MIL-PRF-49204B(CR)
4.9 Test equipment. The 350 watt RF power source for balun testing may
be any unmodulated generator capable of adjustment to the required power
level, capable of adjustment to the designated test frequency, and having a
harmonic content of less than 10%.
4.10 Reference dipole antenna. The reference dipole antenna for gain
measurements shall be vertically polarized balanced dipole. Length of the
dipole shall be continuously adjustable. At each test frequency, length shall
be adjusted to half-wave length resonance, considering end effects (usually
95% to 97% of one half wave length). When so adjusted, free space VSWR shall
be less than 2.0 to 1. The coupling balun shall be a 1 to 1 impedance ratio.
Balun coupling loss shall be less than 1 dB. The transmission line shall be
the same line or an identical line to that of the antenna under test. Free
space VSWR of the antenna and coupling loss of the balun shall be measured
over the frequency range of the antenna under test. A typical antenna for
this purpose is shown in Figure 1.
4.11 Initial Visual Inspection. The equipment shall be visually
inspected for compliance with the requirements of this specification to
include: radiating elements, feedcone structure, corona notice, balun,
reparability, air pressure test vent, protective cap, insulating extension,
transmission line, Mast AB-1244 ( )/GRC, connector adapter, anti-corrosion
compound, construction, straps, compartmentation, instructions, height, ground
area, galvanic corrosion, casting, impregnation of aluminum castings,
uniformity, resistance to precipitation, marking, system safety engineering,
human engineering, workmanship.
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