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RP-SMA Extension Cables: 11-FT and Up+

LMR-200 and LMR-400 Coaxial Cables

LMR-200 and LMR-400 are low loss coaxial cables, manufactured simply for the purpose of transmitting radio frequency signals in antenna cables. They are both are suited to a multitude of practical industrial uses including:

  • HDTV deployment,
  • broadband internet networks,
  • CCTV,
  • video.

Before we delve into the detail of the product, let's define what a low loss coaxial cable is: The composition of a typical coaxial cable is as such:

  1. Copper clad-steel conductor - low impedance and high tensile strength conducting wire
  2. Dielectric PE foam - relatively minimal absorption of electrical charge
  3. Double shielding - both aluminium foil and braided copper for the blocking out of any environmental signal disturbance
  4. Outer Jacket - protective casing which can carry the properties of being UV stable, flame retardant which is ideal for both indoor and outdoor environments, from the day of installation for years to come.

The following is a simple head-to-head comparison between LMR400 and LMR200 low loss RF coaxial cables:


1. Inner conductor

  • LMR-200 conductor: under 1.42 mm in diameter
  • LMR-400 conductor: above 2.74 mm in diameter

2. Dielectric foam diameter & material

  • LMR-200 foam diameter: 3.81 mm, Polyethylene foam
  • LMR-400 cable sheath: 7.24, Polyethylene foam

3. Inner shield

  • LMR-200 inner shield: tinned copper braiding
  • LMR-400 inner shield: (same as above)

4. Outer shield

  • LMR-200 outer shield: aluminium foil
  • LMR-400 outer shield: (same as above)

5. Outer cable sheath diameter, material & color

  • LMR-200 cable sheath: under 6.1 mm in diameter, Polyethylene, black
  • LMR-400 cable sheath: above 10.29 mm in diameter, Thermoplastic elastomer, black

Some other associated physical characteristics of LMR-200 vs LMR-400

Temperature stability = both max. 85-degrees C / min. -40-degrees C, therefore they are suitable to work in extreme hot or cold environments. Bending radius =  a single bend of LMR-200 and LMR-400 have a radii of over 19 mm and under 25 mm respectively. Double bend is over 63 mm for LMR-200 and below 102 mm. Weight = in terms of weight, the LMR-200 at 0.06 kg/m, is just under half as heavy per m than LMR-400 being 0.102 kg/m. Neither cable have any need of a trailing cable, nor do they contain halogen in their material make up.


The following data quantifies the estimated loss of signal strength typically attributed to the LMR-200 and LMR-400:

At 900 MHz

  • LMR-200 = 0.09 dB/ft.
  • LMR-400 = 0.039 dB/ft.

At 2400 MHz

  • LMR-200 = 0.12 dB/ft.
  • LMR-400 = 0.066 dB/ft.

At 3500 MHz

  • LMR-200 = 0.21 dB/ft.
  • LMR-400 = 0.081 db/ft.

At 5800 MHz

  • LMR-200: 0.264 dB/ft.
  • LMR-400:  0.108 dB/ft.

Double shielding benefits

Both cables are double shielded, with aluminium foil (100%) and copper braiding (70%+) for maximum protection of signal from EMI/noise. This combination of shielding method makes for maximum attenuation of noise and annulment of interference.

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