Coaxial Cable Loss (dB)
per 100' (30.5m)
VHF, UHF, SHF
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Cable
Type |
30
MHz |
144
MHz |
220
MHz |
450
MHz |
915
MHz |
1.2
GHz |
2.4
GHz |
5.8
GHz |
RG-174 |
4.5 |
10.1 |
12.5 |
18.1 |
26.1 |
30.1 |
na |
na |
RG-58 |
2.1 |
5.5 |
6.9 |
10.0 |
14.6 |
16.9 |
na |
na |
RG-8X |
1.6 |
4.2 |
5.3 |
8.0 |
12.3 |
14.6 |
na |
na |
| RG-6A (75 ohm) |
1.5 |
3.4 |
4.2 |
6.3 |
9.4 |
11.0 |
16.7 |
na |
| LMR-240 |
1.3 |
3.0 |
3.7 |
5.3 |
7.6 |
8.8 |
12.7 |
na |
RG214 |
1.2 |
2.7 |
3.4 |
5.0 |
7.5 |
8.8 |
13.3 |
na |
RG213 |
1.1 |
2.4 |
3.0 |
4.5 |
6.7 |
7.9 |
12.0 |
na |
RG-8/U |
0.99 |
2.4 |
3.0 |
4.5 |
6.7 |
7.9 |
12.0 |
na |
9913 |
0.68 |
1.6 |
1.9 |
2.8 |
4.2 |
5.2 |
7.7 |
13.8 |
LMR-400 |
0.67 |
1.5 |
1.8 |
2.7 |
3.9 |
4.8 |
6.8 |
10.8 |
LDF2 3/8" |
0.56 |
1.3 |
1.6 |
2.3 |
3.4 |
4.2 |
5.9 |
8.1 |
LMR-600 |
0.42 |
0.95 |
1.2 |
1.7 |
2.5 |
3.1 |
4.4 |
7.3 |
LDF4 1/2" |
0.36 |
0.88 |
1.0 |
1.5 |
2.1 |
2.5 |
3.6 |
6.0 |
LDF5 7/8" |
0.20 |
0.44 |
0.55 |
0.81 |
1.2 |
1.4 |
2.1 |
3.5 |
LDF6 1 1/4" |
0.14 |
0.31 |
0.39 |
0.57 |
0.85 |
1.0 |
1.5 |
2.6 |
LDF7 1 5/8" |
0.28 |
0.28 |
0.35 |
0.52 |
0.77 |
0.96 |
1.4 |
2.5 |
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The above shows approximate loss per
cable type.
Coaxial Cable Loss can vary between manufacturers.
Cable
Loss Calculators can be found at:
Belden, TMS, Andrews
and
TMS
Doubling
power increases your signal 3 decibels.
3db of loss
is equivalent to cutting your power in half.
6db of loss is equivalent to cutting your power in half
again.
Example:
10W with 3db of loss = 5.0W
10W with 6db of loss = 2.5W
10W with 9db of loss = 1.25W |
Cable loss
impacts receive as well as transmit.
Quality cable is a solid investment.
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