MIL-DTL-49104C
4.5.11 Attenuation. The attenuation of the pair of conductors shall be measured on a 50-foot length
of cable and computed to db per mile. The wet readings shall be taken on cable that has been in water at
least 96 hours. Measurements shall be taken at frequencies of 300 hertz, 1 kilohertz, and 4 kilohertz. If
any individual reading does not meet the requirement of 3.5.4, several samples shall be measured and an
average taken. The attenuation shall be calculated from direct measurements of the parameters R, L, C,
and G and using the standard formula for the attenuation of a two-wire transmission line as follows:
2
2 2
2
2
2
2
S = 8.69
1/2 ( (R +W L ) (G +W C )
+RG-W LC) dB/mile
Where attenuation is in decibels per mile, and 8.69 is a factor to convert nepers to decibels.
R = Resistance in ohms per mile
L = Inductance in henries per mile
C = Capacitance in farads per mile
G = Conductance in mhos per mile
W = 2šf, where f = frequency in hertz
4.5.12 Crosstalk. The crosstalk of the finished cable shall be measured on two lengths of cable,
each being one mile long, and taped together at approximate one-foot intervals. The referenced
measurement shall be made on the near end. The two cables shall not be twisted together while taping.
Crosstalk shall then be measured with the cables strung aerially and laid on the ground. Both ends of the
taped cable may be brought back to the same point for ease in testing. The 600 Ω non-wirewound
resistors shall be connected between conductors at the terminal ends of each pair in the two pair
assembly, except on the cable end that shall be used for the disturbing signal. This signal shall be
applied using an oscillator set at 600 Ω internal output impedance. Readings at .3, 1, and 4 kilohertz shall
be taken of the amount of signal received in the other (disturbed) pair in db below the disturbing signal.
4.5.13 Flatness. One hundred feet of finished cable shall be pulled from a reel or spool or dispenser,
as applicable, and allowed to lie free on a flat floor. With no strain on the free end, a point along the cable
3 feet from the free end shall be not less than 96 feet from the original 100-foot mark on the cable.
4.5.14 Conductor separation. A specimen of the finished cable shall be subjected to a tensile force
necessary to separate the two conductors and the force shall be measured using the apparatus and
method described in method 3021 of FED-STD-228.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When actual packaging of materiel is to be performed by DoD personnel, or
in-house contractor personnel, these personnel need to contact the responsible packaging activity to
ascertain packaging requirements. Packaging requirements are maintained by the Inventory Control
Point packaging activities within the Military Service or Defense Agency, or within the military service's
system command. Packaging data retrieval is available from the managing Military Service or Defense
Agency's automated packaging files, CD-ROM products, or by contacting the responsible packaging
activity.
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