Table: Coax cable attenuation
Coax cable attenuation.
All coax cable looses power. The amount of power loss in a coax cable depends upon the length of the cable, the type of cable, and the frequency it is being used at.
The following tables are helpful for predicting the amount of signal loss through a coax cable. For example, if you use a 50 foot section of LMR-400 cable in your data radio modem system that operates a 450MH, you will loose 1.6dB.
| Cable Group | Attenuation in dB per 100 feet | Outer Diameter (inches) | ||||||
| 30 | 50 | 100 | 150 | 450 | 1000 | 2400 | ||
| LMR-100A® | 3.9 | 5.1 | 7.2 | 8.9 | 15.8 | 24.1 | 38.0 | |
| LMR-200® | 1.8 | 2.3 | 3.2 | 4.0 | 7.0 | 10.4 | 16.5 | 0.195 |
| LMR-240 Ultra® | 1.3 | 1.7 | 2.9 | 3.6 | 5.3 | 9.5 | 12.7 | 0.240 |
| LMR-240® | 1.3 | 1.7 | 2.4 | 3.0 | 5.2 | 7.9 | 12.7 | 0.240 |
| LMR-400 Ultra® | 0.8 | 1.1 | 1.5 | 1.5 | 3.2 | 5.0 | 7.9 | 0.405 |
| LMR-400® | 0.7 | 0.9 | 1.3 | 1.5 | 2.7 | 4.1 | 6.6 | 0.405 |
| RG-174 | 5.5 | 6.6 | 8.8 | 10.3 | 18.1 | 27.4 | 43.0 | 0.100 |
| RG-213 | 1.0 | 1.5 | 2.1 | 2.8 | 4.4 | 7.1 | 12.0 | 0.405 |
| RG-214 | 1.2 | 1.6 | 1.9 | 2.4 | 5.1 | 8.0 | 13.7 | 0.405 |
| RG-316 | 4.3 | 5.6 | 7.9 | 4.4 | 17.2 | 26.1 | 45.0 | 0.110 |
| RG-58A/U | 2.5 | 4.1 | 5.3 | 6.1 | 10.6 | 24.0 | 38.9 | 0.195 |
| RG-8/U FOAM | 1.0 | 1.2 | 1.8 | 2.4 | 4.4 | 7.1 | 12.0 | 0.400 |
| RG-8X | 2.0 | 2.1 | 3.0 | 4.7 | 8.6 | 12.9 | 21.6 | 0.242 |
| RG218/U | 0.4 | 0.6 | 0.8 | 1.0 | 2.0 | 3.8 | 6.4 | 0.870 |
| Cable Group | Attenuation in dB per 100 meters | Outer Diameter (mm) | ||||||
| 30 | 50 | 100 | 150 | 450 | 1000 | 2400 | ||
| LMR-100A® | 12.5 | 16.3 | 23.0 | 28.5 | 50.6 | 77.1 | 121.6 | |
| LMR-200® | 5.8 | 7.4 | 10.2 | 12.8 | 22.4 | 33.3 | 52.8 | 4.95 |
| LMR-240 Ultra® | 4.2 | 5.4 | 9.3 | 11.5 | 17.0 | 30.4 | 40.6 | 6.10 |
| LMR-240® | 4.2 | 5.4 | 7.7 | 9.6 | 16.6 | 25.3 | 40.6 | 6.10 |
| LMR-400 Ultra® | 2.6 | 3.4 | 4.8 | 4.8 | 10.2 | 15.8 | 25.3 | 10.29 |
| LMR-400® | 2.2 | 2.9 | 4.0 | 4.8 | 8.6 | 13.2 | 21.1 | 10.29 |
| RG-174 | 17.6 | 21.1 | 28.2 | 33.0 | 57.9 | 87.7 | 137.6 | 2.54 |
| RG-213 | 3.3 | 4.8 | 6.7 | 9.0 | 14.1 | 22.6 | 38.4 | 10.29 |
| RG-214 | 3.8 | 5.1 | 6.1 | 7.7 | 16.3 | 25.6 | 43.8 | 10.29 |
| RG-316 | 13.8 | 17.9 | 25.3 | 14.1 | 55.0 | 83.5 | 144.0 | 2.79 |
| RG-58A/U | 8.0 | 13.1 | 17.0 | 19.5 | 33.9 | 76.8 | 124.5 | 4.95 |
| RG-8/U FOAM | 3.3 | 3.8 | 5.8 | 7.7 | 14.1 | 22.7 | 38.4 | 10.16 |
| RG-8X | 6.4 | 6.7 | 9.6 | 15.0 | 27.5 | 41.3 | 69.1 | 6.15 |
| RG218/U | 1.3 | 1.8 | 2.6 | 3.3 | 6.5 | 12.2 | 20.5 | 22.10 |
