RF exposure

FCC ID: LLP-NTJ2106

RF Exposure Info

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FCCID_852465

Report No. 078116R-RF-US-Exp RF Exposure Evaluation declaration Product Name ： Wireless Headphone USB Dongle Model No. ： PC-2400, TE2106E, UH7100 FCC ID. ： LLP-NTJ2106 Applicant : Nasaco Electronics (H.K) Ltd. Address : 11/F., Unit 6, Eastern Centre, 1065 King’s Road, Quarry Bay, Hong Kong Date of Receipt : 2007/08/03 Date of Declaration : 2007/08/21 Report No. : 078116R-RF-US-Exp The declaration results relate only to the samples calculated. The declaration shall not be reproduced except in full without the written approval of QuieTek Corporation. Page: 1 of 3 Version:1.0

Report No. 078116R-RF-US-Exp 1. RF Exposure Evaluation 1.1. Limits According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency (RF) radiation as specified in 1.1307(b) LIMITS FOR MAXIMUM PERMISSIBLE EXPOSURE (MPE) Frequency Range Electric Field Magnetic Field Power Density Average Time 2 (MHz) Strength (V/m) Strength (A/m) (mW/cm ) (Minutes) (A) Limits for Occupational/ Control Exposures 300-1500 -- -- F/300 6 1500-100,000 -- -- 5 6 (B) Limits for General Population/ Uncontrolled Exposures 300-1500 -- -- F/1500 6 1500-100,000 -- -- 1 30 F= Frequency in MHz Friis Formula Friis transmission formula: Pd = (Pout*G)/(4*pi*r2) Where Pd = power density in mW/cm2 Pout = output power to antenna in mW G = gain of antenna in linear scale Pi = 3.1416 R = distance between observation point and center of the radiator in cm Pd id the limit of MPE, 1 mW/cm2 . If we know the maximum gain of the antenna and the total power input to the antenna, through the calculation, we will know the distance r where the MPE limit is reached. 1.2. Test Procedure Software provided by client enabled the EUT to transmit and receive data at lowest, middle and highest channel individually. The temperature and related humidity: 18℃and 78％ RH. Page: 2 of 3 Version:1.0

Report No. 078116R-RF-US-Exp 1.3. Test Result of RF Exposure Evaluation Product Wireless Headphone USB Dongle Test Mode Mode 1: Transmit Test Condition RF Exposure Evaluation Antenna Gain Antenna Gain: The maximum Gain measured in fully anechoic chamber is 0dBi or 1 in linear scale. Output Power Into Antenna & RF Exposure Evaluation Distance: Channel Frequency Output Power to Antenna Power Density at R = 20 cm Channel (MHz) (mW) (mW/cm2) 1 2405.376 33.1894 0.00660 6 2436.096 32.7341 0.00651 11 2477.056 31.9890 0.00636 The power density Pd (4th column) at a distance of 20 cm calculated from the Friis transmission formula is far below the limit of 1 mW/cm2. Page: 3 of 3 Version:1.0


Document Created: 2007-10-04 16:15:01
Document Modified: 2007-10-04 16:15:01
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