Semi-Finished Coaxial Cable – RG7 CCS/64/CCA
1. Cable Structure (No Outer Jacket)
| Layer | Material | Approximate Diameter |
|---|---|---|
| Inner Conductor | Copper-Clad Steel (CCS), Ø ~1.13 mm | ~18 AWG |
| Dielectric Insulation | Gas-injected Foamed Polyethylene (FPE) | ~5.2–5.4 mm |
| First Shield (Foil) | Bonded Aluminum-Polyester Foil (100%) | — |
| Second Shield (Braid) | 64-wire Copper-Clad Aluminum (CCA), ~40% coverage | — |
| Outer Jacket | Not included (semi-finished) | — |
Outer Diameter (core only): ~6.0 mm
Finished Cable OD (with jacket): ~7.8–8.2 mm (depends on jacket material)
2. Electrical Performance
| Parameter | Typical Value |
|---|---|
| Characteristic Impedance | 75 ohms |
| Capacitance | ~54 pF/m |
| Velocity of Propagation | ~85% (due to FPE) |
| Attenuation @ 100 MHz | ~6.8–7.0 dB/100m |
| Shielding Effectiveness | Moderate |
| Mechanical Strength | High (due to CCS core) |
3. Key Features
CCS Inner Conductor: Provides excellent pulling strength and durability
64-Wire CCA Braid: Offers better shielding than aluminum braid, while more economical than copper
100% Foil Shielding: Helps suppress signal leakage and improve RF performance
Semi-Finished Format: Allows jacket customization (PVC, PE, LSZH, UV-resistant, etc.)
4. Application Scenarios
CATV and satellite signal transmission in mid-sized buildings or residential networks
Indoor/outdoor coaxial systems with moderate EMI exposure
OEM and private-label coaxial cable production
Projects requiring a balance of signal performance, shielding, and cost control
5. Considerations
Attenuation is higher than RG11 due to smaller conductor
CCA braid is less mechanically durable than pure copper
Jacket must be applied before field installation
6. Comparison Table – RG7 Semi-Finished Variants
| Variant | Conductor | Braid Shield | Shield Coverage | Attenuation @100 MHz | EMI Protection | Cost |
|---|---|---|---|---|---|---|
| CCS/64/CCA | CCS | CCA x 64 | ~40% | ~6.8–7.0 dB/100m | Moderate | 💲💲 |
| CCS/64/AL | CCS | AL x 64 | ~40% | ~6.9–7.2 dB/100m | Moderate | 💲💲 |
| CCS/48/CCA | CCS | CCA x 48 | ~30–35% | ~7.2–7.5 dB/100m | Basic | 💲 |
| CU/64/CCA | Copper | CCA x 64 | ~40–45% | ~6.4–6.6 dB/100m | Higher | 💲💲💲 |
