MIL-DTL-22931 Cables, Radio Frequency, Semirigid, Coaxial, Semi-Air-Dielectric, General Specification ForThis specification covers semi-air-dielectric, coaxial, semirigid radio frequency cables with smooth, corrugated, or braided outer conductors with outside diameters ranging from .500 to 3.125 inches, with an impedance of 50 or 75 ohms \(see 3.1\). The operating temperature ranges are -55 Degrees C to +80 Degrees C or -55 Degrees C to +200 Degrees C, as specified \(see 3.1\), and the storage temperature capability is -65 Degrees C.

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MIL-DTL-22931D

3.4.6 Velocity. When cables are tested as specified in 4.5.7, the velocity shall be as specified (see

3.1).

3.4.7 Capacitance. When cables are tested as specified in 4.5.8, the capacitance shall be as specified

(see 3.1).

3.4.8 Impedance. When cables are tested as specified in 4.5.9, the impedance shall be as specified

(see 3.1).

3.4.9 Voltage standing wave ratio (VSWR). When cables are tested in accordance with 4.5.10, the

VSWR of the sample unit shall not exceed the value specified (see 3.1) as the initial VSWR. The

connectors shall be included as part of the cable, and shall comply with the requirements specified

herein.

3.5 Environmental.

3.5.1 Pressure tightness (when applicable, see 3.1). When tested as specified in 4.5.11, cables with

smooth or corrugated outer conductors shall be capable of retaining the internal pressure specified (see

3.1), with a pressure drop of not more than 1 pound per square inch gage (psig) over a period of 24

hours.

3.5.2 Cold bend (when applicable, see 3.1). When specified, jacketed cable shall be tested as

specified in 4.5.12, and there shall be no evidence of cracking or splitting of the cable jacket.

3.5.3 Bending (when applicable, see 3.1). When specified, finished cables shall be tested in

accordance with 4.5.13. Following the test, the cable shall meet the requirements of 3.4.9 and 3.5.2.

When the alternate procedure is used, there shall be no evidence of kinking, wrinkling or cracking.

3.5.4 Temperature cycling (when applicable, see 3.1). When specified, cables shall be tested as

specified in 4.5.14. There shall be no evidence of mechanical damage, and the capacitance and VSWR

shall be as specified (see 3.1).

3.5.5 Thermal shock (when applicable, see 3.1). When specified, cables shall be tested as specified in

4.5.15. There shall be no flaring of any layer, and unless otherwise specified (see 3.1), the

measurements following exposure shall not vary from the original measurement by more than the

following:

Core

- .125 inch (3.18 mm)

Insulating layer

- .375 inch (9.53 mm)

Outer conductor

- .125 inch (3.18 mm)

Outer jacket

- .750 inch (19.05 mm)

3.5.6 Vibration, high frequency (when applicable, see 3.1). When specified, cables shall be tested as

specified in 4.5.16. There shall be no conductor discontinuity nor evidence of damage.

3.5.7 Shock (when applicable, see 3.1). When specified, cables shall be tested as specified in 4.5.17.

There shall be no conductor discontinuity nor evidence of damage.

3.6 Marking. The cables shall be marked in accordance with MIL-STD-130 with the complete PIN, the

manufacturer's code symbol, and the manufacturer's name, at least every 2 feet. The manufacturer's

code symbol shall be in accordance with MIL-STD-1285. Marking shall not permanently indent, deform,

or otherwise damage the jacket or outer conductor.