User's Manual

Estimating RF Coverage
6-18 InterReach Fusion Wideband Installation, Operation, and Reference Manual
CONFIDENTIAL D-620616-0-20 Rev D
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.
d = 10^((APL - 20log
10
(4πf/c))/PLS) (4)
For reference, Tables 6-19 through 6-24 show the distance covered by an antenna for
various in-building environments. 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 = –85 dBm (typical for narrowband protocols, but not for
spread-spectrum protocols)
Moderately Dense Environment
medium-to-high amount of RF
obstructions
Office Space with approx-
imately 50% cubicles and
50% hard walled offices
37.6 34.8
Dense Environment
large amount of RF obstructions
Hospital, Office Space
with approximately 20%
cubicles and 80% hard
walled offices
39.4 38.1
Table 6-18 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 6-19 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
Table 6-17 Estimated Path Loss Slope for Different In-Building Environments
Environment Type Example
PLS for
850/900 MHz
PLS for 1800/1900/
2100/2500 MHz