 3.6.4 and
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 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 (see 4.5.6) 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.
3.6.3 Antenna impedance. The impedance of the antenna when measured as specified in 4.5.2 and when
measured at the connection of the transmission line shall be such that the voltage standing wave ratio (VSWR)
produced on the input radio frequency cable is in accordance with the applicable specification sheet (see 3.1).
3.6.4 Sampling probe impedance. When antennas are tested as specified in 4.5.3, the impedance of the probe
shall be as specified in the applicable specification sheet (see 3.1).
3.6.5 Sampling probe attenuation. Unless otherwise specified (see 3.1), when tested as specified in 4.5.4, the
attenuation of the signal measured at the connector of the probe when a signal is fed to the antenna at its RF
connector shall measure between 16 dB and 19 dB (such as, 17.5 dB ± 1.5 dB) over the frequency range of 0.960 GHz to
1.220 GHz.
3.6.6 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 45 degrees to 95 degrees
shall not be more than 0.5 dB below the gain of a matched quarter-wave stub antenna in the same location
(see figure 1).
3.6.7 Voltage standing wave ratio (VSWR). When antennas are tested as specified in 4.9, the VSWR (as
referenced to a 50 ohm system) at the input of the radio frequency cable (the output is connected to the antenna
input) shall be no greater than specified in the applicable specification sheet (see 3.1).
3.7 Ungrounded stub antenna. Unless otherwise specified in the specification sheet (see 3.1), the radiating
element is not grounded to the base of the antenna.
3.8 Weight. The weight of the antenna shall be in accordance with the applicable specification sheet (see 3.1).
3.9 Marking. Antenna shall be marked in accordance with MIL-STD-130 and shall include the PIN (see 1.3),
contract, serial number, date code (year, month) and manufacturer's code.
Example: PIN M25708/1-01
Type
Serial No. 1234
77 10 12345
3.10 Longevity. Design and construction shall provide a mean longevity of a minimum of 6,000 hours of
operational service life.
3.11 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally
preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the
operational and maintenance requirements, and promotes economically advantageous life cycle costs.
3.12 Workmanship. Workmanship must be in accordance with accepted industry practice.
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