RF EXPOSURE

FCC ID: SK9AMI-2

RF Exposure Info

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FCCID_726006

Model: CVSOR Advanced Compliance Solutions FCC ID: SK9AMI-2

General Information:
Applicant: Itron Electricity Metering Inc.
ACS Project: 06-0241
FCC ID: SK9AMI-2
Device Category: Mobile
Environment: General Population/Uncontrolled Exposure
Exposure Conditions: Greater than 20 centimeters

Purpose:

The Itron Electricity Metering Inc. model CVSOR was evaluated in a configuration with multiple
simultaneously transmitting radios. This configuration consisted of an Enfora L.P. GPRS modem module
GSM0108 integrated into the Itron electricity meter CVSOR. The Enfora L.P. GPRS modem module
GSM0108 was previously certified under FCC ID: MIVGSM0108, IC: 4160A-GSM0108.

Technical Information:
2.4GHz Zigbee 2.4GHz Zigbee GPRS Modem
Radio 900 MHz LAN
(Register Board) (Cell Relay Board) Module
single-band surface mount omni-
Antenna Type patch
single-band slot
directional
dual-band patch
GSM850: 0dBi
Antenna Gain 3dBi 4dBi 3dBi
GSM1900: 3dBi
Conducted GSM850: 32.4dBm
19.40dBm -6.7dBm -12.99dBm
Power GSM1900: 29.8dBm
GSM850: 1.738W
Max. EIRP 0.174W 0.0005W 0.0001W
GSM1900: 1.905W
GSM850: 1.059W
Max. ERP 0.106W 0.0003W 0.00006W
GSM1900: 1.161W

MPE Calculation:
Calculated Conducted Power (15.249)
For the purpose of determining Power Density for the 2.4GHz Zigbee radios, 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

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

Model: CVSOR Advanced Compliance Solutions FCC ID: SK9AMI-2

Table 1: Maximum Fundamental Field Strength – 2.4GHz Zigbee Radio Register Board
Uncorrected Corrected
Frequency Antenna Total Correction
Reading Reading
(MHz) Polarity (H/V) Factor (dB)
(dBµV/m) (dBµV/m)
2480 91.96 H 0.53 92.49

Table 2: Peak Output Power– 2.4GHz Zigbee Radio Register Board
Frequency Numeric Gain Distance Max. Fund. Field Output Power
(MHz) (m) Strength (V/m) (dBm)
2480 2.51 3 0.04 -6.7

Table 3: Maximum Fundamental Field Strength – 2.4GHz Zigbee Radio Cell Relay Board
Uncorrected Corrected
Frequency Antenna Total Correction
Reading Reading
(MHz) Polarity (H/V) Factor (dB)
(dBµV/m) (dBµV/m)
2480 84.71 H 0.53 85.24

Table 4: Peak Output Power– 2.4GHz Zigbee Radio Cell Relay Board
Frequency Numeric Gain Distance Max. Fund. Field Output Power
(MHz) (m) Strength (V/m) (dBm)
2480 2.00 3 0.02 -12.99

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 19.4 0.60 87.10 3 1.995 20 0.035
2480 -6.7 1.00 0.21 4 2.512 20 0.000
2480 -12.99 1.00 0.05 3 1.995 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

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

Model: CVSOR Advanced Compliance Solutions FCC ID: SK9AMI-2

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: 0.035 (mW/cm^2)
2.4GHz Zigbee: 0.000 (mW/cm^2) *Includes both 2.4GHz Radios
GSM 850 (GPRS): 0.346 (mW/cm^2)
TOTAL: 0.381 (mW/cm^2)

GPRS Modem Operating in the 1900MHz PCS Band:

900MHz LAN: 0.035 (mW/cm^2)
2.4GHz Zigbee: 0.000 (mW/cm^2) *Includes both 2.4GHz Radios
GSM 1900 (GPRS): 0.397 (mW/cm^2)
TOTAL: 0.432 (mW/cm^2)

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

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: 2006-11-03 10:36:10
Document Modified: 2006-11-03 10:36:10

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