1904RSU006-U3 MPE Report

FCC ID: BRWTIARLGTNG1

RF Exposure Info

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FCCID_4302424

MRT Technology (Suzhou) Co., Ltd Report No.: 1904RSU006-U3 Phone: +86-512-66308358 Report Version: V01 Web: www.mrt-cert.com Issue Date: 05-16-2019 RF Exposure Evaluation Declaration FCC ID: BRWTIARLGTNG1 APPLICANT: Horizon Hobby, LLC Application Type: Certification Product: Receiver Model No.: AR637T Brand Name: Spektrum FCC Classification: Digital Transmission System (DTS) Test Procedure(s): KDB 447498 D01v06 Test Date: April 11 ~ April 26, 2019 Reviewed By: ( Sunny Sun ) Approved By: ( Robin Wu ) The test results relate only to the samples tested. The test results shown in the test report are traceable to the national/international standards through the calibration of the equipment and evaluated measurement uncertainty herein. The test report shall not be reproduced except in full without the written approval of MRT Technology (Suzhou) Co., Ltd. FCC ID: BRWTIARLGTNG1 Page Number: 1 of 7

Report No.: 1904RSU006-U3 Revision History Report No. Version Description Issue Date Note 1904RSU006-U3 Rev. 01 Initial Report 05-16-2019 Valid FCC ID: BRWTIARLGTNG1 Page Number: 2 of 7

Report No.: 1904RSU006-U3 §2.1033 General Information Applicant: Horizon Hobby, LLC Applicant Address: 2904 Research Rd. Champaign, IL 61822 Manufacturer: Horizon Hobby, LLC Manufacturer Address: 2904 Research Rd. Champaign, IL 61822 Test Site: MRT Technology (Suzhou) Co., Ltd Test Site Address: D8 Building, No.2 Tian’edang Rd., Wuzhong Economic Development Zone, Suzhou, China Test Device Serial No.: N/A Production Pre-Production Engineering Test Facility / Accreditations Measurements were performed at MRT Laboratory located in Tian’edang Rd., Suzhou, China.  MRT facility is a FCC registered (MRT Reg. No. 893164) test facility with the site description report on file and has met all the requirements specified in ANSI C63.4-2014.  MRT facility is an IC registered (MRT Reg. No. 11384A-1) test laboratory with the site description on file at Industry Canada.  MRT facility is a VCCI registered (R-20025, G-20034, C-20020, T-20020) test laboratory with the site description on file at VCCI Council.  MRT Lab is accredited to ISO 17025 by the American Association for Laboratory Accreditation (A2LA) under the American Association for Laboratory Accreditation Program (A2LA Cert. No. 3628.01) in EMC, Telecommunications, Radio and SAR testing. FCC ID: BRWTIARLGTNG1 Page Number: 3 of 7

Report No.: 1904RSU006-U3 1. PRODUCT INFORMATION 1.1. Feature of Equipment under Test Product Name: Receiver Model No.: AR637T Brand Name: Spektrum Frequency Range: 2402 ~ 2478 MHz Type of Modulation: GFSK Channel Number: 23 2TX & 2RX, SISO Mode Only Antenna Information: Dipole Antenna, 2dBi 1.2. Working Frequencies Channel Frequency Channel Frequency 01 2402 MHz 02 2405 MHz 03 2409 MHz 04 2412 MHz 05 2415 MHz 06 2418 MHz 07 2422 MHz 08 2425 MHz 09 2428 MHz 10 2431 MHz 11 2435 MHz 12 2438 MHz 13 2440 MHz 14 2444 MHz 15 2448 MHz 16 2451 MHz 17 2454 MHz 18 2457 MHz 19 2461 MHz 20 2464 MHz 21 2467 MHz 22 2471 MHz 23 2478 MHz --- --- Note: The engineer test sample was provided by the manufacturer, it was configured into fixed frequency TX status after power on. FCC ID: BRWTIARLGTNG1 Page Number: 4 of 7

Report No.: 1904RSU006-U3 2. RF Exposure Evaluation 2.1. 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 Calculation 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 is the limit of MPE, 1mW/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. FCC ID: BRWTIARLGTNG1 Page Number: 5 of 7

Report No.: 1904RSU006-U3 2.2. Test Result of RF Exposure Evaluation Product Receiver Test Item RF Exposure Evaluation Test Mode Frequency Band Maximum EIRP Power Density at Limit (MHz) (dBm) R = 20 cm (mW/cm2) (mW/cm2) GFSK 2402 ~ 2478 27.73 0.1180 1 Note: EIRP (dBm) = Conducted Power (dBm) + Peak Gain (dBi) CONCLUSION: The max Power Density at R (20 cm) = 0.1180mW/cm2 < 1 mW/cm2 for 2.4G Radio Frequency.. The End FCC ID: BRWTIARLGTNG1 Page Number: 6 of 7

Report No.: 1904RSU006-U3 Appendix A – EUT Photograph Refer to “1904RSU006-UE” file. FCC ID: BRWTIARLGTNG1 Page Number: 7 of 7


Document Created: 2019-05-31 21:43:16
Document Modified: 2019-05-31 21:43:16
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