User's Manual Part 1

Estimating RF Coverage
InterReach Fusion Wideband Installation, Operation, and Reference Manual Page 85
D-620616-0-20 Rev H • TECP-77-044 Issue 7 • May 2013 © 2013 TE Connectivity Ltd.
Equation4—PathLossEquation
Bysettingthepathlosstothemaximumallowablelevel(PL=APL),Equation3canbeusedto
estimatethemaximumcoveragedistanceofanantennaconnectedtoanRAU,foragiven
frequencyandtypeofin‐buildingenvironment,whichisEquation4.
d=10^((APL‐20log
10
(4/c))/PLS)
Forreference,Table69throughTable75onpage87showthedistancecoveredbyanantennafor
variousin‐buildingenvironments,inwhichthe
followingassumptionsweremade:
• PathLossEquation4
• 6
dBmoutputpercarrierattheRAUoutput
• 3dBiantennagain
• RSSI
designgoalisequalto–85dBm,whichistypicalfornarrowbandprotocols,butnotfor
spread‐spectrumprotocols.
Table69.
ApproximateRadiatedDistancefromAntennafor800MHzSMRApplications
Environment Type Distance from Antenna
Meters Feet
Open Environment 75 244
Moderately Open Environment 64 208
Mildly Dense Environment 56 184
Moderately Dense Environment 48 156
Dense Environment 40 131
Table70. ApproximateRadiatedDistancefromAntennafor850MHzCellularApplications
Environment Type Distance from Antenna
Meters Feet
Open Environment 73 241
Moderately Open Environment 63 205
Mildly Dense Environment 55 181
Moderately Dense Environment 47 154
Dense Environment 39 129