Coaxial Cable RG7 CU/48/CCA Construction – Semi-Finished Core
1. Structure and Dimensions (No Jacket)
| Component | Description |
|---|---|
| Inner Conductor | Solid bare copper (CU), diameter approx. 1.13 – 1.20 mm |
| Dielectric Insulation | Gas-injected or solid foamed polyethylene (FPE), Ø ≈ 5.0 – 5.3 mm |
| Shielding 1 | Aluminum foil bonded to dielectric (100% coverage) |
| Shielding 2 | 48-wire braid, made from CCA (Copper-Clad Aluminum), ~70–75% coverage |
| Outer Jacket | Not included – this is a semi-finished, pre-sheathed coaxial core |
2. Electrical & Performance Characteristics
| Parameter | Typical Value |
|---|---|
| Impedance | 75 ± 3 ohms |
| Capacitance | ~53 – 55 pF/m |
| Velocity of Propagation | ≥ 85% |
| Attenuation @100 MHz | ≤ 8.5 dB/100m |
| Return Loss @100 MHz | ≥ 18 – 20 dB |
| Shielding Effectiveness | ≥ 35 – 40 dB |
| DC Resistance (Inner Conductor) | ≤ 21.0 ohms/km |
Performance may vary slightly depending on dielectric quality, braid pitch, and extrusion accuracy.
3. Key Features & Advantages
1. Pure Copper Core for Stable Signal Integrity
Solid copper ensures low resistance, strong signal retention, and reliable performance over long distances
2. 48-Wire CCA Braid Shield – Economical Shielding
~70–75% optical coverage with balanced EMI protection
Sufficient for most standard surveillance, CATV, and headend distribution systems
3. Flexible OEM Adaptability
Designed for final jacket extrusion using materials suitable for:
Indoor (PVC)
Fire-rated indoor (LSZH – CPR Dca/Cca)
Outdoor/direct burial (UV-resistant PE)
4. Lightweight and Cost-Effective
CCA braid offers lower material cost and reduced weight compared to full copper braid
4. Supply & Packaging Format
| Specification | Detail |
|---|---|
| Core Outer Diameter | ~7.3 – 7.7 mm |
| Standard Reel Length | 500m / 1,000m wooden drums |
| Packaging | PE-wrapped wooden reels or carton coils |
| Printing | None – bare core ready for jacket branding |
| MOQ | 3,000 – 5,000 meters |
5. Application Scenarios
Final production of RG7 coaxial cables for:
Analog HD CCTV systems
Satellite TV (LNB to receiver)
RF signal distribution for commercial/residential buildings
Suitable for installation in:
Apartments, hotels, offices, warehouses
Outdoor/underground systems (when jacketed with PE)
CPR-compliant buildings (when jacketed with LSZH)
6. Optional Customizations
Dielectric: Solid vs foamed PE (affects signal attenuation & weight)
Shield: Braid pitch, wire diameter, or switch to 64/96 wires for higher performance
Jacket: PVC, LSZH, PE, CPR-rated options (Dca/Cca/B2ca)
Messenger wire: For aerial use with steel support core
Color: Optional color coding or dual-layer extrusion (e.g., black + UV barrier)
7. Summary
| Feature | Value |
|---|---|
| Performance Level | Standard-grade shielding |
| EMI Protection | Moderate (~70–75% braid coverage) |
| Application Suitability | Cost-sensitive CCTV & RF distribution |
| Cost vs. CU/64/CCA | Lower, but less EMI protection |
Differences between RG7 CU/48/CCA, RG7 CU/64/CCA and CU/96/CCA
| Feature | RG7 CU/48/CCA | RG7 CU/64/CCA | RG7 CU/96/CCA |
|---|---|---|---|
| Inner Conductor | Solid pure copper (CU) | Solid pure copper (CU) | Solid pure copper (CU) |
| Shield Type | 48 wires, braided CCA | 64 wires, braided CCA | 96 wires, braided CCA |
| Braid Coverage (approx.) | ~70–75% | ~80–85% | 95–98% (nearly full coverage) |
| Shielding Effectiveness (EMI) | Basic | Good | Excellent |
| Mechanical Strength | Moderate | Stronger | Very strong |
| Flexibility | More flexible | Moderate | Slightly stiffer due to dense braid |
| Signal Leakage | Acceptable | Lower leakage | Minimal leakage |
| Attenuation | Higher (weaker shielding) | Lower | Lowest (best signal retention) |
| Weight | Lightest | Moderate | Heaviest |
| Cost | Lowest | Medium | Highest |
Use Case Recommendations
| Application Environment | Recommended Version |
|---|---|
| Short-distance CCTV or indoor wiring | CU/48/CCA |
| Medium-range satellite or CATV installations | CU/64/CCA |
| Long-distance trunk lines, high-interference zones (e.g. near power lines or industrial equipment) | CU/96/CCA |
| High-end broadcast, data centers, or mission-critical networks | CU/96/CCA (best shielding) |
Summary
CU/48/CCA = Economical, flexible, suitable for standard applications.
CU/64/CCA = Balanced performance and cost; suitable for most outdoor or mid-range coax needs.
CU/96/CCA = Premium-grade; used where maximum shielding and signal integrity are critical.
