L-300 is a 50 Ω mid-size coaxial cable with an overall diameter of 7.62 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.

Several variations are available denoted by suffixes such as -FR for Fire Retardant, -DB for Direct Burial, and -UF for Ultra-Flex.

L-300 cables are occasionally referred to as LMR-300, although the LMR prefix refers to the international trademark of Times Microwave. Each manufacturer will typically use a three letter prefix to reference their own similar variation, such as CNT-300 (for Commscope), KSR-300 (for KingSignal), and so forth.

LMR300 coaxial cable layers

RF Specification

Min. Frequency
0 GHz
Max. Frequency
24.5 GHz
Shielding Effectiveness
> 90 dB
Capacitance
79.1 pF/m
RF Operating Voltage
5000 Vrms
Impedance
50 Ω
Velocity
85%
Attenuation Table
Frequency Attenuation
1000 MHz
0.21 dB/m

Physical Specification

Colour
Black
Min. Bend Radius Static
22.2 mm
Min. Bend Radius Dynamic
76.2 mm
Min. Operating Temperature
-40 °C
Max. Operating Temperature
85 °C
Weight (g/m)
80 g
Cable Layers
Layer Diameter Materials
Inner Conductor
1.78 mm
Dielectric
4.83 mm
Outer Conductor
4.98 mm
Outer Conductor
5.72 mm
Outer Jacket
7.62 mm