手机信号在空间的损耗及对照表
信号在空气中传输是有损耗的，频率越高损耗越大。所以一般军用的频率都很低，无线广播频率频率100MHz左右所以比手机频率800MHz以上传输更远。
所以同样的功率GSM900MHz的手机信号增强器效果要比WCDMA2100MHz的效果更好。
为什么23dBm的手机信号增强器主机比20dBm的功率高一倍,却在室内安装效差不多呢？
答：如果安装在室内，信号在线材中就损耗掉了，强3个dBm普通的线也就多接10几米而已。
所以在室内安装两台20dBm（100mW）的主机效果一般都会超过一台33dBm（2W）的主机。但在室外就不一样了，如果下表，10000米损耗约111dB,20000米损耗约为117dB,6dBm的功率就多了10000米。
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信号空间损耗对照表
信号空间损耗公式：Lbs =32.45+20lgF(MHz)+20lgD(km)
| 信号空间损对照表: |
|
900MHz |
1800MHz |
1900MHz |
2100MHz |
2400MHz |
| 距离(米) |
损耗dB |
损耗dB |
损耗dB |
损耗dB |
损耗dB |
| 1 |
31.45 |
37.56 |
38.03 |
38.89 |
40.05 |
| 2 |
37.47 |
43.58 |
44.05 |
44.91 |
46.07 |
| 3 |
40.99 |
47.10 |
47.57 |
48.43 |
49.59 |
| 4 |
43.49 |
49.60 |
50.07 |
50.93 |
52.09 |
| 5 |
45.43 |
51.54 |
52.01 |
52.87 |
54.03 |
| 6 |
47.01 |
53.12 |
53.59 |
54.45 |
55.61 |
| 7 |
48.35 |
54.46 |
54.93 |
55.79 |
56.95 |
| 8 |
49.51 |
55.62 |
56.09 |
56.95 |
58.11 |
| 9 |
50.53 |
56.64 |
57.11 |
57.97 |
59.13 |
| 10 |
51.45 |
57.56 |
58.03 |
58.89 |
60.05 |
| 20 |
57.47 |
63.58 |
64.05 |
64.91 |
66.07 |
| 30 |
60.99 |
67.10 |
67.57 |
68.43 |
69.59 |
| 40 |
63.49 |
69.60 |
70.07 |
70.93 |
72.09 |
| 50 |
65.43 |
71.54 |
72.01 |
72.87 |
74.03 |
| 60 |
67.01 |
73.12 |
73.59 |
74.45 |
75.61 |
| 70 |
68.35 |
74.46 |
74.93 |
75.79 |
76.95 |
| 80 |
69.51 |
75.62 |
76.09 |
76.95 |
78.11 |
| 90 |
70.53 |
76.64 |
77.11 |
77.97 |
79.13 |
| 100 |
71.45 |
77.56 |
78.03 |
78.89 |
80.05 |
| 200 |
77.47 |
83.58 |
84.05 |
84.91 |
86.07 |
| 300 |
80.99 |
87.10 |
87.57 |
88.43 |
89.59 |
| 400 |
83.49 |
89.60 |
90.07 |
90.93 |
92.09 |
| 500 |
85.43 |
91.54 |
92.01 |
92.87 |
94.03 |
| 600 |
87.01 |
93.12 |
93.59 |
94.45 |
95.61 |
| 700 |
88.35 |
94.46 |
94.93 |
95.79 |
96.95 |
| 800 |
89.51 |
95.62 |
96.09 |
96.95 |
98.11 |
| 900 |
90.53 |
96.64 |
97.11 |
97.97 |
99.13 |
| 1000 |
91.45 |
97.56 |
98.03 |
98.89 |
100.05 |
| 2000 |
97.47 |
103.58 |
104.05 |
104.91 |
106.07 |
| 3000 |
100.99 |
107.10 |
107.57 |
108.43 |
109.59 |
| 4000 |
103.49 |
109.60 |
110.07 |
110.93 |
112.09 |
| 5000 |
105.43 |
111.54 |
112.01 |
112.87 |
114.03 |
| 6000 |
107.01 |
113.12 |
113.59 |
114.45 |
115.61 |
| 7000 |
108.35 |
114.46 |
114.93 |
115.79 |
116.95 |
| 8000 |
109.51 |
115.62 |
116.09 |
116.95 |
118.11 |
| 9000 |
110.53 |
116.64 |
117.11 |
117.97 |
119.13 |
| 10000 |
111.45 |
117.56 |
118.03 |
118.89 |
120.05 |
| 20000 |
117.47 |
123.58 |
124.05 |
124.91 |
126.07 |
| 30000 |
120.99 |
127.10 |
127.57 |
128.43 |
129.59 |
| 40000 |
123.49 |
129.60 |
130.07 |
130.93 |
132.09 |
| 50000 |
125.43 |
131.54 |
132.01 |
132.87 |
134.03 |
| 60000 |
127.01 |
133.12 |
133.59 |
134.45 |
135.61 |
| 70000 |
128.35 |
134.46 |
134.93 |
135.79 |
136.95 |
| 80000 |
129.51 |
135.62 |
136.09 |
136.95 |
138.11 |
| 90000 |
130.53 |
136.64 |
137.11 |
137.97 |
139.13 |
| 100000 |
131.45 |
137.56 |
138.03 |
138.89 |
140.05 |
手机信号在空间的损耗及对照表.pdf
