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Coaxial Cable Loss (dB)
per 100'  (30.5m)
  
VHF, UHF, SHF
 
 
 
Cable
Type
144
MHz
220
MHz
450
MHz
915
MHz
1.2
GHz
2.4
GHz
5.8
GHz
RG-174 10.1 12.5 18.1 26.1 30.1 na na
RG-58 5.5 6.9 10.0 14.6 16.9 na na
RG-8X 4.2 5.3 8.0 12.3 14.6 na na
RG-6A (75 ohm) 3.4 4.2 6.3 9.4 11.0 16.7 na
LMR-240 3.0 3.7 5.3 7.6 8.8 12.7 na
RG214 2.7 3.4 5.0 7.5 8.8 13.3 na
RG213 2.4 3.0 4.5 6.7 7.9 12.0 na
RG-8/U 2.4 3.0 4.5 6.7 7.9 12.0 na
9913 1.6 1.9 2.8 4.2 5.2 7.7 13.8
LMR-400 1.5 1.8 2.7 3.9 4.8 6.8 10.8
LDF2   3/8" 1.3 1.6 2.3 3.4 4.2 5.9 8.1
LMR-600 0.95 1.2 1.7 2.5 3.1 4.4 7.3
LDF4    1/2" 0.88 1.0 1.5 2.1 2.5 3.6 6.0
LDF5    7/8" 0.44 0.55 0.81 1.2 1.4 2.1 3.5
LDF6  1 1/4" 0.31 0.39 0.57 0.85 1.0 1.5 2.6
LDF7  1 5/8" 0.28 0.35 0.52 0.77 0.96 1.4 2.5
               
Coaxial Cable Calculator can be found  HERE
 
 
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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