RF exposure letter

FCC ID: 2ARY8-S-1701

RF Exposure Info

Download: PDF

FCCID_4199579

RF Exposure evaluation

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
 The result is rounded to one decimal place for comparison

eirp = pt x gt = (EXd)2/30
where:
pt = transmitter output power in watts,
gt = numeric gain of the transmitting antenna (unitless),
E = electric field strength in V/m, --- 10((dBuV/m)/20)/106
d = measurement distance in meters (m)---3m
Sopt = (EXd)2/30 x gt

Ant gain=0dBi ;so Ant numeric gain=1

Field strength = 78.74dBuV/m @3m
So Pt={ [10(78.74/20)/106 x3]2/30x1 }x1000 mW = 0.022 mW

So ( 0.022 mW/5mm)x √0.43392 GHz = 0.003 < 3

Then SAR evaluation is not required

Document Created: 2019-03-13 20:48:42
Document Modified: 2019-03-13 20:48:42

© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC