Free space path loss estimator – Bird Technologies 11-70 Series User Manual
Page 18
Bird Technologies Group TX RX Systems Inc.
Free Space Path Loss Estimator
Frequency in MHz
50
150
170
450
500
800
900
P
a
th
Le
n
g
th
(
m
ile
s)
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)