MPE Calculation

FCC ID: QIPMC75

RF Exposure Info

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FCCID_515725

layers 4_SIE_O504_GSM Siemens AG Attn. Thorsten Liebig Information and Communication Mobile Wireless Modules Siemensdamm 50 13629 Berlin Germany Torsten Lohoff 31.01.2005 Phone +49 (0) 2102 749 306 Fax +49 (0) 2102 749 350 FCC ID QIPCT75 — predictions for Maximum Permissable Exposure Dear Mr. Liebig, please find our Maximum Permissable Exposure calculations for the GSM module MC75. Best Regards Torsten Lohoff 7 layers AG Aufsichtsratsvorsitzender « Registergericht « registered in: Borsigstrasse 11 Chairman of the Supervisory Board: Dusseldort, HRB 44096 40880 Ratingen, Germany Michael Abels USt—IdNr + VAT Nr: Phone: +49 (0) 2102 749 0 Vorstand + Board: DE 203159652 Fax: +49 (0) 2102 749 350 Dr. Hans—Jirgen Meckelburg www.7Layers.com René Schildknecht

layers Maximum Permissable Exposure (as specified in Table 1B of 47 CFR 1.1310 — Limits for Maximum Permissable Exposure (MPE), Limits for General Population/Uncontrolled Exposure) Frequency range (MHz) |_Power density (mW/cm2) 300 — 1,500 £/1500 1,500 — 100,000 1.0 Calculations 850 MHz band Maximum peak output power at antenna input terminal: 31.5 dBm (1.41 W) (see 7 layers test report 4_SIE_0504_GSM_FCCc — FCC ID QIPCT75) Prediction distance R: 20 cm Prediction frequency: 836,4 MHz MPE limit S: 0.5576 mW/cm2 Equation OET bulletin 65, page 18, edition 97—01: S = P*G / (4rR2) 5 power density p power input to the antenna G = power gain of the antenna in the direction of interest relative to an isotropic radiator R = distance to to the center of radiation of the antenna) Maximum allowable antenna gain: 2.98 dBi Prediction The maximum allowed MPE value of 0.5576 mW/cm2will be reached in a distance of 20 cm in case that an antenna with an antenna gain of 2,98 dBi would be used. This means that the power density levels in a distance of 20 cm are in accordance with the FCC regulations as long as the used antenna has a gain below 2,98 dBi.

#layers Calculations 1900 MHz band Maximum peak output power at antenna input terminal: 28.6 dBm (0,7244 W) (see 7 layers test report 4_SIE_0504_GSM_FCCa — FCC ID QIPCT75) Prediction distance R: 20 cm Prediction frequency: 1880 MHz MPE limit S: 1 mW/cm2 Equation OET bulletin 65, page 18, edition 97—01: S = P*G / (4rR2) S = power density P = power input to the antenna G = power gain of the antenna in the direction of interest relative to an isotropic radiator R = distance to to the center of radiation of the antenna) Maximum allowable antenna gain: 8.41 dBi Prediction The maximum allowed MPE value of 1 mW/cm2 will be reached in a distance of 20 cm in case that an antenna with an antenna gain of 8,41 dBi would be used. This means that the power density levels in a distance of 20 cm are in accordance with the FCC regulations as long as the used antenna has a gain below 8,41 dBi.


Document Created: 2005-01-31 17:50:24
Document Modified: 2005-01-31 17:50:24
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