MIL-DTL-28791C
6.3 Definitions. For the purpose of the specification, the following definitions apply.
6.3.1 Isolator. A ferrite device that allows RF energy to pass in one direction with little attenuation while radio
frequency energy is flowing in the opposite direction is attenuated. A circulator with one port terminated in a matched
impedance will function as an isolator.
6.3.2 Circulator. A ferrite device having three or more ports with the characteristic that energy entering port 1
couples to port 2, energy entering port 2 couples to port 3 and energy entering the highest numbered port couples to
port 1.
6.4 Subject term (keyword) listing.
Aluminum
Insertion loss
Coaxial
Radar
Copper
Stripline
Dielectric withstanding voltage
VSWR
Ferrite
Waveguide
6.5 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
and additional information is available on their website https://www.epa.gov/osw/hazard/wastemin/priority.htm. Use of
these materials should be minimized or eliminated unless needed to meet the requirements specified herein (see
Section 3).
6.6 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 3.3.4). For additional information on this matter, refer to ASTM-B545
(Standard Specification for Electrodeposited Coatings of Tin).
6.7 Changes from the previous issue. The margins of this specification are marked with vertical lines to indicate
where changes from the previous issue 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.
Custodians:
Preparing activity:
Army - CR
DLA - CC
Navy - EC
Air Force - 85
(Project 5985-2011-013)
DLA - CC
Review activities:
Navy - AS, MC, OS, SH
Air Force - 99
NOTE: The activities listed above were interested in this document as of the date of this document. Since
organizations and responsibilities can change, you should verify the currency of the information above using the
ASSIST Online database at https://assist.daps.dla.mil.
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