Santa Clara County ARES/RACES
Home Operations Data Training and Events Reference Info. FAQ

General Coaxial Feedline Considerations

Summary    |     Details

Summary

A high-level summary is presented here in quick, bulleted form.  More details are provided below. It is important to understand that the recommendations for antennas really apply to any simplex FM station, whether it is used for voice or data communications.

 

Details

Cable Loss

Cable Type

Approx.
Diameter

Shield
Type

Attenuation (db/100 ft)
10 MHz 30 MHz 50 MHz 150 MHz 220 MHz 450 MHz
LMR-240-UF 0.240" foil + braid - 1.6 2.1 3.6 4.4 6.3
LMR-240 0.240" foil + braid 0.8 1.3 1.7 3.0 3.7 5.3
LMR-400-UF 0.405" foil + braid - 0.8 1.1 1.8 2.2 3.3
Belden 9913 0.405" foil + braid 0.5 0.8 1.0 1.6 1.9 2.8
LMR-400 0.405" foil + braid 0.4 0.7 0.9 1.5 1.9 2.7
LMR-600 0.6" foil + braid 0.2 0.4 0.5 1.0 1.2 1.7
RG-8X 0.240" braid 1.0 2.0 2.3 4.7 - 8.6
RG-8/U 0.405" braid 0.5 0.8 1.1 1.8 2.2 3.3
RG-213/U 0.405" braid 0.6 1.2 1.5 2.8 - 5.2
RG-214/U 0.425" braid x 2 0.6 0.9 1.3 2.3 - 4.5
1/2" Heliax Superflex (FSJ4-50B) 0.5" solid 0.3 0.6 0.7 1.3 1.5 2.3
1/2" Heliax (LDF4-50) 0.5" solid 0.2 0.4 0.5 0.8 0.9 1.4
7/8" Heliax (AVA5-50) 0.875" solid 0.1 0.2 0.2 0.4 0.5 0.8

"-" means no data available from the manufacturer. Interpolate to get a rough idea.

Shielding

Center Conductor

Use With HTs

Power Handling

Connectors

Adapters

Weatherproofing Connections

Cable Assemblies

Notes on Some Specific Feedline Configurations


Web Site Home Page

This page was last updated on 12-Sep-2020