MIL-DTL-22354C
3.1.3.1 Dissimilar metals. Unless suitably protected against electrolytic corrosion, dissimilar metals (see MIL-
STD-889) shall not be used in intimate contact with each other. Dissimilar metals are defined as metal specimens
that are in contact or otherwise electrically connected to each other in a conductive solution and that generate an
electrical current.
3.1.3.2 Pressurization. The antenna shall be normally operated non-pressurized. Design shall be such that when
mounted vertically on a supporting structure, water, or other liquids cannot collect to an extent that could ultimately
result in failure or deterioration of performance of the antenna.
3.1.3.3 Maintenance and repair. The antenna shall be so constructed that maintenance and repairs can be made
with a minimum of disturbance to other components. Antennas shall be readily demountable and interchangeable to
provide ease of servicing, maintenance, and replacement.
3.1.3.4 Mounting brackets. The antenna shall have, at its base, a mounting flange with bolt holes to anchor the
antenna firmly in position when it is installed aboard ship.
3.1.3.5 Standardization. Every effort shall be made to standardize the units and parts entering into the
construction, in conformance with MIL-PRF-27, however, it is not intended to compromise the design or performance
of the antenna produced as a result of this specification.
3.1.3.6 Tropicalization. Tropicalization will not be required.
3.1.3.7 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally.
Tin content of antenna components and of solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a
minimum 3 percent lead, by mass (see 6.5).
3.2 Performance requirements.
3.2.1 Performance. The antenna shall be so manufactured that when mounted, in an unobstructed area, and
sufficiently elevated above ground (or equivalent), the pattern of the antenna shall be such as to provide essential
spatial coverage throughout a hemispherical volume.
3.2.2 Frequency. Antenna and feed system shall operate over the frequency range of 400 to 550 megahertz
(MHz).
3.2.3 Polarization. The antenna shall transmit rf energy, vertically polarized in the horizontal field.
3.2.4 Gain. The gain of the antenna in the horizontal field shall be approximately five (5) decibels (db) above an
isotropic (spherical radiation) source, or approximately three (3) db above a half-wave dipole source.
3.2.4.1 Vertical gain. The gain of the antenna in the vertical (overhead) direction shall be approximately nine
(9) db below an isotropic or approximately eleven (11) db below a half-wave dipole source. This is approximately
fourteen (14) db below the maximum horizontal gain.
3.2.5 Power rating (RF). The antenna shall be capable of handling 2,000 watts of rf power over the frequency
range of 400 to 550 megahertz (MHz).
3.2.6 Voltage Standing Wave Ratio (VSWR). The impedance at the input to the antenna shall match the 50-ohm
impedance of the input coaxial cable so that the VSWR does not exceed 1.8:1.0 over the entire 400 to 550
megahertz range.
3.2.7 Circularity. The antenna shall have a horizontal pattern that is omni-directional to within ±1.0 dB over the
400 to 550 megahertz frequency band.
3.2.8 Tilt. The antenna shall be designed to tilt the vertical lobe upwards to place the lower half-power point on or
below the horizon.
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