RF Exposure

FCC ID: SK9M2LG1

RF Exposure Info

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FCCID_1397973

Model: M2 Gateway FCC ID: SK9M2LG1 IC: 864G-M2LG1

General Information:
Applicant: Itron Electricity Metering, Inc.
ACS Project: 10-0260
Device Category: Mobile
Environment: General Population/Uncontrolled Exposure
Simultaneous Transmission: Yes

Technical Information 900 MHz LAN Radio
Antenna Type: Quarter Wave Embedded Slot Antenna
Antenna Gain: 2.2dBi
Transmitter Conducted Power: 23.61dBm
Maximum System EIRP: 25.81dBm (381mW)

Technical Information 802.15.4 Zigbee Radio
Antenna Type: Quarter Wave Embedded Slot Antenna
Antenna Gain: 3.8dBi
Transmitter Conducted Power: 15.50dBm
Maximum System EIRP: 19.30dBm (85mW)

MPE Calculation
The Power Density (mW/cm2) is calculated as follows:

PG
S=
4R 2
Where:
S = power density (in appropriate units, e.g. mW/cm2)
P = power input to the antenna (in appropriate units, e.g., mW)
G = power gain of the antenna in the direction of interest relative to an isotropic radiator
R = distance to the center of radiation of the antenna (appropriate units, e.g., cm)

Transmit Radio Power Radio Antenna Antenna
Distance Power Density
Frequency Power Density Limit Power Gain Gain (mW
(cm) (mW/cm^2)
(MHz) (dBm) (mW/Cm2) (mW) (dBi) eq.)
902.25 23.61 0.60 229.61 2.2 1.660 20 0.076
2475 15.5 1.00 35.48 3.8 2.399 20 0.017

Summation of Power Densities – Simultaneous Transmissions
This device contains multiple transmitters which can operate simultaneously and therefore the maximum
RF exposure is determined by the summation of power densities. The 900 MHz LAN and 2.4GHz Zigbee
radio can operate simultaneously there it is appropriate to include both of those power density values in
the summation of power densities.

The maximum power density is calculated by a summation of power densities for each simultaneous
transmission combination as follows:

900MHz LAN: 0.076 (mW/cm^2)
2.4GHz Zigbee: 0.017 (mW/cm^2)
TOTAL: 0.093 (mW/cm^2)

Installation Guidelines
The installation manual should contain text similar to the following advising how to install the equipment to
maintain compliance with the FCC RF exposure requirements:

ACS Report: 10-0260 Advanced Compliance Solutions Page 2

Model: M2LG1 FCC ID: SK9M2LG1 IC: 864G-M2LG1

RF Exposure
In accordance with FCC requirements of human exposure to radio frequency fields, the radiating element
shall be installed such that a minimum separation distance of 20 centimeters will be maintained.

Conclusion
This device complies with the MPE requirements by providing adequate separation between the device,
any radiating structure and the general population.

5015 B.U. Bowman Drive Buford, GA 30518 USA Voice: 770-831-8048 Fax: 770-831-8598

Document Created: 2010-12-13 11:18:19
Document Modified: 2010-12-13 11:18:19

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