MIL-DTL-23806B
4.5.8 VSWR (see 3.4.9). The VSWR of a minimum length of 100 feet of cable shall be measured over
the specified frequency range (see 3.1) using a swept frequency technique with capability of measuring a
VSWR of 1.04 or less. The measurement system may be in the form of directional coupler(s), hybrid,
reflection coefficient bridge, or any other method acceptable to the Government, and shall have a
directivity of at least 35 dB.
4.5.9 Bending (see 3.5.1). Unless otherwise specified (see 6.2) the bending test shall be conducted on
unjacketed samples.
4.5.9.1 Specimen. The length of cable shall be sufficient to provide three complete coils around the
mandrel specified (see 3.1) and shall be taken from the test sample used for the initial VSWR test.
4.5.9.2 Procedure. One end of the test specimen shall be clamped circumferentially at any two point,
approximately 45° apart, to a mandrel having a diameter specified (see 3.1). The specimen shall then be
coiled and uncoiled (the mandrel shall be rotated a minimum of 720°). After the cable has been initially
coiled on the mandrel it shall then be uncoiled or coiled in the reverse direction to a total of five coils.
Although no special tools shall be used during the bending of the cable, a mechanism may be provided to
guide the cable on the mandrel. The cable shall be coiled and uncoiled at a rate between 1 and 5
revolutions per minute.
The VSWR (see 3.4.9) and dielectric strength (see 3.4.3) shall be measured on the coiled sample after
the fifth cycle. The VSWR may be measured on the sample while coiled.
4.5.10 Temperature cycling. The specimen shall be taken from the test sample used for the initial
VSWR test. A length of cable with connectors properly attached, sufficient to make one complete 360°
turn shall be coiled on a mandrel of the diameter as specified (see 3.1). The mandrel with cable firmly
attached shall be placed in a chamber(s) and subjected to the temperature cycling specified in table VI.
After the cycling has been completed, the cable shall meet the requirements of 3.4.3, 3.4.9, and the Note
cited in 4.5.1.
TABLE VI. Temperature cycling.
Step
Temperature (°C)
Time (Hours)
-55° + 2°
1
4 to 8
2
4 to 24
25° +10°, -5°
85° + 2°
3
4 to 8
25° +10°, -5°
4
4 to 24
11
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