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

3. REQUIREMENTS

3.1 Specification sheets. The individual item requirements shall be as specified herein and shall be in accordance

with the applicable specification sheets (see 2.2.1). In the event of any conflict between the requirements of this

specification and the specification sheet, the latter shall govern.

3.1.1 First article. Adapters furnished under this specification shall be products that have been tested and have

passed the first article inspection specified in 4.4.

3.1.2 Design and construction. Adapters shall be of the design, construction, and overall physical dimensions

specified, and shall be capable of adapting the specified waveguide to the specified coaxial line (see 3.1).

3.2 Material. The material shall be as specified in the specification sheet (see 3.1). When a definite material is not

specified, a material shall be used which will enable the adapters to meet the performance requirements of this

specification. Acceptance or approval of any constituent material shall not be construed as a guaranty of the

acceptance of the finished product.

3.2.1 Metal parts. All metal parts shall be free from chips, burrs, and scratches in accordance with good commercial

practice (see 3.2.11). Electrical conducting brass parts shall be silver-plated not less than .0003-inch thick and then

rhodium flashed. The internal surfaces of all aluminum adapters shall be chemically treated in accordance with MIL-

DTL-5541.

3.2.1.1 Dissimilar metals. Unless suitably protected against electrolytic corrosion, dissimilar metals shall not be

used in contact with each other (see 6.5.1).

3.2.2 Plastic Parts. All plastic parts shall be free from visible cracks or flaws.

3.2.2.1 Plastic caps. The waveguide flange and RF connector ends of the adapter are to be sealed with push-on

plastic caps to prevent damage and to prevent the entrance of moisture and foreign material during storage.

3.2.3 Threaded parts. All threaded parts shall be in accordance with FED-STD-H28.

3.2.4 Connectors. Connector for a specified adapter shall be as specified (see 3.1). Materials, design, and

construction of the connectors shall conform to MIL-PRF-39012.

3.2.5 Waveguide flange. The waveguide flange used with each adapter shall properly mate with the flange

specified (see 3.1), which shall conform to MIL-DTL-3922.

3.2.5.1 Mating. No constructional detail of the adapters shall interfere with mating of the waveguide flange with its

counterpart.

3.2.6 Waveguide. The waveguide used with each adapter shall be of the type specified (see 3.1), and shall

3.2.6.1 Positioning of the coaxial extension. The coaxial extension of each adapter shall be positioned on the

waveguide so that all the electrical requirements are satisfied; however, since there are multiples of the satisfactory

electrical lengths from the end plate which will also satisfy the requirements, the distance from the end plate to the

coaxial extension shall be chosen as the shortest length possible.

3.2.7 Angular alignment. In assembling flanges to a section of waveguide, 1 inch by .5 inch and larger sizes, the

flange face shall make an angle of 90 degrees � 30 minutes with the E- and H-plane of the internal surfaces of the

waveguide; for smaller sizes, the flange face shall make an angle of 90 degrees � 15 minutes.

3.2.8 Brazed or welded joints. When a sleeve flange is attached to a waveguide by a weld or braze, the flange

face shall be machined smooth and shall show no sign of pits, air pockets, or other surface irregularities.

3.2.9 Soldered joints. All joints shall be silver soldered except that the end plate may be soft soldered. The silver

solder shall conform to QQ-B-654. The soft solder shall conform to composition SN-60 of IPC J-STD-004, IPC J-

STD-005, and IPC J-STD-006. All soldered joints shall be thoroughly cleaned to avoid corrosion.