RF exposure evaluation

FCC ID: BRWP68CEVAUR

RF Exposure Info

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FCCID_4194675

SAR Evaluation for extremity conditions 1. Extremity exposure conditions Devices that are designed or intended for use on extremities or mainly operated in extremity only exposure conditions; i.e., hands, wrists, feet and ankles, may require extremity SAR evaluation. When the device also operates in close proximity to the user’s body, SAR compliance for the body is also required. The 1-g body and 10-g extremity SAR Test Exclusion Thresholds should be applied to determine SAR test requirements. 2. Standalone SAR test exclusion considerations For FCC: 1) 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: [(max. power of channel, including tune-up tolerance, mW) / (min. test separation distance, mm)] · f (GHz ) ≤ 3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR, where  f (GHz) is the RF channel transmit frequency in GHz  Power and distance are rounded to the nearest mW and mm before calculation  The result is rounded to one decimal place for comparison  3.0 and 7.5 are referred to as the numeric thresholds in the step 2 below The test exclusions are applicable only when the minimum test separation distance ≤ 50 mm and for transmission frequencies between 100 MHz and 6 GHz 2) At 100 MHz to 6 GHz and for test separation distances > 50 mm, the SAR test exclusion threshold is determined according to the following, and as illustrated in Appendix B of KDB 447498  [Power allowed at numeric threshold for 50 mm in step 1) + (test separation distance - 50 mm)·(f(MHz)/150)] mW, at 100 MHz to 1500 MHz  [Power allowed at numeric threshold for 50 mm in step 1) + (test separation distance – 50 mm)·10] mW at > 1500 MHz and ≤ 6 GHz For IC: For limb-worn devices where the 10 gram value applies, the exemption limits for routine evaluation in Table 1 are multiplied by a factor of 2.5.

Note: Switch H/G/F/D/B/C ,Bind/Switch I are only used to set up Screen display, These buttons are not used when working normally, such as remote-controlled airplane. 3. UT Description (worst case) High-power transceiver ANT Distance of antenna to extremity exposure positions(mm) Top button 70 Note：Shortest distance between ANT to the position where the user operates

Low-power transceiver ANT Distance of antenna to extremity exposure positions(mm) Left side 15 Note：Shortest distance between ANT to the position where the user operates For FCC: Test separation distances ≤ 50 mm Conducted Power of EUT Tune-up Tune-up Test Frequency Power Power Limit power power distances Result (MHz) (dBm) (mW) (10-g SAR) (dBm) (mW) (mm) Low-power transceiver 2476.00 4.72 2.965 5.00 3.16 15.00 0.33 7.50 (3.16X√2.476)/15=0.33 Test separation distances > 50 mm Conducted Power of EUT Frequency Power Power Tune-up power Tune-up power Test distances Limit (MHz) (dBm) (mW) (dBm) (mW) (mm) (10-g SAR) High-power transceiver 2402-2478 27.10 512 27.50 562.34 70.00 740 296x2.5=740 For IC: Test separation distances ≤ 50 mm EIRP Power of EUT Frequency Power Antenna gain EIRP Power EIRP Power Test distances Limit (mW) (GHz) (dBm) (dBi) (dBm) (mW) (mm) (10-g SAR) Low-power transceiver 2476.00 4.72 2.00 6.72 4.70 15.00 37.50 Test separation distances > 50 mm Conducted Power of EUT Frequency Power Antenna Antenna gain EIRP Test distances Limit (mW) (MHz) (mW) gain (dBi) (dB ) Power(mW) (mm) (10-g SAR) High-power transceiver 2402-2478 512 1.5 1.4125 723.2 70.00 772.5 4. Conclusion SAR test for 10-g extremity is exclusion.


Document Created: 2019-03-08 10:28:09
Document Modified: 2019-03-08 10:28:09
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