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Copyright © 2005
East Greenbush Amateur Radio Association
All Rights Reserved
Coaxial cables are designed to be low loss; however, they are not lossless. The folowing table provides loss figures for several typical types of coaxial cable. In addition to these losses inherent in the cables, other factors, such as connectors in the line and deformities in the uniform roundness of the cable, will also cause losses.
Attenuation in dB per 100 feet*
| Loss* | RG-174 | RG-58 | RG-8X | RG-213 | RG-6 | RG-11 | RF-9914 | RF-9913 |
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* Note: Length is a loss multiplier, so a 200 ft length would have twice the loss shown above, while a 50 ft length would have half the loss. Coax loss is also related to the wavelength, with the lowest losses when the line is an exact multiple of the wavelength. |
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| 1MHz | 1.9dB | 0.4dB | 0.5dB | 0.2dB | 0.2dB | 0.2dB | 0.3dB | 0.2dB |
| 10MHz | 3.3dB | 1.4dB | 1.0dB | 0.6dB | 0.6dB | 0.4dB | 0.5dB | 0.4dB |
| 50MHz | 6.6dB | 3.3dB | 2.5dB | 1.6dB | 1.4dB | 1.0db | 1.1dB | 0.9dB |
| 100MHz | 8.9dB | 4.9dB | 3.6dB | 2.2dB | 2.0dB | 1.6dB | 1.5dB | 1.4dB |
| 200MHz | 11.9dB | 7.3dB | 5.4dB | 3.3dB | 2.8dB | 2.3dB | 2.0dB | 1.8dB |
| 400MHz | 17.3dB | 11.2dB | 7.9dB | 4.8dB | 4.3dB | 3.5dB | 2.9dB | 2.6dB |
| 700MHz | 26.0dB | 16.9dB | 11.0dB | 6.6dB | 5.6dB | 4.7dB | 3.8dB | 3.6dB |
| 900MHz | 27.9 B | 20.1dB | 12.6dB | 7.7dB | 6.0dB | 5.4dB | 4.9dB | 4.2dB |
| 1GHz | 32.0dB | 21.5dB | 13.5dB | 8.3dB | 6.1dB | 5.6dB | 5.3dB | 4.5dB |
| Impedance | 50ohm | 50ohm | 50ohm | 50ohm | 75ohm | 75ohm | 50ohm | 50ohm |
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