User guide

Bird Technologies Group TX RX Systems Inc.
Free Space Path Loss Estimator
Frequency in MHz
50 150 170 450 500 800 900
Path Length (miles)
0.1 50.58 60.12 61.21 69.66 70.58 74.66 75.68
0.25 58.54 68.08 69.17 77.62 78.54 82.62 83.64
0.5 64.56 74.10 75.19 83.64 84.56 88.64 89.66
1 70.58 80.12 81.21 89.66 90.58 94.66 95.68
2 76.60 86.14 87.23 95.68 96.60 100.68 101.71
3 80.12 89.66 90.75 99.21 100.12 104.20 105.23
4 82.62 92.16 93.25 101.71 102.62 106.70 107.73
5 84.56 94.10 95.19 103.64 104.56 108.64 109.66
6 86.14 95.68 96.77 105.23 106.14 110.22 111.25
7 87.48 97.02 98.11 106.57 107.48 111.56 112.59
8 88.64 98.18 99.27 107.73 108.64 112.72 113.75
9 89.66 99.21 100.29 108.75 109.66 113.75 114.77
10 90.58 100.12 101.21 109.66 110.58 114.66 115.68
12 92.16 101.71 102.79 111.25 112.16 116.25 117.27
14 93.50 103.04 104.13 112.59 113.50 117.58 118.61
16 94.66 104.20 105.29 113.75 114.66 118.74 119.77
18 95.68 105.23 106.31 114.77 115.68 119.77 120.79
20 96.60 106.14 107.23 115.68 116.60 120.68 121.71
30 100.12 109.66 110.75 119.21 120.12 124.20 125.23
40 102.62 112.16 113.25 121.71 122.62 126.70 127.73
50 104.56 114.10 115.19 123.64 124.56 128.64 129.66
Formula: Path Loss (dB) = 36.6 + 20 log (MHz) + 20 log (miles)