新日本無線−マイクロ波コンポーネント


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技術サポート/VSAT Components

雑音電力

システムの雑音電力
Ta = degC
kTB = dBm/ Hz
B = Hz   dBW/ Hz
NF = dB Noise = dBm/ Hz
Gain = dB   dBW/ Hz
*式: Noise = kTB + NF +Gain
Noise : Noise Power Density [dBm/Hz]
kTB : Thermal Noise, [dBm/Hz]
k = 1.380 x 10-23 J/K(ボルツマン定数)
T : Temperature [K]
B : bandwidth [Hz]
NF : Noise Figure [dB]
Ta[degC] kTB
[dBm/Hz] [dBm/4kHz] [dBW/Hz] [dBW/4kHz]
-50 -175.1 -139.1 -205.1 -169.1
-45 -175.0 -139.0 -205.0 -169.0
-40 -174.9 -138.9 -204.9 -168.9
-35 -174.8 -138.8 -204.8 -168.8
-30 -174.7 -138.7 -204.7 -168.7
-25 -174.7 -138.6 -204.7 -168.6
-20 -174.6 -138.5 -204.6 -168.5
-15 -174.5 -138.5 -204.5 -168.5
-10 -174.4 -138.4 -204.4 -168.4
-5 -174.3 -138.3 -204.3 -168.3
0 -174.2 -138.2 -204.2 -168.2
5 -174.2 -138.1 -204.2 -168.1
10 -174.1 -138.1 -204.1 -168.1
15 -174.0 -138.0 -204.0 -168.0
20 -173.9 -137.9 -203.9 -167.9
25 -173.9 -137.8 -203.9 -167.8
30 -173.8 -137.8 -203.8 -167.8
35 -173.7 -137.7 -203.7 -167.7
40 -173.6 -137.6 -203.6 -167.6
45 -173.6 -137.6 -203.6 -167.6
50 -173.5 -137.5 -203.5 -167.5
55 -173.4 -137.4 -203.4 -167.4
60 -173.4 -137.4 -203.4 -167.4
65 -173.3 -137.3 -203.3 -167.3
70 -173.2 -137.2 -203.2 -167.2
75 -173.2 -137.2 -203.2 -167.2
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