MIL-PRF-49204B(CR)
3.5 Basic Antenna. The basic antenna shall be a radio biconical design
having three equally spaced elements angles upward and three equally spaced
elements angled downward from a feedcone structure. A field mast assembled
from mating sections shall elevate the antenna and the antenna feed
arrangement. The system shall be capable of continuous duty.
3.6 Electrical Requirements. The following electrical requirements
apply to the completely assembled Antenna System, including the transmission
line, unless otherwise stated.
3.6.1 Bandwidth. The assembled antenna system shall comply with all
the following electrical characteristics, at all frequencies within the
specified range of frequency coverage, without electrical tuning, switching,
or physical adjustment.
3.6.2 Frequency Range. The frequency range of the antenna system shall
be at least from 30 to 88 Mhz.
3.6.3 Impedance. The reference load impedance for all measurements, at
the end of the transmission line opposite the antenna, shall be 50 ohms,
unbalanced to ground.
3.6.4 Free Space VSWR. Free space voltage standing wave radio for the
complete antenna system, including the transmission line, shall not exceed 3.0
to 1 in the frequency range of 30 to 88 Mhz (see 4.15.1)
3.6.5 Antenna Gain. Antenna Gain over the required frequency range
shall be no less than 3 dB below the gain of the reference dipole antenna.
(see 4.14.4).
3.6.6 Radiation Pattern. In accordance with the Electronic Industries
Association Standard RS-329 over the frequency range of 30 to 84 MHz. Over
the frequency range of 84 to 88 Mhz, the relative gain in any azimuth
direction shall not vary from the mean value by more +3 dB for 360 degrees of
rotation. (see 4.11.4)
3.6.7 RF Power Level. Continuous duty RF power capability of the
complete antenna system shall be 350 watts (see 4.15.3)
3.6.8 Dielectric Withstanding Voltage. Insulation material in the
feedcone structure and the insulating extension shall show no visible effects
or evidence of dielectric breakdown due to an applied voltage of 10,000 volts
after the system has been subjected to environmental stresses of the service
conditions specified herein. (see 4.15.5).
3.6.9
Balun.
3.6.9.1 Power Rating. The balun shall be capable of continuous duty
operation with a continuous wave input power of 350 watts, over the frequency
range specified herein. (see 4.15.4).
3.6.9.2 Coupling Loss.
Coupling loss through the balun shall not
exceed 0.5 dB. (see 4.15.4).
3.6.9.3 Balun VSWR. VSWR at the input of the balun connector shall not
exceed 2.0 : 1 in the frequency range 30 to 88 Mhz to be consistent with the
free space VSWR requirements of paragraph 3.6.4 for the complete system, when
tested in accordance with paragraph 4.14.3. (see 4.15.4).
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