MPE Esitmate Based upon Budgeted External Antenna Gain

FCC ID: N7NAC402

RF Exposure Info

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FCCID_1085548

REPORT NO: 08U12312-3 DATE: FEBRUARY 09 2009 FCC ID: N7NAC402 IC: 2417C-AC402 9.3. MAXIMUM PERMISSIBLE EXPOSURE LIMITS §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. Page 41 of 50 COMPLIANCE CERTIFICATION SERVICES FORM NO: CCSUP4031B 47173 BENICIA STREET, FREMONT, CA 94538, USA TEL: (510) 771-1000 FAX: (510) 661-0888 This report shall not be reproduced except in full, without the written approval of CCS.

REPORT NO: 08U12312-3 DATE: FEBRUARY 09 2009 FCC ID: N7NAC402 IC: 2417C-AC402 CALCULATIONS Given E = √ (30 * P * G) / d and S = E ^ 2 / 3770 where E = Field Strength in Volts/meter P = Power in Watts G = Numeric antenna gain d = Distance in meters S = Power Density in milliwatts/square centimeter Combining equations and rearranging the terms to express the distance as a function of the remaining variables yields: d = √ ((30 * P * G) / (3770 * S)) Changing to units of Power to mW and Distance to cm, using: P (mW) = P (W) / 1000 and d (cm) =100 * d (m) yields d = 100 * √ ((30 * (P / 1000) * G) / (3770 * S)) d = 0.282 * √ (P * G / S) where d = distance in cm P = Power in mW G = Numeric antenna gain S = Power Density in mW/cm^2 Substituting the logarithmic form of power and gain using: P (mW) = 10 ^ (P (dBm) / 10) and G (numeric) = 10 ^ (G (dBi) / 10) yields d = 0.282 * 10 ^ ((P + G) / 20) / √ S Equation (1) where d = MPE distance in cm P = Power in dBm G = Antenna Gain in dBi S = Power Density Limit in mW/cm^2 Equation (1) and the measured peak power is used to calculate the MPE distance. Page 42 of 50 COMPLIANCE CERTIFICATION SERVICES FORM NO: CCSUP4031B 47173 BENICIA STREET, FREMONT, CA 94538, USA TEL: (510) 771-1000 FAX: (510) 661-0888 This report shall not be reproduced except in full, without the written approval of CCS.

REPORT NO: 08U12312-3 DATE: FEBRUARY 09 2009 FCC ID: N7NAC402 IC: 2417C-AC402 LIMITS From §1.1310 Table 1 (B), S = 0.549 mW/cm^2 for cellular band and 1.0 mW/cm^2 for PCS band. RESULTS Mode MPE Ave Output Antenna Power Distance Power Gain Density Limits (cm) (dBm) (dBi) (mW/cm^2) (mW/cm^2) 800MHz Celllar 20.0 23.80 5.20 0.158 0.549 1900 MHz PCS 20.0 23.60 3.75 0.108 1 NOTE: For mobile or fixed location transmitters, the minimum separation distance is 20 cm, even if calculations indicate that the MPE distance would be less. Page 43 of 50 COMPLIANCE CERTIFICATION SERVICES FORM NO: CCSUP4031B 47173 BENICIA STREET, FREMONT, CA 94538, USA TEL: (510) 771-1000 FAX: (510) 661-0888 This report shall not be reproduced except in full, without the written approval of CCS.


Document Created: 2009-03-25 17:53:25
Document Modified: 2009-03-25 17:53:25
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