18_ST-Receiver01 RFExp

FCC ID: ZJEST

RF Exposure Info

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FCCID_2746757

RF Exposure evaluation

Product Description: 2.4GHz Receiver
Model Number: ST-Receiver01
FCC ID: ZJEST

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 above test data,
Emax=91.65dBuv/m=0.038V/m,d=3m,gt=1
Pt=(E x d)2/(30 x gt)=(0.038x3)2/(30x1)=0.000433W=0.4mW

The result is rounded to one decimal place for comparison
Worse case is as below: [2440MHz -0.4mW output power]
(0.4mW /5mm).[√2.44 (GHz)]= 0.12<3.0 for 1-g SAR
Then SAR evaluation is not required

NOTE: For the maximum power, you can refer FCC test report.

Document Created: 2015-09-08 14:30:40
Document Modified: 2015-09-08 14:30:40

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