4-4 Site Preparation
4 RF Attenuation Requirements
Calculating Site Attenuation
To obtain the necessary attenuation at the installation site you can increase the
distance between the equipment and the property boundary or you can add walls
or other attenuating structures:
• Required Site Attenuation (R)
R = Target Site Attenuation – Site Allowance
Where:
• Target Site Attenuation = 15 dB
• Site Allowance for your site = ____________
• The distance from the equipment to the property boundary (D) can be
calculated as follows:
D = 30 or 30*log
-1
((R – n * W)/20) whichever is greater.
Where:
• R = Required Site Attenuation
• n = Number of concrete walls between equipment and property boundary.
• W= Attenuation of the wall (a concrete wall without openings has an
attenuation of 10 dB)
• Additional attenuation (X) due to a D greater than 30 meters.
X = 20log(D/30)
Where:
• D = distance from equipment to property boundary.
• Total attenuation (A) is calculated as follows:
A = X + n * W
Where:
• X = Additional Attenuation
• n = Number of concrete walls between equipment and property boundary.
• W= Attenuation of the wall (a concrete wall without openings has an
attenuation of 10 dB)
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