SureCall CM2020 - Calculating Signal Strength

CHAPTER 3: Planning
Copyright 2011 Cellphone-Mate, Inc. All rights reserved.
13
You can calculate the number of antennas you will
need using the following parameters (in dB):
• Outside signal level (OSL): This is the signal
strength at the exterior antenna
and
will always be a
number that will usu-
ally fall between -50 and -100dBm. Calls will
drop at levels of about -100dB and lower.
• Outside antenna gain (OAG): This the signal
boost provided by the exterior antenna and is
always a number with Cellphone-
Mate antennas.
OAG Cellular PCS
CM100-S omni +5 +5
CM100-L omni +9 +9
CM288W omni +3 +3
CM230W Yagi +10 +11
• Inside antenna gain (IAG): This is the signal
boost provided by an interior antenna and is
always a
number with Cellphone-
Mate antennas.
• Cable loss (CL): This is the signal loss caused
IAG Cellular PCS
CM222W omni dome +3 +3
CM223 omni dome +3 +3
l +7 +10
CL Cellular PCS
20’ CM400/CM240 -1/-2 -2/-4
30’ CM400/CM240 -2/-4 -3/-6
50’ CM400/CM240 -3/-6 -4/-8
100’ CM400/CM240 -4/-8 -7/-14