8-inch coaxial lines to waveguides, series TNC connectors to waveguides, and series SMA connectors to waveguides, for general application by the armed services \(see 1.2, 1.3, 6.1, and 6.5\).

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MIL-DTL-22641F

6. NOTES

(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)

6.1 Intended use. Adapters covered by this specification are intended for use in the microwave region of the

electromagnetic frequency spectrum.

6.2 Acquisition requirements. Acquisition documents must specify the following:

(a) Title, number, and date of this specification.

(b) Title, number, and date of the applicable specification sheet, and the complete part number (see 3.1

and 1.3).

(d) First Article Testing Requirements (see 3.1.1, 4.4 and 6.4).

(e) Packaging requirements (see 5.1).

6.3 Subject term (key word) listing.

Connectors

Dissimilar metals

Flange

Insertion loss

Mating

Microwave

Radio frequency (RF)

Series N

Series SMA

Series TNC

Soldering

VSWR

6.4 First article inspection and approval. Information pertaining to first article inspection and approval of products

covered by this specification should be obtained from the acquiring activity.

6.5 Definitions. For the purpose of this specification, the following definition applies:

6.5.1 Dissimilar metals. Dissimilar metals are defined in MIL-STD-889.

6.5 Engineering information. Illustrations and additional engineering information for currently available adapters

are included in MIL-HDBK-216, RF Transmission Lines and Fittings.

6.6 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).

6.7 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 3.2.11). For additional information on this matter, refer to

ASTM-B545 (Standard Specification for Electrodeposited Coatings of Tin).