RF EXPOSURE

FCC ID: SK9AMI-1

RF Exposure Info

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FCCID_712482

Model: CVSO, CVSOD, CVSOC Advanced Compliance Solutions FCC ID: SK9AMI-1

General Information:
Applicant: Itron Electricity Metering Inc.
ACS Project: 06-0239
FCC ID: SK9AMI-1
Device Category: Mobile
Environment: General Population/Uncontrolled Exposure
Exposure Conditions: Greater than 20 centimeters

Technical Information:

Radio 900 MHz LAN 2.4GHz Zigbee GPRS Modem Module
Antenna Type single-band patch single-band slot dual-band patch
GSM850: 0dBi
Antenna Gain 3dBi 4dBi
GSM1900: 3dBi
GSM850: 32.4dBm
Conducted Power 19.40dBm -3.0dBm
GSM1900: 29.8dBm
GSM850: 1.737W
Maximum EIRP 0.174W 0.001W
GSM1900: 1.9W

MPE Calculation:
Calculated Conducted Power (15.249) – 2.4GHz Zigbee Radio
For the purpose of determining Power Density for the 2.4GHz Zigbee radio the conducted RF
power must first be calculated.

The power was calculated using the following equation:

P = (E ∗ d )
2

30 ∗ G
Where: G = Numeric Gain of the transmitting antenna with reference to an isotropic radiator
d = The distance in meters from which the field strength was measured
E = The measured maximum fundamental field strength in V/m

Table 1: Maximum Fundamental Field Strength
Uncorrected Corrected
Frequency Antenna Total Correction
Reading Reading
(MHz) Polarity (H/V) Factor (dB)
(dBµV/m) (dBµV/m)
2405 96.36 V -0.12 96.24

Table 2: Peak Output Power
Frequency Numeric Gain Distance Max. Fund. Field Output Power
(MHz) (m) Strength (V/m) (dBm)
2405 2.52 3 0.06 -2.99

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

Model: CVSO, CVSOD, CVSOC Advanced Compliance Solutions FCC ID: SK9AMI-1

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

PG
S=
4πR 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)

MPE Calculator for Mobile Equipment
Limits for General Population/Uncontrolled Exposure*
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 21.36 0.60 136.77 3.5 2.239 20 0.061
2405 -3 1.00 0.50 4 2.512 20 0.000
824 32.4 0.55 1737.80 0 1.000 20 0.346
1850 30 1.00 1000.00 3 1.995 20 0.397

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 maximum
power density as calculated by a summation of power densities for each transmitter is as follows:

GPRS Modem Operating in the 800MHz Cellular Band:

900MHz LAN: 0.061 (mW/cm^2)
2.4GHz Zigbee: 0.000 (mW/cm^2)
GSM 850 (GPRS): 0.346 (mW/cm^2)
TOTAL: 0.407 (mW/cm^2)

GPRS Modem Operating in the 1900MHz PCS Band:

900MHz LAN: 0.061 (mW/cm^2)
2.4GHz Zigbee: 0.000 (mW/cm^2)
GSM 1900 (GPRS): 0.397 (mW/cm^2)
TOTAL: 0.458 (mW/cm^2)

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

“RF Exposure (Intentional Radiators Only)
In accordance with FCC requirements of human exposure to radiofrequency fields, the radiating element
shall be installed such that a minimum separation distance of 20cm is maintained from the general
population.”

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: 2006-09-27 14:50:25
Document Modified: 2006-09-27 14:50:25

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