Table 5 - Fresnel Zone Calculations
RF Propagation Formulas:
r2 formula: Distance = SQRT(2 / ((4)()(10^(Xn/10)))) { Xn = -dB attenuation}
r4 formula: Distance = SQRT(2 / ((4)()(10^((Xf + Xn)/20)))) { Xf = -dB attenuation at Fresnel Zone}
Table 2 below shows the calculations for distance with 1 dB increments for RF attenuation. The last column in the table shall be filled in with the measurements made when the range test site is characterized.
|
915 MHz
Reference
Distance
|
2450 MHz
Reference
Distance
|
|
Attenuation
(dB)
|
Distance
(Meters)
|
Distance
(Meters)
|
Range Test Site Measurements
(Meters)
|
-1
Use r2 for 900 MHz
and 2.4 GHz
|
0.10
|
0.04
|
|
-2
|
0.12
|
0.04
|
|
-3
|
0.13
|
0.05
|
|
-4
|
0.15
|
0.05
|
|
-5
|
0.16
|
0.06
|
|
-6
|
0.18
|
0.07
|
|
-7
|
0.21
|
0.08
|
|
-8
|
0.23
|
0.09
|
|
-9
|
0.26
|
0.10
|
|
-10
|
0.29
|
0.11
|
|
-11
|
0.33
|
0.12
|
|
-12
|
0.37
|
0.14
|
|
-13
|
0.41
|
0.15
|
|
-14
|
0.46
|
0.17
|
|
-15
|
0.52
|
0.19
|
|
-16
|
0.58
|
0.22
|
|
-17
|
0.65
|
0.24
|
|
-18
|
0.73
|
0.27
|
|
-19
|
0.82
|
0.31
|
|
-20
|
0.92
|
0.35
|
|
-21
|
1.04
|
0.39
|
|
-22
|
1.16
|
0.43
|
|
-23
|
1.31
|
0.49
|
|
-24
|
1.46
|
0.55
|
|
-25
|
1.64
|
0.61
|
|
-26
|
1.84
|
0.69
|
|
-27
|
2.07
|
0.77
|
|
-28
|
2.32
|
0.87
|
|
-29
|
2.60
|
0.97
|
|
-30
|
2.92
|
1.09
|
|
-31
|
3.28
|
1.22
|
|
-32
|
3.68
|
1.37
|
|
-33
|
4.13
|
1.54
|
|
-34
|
4.63
|
1.73
|
|
-35
|
5.20
|
1.94
|
|
-36
|
5.83
|
2.18
|
|
-37
|
6.54
|
2.44
|
|
-38
|
7.34
|
2.74
|
|
-39
|
8.24
|
3.08
|
|
-40
|
9.24
|
3.45
|
|
-41
|
10.37
|
3.87
|
|
-42
|
11.64
|
4.35
|
|
-43
|
13.06
|
4.88
|
|
-44
(= Xf (915 MHz))
Start r4 for 915 MHz
|
14.65
|
5.47
|
|
-45
|
15.52
|
6.14
|
|
-46
|
16.44
|
6.89
|
|
-47
|
17.41
|
7.73
|
|
-48
|
18.44
|
8.67
|
|
-49
|
19.53
|
9.73
|
|
-50
|
20.69
|
10.92
|
|
-51
|
21.92
|
12.25
|
|
-52
|
23.22
|
13.74
|
|
-53
|
24.59
|
15.42
|
|
-54
|
26.05
|
17.30
|
|
-55
|
27.59
|
19.41
|
|
-56
|
29.23
|
21.78
|
|
-57
|
30.96
|
24.44
|
|
-58
|
32.79
|
27.42
|
|
-59
|
34.74
|
30.77
|
|
-60
|
36.80
|
34.52
|
|
-61
(= Xf (2450 MHz))
Start r4 for 2450 MHz
|
38.98
|
38.73
|
|
-62
|
41.29
|
41.03
|
|
-63
|
43.73
|
43.46
|
|
-64
|
46.32
|
46.03
|
|
-65
|
49.07
|
48.76
|
|
-66
|
51.98
|
51.65
|
|
-67
|
55.06
|
54.71
|
|
-68
|
58.32
|
57.95
|
|
-69
|
61.77
|
61.38
|
|
-70
|
65.43
|
65.02
|
|
-71
|
69.31
|
68.87
|
|
-72
|
73.42
|
72.96
|
|
-73
|
77.77
|
77.28
|
|
-74
|
82.38
|
81.86
|
|
-75
|
87.26
|
86.71
|
|
-76
|
92.43
|
91.85
|
|
-77
|
97.91
|
97.29
|
|
-78
|
103.71
|
103.05
|
|
-79
|
109.85
|
109.16
|
|
-80
|
116.36
|
115.63
|
|
-81
|
123.26
|
122.48
|
|
-82
|
130.56
|
129.74
|
|
-83
|
138.29
|
137.42
|
|
-84
|
146.49
|
145.57
|
|
-85
|
155.17
|
154.19
|
|
-86
|
164.36
|
163.33
|
|
-87
|
174.10
|
173.01
|
|
-88
|
184.42
|
183.26
|
|
-89
|
195.35
|
194.12
|
|
-90
|
206.92
|
205.62
|
|
-91
|
219.18
|
217.80
|
|
-92
|
232.17
|
230.71
|
|
-93
|
245.93
|
244.38
|
|
-94
|
260.50
|
258.86
|
|
-95
|
275.93
|
274.20
|
|
-96
|
292.28
|
290.44
|
|
-97
|
309.60
|
307.65
|
|
-98
|
327.95
|
325.88
|
|
-99
|
347.38
|
345.19
|
|
-100
|
367.96
|
365.65
|
|
-101
|
389.77
|
387.31
|
|
-102
|
412.86
|
410.26
|
|
-103
|
437.33
|
434.57
|
|
-104
|
463.24
|
460.32
|
|
-105
|
490.69
|
487.60
|
|
-106
|
519.76
|
516.49
|
|
-107
|
550.56
|
547.09
|
|
-108
|
583.18
|
579.51
|
|
-109
|
617.74
|
613.85
|
|
-110
|
654.34
|
650.22
|
|
-111
|
693.12
|
688.75
|
|
-112
|
734.19
|
729.56
|
|
-113
|
777.69
|
772.79
|
|
-114
|
823.77
|
818.58
|
|
-115
|
872.58
|
867.08
|
|
-116
|
924.28
|
918.46
|
|
-117
|
979.05
|
972.88
|
|
-118
|
1037.06
|
1030.53
|
|
-119
|
1098.51
|
1091.59
|
|
-120
|
1163.60
|
1156.27
|
|
-121
|
1232.55
|
1224.79
|
|
-122
|
1305.59
|
1297.36
|
|
-123
|
1382.95
|
1374.23
|
|
-124
|
1464.89
|
1455.66
|
|
-125
|
1551.69
|
1541.92
|
|
-126
|
1643.64
|
1633.28
|
|
-127
|
1741.03
|
1730.06
|
|
-128
|
1844.19
|
1832.57
|
|
-129
|
1953.46
|
1941.16
|
|
-130
|
2069.21
|
2056.18
|
|
-131
|
2191.82
|
2178.01
|
|
-132
|
2321.70
|
2307.07
|
|
-133
|
2459.27
|
2443.77
|
|
-134
|
2604.99
|
2588.57
|
|
-135
|
2759.34
|
2741.96
|
|
-136
|
2922.84
|
2904.43
|
|
-137
|
3096.03
|
3076.53
|
|
-138
|
3279.48
|
3258.82
|
|
-139
|
3473.81
|
3451.92
|
|
-140
|
3679.64
|
3656.46
|
|
-141
|
3897.67
|
3873.12
|
|
-142
|
4128.63
|
4102.61
|
|
-143
|
4373.26
|
4345.71
|
|
-144
|
4632.39
|
4603.21
|
|
-145
|
4906.88
|
4875.97
|
|
-146
|
5197.63
|
5164.88
|
|
-147
|
5505.61
|
5470.92
|
|
-148
|
5831.84
|
5795.10
|
|
-149
|
6177.40
|
6138.48
|
|
-150
|
6543.43
|
6502.20
|
|
Table 6 - Reference RF Propagation Model Calculations
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