MIL-DTL-49295C
3.2.6 Transport size. For first article samples, the outside dimensions of the closed bag, with all required items
properly stowed, shall not exceed the following:
Length
Perimeter
Antenna bag
24 inches
28 inches
OE-303/GRC bag
42 inches
36 inches
For all other inspection samples, the dimensions shall not exceed the dimensions above or + 1 inch of the average
length and + 2 inches of the average perimeter of the first article samples, whichever is smaller (see table III).
3.2.7 Parts, materials, and processes. Parts, materials, and processes shall be in accordance with best
manufacturing practices.
3.3 Structural Integrity. The structural integrity of the matching transformer structure (Drawing A3010435) shall be
such that it is capable of withstanding, without damage or indication of separation, an axial tensile force of 250
pounds applied (separately) at the following connectors: the matching transformer coaxial connector, the antenna
wire assembly connector, and the ground connector (see table III).
3.4 Electrical. The antenna system shall meet the following electrical requirements. Where a test is referenced,
meeting the test shall be considered as compliance with the requirement.
3.4.1 Matching transformer. The following electrical requirements apply to the Matching Transformer Assembly
(Drawing A3010410).
3.4.1.1 Coupling loss. Coupling loss through the matching transformer shall not exceed 0.5 dB (see 4.5.6. and
table II).
3.4.1.2 Matching transformer VSWR. Voltage standing wave ratio of each matching transformer shall be
consistent with the free space VSWR requirements of 3.4.2.4 for the complete system. For group A tests, the test
limit shall be the worst measurement of matching transformer VSWR of first article samples where that matching
transformer was part of an antenna system that complied with the free space VSWR requirement. A matching
transformer for which a degraded VSWR is measured, is acceptable provided that the requirement for free space is
complied with when it is tested at the input of the antenna system (50 foot transmission line not used) (see 4.5.5,
table II).
3.4.1.3 Matching transformer leakage (construction tightness). Each matching transformer shall show no evidence
of air leakage through sealed seams, joints, gaskets, or fastening screws when tested and corrected in accordance
with standard industry practice.
3.4.2 Electrical characteristics. Unless otherwise stated, the following electrical requirements apply to the
complete assembly antenna system, including the transmission line.
3.4.2.1 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.
3.4.2.2 Frequency range. Frequency range of the antenna system shall be at least from 30 to 88 MHz. It is not
required that performance decline above and below this range.
3.4.2.3 Impedance. The reference load impedance for all measurements, at the end of the transmission line
3.4.2.4 Free space VSWR. Free space voltage standing wave ratio for the antenna system, measured at the 50
ohm connection of the input matching transformer (50 foot transmission line not used), shall not exceed 1.5 to 1 in the
frequency range of 30 to 60 MHz and shall not exceed 2.0 to 1 in the frequency range of 60 to 88 MHz (see 4.5.1.1).
3.4.2.5 Antenna gain. The average antenna gain over the required frequency range shall be at least 6 dB above
the gain of the vertical dipole antenna, but not less than 3.5 dB at any particular frequency (see 4.5.1.5, table III).
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