MPE

FCC ID: HBW1D8088-1

RF Exposure Info

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FCCID_2342890

MPE Calculation
Applicant : Chamberlain Group
Type of Equipment : Frequency Hopper
Model No. : 821LM
FCC ID : HBW1D7991

RF Exposure Calculations:
FCC 2.1091
The following information provides the minimum separation distance for the highest gain antenna provided with the as
calculated from FCC OET Bulletin 65 Appendix A, T able (B) Limits for General Population / Uncontrolled Exposure. This
calculation is based on the highest EIRP possible from the system, considering maximum power and antenna gain, and
considering a 0.6mW/cm^2 uncontrolled exposure limit. The Friis formula used was:

S = (P * G ) / (4* π * r2)
Where
P = 16.285mW (Maximum peak output power)
G = 0.63 Numerical Antenna gain; equal -2 dBi
r = 20.0 cm
For: HBW1D8088-1 S = 0.00204 mW/cm2

Calculated Power Density for WiFi Module: (FCC ID: COFWMNBM11)
The following information provides the minimum separation distance for the highest gain antenna provided with the
as calculated from FCC OET Bulletin 65 Appendix A, T able (B) Limits for General Population / Uncontrolled
Exposure. This calculation is based on the highest EIRP possible from the system, considering maximum power and
antenna gain, and considering a 1.0mW/cm^2 uncontrolled exposure limit. The Friis formula used was:

S = (P * G ) / (4* π * r2)
Where
P = 237mW (Maximum peak output power)
G = 0.631 Numerical Antenna gain; equal -2 dBi
r = 20.0 cm
For: WiFi Module S = 0.595 mW/cm2

Calculated Power Density for BT Module: (FCC ID: COFBMGPBR65)
The following information provides the minimum separation distance for the highest gain antenna provided with the as
calculated from FCC OET Bulletin 65 Appendix A, T able (B) Limits for General Population / Uncontrolled Exposure. This
calculation is based on the highest EIRP possible from the system, considering maximum power and antenna gain, and
considering a 1.0mW/cm^2 uncontrolled exposure limit. The Friis formula used was:

S = (P * G ) / (4* π * r2)
Where
P = 5mW (Maximum peak output power)
G = 0.562 Numerical Antenna gain; equal -2.5 dBi
r = 20.0 cm
For: BT Module S = 0.0112 mW/cm2

Calculated Ratio for all transmitters:

0.00204 / 0.6 + 0.595 / 1 + 0.0112 / 1 = 0.609

The total radio for all transmitters under 15.247 is 0.60654 which is less than 1 therefore it is compliant.

Document Created: 2014-07-25 14:29:01
Document Modified: 2014-07-25 14:29:01

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