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166
Figure A.5
Radio Link Analysis
Determining the Distance between both sites
Gs = Lt = Ptx + Gtx + Grx –(RS) = (92.4 + 20Log(F) + 20Log(R))+10
Gs = Constant = (36.6 + 20Log(F) + 20Log(R))+10
Calculating Distance (R) between both sites
Case Study
Transmitter: APU, Receiver: CSU
Ptx : 15dBm
Gtx : 7dBi (Omni-directional)
Grx : 18dBi
RS : - 83dBm
F : 2.4 GHz
R: 5 mile
FM: 12 dB (Conventional Setting Value)
Gs = Ptx + Gtx + Grx – (RS)
Gs(Flat Panel) = 15 + 15 + 18 - (-83) = 131
FSL : 36.6 + 20Log(F) + 20Log(R)
FSL = 36.6 + 20Log(2400) + 20Log(5) = 118.2 dB
Lt = FSL + FM
Lt = 118.2 + 12 = 130.2
WLAN Cable Access Point 6220 CSU NTPM99CA Rel 2.0 Issue 5 Dec 2005
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