Figure 2. Heliax FXL cable is available in different sizes. The outer conductor is smoothwall aluminum, the inner conductor is copper, and the dielectric is foam PE. The matching connector is an EZfit.

The Heliax FXL-780 cable features an outer diameter of 0.875 in., a characteristic impedance of 50 Ω, cable capacitance of 23 pF/foot, a velocity factor of 0.88, a cable weight of 0.25 lb/ft, and a dc test voltage of 6 kV. Its operating frequency range is 800 to 2500 MHz with a VSWR of 1.1 and a return loss of 26.4 dB. Typical attenuation is 1.192 dB/100 ft.

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