MIL-PRF-55359A(CR)
3.4 Finish, protective. The finish shall be suitable for the environment in which the
antenna will be used. Drawing DL-SM-A-498900 and MIL-F-14072 may be used as guides. The
use of Film B on type I surfaces for the final paint film is recommended.
3.5 Marking.
3.5.1 General. Mark directly or by label to include nomenclature, contract number, serial
number, date, manufacturing code, part number, and national stock number. Use clear and legible
lettering and a method of marking to withstand the operating environment. DL-SM-A-498900
and MIL-M-13231 may be used as guides.
3.5.2 Visibility. Whenever practicable, parts shall be to mounted that their identification
markings will be readily visible with minimum disassembly of the equipment.
3.5.3 Serial Numbers. The unit(s) on this order shall have serial numbers.
3.6 Tropicalization of materials. Materials shall be treated as follows:
3.6.1 Treating materials. Treating materials containing a mercury-bearing fungicide shall
not be used. The contractor shall determine that the treating material is compatible with the
material or surface to be treated. Selection of treating materials shall be such that any increase in
flammability of treated material will be held to the practical minimum.
3.6.2 Toxicity. Treating materials shall cause no skin irritation or other injury to
personnel handling the treated material during fabrication, transportation, operation, or
maintenance of the equipment, or during use of the finished items when used for the purpose
intended.
3.6.3 Flexibility. Treatment shall not affect the flexibility of treated materials, to the
extent that the equipment may fail to meet specified requirements when subjected to specified
service conditions.
3.7 Performance characteristics.
3.7.1 Output impedance (see 4.5.1). The unit(s) feed ports shall have a 50 ohm output
impedance from 108 to 122 MHz.
3.7.2 Voltage standing wave ratio (VSWR) (see 4.5.2). The impedance of the antenna at
the input connector of the cable assembly, shall be such that the VSWR referenced to a 50 ohm
system does not exceed 5.0 to 1 throughout the frequency range of the antenna. The
measurement shall be made with the antenna mounted on the ground plane of Figure 3.
3.7.3 Polarization (see 4.5.3). The antenna shall receive horizontally polarized signals.
Reception of vertically polarized signals shall be at least 12 dB down from the level of
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