MPE Calculations

FCC ID: OWS-NIC514

RF Exposure Info

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FCCID_1377725

Sheet1 Silver Spring Networks FCC ID: OWS-NIC514 902-928 MHz FHSS Radio Distance, cm Distance, cm Distance, cm Center meter Left Meter Right Meter 29 33.12 33.12 mW/cm2 from Table1: 0.60 0.6 0.6 Max RF Power TX Antenna MPE distance S, mW/cm Comment P, dBm G, dBi cm 29.86 4.00 18.0 0.230 Center Meter contribution 29.86 4.00 18.0 0.176 Left Meter contribution 29.86 4.00 18.0 0.176 Right meter contribution 16cm 16cm Worst Case RFx total 38.4% % center 900 MHz 29.4% % left 900 MHz 29.4% % right 900 MHz d cm 2 2 0.5 (d +16 ) TOTAL 97.2% <100% Basis of Calculations: MPE: S=0.6 mW/cm2 at d cm E^2/3770 = S, mW/cm2 E, V/m = (Pwatts*Ggain*30)^.5/d, meters d = ((Pwatts*G*30)/3770*S))^0.5 Pwatts*Ggain = 10^(PdBm-30+GdBi)/10) S@20cm = 20 log (MPE dist/20cm) NOTE: For mobile or fixed location transmitters, minimum separation distance is for FCC compliance is 20 cm, even if calculations indicate MPE distance is less Page 1


Document Created: 2010-11-06 21:11:21
Document Modified: 2010-11-06 21:11:21
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