Coaxial Cable Engineering: Overcoming Signal Loss in RF Distributions
An engineering review of copper-clad aluminum (CCA) vs. solid copper conductors in high-frequency RG-6 and RG-11 installations.
LANKABLE Laboratory Division
Published on Jul 29, 2026 · 7 min read read
Executive Overview
Radio Frequency (RF), MATV, and satellite distribution networks operate in high-frequency spectrums from 5 MHz up to 3000 MHz. At these frequencies, transmission lines are susceptible to rapid dielectric attenuation and structural return loss (SRL).
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1. Conductor Metallurgy: Solid Bare Copper vs. Copper-Clad Aluminum (CCA)
While skin effect allows high-frequency RF signals to propagate across the outer copper cladding of CCA wires, solid bare copper remains mandatory whenever DC power is delivered to active headend amplifiers or satellite Low-Noise Block downconverters (LNBs).
| Conductor Spec | DC Loop Resistance ($\Omega/1000\text{ft}$) | Power Delivery Capability | Tensile Pull Strength |
|---|---|---|---|
| :--- | :--- | :--- | :--- |
| Solid Bare Copper (18 AWG) | 6.4 \Omega | High (Optimal for Satellite LNB & Amplifiers) | High (No brittle cracking) |
| Copper-Clad Aluminum (18 AWG) | 10.2 \Omega | Poor (High voltage drop and heating) | Low (Prone to fatigue fractures) |
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2. Quad-Shielding Geometry
To prevent LTE/5G cellular signals from interfering with RF video distribution, LANKABLE RG-6 and RG-11 cables utilize Quad-Shielding:
- Bonded Aluminum Foil (100% optical coverage)
- 60% Aluminum Wire Braid
- Secondary Non-Bonded Aluminum Foil
- 40% Aluminum Wire Braid
- Total Shielding Efficacy: Exceeds $105\text{ dB}$ across all UHF and VHF broadcast channels.
Technical Discussion (2)
Dr. Manish Sharma
Lead Infrastructure Architect, Telecom India
Excellent breakdown of the skin effect in copper conductors. We often overlook dielectric loss margins when planning dense tray bundles. Thanks for the math!
Rachel Green
Data Center Operations Lead
Extremely relevant for our upcoming facility upgrade. The CPR B2ca fire safety standards comparison was especially useful. Will share this with the cabling crew.