MPE

FCC ID: G95TCA203

RF Exposure Info

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FCCID_1970559

731 Enterprise Drive Lexington, KY 40510 Telephone: 859-226-1000 Facsimile: 859-226-1040 www.intertek-etlsemko.com MPE Calculation § 1.1310: The criteria listed in table 1 shall be used to evaluate the environmental impact of human exposure to radiofrequency (RF) radiation as specified in §1.1307(b), except in the case of portable devices which shall be evaluated according to the provisions of §2.1093 of this chapter. Part 1.1310 Limits for Maximum Permissible Exposure (MPE) 1.1 Test Procedure An MPE evaluation for was performed in order to show that the device was compliant with §2.1091. The maximum power density was calculated for each transmitter at a separation distance of 20cm. For each transmitter the maximum RF exposure at a 20 cm distance using the formula: Conducted PowermW = 10ConductedPower ( dBm ) /10 Conducted PowermW × Ant.Gain PowerDensity = 4π × (20cm ) 2

731 Enterprise Drive Lexington, KY 40510 Telephone: 859-226-1000 Facsimile: 859-226-1040 www.intertek-etlsemko.com 1.2 Results: The device contains Cellular, Zigbee, and 802.11 transmitters which can transmit simultaneously. The following calculations show that the total power density from each transmitter at 20cm is less than the limit for general population / un-controlled exposure. With the worst case Cellular, 802.11, and Zigbee modules transmitting simultaneously, the MPE calculations are less than the applicable limit. The device meets the RF exposure limit at a 20cm separation distance as 1 required by part 2.1091 of the FCC rules with all modules transmitting simultaneously . The total sum of the ratio of the power densities to the corresponding limit for all radios capable of transmitting simultaneously was computed as follows: Total = (GSM850 Power Density / Limit GSM850) + (802.11 Power Density / Limit 802.11) + (Zigbee Power Density / Limit Zigbee) Total = 0.77 + 0.02 + 0.03 = 0.82 Compliance is shown by the sum of the radio of the power densities for all radios that can transmit simultaneously being less than 1. 1 The cellular radio is only capable of transmitting in one mode at a time.

731 Enterprise Drive Lexington, KY 40510 Telephone: 859-226-1000 Facsimile: 859-226-1040 www.intertek-etlsemko.com Individual Radio Test Results: GSM 850 Band Transmitter: Frequency 824.2 MHz Limit 0.549 mW/cm^2 Distance 20 cm Maximum Scaled Power 35 dBm TX Ant Gain 4.28 dBi EIRP 39.28 8472.274 mW Source Based Duty Cycle (2/8 Timeslots) 0.25 Source Based Output Power 2118.06854 mW Power Density 0.4214 mW/cm^2 at 20cm MPE / Limit Ratio 0.77 GSM 1900 Band Transmitter: Frequency 1850.2 MHz Limit 1.000 mW/cm^2 Distance 20 cm Maximum Scaled Power 32 dBm TX Ant Gain 3 dBi EIRP 35 3162.278 mW Source Based Duty Cycle (2/8 Timeslots) 0.25 Source Based Output Power 790.569415 mW Power Density 0.1573 mW/cm^2 at 20cm MPE / Limit Ratio 0.16

731 Enterprise Drive Lexington, KY 40510 Telephone: 859-226-1000 Facsimile: 859-226-1040 www.intertek-etlsemko.com WCDMA Band V Transmitter: Frequency 826.4 MHz Limit 0.551 mW/cm^2 Distance 20 cm Maximum Scaled Power 25 dBm TX Ant Gain 4.28 dBi EIRP 29.28 847.2274 mW Power Density 0.1686 mW/cm^2 at 20cm MPE / Limit Ratio 0.31 WCDMA Band II Transmitter Frequency 1852.4 MHz Limit 1.000 mW/cm^2 Distance 20 cm Maximum Scaled Power 25 dBm TX Ant Gain 3 dBi EIRP 28 630.9573 mW Power Density 0.1255 mW/cm^2 at 20cm MPE / Limit Ratio 0.13

731 Enterprise Drive Lexington, KY 40510 Telephone: 859-226-1000 Facsimile: 859-226-1040 www.intertek-etlsemko.com 802.11 Frequency 2412 MHz Limit 1.000 mW/cm^2 Distance 20 cm Power 17.74 dBm TX Ant Gain 2.04 dBi EIRP 19.78 95.06048 mW Power Density 0.0189 mW/cm^2 at 20cm MPE / Limit Ratio 0.02 Zigbee Transmitter Frequency 2450 MHz Limit 1.000 mW/cm^2 Distance 20 cm Power 18.87 dBm TX Ant Gain 2.41 dBi EIRP 21.28 134.2765 mW Power Density 0.0267 mW/cm^2 at 20cm MPE / Limit Ratio 0.03


Document Created: 2013-05-20 18:17:04
Document Modified: 2013-05-20 18:17:04
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