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Cáp đồng trục QR 540 - QR540 CATV cable
RF Aluminum Tube Trunk Cable for CATV Network, CommScope Distribution Cable, QR540 JCASP
Inner conductor is high quality copper clad aluminum (CCA), dielectric core is produced by insulating grade virgin polyethylene; RF welded aluminum sheet as shield, and medium density PE is used for jacket material. Asphaltic flooding compound is used to prevent damage from moisture.
| Physical dimensions | ||
| component | inches | mm |
| Inner conductor | 0.124 | 3.15 |
| diameter over dielectric | 0.514 | 13.03 |
| diameter over aluminum shield | 0.540 | 13.72 |
| Outer conductor thickness | 0.0135 | 0.343 |
| Diameter over jacket | 0.610 | 15.49 |
| Jacket wall thickness | 0.029 | 0.74 |
Mechanical performance:
Minimum bending radius: 4.0 inches/10.2cm
Maximum pulling tension: 220lbs /100kgf
Electrical characteristics:
Capacitance: 15.3±1.0pt/ft.(50±3.0nf/km)
Impedance: 75±2 ohms
Velocity of propagation: 88% nominal
Normal DC loop resistance @68OF: 1.61 Ohms/100ft(5.28 ohms/km)
Attenuation@ 68OF(20oC):
| @Frequency MHZ | dB/100ft. (MAX.) | dB/100 meters(MAX.) |
| 5MHZ | 0.14 | 0.46 |
| 55MHZ | 0.47 | 1.54 |
| 83MHZ | 0.58 | 1.90 |
| 211MHZ | 0.95 | 3.12 |
| 250MHZ | 1.03 | 3.38 |
| 300MHZ | 1.13 | 3.71 |
| 350MHZ | 1.23 | 4.03 |
| 400MHZ | 1.32 | 4.33 |
| 450MHZ | 1.40 | 4.59 |
| 500MHZ | 1.49 | 4.89 |
| 550MHZ | 1.56 | 5.12 |
| 600MHZ | 1.64 | 5.38 |
| 750MHZ | 1.85 | 6.07 |
| 865MHZ | 2.00 | 6.56 |
| 1000MHZ | 2.17 | 7.12 |
