Revised MPE Estimate

FCC ID: N7NWMP100

RF Exposure Info

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FCCID_1358651

Evaluation of RF Exposure for WMP150 Embedded SIM Wireless Modem as a Mobile Device In this application we seek modular approval to the WMP150 Embedded SIM wireless modem for use in mobile configuration. Based on the FCC OET Bulletin 65 Supplement C and 47 CFR §2.1091, we have concluded that the WMP150 Embedded SIM will comply with the FCC rules on RF exposure for mobile devices if the antenna gain does not exceed 6 dBi in cellular band and 3.5 dBi in PCS band. The following analysis will demonstrate such compliance. The analysis will be done in two US bands. Operation in cellular band (824 – 849 MHz) The peak conducted output power of WMP150 Embedded SIM in Cellular band is 32.28 dBm. Take the worst case as an example, in which an antenna with 6 dBi gain is used. The resulted power density at a distance of 20 cm can be deducted as follows: Power Density = EIRP*DutyCycle/(4πR2) = 0.334 mW/cm2 where DutyCycle is 0.25 for Class 10 GPRS operation (the worst case) and R is 20 cm. The MPE limit for General Population/Uncontrolled Exposure is shown in the FCC OET Bulletin 65 Supplement C and can be calculated as follows: MPE limit = 824/1500 = 0.55 mW/cm2 As we can see the resulted power density is below the MPE limit, therefore WMP150 Embedded SIM in Cellular band is compliant with the FCC rules on RF exposure. Operation in PCS band (1850 – 1910 MHz) The peak conducted output power of WMP150 Embedded SIM in PCS band is 29.48 dBm. Take the worst case as an example, in which an antenna with 3.5 dBi gain is used. The resulted ERP can be expressed as follows: ERP = 29.48 + 3.5 –2.15 = 30.83 dBm (1.21 W) < 3 W The FCC OET Bulletin 65 Supplement C states that mobile devices identified in 47 CFR §2.1091 that operate at frequencies above 1.5 GHz with an ERP of 3.0 watts or more are required to perform routine environmental evaluation for RF exposure prior to equipment authorization or use; otherwise, they are categorically excluded. As we can see this resulted ERP is below 3 W, therefore routine environmental evaluation for RF exposure prior to equipment authorization or use for WMP150 Embedded SIM in PCS band is categorically excluded.


Document Created: 2010-10-12 17:26:38
Document Modified: 2010-10-12 17:26:38
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