Maximum Permissible Exposure

/RF Exposure Info

SHANTOU WEIDA ELECTRONIC INDUSTRY CO., LTD EH45 2A49N-EH45 2A49NEH45 eh45

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FCC ID: 2A49N-EH45
RF exposure evaluation
According to§15.247(i), §1.1307 (b) and KDB447498, systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the commission's guidance.
The SAR-based exemption formula of §1.1307(b)(3)(i)(B), repeated here as Formula (B.2), applies for single fixed, mobile, and portable RF sources with available maximum time-averaged power or effective radiated power (ERP), whichever is greater, of less than or equal to the threshold Pth (mW).
This method shall only be used at separation distances from 0.5 cm to 40 cm and at frequencies from 0.3 GHz to 6 GHz (inclusive). Pth is given by Formula (B.2).

F is in GHz, d is the separation distance (cm), and ERP20cm is per Formula (B.1). When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. We use 5mm as separation distance to calculate

Antenna gain: -0.68 dBi Conducted Transmit Power Max: = 2.16dBm = 1.64mW
EIRP=2.16dBm-0.68dBi=1.48dBm ERP=1.48-2.15dB=-0.67dBm The maximun ERP power specified is -0.67dBm =0.86mW The source- based time-averaging conducted output power =0.86 * Duty factor mW (where Duty Factor1) = 0.86 mW

The SAR Exclusion Threshold Level:

th(mW) = ERP20cm * (/20cm)  (X=

)

= 2.72 mW Since the source-based time-averaging conducted output power is well below the SAR low threshold level, so the EUT is considered to comply with SAR requirement without testing.



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