About L-240 Coaxial Cable

L-240, sometimes referred to as LMR-240, is a low loss coaxial cable with a medium sized 6.10 mm outer diameter. This series is without a doubt the most popular choice of RF cable, due to its efficient compromise between performance and cost. 

L-240 cable provides the flexibility and easy installation of a smaller diameter cable, with the low attenuation and shielding advantages of a larger cable. Unlike larger cables, L-240 can pass 5G and mmWave frequencies up to 31 GHz.

The cable is a mid-size with an overall diameter of 6.10 mm, providing a compromise between form-factor/bend radius, and attenuation/power handling. The double shielded outer conductor provides exceptional RF shielding exceeding 90 dB, and PE jacket for a service life in excess of 20 years.

Terminating L-240 coaxial connectors requires a 6.48 mm (.255") hex die.

LMR-240 coaxial cable layers
RF Performance
Operating Freq. Range 0 to 31.0 GHz Input Impedance
50 Ω
Velocity of Propagation
79.40 pF/m
Shielding Effectiveness
> 90 dB
Max. Operating Voltage
5.00 KVrms
Power Handling @ 1 GHz No Data
Physical Characteristics
Min. Bend Radius (Static)
19.10 mm
Weight 50 g/m
Min. Bend Radius (Dynamic)
63.50 mm
Operating Temperature -40 to 85 °C
LayerMaterialOuter Diameter
Inner Conductor
Solid Copper
1.420 mm
Foamed Polyethylene (EPE)
3.810 mm
Outer Conductor
Aluminium Foil
3.940 mm
Outer Conductor
Tinned Copper Braid (TC)
4.520 mm
Outer Jacket
Polyethylene (PE)
6.100 mm