7/8” Radiation Leaky Cable

Description

The 7/8″ variant is the preferred size for “Main Line” radiating systems due to its ultra-low longitudinal attenuation. This allows a single base station to drive much longer cable runs (often several kilometers) compared to smaller 1/2″ variants. The cable uses a physically foamed Polyethylene (PE) dielectric and a slotted corrugated copper outer conductor to maintain a stable radiation pattern even in humid or dusty underground environments.

In tunnel applications, the 7/8″ leaky feeder eliminates the signal “shadows” caused by curves and obstacles that would block traditional point-source antennas. It is almost exclusively jacketed in Low Smoke Zero Halogen (LSZH) fire-retardant materials to comply with international safety standards for public transit and confined industrial spaces.

Key Technical Advantages

• Extended Reach: Lower signal loss allows for longer cable runs between active equipment, reducing the total cost of infrastructure.

• Broadband 5G Support: Optimized for wideband performance, supporting everything from VHF/UHF (150 MHz) up to the latest 5G Sub-6GHz (3.5 GHz) bands.

• Uniform Field Strength: Provides consistent signal levels across the entire length, preventing “dropped calls” or data lag in moving transit vehicles.

• High Power Handling: Capable of carrying high-power signals from multi-carrier base stations without overheating or signal degradation.

• Fire & Safety Rated: Available with specialized LSZH jackets that are non-corrosive and emit minimal smoke, essential for passenger safety in tunnels.

Key Features

• Impedance: 50 Ohm (±2 Ohm).

• Outer Diameter: ~27.5mm to 28.5mm.

• Outer Conductor: Slotted Corrugated Copper.

• Coupling Loss (95%, 2m): ~65 dB – 75 dB (depending on slot configuration).

• Fire Safety: LSZH / Flame Retardant (Standard).

• Applications: Metro Rail Tunnels, Road Tunnels, Underground Mines, and Large Stadium Plenums.

Technical Summary