MIL-DTL-25708F
4.9.3 Reflectometer method. When using the reflectometer method for measuring VSWR, a complete curve shall
be recorded by an X-Y recorder. Calibration curves that represent the maximum VSWR to be measured and the
limits of the bands of doubt (see 6.3.2) shall be plotted on the graph paper. Curves shall be plotted with a limit of 1
octave per plot. VSWR calibration curves shall be plotted on the graph paper. Curves shall be plotted with a limit of 1
octave per plot. VSWR calibration curves shall be plotted in increment of 0.1 between VSWR limits of 1.1:1 and
1.9:1, and 0.2 above a VSWR of 1.2:1 and grid markers along the horizontal axis to represent 100 MHz frequency
increments. Prior to accomplishing VSWR measurements, the maximum VSWR calibration curve shall be re-checked
to insure repeatability of the curve. If values of VSWR are within the band of doubt, the VSWR shall be measured
using the slotted line method (see 4.9.1) in sufficiently close increments to define a smooth curve structure, but at
increments not greater than specified in 4.9.1, or the VSWR shall be measured by the reflectometer method using the
expanded reflectometer scale to define an expanded curve covering the entire paper.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When packaging of material is to be performed by DoD or in-house contractor personnel, these personnel
need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activities within the Military Service or Defense Agency, or
within the military service's system commands. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. The antenna is a radiation element having an essentially omnidirectional, vertically polarized,
radiation pattern intended for use with airborne identification beacon and TACAN sets. The antenna is military unique
since it must survive and meet performance requirements while mounted on military aircraft, throughout mission,
lifecycle, worldwide environments.
6.2 Ordering data. Acquisition documents must specify the following:
a. Title, number, date of this specification with the applicable specification sheet and the complete PIN (see
b
First article samples and tests.
(1) Number of first article samples and combination of antennas, if applicable.
(2) Point of inspection.
(3) Requirement for concurrent delivery of each sample and its test data. The acquiring activity should be
given at least 10 days prior notice when the first article tests are to be conducted so that they may be
supervised or witnessed, if desired, by a Government representative.
(4) Requirement for periodic group B testing (see 4.4.2 and 4.4.2.1).
6.3 Definitions.
6.3.1 Antenna. An antenna for the purpose of this document is an assembly of components including input
terminal mounting provisions and radomes required to radiate or receive electromagnetic energy.
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