Optoelectronic Displays

Digital TV CATV Coaxial Cable With Messenger , Standard Shield RG Type Coaxial Cable

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1. Center conductor

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The center conductor shall be copper clad steel with a minimum tensile strength of 440 MPa and appropriate conductivity to meet the electrical characteristics indicated in Table No. 1 and Table No. 2.

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2. Dielectric

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Gas injected foamed polyethylene; it shall meet all applicable requirements of ASTM D 1248, shall be an insulating grade virgin polyethylene and shall not contain reground, reprocessed or recycled materials. It shall be applied concentrically and bonded to the center conductor.

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3. Shield Construction

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Laminated Shielding Tape (LST). The LST shall be constructed of two aluminum foils laminated to a strength member and a bonding resin on one side. The LST shall overlap the dielectric circumference by 10 percent minimum.

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4. Braid Wire

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The braiding wire shall be a round aluminum wire consisting of 34 AWG (0.0063 ± 0.0003 inches), (0.160 ± 0.01 mm) using an aluminum alloy of 5056, 5154, 5154A, or 5954.
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TABLE NO.1 ELECTRICAL CHARACTERISTICS

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Characteristics | unit | Specification |
Impedance | Ohms | 75±3 |
capacitance | pF/m | 52±3 |
MAX.DC loop resistance | Ohm/km | 126.1 |
MIN. velocity of propagation | % | 82 |
Structural return loss (SRL) | dB | ﹥20@5≧f≤1000MHz |
Dielectric strength inner conductor to outer conductor | V | 1000RMS for one minute |
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TABLE NO. 2 MAXIMUM? ATTENUATION @ 200C

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Frequency MHz | dB/100m |
5 | 2.66 |
55 | 5.25 |
211 | 10.10 |
250 | 11.25 |
270 | 11.48 |
300 | 12.14 |
330 | 12.76 |
350 | 13.15 |
400 | 14.11 |
450 | 15.03 |
500 | 15.93 |
550 | 16.70 |
600 | 17.77 |
750 | 19.69 |
870 | 21.33 |
1000 | 22.93 |
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TABLE NO. 3 PHYSICAL & MECHANICAL CHARACTERISTICS

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characteristic | unit | specification |
Center conductor diameter | mm | 1.02 |
Diameter over dielectric | mm | 4.5 |
Core ovality maximum | mm | 0.33 |
Thickness of shielding inner tape | mm | 0.067 |
Diameter over braid | mm | 5.22 |
Braid coverage | % | 59 min. |
Center conductor bond to dielectric | kg | 2.3mn |
messenger | mm | 1.3 |
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TABLE NO.4 PACKING CHARACTERISTICS

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characteristic | unit | specification |
packing | ? | Ply-wood reel |
Packing length | m | 5220 |
Max. Reel flange, D1 | cm | 72 |
Max. reel width, L1 | cm | 45 |
Traverse, L2 | cm | 41 |
Arbor hole, D4 | cm | 5.1 |
Drive hole, D3 | cm | 2.8 |
Drive radius, E | cm | 9 |
Drum diameter, D2 | cm | 25 |
Inside drum to drive hole distance, F | cm | 0.5 |
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