RF Conversion Tables


  • Conversion of Power
  • Calculated Signal Levels
  • RF Conversion Table

Conversion of Power (watts to dBm)

Micro watts

Power (dBm)

 Micro watts Power (dBm) Milli watts Power (dBm) Milli watts Power (dBm) Watts Power (dBm)
1 -30.00 100 -10.00 1 0.00 100 +20.00 1 +30.00
2 -26.99 125 -9.03 2 +3.01 125 +20.97 2 +33.01
3 -25.23 150 -8.24 3 +4.77 150 +21.76 3 +34.77
4 -23.98 175 -7.57 4 +6.03 175 +22.43 4 +36.02
5 -23.01 200 -6.99 5 +6.99 200 +23.01 5 +36.99
6 -22.22 225 -6.48 6 +7.78 225 +23.52 6 +37.78
7 -21.55 250 -6.02 7 +8.45 250 +23.98 7 +38.45
8 -20.97 275 -5.61 8 +9.03 275 +24.39 8 +39.03
9 -20.46 300 -5.23 9 +9.54 300 +24.87 9 +39.54
10 -20.00 325 -4.88 10 +10.00 325 +25.12 10 +40.00
15 -18.24 350 -4.56 15 +11.76 350 +25.44 15 +41.76
20 -16.99 375 -4.26 20 +13.01 375 +24.74 20 +43.01
25 -16.02 400 -3.98 25 +13.98 400 +26.02 25 +43.98
30 -15.23 425 -3.72 30 +14.77 425 +26.28 30 +44.77
35 -14.56 450 -3.47 35 +15.44 450 +26.53 35 +45.44
40 -13.98 475 -3.23 40 +16.02 475 +26.77 40 +46.02
45 -13.47 500 -3.01 45 +16.53 500 +26.99 45 +46.53
50 -13.01 525 -2.80 50 +16.99 525 +27.20 50 +46.99
55 -12.60 550 -2.60 55 +17.40 550 +27.40 55 +47.40
60 -12.22 600 -2.22 60 +17.78 600 +27.78 60 +47.78
65 -11.87 650 -1.87 65 +18.13 650 +28.13 65 +48.13
70 -11.55 700 -1.55 70 +18.45 700 +28.45 70 +48.45
75 -11.25 750 -1.25 75 +18.75 750 +28.75 75 +48.75
80 -10.97 800 -0.97 80 +19.03 800 +29.03 80 +49.03
85 -10.71 850 -0.71 85 +19.29 850 +29.29 85 +49.29
90 -10.46 900 -0.46 90 +19.54 900 29.54 90 +49.54
95 -10.22 950 -0.22 95 +19.78 950 +29.78 95 +49.78
100 -10.00 1000 0.00 100 +20.00 1000 +30.00 100 +50.00

 Calculated signals level for combined multiple inputs

No. of inputs
Input Levels (dBm)
  -50 -45 -40 -35 30 -25 -20 -15 -10 -5 0 5 10
4 -38.0979 -38.979 -33.979 -28.979 -23.979 -18.979 -13.979 -8.979 -3.979 1.021 6.021 11.021 16.021
8 -40.969 -35.969 -30.969 -25.969 -20.969 -15.969 -10.969 -5.969 -0.969 4.031 9.031 14.031 19.031
12 -36.208 -34.208 -29.208 -24..208 -19.208 -14.208 -9.208 -4.208 0.792 5.792 10.792 15.792 20.792
16 -37.959 -32.959 -27.959 -22.959 -17.959 -12.959 -7959 -2.959 2.041 7.041 12.041 17.041 22.041
24 -36.198 -31.198 -26.198 -21.198 -16.198 -11.198 -6.198 -1.198 3.802 8.802 13.802 18.802 23.802
32 -34.949 -29.949 -24.949 -19.949 -14.949 -9.949 -4949 0.051 5.051 10.051 15.051 20.051 25.051
64 -31.939 -21.938 -21.938 -16.938 -11.938 -6.938 -1.938 3.062 8.062 13.062 18.062 23.062 28.062

The above chart calculates the combined signal levels, minus the combiner insertion loss at the input of a passive combiner. It may also be used to determine maximum input levels so as not to exceed the P1dB of the amplifier on an active combiner.

Combiner output equals the input level plus 10 times the log of the number of inputs.

For the purpose of the calculations, the assumption is that all input levels are equal. In reality, this is seldom the case. To assist with overall link budget calculations, use the highest anticipated input level as the point of reference. This will assure not exceeding the P1dB of the active combiner components. On passive combiners, also take into consideration the insertion loss of the combiner from the published spec sheet(s). Conversion Between Degrees and Radians

Conversion of Return Loss to Equivalent VSWR

Return loss

vswr

 Return loss vswr Return loss vswr Return loss vswr
60.00 1.002 21.66 1.18 14.50 1.464 8.00
2.323
55.00 1.004 21.25 1.19 14.41 1.47 7.89
2.35
50.00 1.006 21.00 1.196 14.26 1.48 7.71
2.40
46.06 1.01 20.83 1.20 14.12 1.49 7.53
2.45
45.00 1.011 20.44 1.21 14.00 1.499 7.50
2.458
40.09 1.02 20.08 1.22 13.98 1.50 7.36
2.50
40.00 1.021 20.00 1.222 13.84 1.51 7.20
2.55
39.00 1.023 19.73 1.23 13.71 1.52 7.04
2.60
38.00 1.025 19.50 1.237 13.58 1.53 7.00
2.615
37.00 1.029 19.40 1.24 13.50 1.536 6.90
2.65
36.61 1.03 19.08 1.25 13.45 1.54 6.76
2.70
36.00 1.032 19.00 1.253 13.32 1.55 6.62
2.75
35.00 1.036 18.78 1.26 13.20 1.56 6.50
2.796
34.15 1.04 18.50 1.27 13.08 1.57 6.49
2.80
34.00 1.041 18.22 1.28 13.00 1.577 6.37
2.85
33.00 1.046 18.00 1.288 12.96 1.58 6.25
2.90
32.26 1.05 17.95 1.29 12.85 1.59 6.13
2.95
32.00 1.052 17.69 1.30 12.74 1.60 6.02
3.00
31.00 1.058 17.50 1.308 12.50 1.622 6.00
3.10
30.71 1.06 17.45 1.31 12.21 1.65 5.50
3.236
30.00 1.065 17.21 1.32 12.00 1.671 5.11
3.50
29.42 1.07 17.00 1.329 11.73 1.70 5.00
3.57
29.00 1.074 16.98 1.33 11.50 1.725 4.50
3.946
28.30 1.08 16.75 1.34 11.29 1.75 4.44
4.00
28.00 1.083 16.54 1.35 11.00 1.785 4.00
4.419
27.32 1.09 16.50 1.352 10.88 1.80 3.93
4.50
27.00 1.094 16.33 1.36 10.51 1.85 3.52
5.50
26.44 1.10 16.13 1.37 10.50 1.851 3.50
5.030
26.00 1.106 16.00 1.377 10.16 1.90 3.19
5.55
25.66 1.11 15.94 1.38 10.00 1.925 3.00
5.848
25.00 1.119 15.75 1.39 9.84 1.95 2.92
6.00
24.94 1.12 15.58 1.40 9.54 2.00 2.69
6.50
24.29 1.13 15.50 1.404 9.50 2.007 2.50
7.00
24.00 1.135 15.38 1.41 9.26 2.05 2.25
7.764
23.69 1.14 15.21 1.42 9.00 2.10 2.00
8.724
23.13 1.15 15.04 1.43 8.75 2.15 1.75
9.960
23.00 1.152 15.00 1.433 8.52 2.20 1.50
11.610
22.61 1.16 14.88 1.44 8.50 2.204 1.25
13.921
22.12 1.17 14.72 1.45 8.30 2.25 1.00
17.391
22.00
 1.173 14.56 1.46 8.09 2.30 0.50
34.753