FXL-780 is a high-performance, 50-ohm corrugated coaxial cable designed specifically for high-power broadcast, cellular base stations, and demanding RF infrastructure. Part of the HELIAX family (originally by Andrew/CommScope), it is known for its smooth-wall aluminum outer conductor, which provides exceptional flexibility and signal integrity compared to standard braided cables.
Key Features
Low Attenuation: The smooth-wall aluminum design minimizes signal loss, making it ideal for high-frequency transmissions over long vertical or horizontal runs.
Exceptional Shielding: The solid corrugated outer conductor provides 100% RF shielding, eliminating signal leakage and protecting against external interference.
High Power Handling: Engineered to manage high average and peak power levels, often used in FM/TV broadcasting and high-capacity cellular sites.
Phase Stability: Offers excellent phase stability over temperature variations, which is critical for antenna arrays and phase-sensitive systems.
Technical Specifications
Electrical Property
Value
Impedance
50 Ohms
Velocity of Propagation
88%
Capacitance
23.1 pF/ft (75.8 pF/m)
Max Frequency
5.0 GHz
Peak Power
83 kW
DC Resistance (Inner)
0.41 Ohms/1000ft
Mechanical Property
Value
Nominal Size
7/8 inch
Outer Diameter
1.10 inches (27.94 mm)
Inner Conductor
Copper-Clad Aluminum
Outer Conductor
Smooth-wall Aluminum
Jacket
Black PE (Polyethylene)
Min. Bend Radius
10.0 inches (254 mm)
Attenuation & Power Rating (at 20°C)
Because of its 7/8" diameter and solid aluminum shielding, FXL-780 outperforms smaller 400 or 600 series cables significantly at high frequencies.
Frequency (MHz)
Attenuation (dB/100ft)
Avg. Power (kW)
100
0.35
11.20
450
0.81
5.10
900
1.18
3.48
2000
1.88
2.19
3000
2.41
1.71
Installation Notes
Connectors: FXL-780 requires specialized positive-stop connectors (typically N-type or 7/16 DIN) specifically designed for smooth-wall aluminum cable to ensure a watertight and low-PIM (Passive Intermodulation) connection.
Handling: While flexible for its size, care must be taken not to kink the aluminum outer conductor, as this will permanently damage the electrical performance.
