MIL-DTL-18793B
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of the specification.
b.
Packaging requirements (see 5.1).
6.3 Details of construction. This specification is not intended to be restrictive with respect to the details of
construction, except where such details are specified. Alternate forms of construction will be considered, provided
that the contractor submits to the acquiring activity for approval a clear description of the points of difference and
further provided that all performance requirements of this specification are met.
6.4 Subject term (key word) listing.
dielectric
fiberglass
radiation test
radio frequency
RF connectors
RF transmission line
tropicalization
VSWR
6.5 Definitions.
Contractor tests: Contractor tests are those tests conducted by the contractor on an antenna to determine
6.5.1
that the antenna complies to the best of their knowledge and belief with all applicable requirements.
6.5.2
Preproduction tests: Preproduction tests are conducted at laboratory designated by the acquiring activity,
after the award of the contract, on samples which are representative of the production antennas to
determine that the antenna meets all the requirements of this specification.
6.5.3
Inspection tests: Inspection tests are those tests performed on the antenna submitted for acceptance
under the contract.
6.6 Inspection approval. Approval of products covered by this specification should be obtained from the acquiring
activity.
6.7 Environmentally preferable material. Environmentally preferable materials should be used to the maximum
extent possible to meet the requirements of this specification. As of the dating of this document, the U.S.
Environmentally Protection Agency (EPA) is focusing efforts on reducing 31 priority chemicals. The list of chemicals
and additional information is available on their website at https://www.epa.gov/osw/hazard/wastemin/priority.htm.
Included in the list of 31 priority chemicals are cadmium, lead, and mercury. Use of the materials on the list should
be minimized or eliminated unless needed to meet the requirements specified herein (see section 3).
6.8 Tin whisker growth. The use of alloys with tin content greater than 97 percent, by mass, may exhibit tin
whisker growth problems after manufacture. Tin whiskers may occur anytime from a day to years after manufacture
and can develop under typical operating conditions, on products that use such materials. Conformal coatings applied
over top of a whisker-prone surface will not prevent the formation of tin whiskers. Alloys of 3 percent lead, by mass,
have shown to inhibit the growth of tin whiskers (see 3.2.12). For additional information on this matter, refer to
ASTM-B545 (Standard Specification for Electrodeposited Coatings of Tin.)
6.9 Changes from previous issue. The margins of this specification are marked with vertical lines to indicate where
changes from the previous were made. This was done as a convenience only and the Government assumes no
liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the
requirements of this document based on the entire content irrespective of the marginal notations and relationship to
the last previous issue.
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