MPE Estimation

FCC ID: OWS-NIC502

RF Exposure Info

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FCCID_837946

MPE Calculation
for
FCC ID: OWS-NIC502
IC: 5975A-NIC502

Operating Environment:
The operating environment for the for the radio in all cases is a fixed, uncontrolled environment, however, the
devices are classified as being “Mobile”, Therefore the exposure at 20 cm is calculated.

Fixed, Uncontrolled Environment: (OET65/C Appdx A)
The FCC limit for the power density for uncontrolled exposure to RF devices operation at 900MHz at a distance of
20 cm is:
f (MHz)/1500 = 900/1500 = .6mW/cm2
Power density is calculated from the following equation

Exposure (mW/cm2) = EIRP(mW) * Duty Cycle
4*PI* Radius2(cm)

Where:
Radius = 20 cm
Duty Cycle = assumed to be 100% to yield a worst case result.
The maximum allowed external antenna gain on 900MHz is 3.0 dBi
The transmit power is 22.92 dBm, 195.884 mW

900MHz ISM band MPE distance Calculation
Using the EIRP measured on 900MHz ISM band.
MAX Pout: 22.92dBm (.195884 W) MAX Ant Gain 3.0 (1.995x)
EIRP: 25.92dBm (390.841 mW EIRP)

Calculating power density at a distance of 20 cm yields:
Power =
Density
390.841 * 1 390.841 .07775 mw/cm2
4 * Pi * 202 5026.548

Delta = specification - result
.6 mW/cm2 - .07775 mw/cm2 = .52225 mw/cm2
= -8.874 dB below limit

Document Created: 2007-09-03 06:56:33
Document Modified: 2007-09-03 06:56:33

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