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LMR 400 Coax Cable

LMR 400 Coax Cable

LMR-400 Low Loss Coax

Flexible Low Loss Coaxial Cable


What is LMR 400?

Times Microwave LMR-400 is UV resistant coax cable. This low loss cable is built for outdoor exposure and flexible applications. Uses standard LMR 400 coax connectors. For more information see the links below.


Low Loss Coax Applications

  • LMR 400 is designed for jumper assemblies in wireless communications systems or as a drop-in replacement for RG8/9913 air-dielectric type cable.
  • For use in short antenna feeder runs.
  • Suitable for applications that require easily-routed, low loss RF cable (ex. WLL, GPS, LMR, WLAN, WISP, WiMax, SCADA, Mobile Antennas).
  • LMR-400-FR carries a MSHA-P rating for mining operations and meets FAA FAR25 requirements.
  • Depending on your type of application, LMR 400 coax cables are available for outdoor, outdoor/watertight, indoor-riser (CMR rated cables) or indoor/outdoor use.
  • Click on the part links below for individual specs.

LMR-400 Construction:

  • Inner Conductor: Solid Bare Copper Coated Aluminum
  • Dielectric: Foam Polyethylene (FPE)
  • Outer Conductor: Aluminum Tape
  • Outer Braid: Tinned Copper
  • Jacket: Specified per part, see chart below

Times Microwave LMR 400 Coax Ratings:

  • Temperature:
    • Installation: -40°C to 85°C
    • Storage: -70°C to 85°C
    • Operating: -40°C to 85°C
  • Voltage Rating: 2500 volts
  • UL/NEC Type CMR (LMR-400-FR and LMR-400-FR-PVC only)
  • CSA FT4 (LMR-400-FR and LMR-400-FR-PVC only)

Features and Benefits:

  • Flexibility & Bending: LMR-400 is designed with a flexible outer conductor, enabling the tightest bend radius of any cable of similar size and performance.
  • Low Loss: LMR 400 features the lowest loss of any flexible cable, comparable to the loss of semirigid hard-line cables.
  • RF Shielding: 50 dB greater than a typical single shielded coax (40 dB) - multi-ply bonded foil outer conductor rated conservatively at 90 dB
  • Weatherability: Approved for outdoor exposure and is UV resistant. LMR 400 coax offers a life expectancy of over 20 years.

LMR400 Standard Connectors:


See chart below and individual LMR 400 coaxial cable specifications for full details.

Loss Attenuation Specifications by Frequency

Frequency (MHz) Attenuation (db per 100 feet)
30 0.7
50 0.9
150 1.5
220 1.9
450 2.7
900 3.9
1500 5.1
1800 5.7
2000 6.0
2500 6.8
5800 10.8

Power Handling by Frequency

Frequency (MHz) Power (watts)
30 3.33
50 2.57
150 1.47
220 1.20
450 0.83
900 0.58
1500 0.44
1800 0.40
2000 0.37
2500 0.33
5800 0.21


Part Number Jacket MaterialApplicationColor
LMR-400-LSZH Low Smoke Zero Halogen (LSZH) Polyethylene (PE) Low Smoke Zero Halogen Black
LMR-400 Polyethylene (PE) Outdoor Black
LMR-400-DB Polyethylene (PE) Outdoor/Watertight Black
LMR-400-FR Flame Retardant Halogen-Free (LSZH) Polyethylene (FRPE) Indoor/Outdoor Riser CMR Black
LMR-400-FR-PVC Flame-Retardant Polyvinylchloride (FR-PVC) Indoor/Outdoor Riser CMR Black
LMR-400-PVC Polyvinylchloride (PVC) General Purpose Black
LMR-400-PVC-W Polyvinylchloride (PVC) General Purpose White