RF EXPOSURE

FCC ID: SK9AMI-2A

RF Exposure Info

Download: PDF

FCCID_871053

Model(s): CVSOR-A FCC ID: SK9AMI-2A IC: 864G-AMI2A

General Information:
Applicant: Itron Electricity Metering Inc.
ACS Project: 07-0458
FCC ID: SK9AMI-2A
Device Category: Mobile
Environment: General Population/Uncontrolled Exposure
Exposure Conditions: Greater than 20 centimeters
Simultaneous Tx: Yes

Technical Information:

2.4GHz Zigbee 2.4GHz Zigbee WiFi Module
Radio 900 MHz LAN FCC ID: RTTAB-WLNB
(Register PCB) (Cell Relay PCB) IC:5376A-ABWLNB
Antenna Type single-band patch half wavelength slot single-band slot Microstrip patch

Antenna Gain 3dBi 1dBi 4dBi 5dBi

Conducted
21.92dBm 18.71dBm -12.61dBm 15.66dBm
Power
Maximum EIRP 0.310W 0.094W 0.138mW 0.116W

Maximum ERP 0.189W 0.057W 0.084mW 0.071W

MPE Calculation:
Calculated Conducted Power (15.249) – Cell Relay 2.4GHz Zigbee Radio
For the purpose of determining Power Density for the 2.4GHz Zigbee radio on the Cell Relay PCB 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 87.86 H -1.24 86.62

Table 2: Peak Output Power
Frequency Numeric Gain Distance Max. Fund. Field Output Power
(MHz) (m) Strength (V/m) (dBm)
2405 2.51 3 0.0214 -12.61

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

Model(s): CVSOR-A FCC ID: SK9AMI-2A IC: 864G-AMI2A

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 Power
Distance
Frequency Power Density Limit Power Gain Gain Density
(cm)
(MHz) (dBm) (mW/Cm2) (mW) (dBi) (mW eq.) (mW/cm^2)
902.25 21.92 0.60 155.60 3 1.995 20 0.062
2405 18.71 1.00 74.30 1 1.259 20 0.019
2405 -12.61 1.00 0.05 4 2.512 20 0.000
2412 15.66 1.00 36.81 5 3.162 20 0.023

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 high power
Zigbee radio can not operate simultaneously there it is not appropriate to include both of those power
density values in the same summation of power densities. For the sake of providing the worst case data,
the highest power density from those two transmitters will be applied for the calculations.

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

900MHz LAN: 0.062 (mW/cm^2)
2.4GHz Zigbee: 0.000 (mW/cm^2)
802.11b: 0.023 (mW/cm^2)
TOTAL: 0.085 (mW/cm^2)

Installation Guidelines:
The installation manual shall contain text similar to the following 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: 2007-11-14 16:52:40
Document Modified: 2007-11-14 16:52:40

© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC