RF Exposure Info

FCC ID: 2ALS8-MJ1048

RF Exposure Info

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FCCID_4091508

Report No.: C180927R01 Page 1 of 3 RADIO FREQUENCY EXPOSURE LIMIT 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. See § 1.1307(b) of this chapter. EUT Specification EUT DDHBC03NEB WLAN: 2.412GHz ~ 2.462GHz WLAN: 5.15GHz ~ 5.25GHz WLAN: 5.25GHz ~ 5.35GHz Frequency band WLAN: 5.47GHz ~ 5.725GHz (Operating) WLAN: 5.725GHz ~ 5.85GHz Bluetooth: 2.402GHz ~ 2.480GHz Others Portable (<20cm separation) Device category Mobile (>20cm separation) Others Occupational/Controlled exposure (S = 5mW/cm2) Exposure classification General Population/Uncontrolled exposure (S=1mW/cm2) Single antenna Multiple antennas Antenna diversity Tx diversity Rx diversity Tx/Rx diversity Max. tune up BLE 4.1 2402-2480: -0.50 dBm AVG Output power Antenna gain (Max) Antenna gain:-1.26dBi (Numeric gain:0.748) MPE Evaluation* Evaluation applied SAR Evaluation N/A Remark: 1. The maximum tune up output power is -0.50dBm (0.8913mW) at 2402MHz (with 0.748 numeric antenna gain.) 2. DTS device is not subject to routine RF evaluation; MPE estimate is used to justify the compliance. 3. For mobile or fixed location transmitters, no SAR consideration applied. The maximum power density is 1.0 mW/cm2 even if the calculation indicates that the power density would be larger.

Report No.: C180927R01 Page 2 of 3 TEST RESULTS No non-compliance noted. Calculation 30 × P × G E2 Given E= & S= d 3770 Where E = Field strength in Volts / meter P = Power in Watts G = Numeric antenna gain d = Distance in meters S = Power density in milliwatts / square centimeter Combining equations and re-arranging the terms to express the distance as a function of the remaining variables yields: 30 × P × G S= 3770d 2 Changing to units of mW and cm, using: P (mW) = P (W) / 1000 and d (cm) = d(m) / 100 Yields 30 × (P / 1000 ) × G P×G S= = 0.0796 × Equation 1 3770 × (d / 100 ) 2 d2 Where d = Distance in cm P = Power in mW G = Numeric antenna gain S = Power density in mW / cm2 Maximum Permissible Exposure Substituting the MPE safe distance using d = 20 cm into Equation 1: Yields S = 0.000199 × P × G Where P = Power in mW G = Numeric antenna gain S = Power density in mW / cm2

Report No.: C180927R01 Page 3 of 3 For Bluetooth: Power Frequency Max. tune up Antenna Distance Limit Modulation Mode density band (MHz) power(dBm) gain (dBi) (cm) (mW/cm2) (mW/cm2) BLE4.1 2402-2480 -0.50 -1.26 20 0.0001 1 Note: Only Bluetooth can transmit,The formula of bluetooth calculated MPE is: CPD1 / LPD1 + CPD2 / LPD2 + ……etc. < 1 CPD = Calculation power density LPD = Limit of power density Bluetooth =0.0001mW/cm2 (For mobile or fixed location transmitters, the maximum power density is 1.0 mW/cm2 even if the calculation indicates that the power density would be larger.)


Document Created: 2019-03-22 02:27:56
Document Modified: 2019-03-22 02:27:56
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