What is LMR 400 Coaxial Cable?

LMR 400 is a type of coaxial cable that is commonly used for high-frequency applications, such as in radio communication systems, wireless networking, and broadband internet.

The “LMR” stands for “Land Mobile Radio,” which indicates its original intended use for mobile radio systems. The “400” refers to the cable’s nominal diameter, which is 0.405 inches or 10.3 millimeters.

LMR 400 coaxial cable is designed to minimize signal loss and interference, and it has a low attenuation and high shielding effectiveness. It has a solid inner conductor made of copper, a dielectric insulation, and an outer layer made of aluminum foil and braided copper shield. The cable is covered by a durable and weather-resistant jacket, which makes it suitable for outdoor use.

LMR 400 is a popular choice for high-power and long-distance applications, as it has a low loss of signal even at high frequencies. It is also easy to install and terminate, and it can support a variety of connector types.