MPE - DXX

FCC ID: 2AI6Y-GUARDIAN

RF Exposure Info

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FCCID_4129307

RF Exposure Requirements: §1.1307(b)(1) and §1.1307(b)(2): 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 levels in excess of the Commission’s
guidelines.

RF Radiation Exposure Limit: §1.1310: As specified in this section, the Maximum Permissible Exposure
(MPE) Limit shall be used to evaluate the environmental impact of human
exposure to radiofrequency (RF) radiation as specified in Sec. 1.1307(b), except
in the case of portable devices which shall be evaluated according to the
provisions of Sec. 2.1093 of this chapter.

MPE Limit: EUT’s operating frequencies @ 905-924.8; Limit for Uncontrolled
exposure: f/1500 mW/cm2 = 0.617 mW/cm2Equation from page 18 of OET 65, Edition
97-01

S = PG / 4R2 or R = √(PG / 4S)

where, S = Power Density (mW/cm2)
P = Power Input to antenna (mW)
G = Antenna Gain (numeric value)
R = Distance (cm)

Test Results:

Max Fundamental field strength: 88.08 dBuV/m @ 924.8 MHz
EIRP = P + G = E + 20Log(d) – 104.77
P = E – G + 20 Log (d) – 104.77
P = -8.15 dBm = 0.153 mW

FCC
Pwr.
Frequency Con. Pwr. Con. Pwr. Ant. Gain Ant. Gain Limit Distance
Density 2 Margin Result
(MHz) (dBm) (mW) (dBi) numeric (mW/cm ) (cm)
(mW/cm2)
924.8 -8.15 0.153 1 1.259 0.00004 0.617 0.61696 20 Pass

The safe distance where Power Density is less than the MPE Limit listed above was found to be 20 cm.

Document Created: 2018-12-06 09:36:37
Document Modified: 2018-12-06 09:36:37

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