WIZKR631Digital proportional radio control system

Kyosho Corporation of America 20322 Valencia Circle, Lake Forest, California, United States Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 To Whom It May Concern This letter is to comply with Sections 0.457 and 0.459 pertaining to confidential material. Kyosho Corporation of America would like the following documents regarding this submission for FCC ID: WIZKR631 to be kept confidential. 1. Schematics 2. Operational Description 3. Block Diagram The above material contains trade secrets or technical data, which would customarily be guarded from competitors. We do not want these documents to be accessible to the general public. Sincerely, Signature: Name: Futoshi Ishihara Company Name: Kyosho Corporation of America

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RF Exposure Evaluation Limits 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 (MHz) Electric field strength (V/m) Magnetic field strength (A/m) Power density (mW/cm 2 ) Averaging time (minutes) (A) Limits for Occupational/Controlled Exposures 0.3–3.0 614 1.63 *(100) 6 3.0–30 1842/f 4.89/f *(900/f 2 ) 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 0.3–1.34 614 1.63 *(100) 30 1.34–30 824/f 2.19/f *(180/f 2 ) 30 30–300 27.5 0.073 0.2 30 300–1500 f/1500 30 1500–100,000 1.0 30 f = frequency in MHz Friis transmission formula: Pd = (Pout*G)/(4*pi*r 2 ) Where Pd = power density in mW/cm 2 , 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/cm 2 . 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. Test Procedure Software provided by client enabled the EUT to transmit and receive data at lowest, middle and highest channel individually. Test Result of RF Exposure Evaluation Channel Output power to antenna (mW) Power Density at R=20cm (mW/cm 2 ) Limit (mW/cm 2 ) Result Lowest (2405.5MHz) 32.137 0.01013 1.0 PASS Middle (2440.0MHz) 41.115 0.01296 1.0 PASS Highest (2475.0MHz) 40.644 0.01282 1.0 PASS Remark: antenna gain=2.0 dBi

Global United Technology Services Co., Ltd. Report No.: GTSE14100180902 Authorized Signature: Robinson Lo Laboratory Manager This report details the results of the testing carried out on one sample. The results contained in this test report do not relate to other samples of the same product and does not permit the use of the GTS product certification mark. The manufacturer should ensure that all products in series production are in conformity with the product sample detailed in this report. This report may only be reproduced and distributed in full. If the product in this report is used in any configuration other than that detailed in the report, the manufacturer must ensure the new system complies with all relevant standards. Any mention of GTS or testing done by GTS in connection with, distribution or use of the product described in this report must be approved by GTS in writing. This document cannot be reproduced except in full, without prior written approval of the Company. Any unauthorized alteration, forgery or falsification of the content or appearance of this document is unlawful and offenders may be prosecuted to the fullest extent of the law. Unless otherwise stated the results shown in this test report refer only to the sample(s) tested and such sample(s) are retained for 90 days only. FCC Report Applicant: Kyosho Corporation of America Address of Applicant: 20322 Valencia Circle, Lake Forest, California, United States Equipment Under Test (EUT) Product Name: Digital proportional radio control system Model No.: KR631WT FCC ID: WIZKR631 Applicable standards: FCC CFR Title 47 Part 15 Subpart C Section 15.247:2013 Date of sample receipt: October 20, 2014 Date of Test: October 20-28, 2014 Date of report issued: October 28, 2014 Test Result : PASS * * In the configuration tested, the EUT complied with the standards specified above. Report No.: GTSE14100180902 Global United Technology Services Co., Ltd. Project No.: GTSE141001809RF 2nd Floor, Block No.2, Laodong Industrial Zone, Xixiang Road Baoan District, Shenzhen, China 518102 Telephone: +86 (0) 755 2779 8480 Fax: +86 (0) 755 2779 8960 Page 2 of 42 1 Version Version No. Date Description 00 October 28, 2014 Original Prepared By: Date: October 28, 2014 Project Engineer Check By: Date: October 28, 2014 Reviewer Report No.: GTSE14100180902 Global United Technology Services Co., Ltd. Project No.: GTSE141001809RF 2nd Floor, Block No.2, Laodong Industrial Zone, Xixiang Road Baoan District, Shenzhen, China 518102 Telephone: +86 (0) 755 2779 8480 Fax: +86 (0) 755 2779 8960 Page 3 of 42 2 Contents Page 1 VERSION ........................................................................................................................................................2 2 CONTENTS ....................................................................................................................................................3 3 TEST SUMMARY ...........................................................................................................................................4 4 GENERAL INFORMATION ............................................................................................................................5 4.1 CLIENT INFORMATION...............................................................................................................................5 4.2 GENERAL DESCRIPTION OF EUT ...............................................................................................................5 4.3 TEST MODE..............................................................................................................................................8 4.4 TEST FACILITY..........................................................................................................................................8 4.5 TEST LOCATION.......................................................................................................................................8 4.6 OTHER INFORMATION REQUESTED BY THE CUSTOMER...............................................................................8 4.7 DESCRIPTION OF SUPPORT UNITS.............................................................................................................8 4.8 TEST INSTRUMENTS LIST...........................................................................................................................9 5 TEST RESULTS AND MEASUREMENT DATA..........................................................................................10 5.1 ANTENNA REQUIREMENT.........................................................................................................................10 5.2 CONDUCTED PEAK OUTPUT POWER........................................................................................................11 5.3 20DB EMISSION BANDWIDTH..................................................................................................................13 5.4 CARRIER FREQUENCIES SEPARATION......................................................................................................15 5.5 HOPPING CHANNEL NUMBER..................................................................................................................17 5.6 DWELL TIME...........................................................................................................................................18 5.7 PSEUDORANDOM FREQUENCY HOPPING SEQUENCE................................................................................22 5.8 BAND EDGE...........................................................................................................................................23 5.8.1 Conducted Emission Method ...........................................................................................................23 5.8.2 Radiated Emission Method ..............................................................................................................25 5.9 SPURIOUS EMISSION.......…

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Radiated Emission