LMR-100 Coax for Antenna Cables: Shielding & Structure

LMR-100 is a low loss, double-shielded coaxial cable type that is Data Alliance's standard for short versions of antenna cables with all of the following connector types:  RP-SMASMAN-type connectorRP-TNCMMCX, 50 Ohm BNC connectors, and FME

LMR100 Structure Diagram showing double shielding for low signal loss

LMR 100's range of frequency band compatibility (from 0 to 18GHz) and 50 Ohms impedance matching, makes it suitable and compliant for all the following applications:

The LMR-100 shares similarities to LMR-200 and LMR-400 coax cable types:

  1. Copper clad-steel conductor - the industry standard carrier of that important RF signal
  2. Dielectric PE foam - an highly effective dampener of any signal seepage throughout the cable
  3. Double shielded - aluminium sheet plus copper braiding equals a well contained conveyor of charge
  4. Outer Jacket - strong, sturdy, robust and ready for almost any environment

LMR-100 & LMR-200 comparison of attenuation (signal loss).

Composition of the LMR-100 coaxial cable::

  • 1. Inner conductor:  0.46 mm (0.02 in) in diameter
  • 2. Dielectric foam diameter & material:  1.52 mm (0.01 in), Polyethylene foam
  • 3. Inner shield:  Aluminium tape
  • 4. Outer shield:  Copper braiding
  • 5. Outer cable sheath diameter, material & color:  2.79 mm (0.1 in) in diameter, Polyvinyl chloride, black.

Other Specifications

Temperature stability = materially stable and functional up to 85-degrees C / and uninhibited by temperatures as low as -40-degrees C. A good multipurpose player in the coax stakes.

Bending radius =  if you bend this cable you can expect a bending radius of 25.4 mm (0.25 in).

Weight = in case you were looking to meticulously plan the practicalities of using LMR-100 on your next project, take a note of the average weight: 0.02kg/m (0.013 lbs/ft.).

Observing safety standards the LMR-100 was made halogen-free, so will not liberate toxins in case of fire.


LMR-100 has low attenuation (low signal loss) for a coax of it's narrow diameter, retaining consistent signal over length. Attenuation in various frequency bands:

  • At 900 MHz:  LMR-100 = 0.75 dB/m. (0.228 dB/ft.)
  • At 2400 MHz:  LMR-100 = 1.28 dB/m. (0.389 dB/ft.)
  • At 3500 MHz:  LMR-100 = 1.58 dB/m. (0.48 dB/ft.)
  • At 5800 MHz:  LMR-100: 2.10 dB/m. (0.641 dB/ft.)

Double shielding benefits

  • In environments where you have significant amounts of EMI, the double shielding nature of the LMR-100 makes it a winner.
  • The combination of a aluminium layer and copper braiding makes it effective even amidst other high load equipment.

Posted by George Hardesty on 20th Oct 2019

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