MIL-DTL-3643 Connectors, Coaxial, Radio Frequency, Series Hn, And Associated Fittings, General Specification ForThis specification covers the general requirements for weatherproof, series HN-radio-frequency, coaxial connectors and associated fittings. These connectors have a nominal impedance of 50 ohms, an operating voltage of 1,500 volts root mean square, and a nominal operating frequency range of 0 to 10,000 MHz \(see 6.1 and 6.3\).

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MIL-DTL-3643B

3.2.7 Soft solder. Soft solder shall be in accordance with composition Sn60 of J-STD-006.

3.2.8 Polytetrafluoroethylene. Polytetrafluoroethylene shall be in accordance with ASTM D1710.

3.3 Design and construction. Connectors and associated fittings shall be of the design construction,

and physical dimensions specified (see 3.1). Parts having similar electrical characteristics may be

combined (fabricated as a single piece) to simplify construction. Parts of unlike materials may be

combined such as brass and copper beryllium, provided copper beryllium is used in the fabrication of the

single-piece construction.

3.3.1 Metal parts. Unless otherwise specified (see 3.1), all metal parts shall have a silver plating not

less than .0002 inch (0.005 mm) thick of sufficient smoothness and density to withstand the salt-spray

(corrosion) test specified in 4.4.3. Silver plating shall be in accordance with ASTM B700. Dimensions of

metal parts shall include the plating (see 3.1).

3.3.2 Screw threads. Screw threads shall be in accordance with FED-STD-H28, and shall have the

specified fit after plating (see 3.1).

3.3.3 Gage tests for contacts.

3.3.3.1 Center contacts (female). The center contacts shall meet the gage tests specified in 4.4.1.1 as

piece parts and 4.4.1.2 in the assembled connector.

3.3.3.2 Outer contacts. The outer contacts shall meet the gage tests specified in 4.4.1.1.2 as piece

parts and 4.4.1.2.2 in the assembled connector.

3.3.3.3 Outer contact form over. When outer contacts are tested as specified in 4.4.1.3, they shall

show no signs of loosening.

3.3.4 Assembly and rotation. When tested as specified in 4.4.1.4, the assembled coupling nuts for

electrical plug connectors and connector adapters shall not disengage. Subsequent to this test, the

coupling nuts shall be free finger turning.

3.3.5 Interchangeability (applicable only to male terminations). The male terminations of the

connectors shall mate properly with the test gage specified in 4.4.1.5. Protrusion of the spring-loaded pin

beyond the spring retainer shall indicate an interference fit or eccentricity.

3.4 Dielectric withstanding voltage. When connectors are tested as specified in 4.4.2, there shall be no

evidence of breakdown.

3.5 Salt spray (corrosion). When connectors and associated fittings are tested as specified in 4.4.3,

they shall show no evidence of destructive corrosion or pitting. Destructive corrosion shall be construed

as any type of corrosion, which in any way interferes with mechanical or electrical performance.

3.6 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or

environmentally preferable materials should be used to the maximum extent possible, provided that the

material meets or exceeds the operational and maintenance requirements, and promotes economically

advantageous life cycle costs.

3.7 Marking. Connectors and associated fittings shall be marked in accordance with MIL-STD-130,

with the type designation and the manufacturer's code symbol. Marking shall be in depressed characters

approximately .093 inch (2.36 mm) high, in the place specified (see 3.1).