MPE

FCC ID: NF3-LRR3SCU

RF Exposure Info

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FCCID_1084801

CETECOM ICT Services GmbH Test report No.: 5-6075-1-6/08-A Date : 2009-03-23 Page 14 of 63 In the frequency range 40 to 240 GHz, spurious frequencies are measured as power densities. The EUT is operating with FMCW-modulation. The RBW and VBW are set to such a value that spurious power levels are clearly readable above the fundamental noise level of spectrum analyzer. The measurement distance is chosen to 0.125 m for detecting spurious emission signals. 5. Measurements of maximum safe level for radiated power density According to FCC § 1.1307, § 1.1310, § 2.1091 and § 2.1093 measurements are carried out in order to evaluate the impact of human exposure to RF radiation. For this test the EUT is in normal operation mode: FMCW. The measurement is performed at 6 different distances: 4 m, 2 m, 1 m, 0.5 m, 0.25 m, and 0.125 m. The measurements are applicable only for far field conditions. The near field area extends to a distance of R (meters) and can be calculated from the following equation: R<2∗L2/λ with R = distance in meters, L = largest dimension of either measuring horn or transmitting EUT antenna (L ≈ 0.07 m), and λ = wavelength in meters. In case of 76.5 GHz (λ = 0.0039 m), the far field theoretically starts at R = 2.5 m. However, it was shown by variation the test distance that measurements in a distance of 2.0 m provide accurate results. The maximum peak power density PD in r = 3 m distance is determined as 1.16 µW/cm2. Peak Power (EIRP) EIRP = PD ∗ 4π ∗ r2 = PD ∗1130973.4 cm2 EIRP = 1.32 W (see plot 1) Limit of maximum ERP (EIRP) for frequencies above 1.5 GHz is 3 W (4.9W). See FCC § 2.1091 (eirp = erp + 2.15 dB, EIRP = ERP x 1.64). RF Exposure for mobile conditions at r = 20 cm distance from EUT PD = EIRP / (4π ∗ r2 ) PD = 0.26 mW/cm² = 2.6 W/m² Limit of maximum permissible exposure (MPE) for uncontrolled environment:1.0 mW/cm². See FCC § 1.1310.


Document Created: 2009-03-24 08:42:24
Document Modified: 2009-03-24 08:42:24
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