3-1/8″ RF Feeder Cable

For professionals seeking a high-performance, low-loss coaxial cable solution, the HJA318-50A HELICABLE™ 3-1/8″ Air-Dielectric Coaxial Cable stands out as an industry leader. Engineered for superior RF signal transfer and remarkable longevity, even under high transmission power, this cable is an essential component for robust broadcast and telecommunication infrastructures.

The HJA318-50A HELICABLE™ is designed with advanced features that ensure optimal system performance and minimal interference. Its solid outer conductor creates a continuous electromagnetic shield, significantly reducing unwanted interference within your system.

Furthermore, the cable boasts a low VSWR (Voltage Standing Wave Ratio), which directly contributes to its exceptional system performance. Low attenuation is another key characteristic, resulting in incredibly efficient transfer of your valuable RF signal. These combined attributes, along with excellent heat transfer properties, guarantee a long operating life even when subjected to high transmission power levels.

The HJA318-50A features a meticulously designed structure to ensure durability and reliability. It has a 3-1/8″ size and is protected by a durable black polyethylene (PE) jacket. The inner conductor is made of corrugated copper tube, with a diameter of 34.7 mm (1.37 in). The dielectric material is a polyethylene helical strip, measuring 75.2 mm (2.96 in) in diameter. The outer conductor is also constructed from corrugated copper tube, with a diameter of 85.4 mm (3.36 in). The overall jacket diameter is 91 mm (3.58 in), classifying it as an air-dielectric, corrugated cable type.

Electrically, the HJA318-50A HELICABLE™ delivers impressive capabilities. It maintains an impedance of 50±0.5Ω and supports a maximum frequency of 1.55 GHz. With a velocity of 96% and a capacitance of 70 pF/m, this cable is built for efficiency. It boasts a peak power rating of 940 kW and an RF peak voltage of 9.7 kV, making it suitable for even the most demanding applications. The inner conductor has a DC resistance of 0.4Ω/1000m, and the outer conductor has a DC resistance of 0.15Ω/1000m. Expect a typical return loss of 20.8 dB (1.2 VSWR) or better within the typical operating bands.

 

From an environmental standpoint, the HELICABLE™ is halogen-free, contributing to enhanced fire safety. It offers broad temperature resilience, allowing for installation between -40 to 60∘C (-40 to 140∘F) and storage/operation from -45 to 85∘C (-49 to 185∘F). Mechanically, it’s robust, with a nominal weight of 3.54 Kg/m. Its minimum single bending radius is 380 mm (15 in), while for repeated bends, it’s 1100 mm (43 in). The cable has a tensile strength of 180 N and a bending moment of 215 Nm. Recommended clamp spacing is 0.8/1.2 m (2.6/3.9 ft), with a maximum hoisting grip spacing of 61 m (200 ft). Choose the HJA318-50A HELICABLE™ for a superior and reliable coaxial cable solution for your critical infrastructure.