I0JXX Flexy 5 stranded copper inner conductor close-up
I0JXX Flexy 5 stranded copper inner conductor close-up
Radioworld UK I0JXX Flexy 5 50Ω coax cable
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I0JXX Flexy 5 stranded copper inner conductor close-up
Radioworld UK I0JXX Flexy 5 50Ω coax cable

I0JXX Antennas – Coaxial Cables & Accessories.

I0JXX Flexy 5 Coaxial Cable – Ultra-Flexible Low-Loss 50Ω Coaxial Cable Per Meter | Radioworld UK

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Product code: SUPERFLEXY-5-per-1
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I0JXX Flexy 5 stranded copper inner conductor close-up

I0JXX Flexy 5 Coaxial Cable – Ultra-Flexible Low-Loss 50Ω Coaxial Cable Per Meter | Radioworld UK


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The I0JXX Flexy 5 is a high-performance 50 ohm coaxial cable engineered for amateur radio, SDR (Software-Defined Radio), and professional RF applications where low loss, flexibility, and reliability are essential.

Manufactured in Italy by I0JXX Antennas, the Flexy 5 features a highly flexible stranded copper conductor (19 x 0.29 mm) combined with triple shielding for maximum signal integrity. Its 5.4 mm outer diameter makes it one of the most compact and efficient low-loss coax cables available, offering the perfect balance between performance and portability.

The Flexy 5 achieves exceptional screening efficiency (>105 dB, Class A++), a velocity factor of 87%, and excellent attenuation characteristics up to 6 GHz, making it suitable for HF, VHF, UHF, and microwave frequencies. Its robust construction — including a CU/PET foil, 88% copper braid, and a UV-resistant PVC outer jacket — ensures a long service life in both indoor and outdoor installations.

With power handling up to 2.9 kW at 1.8 MHz, the I0JXX Flexy 5 is ideal for use with high-performance HF amplifiers, rotator loops, SDR transceivers, and portable antenna systems, where space-saving flexibility and uncompromising performance are required.

Key Features

  • High-quality 50Ω coaxial cable for SDR, HF, VHF, and UHF operation

  • Stranded copper inner conductor (19 x 0.29 mm) for superior flexibility

  • Triple shielding (foil + braid + foil) for exceptional EMI protection (>105 dB)

  • Low-loss performance with attenuation as low as 1.48 dB @ 1.8 MHz

  • Velocity factor of 87% ensures accurate phase and timing control

  • Handles up to 2.9 kW PEP @ 1.8 MHz — ideal for high-power HF use

  • Compact 5.4 mm diameter – easy to route and manage in tight spaces

  • Foamed PE dielectric (skin/foam/skin) for excellent mechanical stability

  • UV- and weather-resistant PVC outer jacket for outdoor durability

  • Perfect for rotator loops, patch leads, portable antennas, and SDR radios

  • Designed and manufactured in Italy by I0JXX Antennas

Technical Specifications

SpecificationDetails
Impedance50 ± 3 Ω
Outer Diameter5.4 ± 0.2 mm
Inner ConductorStranded copper (19 x 0.29 mm)
DielectricSkin/Foam/Skin polyethene
ShieldingCU/PET foil (100%) + Copper braid (88%)
Outer JacketBlack PVC, UV-resistant
Capacitance75 ± 2 pF/m
Velocity Ratio87%
DC Resistance (Inner/Outer)11.0 / 14.0 Ω/km
Screening Efficiency>105 dB (Class A++)
Structural Return Loss (SRL)>28 dB (0.3–600 MHz), >25 dB (600–1200 MHz), >22 dB (1200–2000 MHz)
Minimum Bend Radius (Single/Multiple)25 mm / 50 mm
Operating Temperature Range-40°C to +60°C
Voltage Withstand4.0 kV
Power Handling (Max Peak)2900 W
Weight44 kg/km
Copper Content28.7 kg/km
ManufacturerI0JXX Antennas, Italy

Attenuation @ 20°C

Frequency (MHz)Attenuation (dB/100m)Max Power (W)
1.81.481274
3.51.91987
72.33809
102.63717
143.04620
213.64518
284.16453
505.58338
1008.02235
1449.66195
20011.44165
40016.37115
100026.4671
300048.1039
600072.9226

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