MPE calculation

FCC ID: N7NGOBI2

Test Report

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FCCID_1451500

MAXIMUM PERMISSIBLE EXPOSURE This Maximum Permissive Exposure (MPE) report demonstrates compliance for Gobi2000 Module with FCC CFR 47 §1.1310 and 2.1091 and IC Safety Code 6, Section 2.2.1 (a) for standalone and collocated simultaneous transmission in mobile exposure conditions. The MPE analysis is valid for transmitters operating within the parameters defined in Table B used for analysis. Any collocated transmitter must have a valid FCC ID documenting equivalent or degraded RF Output Power with the collocated parameters calculated in this MPE analysis. The mobile classification applies when 20 cm or more separation distance is maintained between the end user and both WLAN and Bluetooth transmission antennas. Portable user conditions or additional collocated modules not allowed based on this RF exposure analysis require a Class II permissive change and updated MPE or SAR report. FCC RULES §1.1310 The criteria listed in Table 1 shall be used to evaluate the environmental impact of human exposure to radio-frequency (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.

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IC RULES IC Safety Code 6, Section 2.2.1 (a) A person other than an RF and microwave exposed worker shall not be exposed to electromagnetic radiation in a frequency band listed in Column 1 of Table 5, if the field strength exceeds the value given in Column 2 or 3 of Table 5, when averaged spatially and over time, or if the power density exceeds the value given in Column 4 of Table 5, when averaged spatially and over time.

EQUATIONS Power density is given by: S = EIRP / (4 * Pi * D^2) where S = Power density in W/m^2 EIRP = Equivalent Isotropic Radiated Power in W D = Separation distance in m Power density in units of W/m^2 is converted to units of mWc/m^2 by dividing by 10. In the table(s) below, Power and Gain are entered in units of dBm and dBi respectively and conversions to linear forms are used for the calculations. LIMITS From FCC §1.1310 Table 1 (B), the maximum value of S = 0.549 mW/cm^2 @ 850MHz S = 1.0 mW/cm^2 @ 1900MHz, 2.4GHz / 5GHz From IC Safety Code 6, Section 2.2 Table 5 Column 4, S = 5.49 W/m^2 @ 850MHz S = 10 W/m^2 @ 1900MHz, 2.4GHz, 5GHz

1. Stand Alone Transmitter Calculation RESULTS Table A1: Gobi2000 Separation Output Antenna IC Power FCC Power Frequency Distance Power Gain Duty Cycle Density Density Technology (MHz) (%) (m) (dBm) (dBi) (W/m^2) (mW/cm^2) GPRS 850 (2 UL 824 0.20 33.00 7.0 25 4.98 0.498 Slots) WCDMA 850MHz 824 0.20 25.00 7.0 100 3.15 0.315 CDMA 850MHz 824 0.20 25.00 7.0 100 3.15 0.315 GPRS 1900 1850 0.20 29.50 3.5 25 0.99 0.099 (2 UL Slots) WCDMA 1900MHz 1850 0.20 25.00 3.5 100 1.41 0.141 CDMA 1900MHz 1850 0.20 25.00 3.5 100 1.41 0.141 Table A2: WLAN + Bluetooth Separation Output Antenna IC Power FCC P ower Technology Distance Power Gain Density Density (m) (dBm) (dBi) (W/m^2) (mW/cm^2) 2412 - 2462 0.20 25.00 6.0 2.51 0.251 5150 - 5250 0.20 20.00 6.0 0.79 0.079 5250 - 5350 0.20 20.00 6.0 0.79 0.079 5470 - 5725 0.20 20.00 6.0 0.79 0.079 5725 - 5850 0.20 25.00 6.0 2.51 0.251 2402 - 2480 0.20 13.00 5.0 0.13 0.013

2. Collocated MPE Calculations RESULTS Table B1: Gobi2000 (850MHz) + WLAN + Bluetooth Separation WLAN/BT WLAN/BT WWAN IC WWAN FCC IC WLAN + FCC WLAN + IC Power FCC Power Power Power Technology Distance BT+ WWAN BT + WWAN Density Density Density Density (m) (W/m ^2) (mW/cm^2) (W/m^2) (m W/cm^2) (W/m^2) (mW/cm^2) 2412 - 2462 0.20 2.51 0.251 4.980 0.498 7.62 0.762 5150 - 5250 0.20 0.79 0.079 4.980 0.498 5.90 0.590 5250 - 5350 0.20 0.79 0.079 4.980 0.498 5.90 0.590 5470 - 5725 0.20 0.79 0.079 4.980 0.498 5.90 0.590 5725 - 5850 0.20 2.51 0.251 4.980 0.498 7.62 0.762 Table B2: Gobi2000 (1900MHz) + WLAN + Bluetooth Separation WLAN IC WLAN FCC WWAN IC WWAN FCC IC WLAN + FCC WLAN + Power Power Power Power Technology Distance WWAN WWAN Density Density Density Density (m) (W/m^2) (mW/cm^2) (W/m^2) (m W/cm^2) (W/m^2) (mW/cm^2) 2412 - 2462 0.20 2.51 0.251 1.410 0.141 4.05 0.405 5150 - 5250 0.20 0.79 0.079 1.410 0.141 2.33 0.233 5250 - 5350 0.20 0.79 0.079 1.410 0.141 2.33 0.233 5470 - 5725 0.20 0.79 0.079 1.410 0.141 2.33 0.233 5725 - 5850 0.20 2.51 0.251 1.410 0.141 4.05 0.405 As shown in the calculations above, when all devices are operational, the worst case combination is within the limit at a distance of 20cm from the device.


Document Created: 2011-04-20 15:13:13
Document Modified: 2011-04-20 15:13:13
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