LMR-400 50 Ohm & 75 Ohm Coaxial Cable and Transmission Loss
http://usacoax.com/lmr-400-50-ohm-75-ohm-coaxial-cable-and-transmission-loss/ Using 50 Ohm LMR400 or LMR-240 coaxial cable for your antenna installations will ensure you get the best signal. LMR-400-75 Ohm coax is made for lower freqs like those used in digital audio, and cable TV. While they are sometimes used in Ham Radio cable installations for antenna matching it is only selectively, as required by systems design. The 50 Ohm measurement discussed is a standard of measure for electrical resistance or how easy a signal moves through the conductor. Resistance is determined by cable design, construction and materials used. Ham, CD, and WiFi equipment output signals at 50 Ohms.