Cable
Loss
vs.
Frequency |
Times Fiber T10 Drop
Cable
Maximum Losses @ 68 deg.F |
CommScope
Parameter III Nominal Cable Attenuation
at 68 degrees Farenheit
in dB per 100 feet by cable sizes |
| RG-59 |
RG-6 |
RG-11 |
.412" |
.500" |
.625" |
.750" |
.875" |
1.000" |
| 5
MHz |
0.77 |
0.57 |
0.36 |
0.20 |
0.16 |
0.12 |
0.10 |
0.09 |
0.08 |
| 30
MHz |
1.45 |
1.15 |
0.75 |
0.50 |
0.38 |
0.31 |
0.25 |
0.23 |
0.21 |
| 50
MHz |
1.78 |
1.48 |
0.93 |
0.63 |
0.50 |
0.40 |
0.33 |
0.28 |
0.27 |
| 220
MHz |
3.60 |
2.87 |
1.83 |
1.38 |
1.08 |
0.87 |
0.72 |
0.62 |
0.62 |
| 300
MHz |
4.27 |
3.43 |
2.17 |
1.63 |
1.26 |
1.02 |
0.85 |
0.73 |
0.72 |
| 400
MHz |
4.88 |
4.00 |
2.53 |
1.90 |
1.47 |
1.18 |
0.99 |
0.86 |
0.84 |
| 450
MHz |
5.30 |
4.28 |
2.69 |
2.05 |
1.56 |
1.26 |
1.06 |
0.91 |
0.90 |
| 550
MHz |
5.90 |
4.51 |
3.01 |
2.25 |
1.75 |
1.41 |
1.19 |
1.03 |
1.01 |
| 600
MHz |
6.18 |
4.98 |
3.16 |
2.36 |
1.83 |
1.48 |
1.23 |
1.08 |
1.06 |
| 750
MHz |
6.96 |
5.62 |
3.58 |
2.55 |
2.04 |
1.66 |
1.38 |
1.21 |
1.21 |
| 865
MHz |
7.54 |
6.09 |
3.90 |
2.84 |
2.20 |
1.77 |
1.49 |
1.30 |
1.34 |
| 1000
MHz |
8.09 |
6.54 |
4.23 |
3.05 |
2.41 |
1.95 |
1.62 |
1.42 |
1.44 |
Don't forget Cable Loss and
Temperature: % change in cable loss = 1.1% per
10°F
change in cable loss (in dB) =
standard loss x % change in cable loss
If the standard loss is 22 dB at
70°F and the temperature drops to -40°F, the loss of 22 dB at
70°F, becomes 19.58 dB at -40°F.
Changes in cable loss accumulate over multiple cable spans
and can cause performance degradation if not controlled by AGC/ASC
units.
SLJones Communications
PS:
Mr. Thomas GM\CE: Why is this
topic in the "Administrative" forum
?
