MPE

FCC ID: NKR-VRWL25

RF Exposure Info

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FCCID_1381977

Report No.: FR0O1232-01 Appendix C. Maximum Permissible Exposure FCC ID: NKR-VRWL25 Page No. : 1 of 3

Report No.: FR0O1232-01 1. Maximum Permissible Exposure 1.1. Applicable Standard 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 limit for maximum permissible exposure. In accordance with 47 CFR FCC Part 2 Subpart J, section 2.1091 this device has been defined as a mobile device whereby a distance of 0.2 m normally can be maintained between the user and the device. (A) Limits for Occupational / Controlled Exposure Averaging Time Frequency Range Electric Field Magnetic Field Power Density (S) |E|²,|H|² or S (MHz) Strength (E) (V/m) Strength (H) (A/m) (mW/ cm²) (minutes) 0.3-3.0 614 1.63 (100)* 6 3.0-30 1842 / f 4.89 / f (900 / f)* 6 30-300 61.4 0.163 1.0 6 300-1500 F/300 6 1500-100,000 5 6 (B) Limits for General Population / Uncontrolled Exposure Averaging Time Frequency Range Electric Field Magnetic Field Power Density (S) |E|²,|H|² or S (MHz) Strength (E) (V/m) Strength (H) (A/m) (mW/ cm²) (minutes) 0.3-1.34 614 1.63 (100)* 30 1.34-30 824/f 2.19/f (180/f)* 30 30-300 27.5 0.073 0.2 30 300-1500 F/1500 30 1500-100,000 1.0 30 Note: f = frequency in MHz ; *Plane-wave equivalent power density 1.2. MPE Calculation Method E (V/m) ＝ 30 × P × G Power Density: Pd (W/m²) ＝ E2 d 377 E ＝ Electric field (V/m) P ＝ Peak RF output power (W) G ＝ EUT Antenna numeric gain (numeric) d ＝ Separation distance between radiator and human body (m) The formula can be changed to Pd ＝ 30 × P × G 377 × d 2 From the peak EUT RF output power, the minimum mobile separation distance, d=0.2m, as well as the gain of the used antenna, the RF power density can be obtained. FCC ID: NKR-VRWL25 Page No. : 2 of 3

Report No.: FR0O1232-01 1.3. Calculated Result and Limit Antenna Type : PIFA Antenna Max Conducted Power for IEEE 802.11g Ant. A: 24.75 dBm Peak Output Power Density Limit of Power Antenna Gain Antenna Gain Peak Output Power (S) Density (S) Test Result (dBi) (numeric) Power ( mW ) (dBm) (mW/cm²) (mW/cm²) 2.55 1.7989 24.7500 298.5383 0.106893 1 Complies FCC ID: NKR-VRWL25 Page No. : 3 of 3


Document Created: 2010-11-25 13:38:11
Document Modified: 2010-11-25 13:38:11
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