User's Manual

CHAPTER 3: Planning
Copyright 2011 Cellphone-Mate, Inc. All rights reserved.
13
3.5 - Calculating Signal Strength
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 location and
will always be a negative 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 positive number with Cellphone-
Mate antennas.
OAG 2500MHz WiMAX
CM288-W omni +3
CM230-W Yagi +10
• Inside antenna gain (IAG): This is the signal
boost provided by an interior antenna and is
always a positive number with Cellphone-
Mate antennas.
• Cable loss (CL): This is the signal loss caused
by the cable and is always a negative number.
IAG 2500MHz WiMAX
CM222-W omni dome +3
CM248-W directional
panel
+7
CL 2500MHz WiMAX
20’ CM400/CM240 -2.5/-5.0
30’ CM400/CM240 -2.5/-5.0
50’ CM400/CM240 -5.0/-10.0
100’ CM400/CM240 -5.0/-10.0