co-axial Tv cables
EMMFLEX coaxial cable (or "coax") is the most common cable used
for transmitting video signals. The name "coaxial" refers to the
common axis of the two conductors. Construction : A coaxial
cable has a solid copper or copper - clad - steel centre
conductor surrounded by a nonconductive dielectric, insulating
material. The dielectric is surrounded by foil shield/s and/or
copper braid/s which form the outer conductor and also shield
against electromagnetic interference (EMI). The outer conductor
/ shield is encased in a PVC jacket. Most coaxial cables for
video applications have a nominal impedance of 75 ohms. Their
differing electrical and physical characteristics make it
important to select the correct type of cable to suit the
applications.
| Components | RG 59 | RG 6 | RG 11 | |||
|---|---|---|---|---|---|---|
| Inches | MM | Inches | MM | Inches | MM | |
| Nominal Center Cond. Diameter | 0.032 | 0.81 | 0.040 | 1.02 | 0.064 | 1.63 |
| Nominal Diameter Over Dielectric | 0.144 | 3.66 | 0.180 | 4.57 | 0.280 | 7.11 |
| Nominal Diameter Over First Shield (Tape) | 0.151 | 3.84 | 0.187 | 4.75 | 0.287 | 7.29 |
| Nominal Diameter Over Jacket | 0.240 | 6.10 | 0.272 | 6.91 | 0.395 | 10.03 |
| Nominal Jacket Wall Thickness | 0.032 | 6.81 | 0.030 | 6.76 | 0.042 | 1.07 |
| Nominal Diameter of Steel Messenger | 0.015 (Single) | 1.30 | 0.051 (Single) | 1.30 | 0.072 (Single) | 1.83 |
| 0.072 (Dual) | 1.83 | 0.072 (Dual) | 1.83 | 0.109 (Dual) | 2.77 | |
| Mechanical Characteristics | RG 59 | RG 6 | RG 11 |
|---|---|---|---|
| Minimum Breaking | 0.051 | 0.051 | 0.072 |
| Strength of Messenger | 0.072 | 0.072 | 0.109 |
| Electrical Characteristics | RG 59 | RG 6 | RG 11 |
|---|---|---|---|
| Nominal Impedance | 75 ohms | 75 ohms | 75 ohms |
| Nominal Velocity of Propagation | 85% | 85% | 85% |
| Shielding Effectiveness | >100dB | >100dB | >100dB |
| Frequency MHz. | RG 59 (maxmum dB/100m) | RG 6 (maxmum dB/100m) | RG 11 (maxmum dB/100m) |
|---|---|---|---|
| 211 | 12.47 | 10.00 | 6.23 |
| 250 | 13.45 | 10.82 | 6.72 |
| 270 | 14.08 | 11.12 | 6.99 |
| 300 | 14.84 | 11.72 | 7.37 |
| 325 | 15.45 | 12.20 | 7.67 |
| 350 | 15.75 | 12.63 | 7.94 |
| 400 | 16.73 | 13.61 | 8.53 |
| 450 | 17.72 | 14.43 | 9.02 |
| 500 | 18.70 | 15.09 | 9.51 |
| 550 | 19.52 | 16.08 | 9.97 |
| 600 | 20.34 | 16.73 | 10.43 |
| 750 | 22.87 | 18.54 | 11.97 |
| 875 | 24.67 | 20.01 | 13.05 |
| 1000 | 26.64 | 21.49 | 14.27 |
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