RF Exposure

FCC ID: 2AHRH-FJ2500LA

RF Exposure Info

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FCCID_4380776

FCC ID: 2AHRH-FJ2500LA RF Exposure Evaluation FCC Limits The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency (RF) radiation as specified in 1.1307(b) Limits for Maximum Permissible Exposure (MPE) Electric field Frequency range Magnetic field strength Power density Averaging time strength 2 (MHz) (A/m) (mW/cm ) (minutes) (V/m) (A) Limits for Occupational/Controlled Exposures 0.3–3.0 614 1.63 *(100) 6 2 3.0–30 1842/f 4.89/f *(900/f ) 6 30–300 61.4 0.163 1.0 6 300–1500 f/300 6 1500–100,000 5 6 (B) Limits for General Population/Uncontrolled Exposure 0.3–1.34 614 1.63 *(100) 30 2 1.34–30 824/f 2.19/f *(180/f ) 30 30–300 27.5 0.073 0.2 30 300–1500 f/1500 30 1500–100,000 1.0 30 f = frequency in MHz Friis transmission formula: Pd = (Pout*G)/(4*pi*r2) Where Pd = power density in mW/cm2, Pout = output power to antenna in mW; G = gain of antenna in linear scale, Pi = 3.1416; R = distance between observation point and center of the radiator in cm Pd id the limit of MPE, 1 mW/cm2. If we know the maximum gain of the antenna and the total power input to the antenna, through the calculation, we will know the distance r where the MPE limit is reached. Test Procedure Software provided by client enabled the EUT to transmit and receive data at lowest, middle and highest channel individually.

FCC ID: 2AHRH-FJ2500LA Test Result of RF Exposure Evaluation WCDMA Band II Output power to Power Density at Limit Channel Result antenna (mW) R=20cm (mW/cm2) (mW/cm2) Lowest (1852.4MHz) 156.3148 0.03918 1.0 PASS Middle (1880.0MHz) 157.3983 0.03945 1.0 PASS Highest (1907.6MHz) 157.7611 0.03955 1.0 PASS Remark: antenna gain=1.0 dBi, Tune-up tolerance: 21±1 WCDMA Band V Output power to Power Density at Limit Channel 2 Result antenna (mW) R=20cm (mW/cm ) (mW/cm2) Lowest (826.4MHz) 187.0682 0.04689 0.551 PASS Middle (836.6MHz) 190.1078 0.04765 0.558 PASS Highest (846.6MHz) 198.6095 0.04979 0.564 PASS Remark: antenna gain=1.0 dBi, Tune-up tolerance: 22±1 LTE mode Power Frequency Output power to Output power Density at Limit Band (MHz) antenna (dBm) to antenna Result R=20cm (mW/cm2) (mW) (mW/cm2) LTE Band 2 1852.5 21.99 158.1248 0.03964 1.0 PASS LTE Band 4 1732.5 21.98 157.7611 0.03955 1.0 PASS LTE Band 5 825.5 22.00 158.4893 0.03973 0.550 PASS LTE Band 12 714.5 21.99 158.1248 0.03964 0.476 PASS LTE Band 13 779.5 21.98 157.7611 0.03955 0.520 PASS Remark: antenna gain=1.0 dBi Tune-up tolerance: 22±1

FCC ID: 2AHRH-FJ2500LA For BLE According to 447498 D01 General RF Exposure Guidance The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances > 50 mm are determined by: {[Power allowed at numeric threshold for 50 mm in step a)] + [(test separation distance – 50 mm)·10]} mW, for > 1500 MHz and ≤ 6 GHz eirp = pt x gt = (EXd)2/30 where: pt = transmitter output power in watts, gt = numeric gain of the transmitting antenna (unitless), E = electric field strength in V/m, --- 10((dBuV/m)/20)/106 d = measurement distance in meters (m) ---3m 2 So pt = (EXd) /30 x gt Field strength =89.63 dBuV/m @3m Ant gain =1.0dBi, so Ant numeric gain= 1.26 So pt={ [1089.63/20)/106 x 3]2/30x1.26}x1000 mW =0.219mW<96mW (illustrated in Appendix B)


Document Created: 2019-07-22 06:47:17
Document Modified: 2019-07-22 06:47:17
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