MIL-DTL-915/48D
Seventh - Shield insulation of one polyester tape, in accordance with NEMA FI 4 plus a
jacket of clear polyamide in accordance with ASTM D 4066. Nominal
thickness of 0.003 inch. Standard identification code applied by method 2.
- Alternate shield insulation of two polyester tapes, in accordance with NEMA
FI 4, sealed. Standard identification code applied by method 2, on inner tape.
Eighth - The required number of pairs (see table I) cabled with a lay not greater than
24 times the pitch diameter of the layer. Cabling sequence shall be
consecutive, starting with pair no. l, from center outward. Nonfibrous fillers
shall be employed.
Ninth
- Synthetic rubber compound filled binder tape applied helically with overlap.
(Surface of tape shall be such that cable jacket will adhere to it.)
Tenth - Arctic type polychloroprene jacket (black). (See table I for thickness.) Cable
surface marking required.
TABLE I. Details.
Cable jacket
Overall diameter
thickness
Minimum
Maximum
minimum (inch)
Type and size
Number of pairs
(inches)
(inches)
2SWF-3
3
0.100
0.600
0.625
2SWF-4
4
0.090
0.600
0.625
2SWF-7
7
0.110
0.780
0.815
2SWF-24
24
0.125
1.190
1.250
EXAMINATION AND TESTS:
Requirements
Basic electrical:
Conductor resistance - ohms/1000 feet, at 25°C, maximum.........................................................17.71
Voltage withstand - volts root mean square, minimum
Conductor to conductor ...................................................................................................... 2000
Conductor to shield.............................................................................................................1000
Shield to shield......................................................................................................................500
Insulation resistance megohms-1000 feet, minimum
Conductor to conductor ...................................................................................................... 3000
Conductor to shield.............................................................................................................1500
Shield to shield......................................................................................................................100
Group A:
Visual and dimensional .......................................................................................................... No failure
Hydrostatic (open end) - leakage 1000 lbf/in2, in 6 hours, in3, (test each shipping
length) .................................................................................................................... Zero
Capacitance
Mutual capacitance - at l MHz, pF/ft, maximum............................................................30
Capacitance unbalance - percent, maximum..................................................................... 8
Characteristic impedance - at l MHz, ohms..................................................................................75 ± 5
2
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