RF exposure calculation

FCC ID: VYYDD1149

RF Exposure Info

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FCCID_3064503

Report Number: 68.910.16.018.01A RF exposure Estimation for DD1149 Introduction DD1149 (FCC ID: VYYDD1149) is a Transmitter operating at 433.925MHz. 1. Limit and Guidelines on Exposure to Electromagnetic Fields According to 4.3 General SAR test exclusion guidance of KDB 447498 RF Exposure, no SAR required if power is lower than the flowing threshold: 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 calculation25 • 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 is ≤ 50 mm and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm according to 5) in section 4.3 is applied to determine SAR test exclusion. 2. Calculation method [(max. power of` channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] ·[√f(GHz)] ≤ 3.0 Power of` channel = 75.33dBuV/m=0.01mW Distance = 5 mm f = 0.433925 GHz [0.01/5] * SQRT(0.433925) =0.0013 0.0013≤ 3.0 Therefore, excluded from SAR testing. TUV SUD China, Shenzhen Branch Reviewed by: Prepared By: Phoebe Hu/ EMC Project Manager Aaron Lai/EMC Project Engineer Date: 2016-06-27 Date: 2016-06-27 TÜV SÜD Certification and Testing (China) Co., Ltd. Shenzhen Branch Building 12&13, Zhiheng Wisdomland Business Park, Nantou Checkpoint Road 2, Nanshan District, Shenzhen City, 518052, P. R. China Tel. +86 755 8828 6998, Fax: +86 755 8828 5299


Document Created: 2016-07-07 15:56:17
Document Modified: 2016-07-07 15:56:17
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