I0JXX Superflexy 7 flexible coax for HF VHF UHF use
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I0JXX Antennas – Coaxial Cables & Accessories.

I0JXX Superflexy 7 Coaxial Cable – Ultra-Low Loss 50Ω Coaxial Cable for HF, VHF & UHF | Radioworld UK

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Product code: SUPERFLEXY-7-per-1
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I0JXX Superflexy 7 flexible coax for HF VHF UHF use

I0JXX Superflexy 7 Coaxial Cable – Ultra-Low Loss 50Ω Coaxial Cable for HF, VHF & UHF | Radioworld UK


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The I0JXX Superflexy 7 is a premium low-loss 50Ω coaxial cable designed for HF, VHF, UHF, and microwave applications where high performance, flexibility, and reliability are essential.

Manufactured in Italy by I0JXX Antennas, the Superflexy 7 features a stranded copper conductor (19 × 0.38 mm), triple shielding, and a UV-resistant PVC jacket, ensuring durability in both fixed and portable installations.

With its 7.3 mm outer diameter, excellent screening efficiency (>105 dB, Class A++), and low attenuation, the Superflexy 7 is ideal for base station feedlines, rotator loops, amplifier connections, and SDR systems requiring top-tier coaxial performance.

The skin/foam/skin polyethene dielectric ensures a velocity ratio of 83% and superb phase stability, while maintaining low capacitance (75 pF/m). With maximum power handling of up to 8,000 W (1.8 MHz) and operating temperatures from –40°C to +60°C, this cable delivers reliable long-term operation in all conditions.

The Superflexy 7 offers attenuation comparable to larger, heavier coax cables, but in a lighter, more manageable design — a perfect balance of performance and flexibility.

Key Features

  • High-quality 50Ω coaxial cable for HF, VHF, UHF & microwave use

  • Outer diameter: 7.3 ± 0.2 mm – compact and flexible

  • Stranded copper conductor (19 × 0.38 mm) for maximum flexibility

  • Triple shielding: CU/PET foil (100%) + 83% copper braid

  • Screening efficiency: >105 dB (Class A++)

  • Ultra-low loss and high power handling: up to 8 kW at 1.8 MHz

  • Velocity factor: 83% – stable across all frequencies

  • Capacitance: 75 ± 2 pF/m

  • Minimum bend radius: 40 mm (single) / 70 mm (multiple)

  • Operating temperature range: –40°C to +60°C

  • UV-resistant black PVC jacket for outdoor and indoor applications

  • Manufactured in Italy by I0JXX Antennas

Technical Specifications

SpecificationDetails
ModelSuperflexy 7
Impedance50 ± 3 Ω
Outer Diameter7.3 ± 0.2 mm
Inner ConductorStranded copper (19 × 0.38 mm)
DielectricSkin/Foam/Skin PE, Ø 5.0 ± 0.15 mm
ShieldingCU/PET foil (100%) + Copper braid (83%)
Outer SheathBlack PVC (UV-resistant)
Capacitance75 ± 2 pF/m
Velocity Ratio83%
DC Resistance (Inner/Outer)7.3 / 9.8 Ω/km
Screening Efficiency>105 dB (Class A++)
SRL (Structural Return Loss)>28 dB (0.3–600 MHz), >22 dB (600–1200 MHz), >18 dB (1200–2000 MHz)
Minimum Bend Radius (Single/Multiple)40 / 70 mm
Operating Temperature Range–40°C to +60°C
Voltage Withstand4.0 kV
Copper Content40.2 kg/km
Cable Weight69.9 kg/km
Max Peak Power8,000 W
ManufacturerI0JXX Antennas, Italy

Attenuation (20°C) & Power Handling (40°C)

Frequency (MHz)Attenuation (dB/100m)Max Power (W)
1.80.954572
3.51.283393
71.602714
101.902286
142.201974
212.601670
283.001448
504.001086
1005.80749
1446.90629
2008.20530
40011.80368
100019.30225
300036.20120
600055.3079

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