User Guide
UNII 1
§ 15.407(f) Maximum Permissible Exposure
Test Requirement(s): §15.407(f): U-NII devices are subject to the radio frequency radiation exposure
requirements specified in §1.1307(b), §2.1091 and §2.1093 of this chapter, as
appropriate. All equipment shall be considered to operate in a “general
population/uncontrolled” environment.
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 @ 5180 – 5240 MHz, 5745 – 5825 MHz and
2400 – 2483.5 MHz; Limit for Uncontrolled exposure: 1 mW/cm
2
or 10 W/m
2
Equation from page 18 of OET 65, Edition 97-01
S = PG / 4R
2
or R = √(PG / 4S)
where, S = Power Density (mW/cm
2
)
P = Power Input to antenna (mW)
G = Antenna Gain (numeric value)
R = Distance (cm)
Test Results:
FCC
Frequency
(MHz)
Con. Pwr.
(dBm)
Con. Pwr.
(mW)
Ant. Gain
(dBi)
Ant. Gain
numeric
Pwr.
Density
(mW/cm
2
)
Limit
(mW/cm
2
)
Margin
Distance
(cm)
Result
5240
28.6
724.44
6
3.98
0.577
1.0
-0.423
20
Pass
2437
23.4
218.78
3
1.99
0.07
1.0
-0.93
20
Pass
*There is no simultaneous transmission
The safe distance for SWX-U6MESH where Power Density is less than the MPE Limit listed above was
found to be 20 cm.