RF exposure evaluation

FCC ID: GPO112904

RF Exposure Info

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FCCID_3908000

Compliance Certification Services (Shenzhen) Inc. Report No: C180509Z02-RP1_MPE FCC ID: GPO112904 Date of Issue: June 26, 2018 MPE Report Exposure category: General population/uncontrolled environment EUT Type: Production Unit Device Type: Mobile Device Refer Standard: KDB 447498 D01 General RF Exposure Guidance v06 FCC Part 2 §2.1091 1. Evaluation method Systems operating under the provisions of FCC 47 CFR section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. In accordance with 47 CFR FCC Part 2 Subpart J, section 2.1091 this device has been defined as mobile device whereby a distance of 0.2m normally can be maintained between the user and the device, and below RF Permissible Exposure limit shall comply with. In accordance with KDB447498D01 for Simultaneous transmission MPE test exclusion applies when the sum of the MPE ratios for all simultaneous transmitting antennas incorporated in a host device, based on the calculated/estimated, numerically modeled or measured field strengths or power density, is ≤ 1.0. The MPE ratio of each antenna is determined at the minimum test separation distance required by the operating configurations and exposure conditions of the host device, according to the ratio of field strengths or power density to MPE limit, at the test frequency. Either the maximum peak or spatially averaged results from measurements or numerical simulations may be used to determine the MPE ratios. Spatial averaging does not apply when MPE is estimated using simple calculations based on far-field plane-wave equivalent conditions. The antenna installation and operating requirements for the host device must meet the minimum test separation distances required by all antennas, in both standalone and simultaneous transmission operations, to satisfy compliance. 2. Limits for General Population/Uncontrolled Exposure 3. Calculation Method Predication of MPE limit at a given distance Equation from page 18 of OET Bulletin 65, Edition 97-01 S=PG/4πR² Where: S=power density

Compliance Certification Services (Shenzhen) Inc. Report No: C180509Z02-RP1_MPE FCC ID: GPO112904 Date of Issue: June 26, 2018 P=power input to antenna G=power gain of the antenna in the direction of interest relative to an isotropic radiator R=distance to the center of radiation of the antenna From the EUT RF output power, the minimum mobile separation distance, d=0.2m, as well as the maximum gain of the used 0dBi for BT, the RF power density can be obtained. Antenna type and Operate frequency Maximum antenna Internal Identification antenna number band gain Antenna 0 Internal Antenna 2400 – 2500 MHz 0 dBi Antenna 1 Internal Antenna 2400 – 2500 MHz 0 dBi 4. Estimation Result 4.1 Conducted Power Results Bluetooth Peak Conducted Output Mode Channel Frequency(MHz) Power (dBm) 00 2402 -0.89 GFSK 39 2441 -0.92 78 2480 -1.53 00 2402 0.23 π/4DQPSK 39 2441 0.35 78 2480 -0.12 Frequency Field Strength of Fundamental Test Mode Channel (MHz) (dBuV/m) 1 2420 88.43 2.4GHz 2 2443 87.87 3 2465 88.28 4.2 Manufacturing tolerance Bluetooth GFSK Frequency (MHz) 2402 2441 2480 Maximum Output Power(dBm) -1.00 -1.00 -1.00 π/4DQPSK Frequency (MHz) 2402 2441 2480 Maximum Output Power(dBm) 0.00 0.00 -1.00

Compliance Certification Services (Shenzhen) Inc. Report No: C180509Z02-RP1_MPE FCC ID: GPO112904 Date of Issue: June 26, 2018 4.3 Measurement Results 4.3.1 Standalone MPE Antenna 0 Bluetooth Antenna Antenna Output power Duty MPE MPE Limits Mode Gain Gain Cycle (mW/cm2) (mW/cm2) (dBm) (mW) (dBi) (linear) GFSK 0 1.0000 0 1.0000 100% 0.0002 1.0000 π/4DQPSK 1.0000 1.2589 0 1.0000 100% 0.0003 1.0000 Remark: 1. Maximum power including tune-up tolerance; 2. MPE use distance is 20cm from manufacturer declaration of user manual. Antenna 1 According to KDB 412172 D01 Determining ERP and EIRP format; eirp = pt x gt = (E x d)2/30 Where: pt = transmitter output power in watts, gt = numeric gain of the transmitting antenna (unitless), E = electric field strength in V/m, d = measurement distance in meters (m). EIRP = 88.43 dBuV/m = 0.2607 mW = -5.84 dBm EIRP Output power Duty MPE MPE Limits Modulation Type dBm mW Cycle (mW/cm2) (mW/cm2) GFSK -5.84 0.2607 100% 0.0001 1.0000 4.3.2 Simultaneous Transmission MPE The sample support one BT modular and 2.4GHz modular, they supports difference antenna, need consider simultaneous transmission; Maximum Simultaneous transmission MPE Ratio for BT and 2.4GHz Maximum MPE Maximum MPE ∑MPE ratios Limit Results RatioBT Ratio2.4G 0.0003 0.0001 <0.1 1.0 PASS

Compliance Certification Services (Shenzhen) Inc. Report No: C180509Z02-RP1_MPE FCC ID: GPO112904 Date of Issue: June 26, 2018 Remark: 1. Output power including tune-up tolerance; 2. MPE evaluate distance is 20cm from user manual provide by manufacturer; 5. Conclusion The measurement results comply with the FCC Limit per 47 CFR 2.1091 for the uncontrolled RF Exposure of mobile device. ---------------- END OF REPORT---------------


Document Created: 2018-06-27 13:56:20
Document Modified: 2018-06-27 13:56:20
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