User Manual

Help Hot Line (U.S. only): 1-800-530-9960 6-21
D-620616-0-20 Rev G CONFIDENTIAL
Estimating RF Coverage
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
(4Sf/c))/PLS)(4)
For reference, Tables 6-24 through 6-29 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)
Table 6-23 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
Moderately Dense Environment
medium-to-high amount of RF
obstructions
Office Space with approx-
imately 50% cubicles and
50% hard walled of
fices
37.6 34.8
Dense Environment
large amount of RF obstructions
Hospital, Office Space
with approximately 20%
cubicles and 80% hard
walled of
fices
39.4 38.1
Table 6-22 Estimated Path Loss Slope for Different In-Building Environments
Environment Type Example
PLS for
850/900 MHz
PLS for 1800/1900/
2100/2500 MHz