9440end1-2.pdf, Return loss vs. vswr, Watts to dbm – Bird Technologies 429-83H-01 Series-Installation Instructions User Manual
Page 11: Insertion loss, Free space loss
Return Loss vs. VSWR
Return Loss
VSWR
30
1.06
25
1.11
20
1.20
19
1.25
18
1.28
17
1.33
16
1.37
15
1.43
14
1.50
13
1.57
12
1.67
11
1.78
10
1.92
9
2.10
Watts to dBm
Watts
dBm
300
54.8
250
54.0
200
53.0
150
51.8
100
50.0
75
48.8
50
47.0
25
44.0
20
43.0
15
41.8
10
40.0
5
37.0
4
36.0
3
34.8
2
33.0
1
30.0
dBm = 10log P/1mW
Where P = power (Watt)
Insertion Loss
Input Power (Watts)
50
75
100
125
150
200
250
300
3
25
38
50
63
75
100
125
150
2.5
28
42
56
70
84
112
141
169
2
32
47
63
79
95
126
158
189
1.5
35
53
71
88
106
142
177
212
1
40
60
79
99
119
159
199
238
.5
45
67
89
111
134
178
223
267
Output Power (Watts)
Ins
e
rt
ion
Los
s
Free Space Loss
Distance (miles)
.25
.50
.75
1
2
5
10
15
150
68
74
78
80
86
94
100
104
220
71
77
81
83
89
97
103
107
460
78
84
87
90
96
104
110
113
860
83
89
93
95
101
109
115
119
940
84
90
94
96
102
110
116
120
1920
90
96
100
102
108
116
122
126
Free Space Loss (dB)
Free space loss = 36.6 + 20log D + 20log F
Where D = distance in miles and F = frequency in MHz
F
req
uen
cy
(
M
Hz
)