RF Exposure

FCC ID: W8D-F53

RF Exposure Info

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FCCID_4361147

RF EXPOSURE EVALUATION

1. PRODUCT INFORMATION

Product Description Car Bluetooth FM transmitter

Model Name F53

FCC ID W8D-F53

2. EVALUATION METHOD

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

3. 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)

BT Pt= -0.082dBm=0.98mW

The result for RF exposure evaluation
SAR=(0.98mW /5mm) .[√2.48(GHz)]= 0.31<3.0 for 1-g SAR

FM Pt=0.0000091mW
The result for RF exposure evaluation
SAR=(0.0000091mW /5mm) .[√0.1079(GHz)]= 0.00000060<3.0 for 1-g SAR

Simultaneous transmission between Bluetooth and FM transmitter
[(max. power of channel, including tune-up tolerance, mW) / (min. test separation
distance, mm)]·[√f(GHz)/x] W/kg, for test separation distances ≤ 50 mm;
where x = 7.5 for 1-g SAR and x = 18.75 for 10-g SAR.

SAR=(0.31+0.00000060)/7.5=0.041W/kg<1.6W/kg

4. CONCLUSION

The SAR evaluation is not required.

Document Created: 2019-07-18 09:21:24
Document Modified: 2019-07-18 09:21:24

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