User's Guide

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12
Planning
• Inside antenna gain (IAG): This is the signal boost provided by an interior antenna and is always a positive
number with SureCall antennas.
• Cable loss (CL): This is the signal loss caused by the cable and is always a negative number.
• Splitter loss (SL): This is the signal loss caused by a splitter (used if you are installing multiple antennas).
• Booster gain (AG): Number of decibels of amplication provided by the booster (rated gain less any
attenuation, as described in Chapter 5 of this manual). This is always a positive number.
The signal strength S at an interior antenna equals OSL+OAG+IAG+CL+SL+AG. To calculate the
approximate coverage distance of each antenna:
1. Calculate the signal strength S for the rst interior antenna using the preceding formula.
2. Find the signal strength S for the antenna along the bottom of the graph on the following page.
3. Move straight up the signal strength line to the PCS and cellular curves. 4. Read the approximate
coverage radius on the left.
2-way -3
3-way -5
4-way -6
SL Loss
SC-222W omni dome +3
CM2448W direction panel +7
OAG Gain
20’ SC- 400/SC-240 -1/-2
30’ SC-400/SC-240 -2/-4
50’ SC-400/SC-240 -3/-6
100’ SC-400/SC-240 -4/-8
CL Loss