S39 Bluetooth Earphone RF Exposure Info RF Exposure Shenzhen Hangshi Technology Co., Ltd

Shenzhen Hangshi Technology Co., Ltd Bluetooth Earphone

Page 1 of S39 Bluetooth Earphone RF Exposure Info RF Exposure Shenzhen Hangshi Technology Co., Ltd

RF Exposure evaluation
Product Description: Bluetooth Earphone
Model Number: S39
FCC ID: 2AKHJ-S39
According to 447498 D01 General RF Exposure Guidance v05 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
According to the follow transmitter output power(Pt)formula:
Pt=(E x d)2/(30 x gt)
Pt=transmitter output power in watts
gt=numeric gain of the transmitting antenna (unitess)
E=electric field strength in V/m
d=measurement distance in meters (m)
According to the formula described above:
Emax=99.53dBuv/m=0.095V/m, d=3m, gt=1.78
Pt=(E x d)2/(30 x gt)=(0.095x3)2 / (30x1.78)=0.001521W=1.52mW
The result is rounded to one decimal place for comparison
Worse case is as below: [2402MHz -1.52mW output power]
(1.52mW / 5mm)*[√2.402(GHz)] = 0.47 < 3.0 for 1 - g SAR
Then SAR evaluation is not required
NOTE: For the maximum power, you can refer FCC test report.
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Document ID3774045
Application ID6k6JxhpXlqc/123T9okLCA==
Document DescriptionRF Exposure
Short Term ConfidentialNo
Permanent ConfidentialNo
SupercedeNo
Document TypeRF Exposure Info
Display FormatAdobe Acrobat PDF - pdf
Filesize65.03kB (812915 bits)
Date Submitted2018-03-08 00:00:00
Date Available2018-03-08 00:00:00
Creation Date2018-02-06 19:03:17
Producing SoftwareMicrosoft® Office Word 2007
Document Lastmod2018-03-06 10:53:14
Document TitleRF Exposure
Document CreatorMicrosoft® Office Word 2007
Document Author: USER

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