MIL-DTL-22354C
6. NOTES
(This section contains information of a general or explanatory nature which may be helpful, but is not
mandatory.)
6.1 Intended use. The AT-948/U antenna is intended for use with drone command transmitting and receiving
equipment in the frequency range from 400 to 550 megahertz (MHz). The antenna is a general purpose antenna,
however, and can be used for other applications within the limits of its frequency range, power, and gain
characteristics. Primarily it is intended for installation in the uppermost point aboard a ship.
6.1.1 Alternate construction. This specification is not intended to be restricted 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 a clear description for the points of difference of approval and
provided that all performance requirements on this specification are met.
6.2 Acquisition requirements. Acquisition documents must specify the following:
a. Title, number, and date of this specification and specification sheet.
b. If required, the specific issue of individual documents referenced (see 2.2.1).
c. Packaging requirements (see 5.1).
d. Equipment shock grade.
e. Antenna mounting location.
f. Inclination requirements.
6.3 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.
Environmental Protection Agency (EPA) is focusing efforts on reducing 31 priority chemicals. The list of chemicals is
available on their website at https://www.epa.gov/epaoswer/hazwaste/minimize/. Included in the EPA 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).
6.4 Subject term (key word) listing.
circularity
dipole
mounting brackets
salt atmosphere
tilt
VSWR
wind load
6.5 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 3.1.3.7) For additional information on this matter, refer to
ASTM-B545 (Standard Specification for Electrodeposited Coatings of Tin).
6.6 Changes from previous issue. Marginal notations are not used in this revision to identify changes with respect
to the previous issue due to the extent of the changes.
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