What are LMR 100 Coaxial Cables?

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- everything RF

Mar 14, 2023

LMR 100 Coaxial Cables are a type of cable that has been designed to offer flexibility, low loss, RF shielding, and resistance against weather conditions. It is used to carry high frequency RF signals and provides the tightest bend radius for any cable with similar size and performance, while maintaining lower loss.

LMR 100A Coaxial Cable

LMR 100A Coaxial Cable Construction

The LMR 100A is a 50-ohm, low-loss, flexible, double-shielded coaxial cable with an overall diameter of 0.110 inches, developed by Times Microwave Systems, and has a voltage rating of up to 500 VDC. It has an internal solid bare copper covered steel (BCCS) conductor (carrying the electrical signal), which is enclosed by an insulation layer made of solid Polyethylene (PE). The insulation layer is then completely enclosed by two shield layers. The first shielding layer is made of aluminum tape while the outer shield is made of a tinned copper braid. The shields form an outer conductor, which also provides protection from electromagnetic interference (EMI). Finally, the structure is covered with an outermost layer - called a jacket - made of FRPE/PVC/TPE/PUR.  The jacket protects the cable core from mechanical, moisture, chemical issues, and other environmental factors.

The LMR 100A cable exhibits capacitance of approximately 30.8 pF/ft (101.1 pF/m), a signal attenuation of around 22.8 dB/100 ft at 900 MHz (signal attenuation of the cable depending on the frequency), and has a velocity of propagation of 66%. It has a center conductor measuring 0.018 inches (0.46 mm) in diameter and an insulation layer measuring 0.060 inches (1.52 mm) in diameter. The double shielding structure of the LMR 100A coax cable offers RF shielding of more than 90 dB.

This flexible, low-loss cable is ideal for use in jumper assemblies present in wireless communications systems, short antenna feeder runs,  drop-in replacement for RG-316/RG-174 (uses standard connectors), and any application (e.g., WLL, GPS, LMR, WLAN, WISP, WiMax, SCADA, Mobile Antennas) requiring an easily routed, low loss RF cable.

Key Specifications of LMR 100A Coaxial Cables


Typical value

Overall Diameter (inch)


Characteristic Impedance (Zo)

50 ohms

Maximum Voltage Rating (VDC)


Cable Capacitance (pF/ft)


Inductance (µH/ft)


Attenuation (dB/100 ft, @ 900 MHz)



Solid Polyethylene (PE)

Minimum Bend Radius (inch)


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