RF Exposure

FCC ID: YR8ES825

RF Exposure Info

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FCCID_4321205

Bay Area Compliance Laboratories Corp. (Kunshan) Report No.: RKSA190402001-00B FCC §1.1310 & §2.1091 –MAXIMUM PERMISSIBLE EXPOSURE (MPE) Applicable Standard According to subpart 15.247 (i) and subpart 1.1310, 2.1091 systems operating under the provisions of this section shall be operated in a manner that ensures the public is not exposed to RF energy level in excess of the communication guidelines. Limits for General Population/Uncontrolled Exposure Frequency Range Electric Field Magnetic Field Power Density Averaging Time (MHz) Strength (V/m) Strength (A/m) (mW/cm2) (minutes) 0.3-1.34 614 1.63 *(100) 30 1.34-30 824/f 2.19/f *(180/f²) 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; * = Plane-wave equivalent power density Calculated Formulary: Predication of MPE limit at a given distance S = PG/4πR² = power density (in appropriate units, e.g. mW/cm2); P = power input to the antenna (in appropriate units, e.g., mW); G = power gain of the antenna in the direction of interest relative to an isotropic radiator, the power gain factor, is normally numeric gain; R = distance to the center of radiation of the antenna (appropriate units, e.g., cm); For simultaneously transmit system, the calculated power density should comply with: FCC Part 15.247 Page 13 of 60

Bay Area Compliance Laboratories Corp. (Kunshan) Report No.: RKSA190402001-00B Calculated Data: Tune-up Evaluatio Frequency Antenna Gain Output Power MPE n MPE Mode Range Power Density Limit Distance ratio (MHz) (numeri (mW/cm2) (mW/cm2) (dBi) (dBm) (mW) (cm) c) Wi-Fi 5.00 3.16 12.00 15.85 20 0.0100 1.00 0.0100 802.11b Wi-Fi 5.00 3.16 15.00 31.62 20 0.0199 1.00 0.0199 802.11g 2412~2462 Wi-Fi 802.11n- 5.00 3.16 18.00 63.10 20 0.0397 1.00 0.0397 HT20 LTE Band 2 1850~1910 4.00 2.51 24.00 251.19 20 0.1255 1.00 0.1255 LTE Band 4 1710~1755 4.00 2.51 23.00 199.53 20 0.0997 1.00 0.0997 LTE Band 5 824~849 4.00 2.51 24.00 251.19 20 0.1255 0.55 0.2282 LTE Band 699~716 4.00 2.51 24.00 251.19 20 0.1255 0.47 0.2670 12 LTE Band 777~787 4.00 2.51 24.00 251.19 20 0.1255 0.52 0.2414 13 LTE Band 814~849 4.00 2.51 24.00 251.19 20 0.1255 0.55 0.2282 26 GPRS 850 824~849 4.00 2.51 27.50 562.36 20 0.2810 0.55 0.5109 GPRS 1900 1850~1910 4.00 2.51 26.50 446.68 20 0.2232 1.00 0.2232 Note: (1) The target output powers are all declared by the Manufacturer. (2) The LTE module FCC ID: XMR201707BG96. (3) For GPRS/EGPRS Mode, the time based average power is relevant, the difference in between depends on the duty cycle of the TDMA signal. Number of Time slot 1 2 3 4 Duty Cycle 1:8 1:4 1:2.66 1:2 Time based Ave. power compared to slotted Ave. power -9 dB -6 dB -4.25 dB -3 dB GPRS:Maximum target output power with 4 slots are 30.5dBm@ GPRS850 and 29.5dBm@GPRS1900, so the time based Ave. power compared to sloted Ave. power are 27.5 dBm@ GPRS850 and 26.5 dBm@GPRS1900 (4) Wi-Fi and GPRS can transmit simultaneously; the worst condition is 802.11n-HT20 of Wi-Fi and GPRS850 4 slot as below: =0.0397+0.5109=0.5506< 1.0 Result: The device meet FCC MPE at 20 cm distance. FCC Part 15.247 Page 14 of 60


Document Created: 2019-06-18 05:37:32
Document Modified: 2019-06-18 05:37:32
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