What is LMR-400-FR Cable?

The LMR-400-FR cable is a 50-ohm, low-loss coaxial cable specifically designed with a fire-retardant, low-smoke, non-halogen FRPE jacket. This construction makes it ideal for indoor riser and CMR-rated projects where fire safety and low smoke emissions are essential. It features double shielding for 90 dB RF interference protection, a solid copper conductor, and a flexible profile, offering outstanding performance for building runs, wireless systems, and laboratory setups.​

Key Features

• FRPE jacket: fire-retardant, low smoke, non-halogen rated​

• UL/NEC CMR, CSA FT4, and FAA FAR25 compliant​

• Double shielded for 90 dB RF shielding​

• Signal attenuation as low as 5.1 dB/100 ft @ 1.5 GHz, max frequency up to 5.8 GHz​

• Flexible with 1-inch minimum install bend radius​

• Diameter: 0.405 inches (10.29 mm)

LMR-400-FR Cable vs Standard RG Cables

The LMR-400-FR cable far exceeds standard RG cables such as RG-213 and RG-8 in safety, attenuation, and RF shielding. This is especially critical in indoor installations where regulatory compliance for fire and smoke is mandatory. While RG cables often lack fire-retardant certifications and experience higher signal loss, the LMR-400-FR cable combines superior signal integrity with strict safety compliance, making it the preferred choice for indoor and riser-rated environments.