Test Report

FCC ID: OKP1936A

Test Report

Download: PDF
FCCID_130349

September 1, 2000 Wow Wee Int'l. Ltd. Suit 301C, Energy Plaza, 92 Granville Rd., T.S.T. East, Kowloon, Hong Kong. Dear Ben, Enclosed you will find your file copy of a Part 15 Certification (FCC ID: OKP 1936A). We have forwarded the original, along with your check for $940.00, to FCC. For your reference, FCC will normally take another 60-90 days for reviewing the report. Approval will then be granted when no query is sorted. Please contact me if you have any questions regarding the enclosed material. Sincerely, Wilbur Ng Assistant Manager Enclosure FCC ID : OKP 1936A

Wow Wee Int'l. Ltd. Application For Certification (FCC ID: OKP 1936A) Transmitter WO# 0008271 WN/at September 1, 2000 • The test results reported in this report shall refer only to the sample actually tested and shall not refer or be deemed to refer to bulk from which such a sample may be said to have been obtained. • This report shall not be reproduced except in full without prior authorization from Intertek Testing Services Hong Kong Limited FCC ID : OKP 1936A

INTERTEK TESTING SERVICES LIST OF EXHIBITS INTRODUCTION EXHIBIT 1: General Description EXHIBIT 2: System Test Configuration EXHIBIT 3: Emission Results EXHIBIT 4: Equipment Photographs EXHIBIT 5: Product Labelling EXHIBIT 6: Technical Specifications EXHIBIT 7: Instruction Manual EXHIBIT 8: Miscellaneous Information FCC ID: OKP 1936A i

INTERTEK TESTING SERVICES MEASUREMENT/TECHNICAL REPORT Wow Wee Int'l. Ltd. - MODEL: 1936 FCC ID: OKP 1936A September 1, 2000 This report concerns (check one:) Original Grant X Class II Change Equipment Type: Low Power Transmitter (example: computer, printer, modem, etc.) Deferred grant requested per 47 CFR 0.457(d)(1)(ii)? Yes No X If yes, defer until: date Company Name agrees to notify the Commission by: date of the intended date of announcement of the product so that the grant can be issued on that date. Transition Rules Request per 15.37? Yes No X If no, assumed Part 15, Subpart C for intentional radiator - the new 47 CFR [10-1-96 Edition] provision. Report prepared by: Wilbur Ng Intertek Testing Services 2/F., Garment Center, 576, Castle Peak Road, HONG KONG Phone: 852-2173-8502 Fax: 852-2742-9149 FCC ID: OKP 1936A ii

INTERTEK TESTING SERVICES Table of Contents 1.0 General Description ................................................................................................................ 2 1.1 Product Description............................................................................................................. 2 1.2 Related Submittal(s) Grants................................................................................................. 2 1.3 Test Methodology................................................................................................................ 3 1.4 Test Facility ......................................................................................................................... 3 2.0 System Test Configuration...................................................................................................... 5 2.1 Justification.......................................................................................................................... 5 2.2 EUT Exercising Software .................................................................................................... 5 2.3 Special Accessories ............................................................................................................. 5 2.4 Equipment Modification...................................................................................................... 6 2.5 Support Equipment List and Description ............................................................................ 6 3.0 Emission Results ...................................................................................................................... 8 3.1 Field Strength Calculation ................................................................................................... 9 3.1 Field Strength Calculation (cont’d) ................................................................................... 10 3.2 Radiated Emission Configuration Photograph .................................................................. 11 3.3 Radiated Emission Data .................................................................................................... 12 4.0 Equipment Photographs ....................................................................................................... 15 5.0 Product Labelling .................................................................................................................. 17 6.0 Technical Specifications........................................................................................................ 19 7.0 Instruction Manual................................................................................................................ 21 8.0 Miscellaneous Information ................................................................................................... 23 8.1 Measured Bandwidth......................................................................................................... 24 8.2 Emissions Test Procedures ................................................................................................ 25 8.2 Emissions Test Procedures (cont'd)................................................................................... 26 FCC ID: OKP 1936A iii

INTERTEK TESTING SERVICES List of attached file Exhibit type File Description filename Cover Letter Letter of Agency letter.pdf Test Report Test Report report.doc Operation Description Technical Description descrip.pdf Test Setup Photo Radiated Emission radiated1.jpg to radiated2.jpg Test Report Bandwidth Plot bw.pdf External Photo External Photo ophoto1.jpg, to ophoto2.jpg Internal Photo Internal Photo iphoto1.jpg to iphoto2.jpg Block Diagram Block Diagram block.pdf Schematics Circuit Diagram circuit.pdf ID Label/Location Label Artwork and Location label.pdf User Manual User Manual manual.pdf FCC ID: OKP 1936A iv

INTERTEK TESTING SERVICES EXHIBIT 1 GENERAL DESCRIPTION FCC ID: OKP 1936A 1

INTERTEK TESTING SERVICES 1.0 General Description 1.1 Product Description The equipment under test (EUT) is a transmitter for a Remote Controlled Toy Bike operating at 49.860 MHz which is controlled by a crystal. The EUT is powered by three 1.5V Batteries. There are five switch, ON/OFF, Left and Right, Acceleration, Engine Rev. and headlights. The brief circuit description is saved with filename: descri.pdf 1.2 Related Submittal(s) Grants This is a single application for certification of a transmitter. The receiver for this transmitter is authorized by Declaration of Conformity/Certification procedure. FCC ID: OKP 1936A 2

INTERTEK TESTING SERVICES 1.3 Test Methodology Both AC mains line-conducted and radiated emission measurements were performed according to the procedures in ANSI C63.4 (1992). All measurements were performed in Open Area Test Sites. Preliminary scans were performed in the Open Area Test Sites only to determine worst case modes. For each scan, the procedure for maximizing emissions in Appendices D and E were followed. All Radiated tests were performed at an antenna to EUT distance of 3 meters, unless stated otherwise in the "Justification Section" of this Application. 1.4 Test Facility The open area test site and conducted measurement facility used to collect the emission data is located at Garment Centre, 576 Castle Peak Road, Kowloon, Hong Kong. This test facility and site measurement data have been fully placed on file with the FCC. FCC ID: OKP 1936A 3

INTERTEK TESTING SERVICES EXHIBIT 2 SYSTEM TEST CONFIGURATION FCC ID: OKP 1936A 4

INTERTEK TESTING SERVICES 2.0 System Test Configuration 2.1 Justification The system was configured for testing in a typical fashion (as a customer would normally use it), and in the confines as outlined in ANSI C63.4 (1992.) The EUT was powered by three 1.5V Batteries. For maximizing emissions, the EUT was rotated through 360°, the antenna height was varied from 1 meter to 4 meters above the ground plane, and the antenna polarization was changed. This step by step procedure for maximizing emissions led to the data reported in Exhibit 3.0. The unit was operated standalone and placed in the center of the turntable. The equipment under test (EUT) was configured for testing in a typical fashion (as a customer would normally use it). The EUT was placed on a turn table, which enabled the engineer to maximize emissions through its placement in the three orthogonal axes. For simplicity of testing, the unit was wired to transmit continuously. 2.2 EUT Exercising Software There was no special software to exercise the device. Once the button is depressed, the unit transmits the typical signal. For simplicity of testing, the unit was wired to transmit continuously. 2.3 Special Accessories There are no special accessories necessary for compliance of this product. FCC ID: OKP 1936A 5

INTERTEK TESTING SERVICES 2.4 Equipment Modification Any modifications installed previous to testing by Wow Wee Int'l. Ltd. will be incorporated in each production model sold/leased in the United States. No modifications were installed by Intertek Testing Services. 2.5 Support Equipment List and Description This product was tested in a standalone configuration. All the items listed under section 2.0 of this report are Confirmed by: Wilbur Ng Assistant Manager Intertek Testing Services Agent for Wow Wee Int'l. Ltd. Signature September 2, 2000 Date FCC ID: OKP 1936A 6

INTERTEK TESTING SERVICES EXHIBIT 3 EMISSION RESULTS FCC ID: OKP 1936A 7

INTERTEK TESTING SERVICES 3.0 Emission Results Data is included worst case configuration (the configuration which resulted in the highest emission levels). A sample calculation, configuration photographs and data tables of the emissions are included. FCC ID: OKP 1936A 8

INTERTEK TESTING SERVICES 3.1 Field Strength Calculation The field strength is calculated by adding the reading on the Spectrum Analyzer to the factors associated with preamplifiers (if any), antennas, cables, pulse desensitization and average factors (when specified limit is in average and measurements are made with peak detectors). A sample calculation is included below. FS = RA + AF + CF - AG + PD + AV where FS = Field Strength in dBµV/m RA = Receiver Amplitude (including preamplifier) in dBµV CF = Cable Attenuation Factor in dB AF = Antenna Factor in dB AG = Amplifier Gain in dB PD = Pulse Desensitization in dB AV = Average Factor in -dB In the radiated emission table which follows, the reading shown on the data table may reflect the preamplifier gain. An example of the calculations, where the reading does not reflect the preamplifier gain, follows: FS = RA + AF + CF - AG + PD + AV FCC ID: OKP 1936A 9

INTERTEK TESTING SERVICES 3.1 Field Strength Calculation (cont’d) Example Assume a receiver reading of 62.0 dBµV is obtained. The antenna factor of 7.4 dB and cable factor of 1.6 dB is added. The amplifier gain of 29 dB is subtracted. The pulse desensitization factor of the spectrum analyzer was 0 dB, and the resultant average factor was -10 dB. The net field strength for comparison to the appropriate emission limit is 32 dBµV/m. This value in dBµV/m was converted to its corresponding level in µV/m. RA = 62.0 dBµV AF = 7.4 dB CF = 1.6 dB AG = 29.0 dB PD = 0 dB AV = -10 dB FS = 62 + 7.4 + 1.6 - 29 + 0 + (-10) = 32 dBµV/m Level in mV/m = Common Antilogarithm [(32 dBµV/m)/20] = 39.8 µV/m FCC ID: OKP 1936A 10

INTERTEK TESTING SERVICES 3.2 Radiated Emission Configuration Photograph Worst Case Radiated Emission 149.594 MHz For electronic filing, the worst case radiated emission configuration photograph is saved with filename: radiated1.jpg to radiated2.jpg FCC ID: OKP 1936A 11

INTERTEK TESTING SERVICES 3.3 Radiated Emission Data The data on the following page lists the significant emission frequencies, the limit and the margin of compliance. Numbers with a minus sign are below the limit. Judgement: Passed by 3.5 dB TEST PERSONNEL: Signature Anthony K. M. Chan, Compliance Engineer Typed/Printed Name September 2, 2000 Date FCC ID: OKP 1936A 12

INTERTEK TESTING SERVICES Company: Wow Wee Int'l. Ltd. Date of Test: August 1, 2000 Model: 1936 Table 1 Radiated Emissions Polarity Frequency Reading A ntenna Pre- N et Lim it M argin (M H z) (dBµV ) Factor Am p at3m at3m (dB) (dB) G ain (dBµV /m ) (dBµV /m ) (dB) H 49.861 65.7 11 16 60.7 80.0 -19.3 H 99.731 39.6 11 16 34.6 43.5 -8.9 H 149.594 43.0 13 16 40.0 43.5 -3.5 H 199.447 38.6 16 16 38.6 43.5 -4.9 H 249.319 29.6 20 16 33.6 46.0 -12.4 H 299.181 24.6 22 16 30.6 46.0 -15.4 Notes: 1. Peak Detector Data unless otherwise stated. 2. All measurements were made at 3 meter. Harmonic emissions not detected at the 3 meter distance were measured at 0.3 meter and an inverse proportional extrapolation was performed to compare the signal level to the 3 meter limit. No other harmonic emissions than those reported were detected at a test distance of 0.3 meter. 3. Negative value in the margin column shows emission below limit. 4. Horn antenna and average detector are used for the emission over 1000MHz. *Emission within the restricted band meets the requirement of part 15.205. The corresponding limit as per 15.209 is based on Quasi peak detector data for frequencies below 1000 MHz and average detector data for frequencies over 1000 MHz. Test Engineer: Anthony K. M. Chan FCC ID: OKP 1936A 13

INTERTEK TESTING SERVICES EXHIBIT 4 EQUIPMENT PHOTOGRAPHS FCC ID: OKP 1936A 14

INTERTEK TESTING SERVICES 4.0 Equipment Photographs For electronic filing, the photographs are saved with filename: ophoto1.jpg to ophoto2.jpg and iphoto1.jpg to iphoto2.jpg FCC ID: OKP 1936A 15

INTERTEK TESTING SERVICES EXHIBIT 5 PRODUCT LABELLING FCC ID: OKP 1936A 16

INTERTEK TESTING SERVICES 5.0 Product Labelling For electronic filing, the FCC ID label artwork and the label location are saved with filename: label.pdf FCC ID: OKP 1936A 17

INTERTEK TESTING SERVICES EXHIBIT 6 TECHNICAL SPECIFICATIONS FCC ID: OKP 1936A 18

INTERTEK TESTING SERVICES 6.0 Technical Specifications For electronic filing, the block diagram and schematics are saved with filename: block.pdf and circuit.pdf respectively. FCC ID: OKP 1936A 19

INTERTEK TESTING SERVICES EXHIBIT 7 INSTRUCTION MANUAL FCC ID: OKP 1936A 20

INTERTEK TESTING SERVICES 7.0 Instruction Manual For electronic filing, a preliminary copy of the Instruction Manual is saved with filename: manual.pdf This manual will be provided to the end-user with each unit sold/leased in the United States. FCC ID: OKP 1936A 21

INTERTEK TESTING SERVICES EXHIBIT 8 MISCELLANEOUS INFORMATION FCC ID: OKP 1936A 22

INTERTEK TESTING SERVICES 8.0 Miscellaneous Information This miscellaneous information includes details of the measured bandwidth, the test procedure and calculation of factors such as pulse desensitization and averaging factor. FCC ID: OKP 1936A 23

INTERTEK TESTING SERVICES 8.1 Measured Bandwidth The plot on saved in bw.pdf shows the fundamental emission is confined in the specified band. The field strength of any emission appearing between the band edges and up to 10kHz above and below the band deges (49.81 and 49.91 MHz) is at least 26 dB below the carrier level. It meets the requirement of Section 15.235(b). Figure 8.1 Bandwidth FCC ID: OKP 1936A 24

INTERTEK TESTING SERVICES 8.2 Emissions Test Procedures The following is a description of the test procedure used by Intertek Testing Services in the measurements of transmitters operating under Part 15, Subpart C rules. The test set-up and procedures described below are designed to meet the requirements of ANSI C63.4 - 1992. The transmitting equipment under test (EUT) is attached to a cardboard box and placed on a wooden turntable which is four feet in diameter and approximately one meter in height above the ground plane. During the radiated emissions test, the turntable is rotated and any cables leaving the EUT are manipulated to find the configuration resulting in maximum emissions. The cardboard box is adjusted through all three orthogonal axes to obtain maximum emission levels. The antenna height and polarization are varied during the testing to search for maximum signal levels. Detector function for radiated emissions is in peak mode. Average readings, when required, are taken by measuring the duty cycle of the equipment under test and subtracting the corresponding amount in dB from the measured peak readings. A detailed description for the calculation of the average factor can be found in Exhibit 8.3. The frequency range scanned is from the lowest radio frequency signal generated in the device which is greater than 9 kHz to the tenth harmonic of the highest fundamental frequency or 40 GHz, whichever is lower. For line conducted emissions, the range scanned is 450 kHz to 30 MHz. FCC ID: OKP 1936A 25

INTERTEK TESTING SERVICES 8.2 Emissions Test Procedures (cont'd) The EUT is warmed up for 15 minutes prior to the test. AC power to the unit is varied from 85% to 115% nominal and variation in the fundamental emission field strength is recorded. If battery powered, a new, fully charged battery is used. Conducted measurements are made as described in ANSI C63.4 - 1992. The IF bandwidth used for measurement of radiated signal strength was 100 kHz or greater below 1000 MHz. Where pulsed transmissions of short enough pulse duration warrant, a greater bandwidth is selected according to the recommendations of Hewlett Packard Application Note 150-2. A discussion of whether pulse desensitivity is applicable to this unit is included in this report (See Exhibit 8.2). Above 1000 MHz, a resolution bandwidth of 1 MHz is used. Transmitter measurements are normally conducted at a measurement distance of three meters. However, to assure low enough noise floor in the forbidden bands and above 1 GHz, signals are acquired at a distance of one meter or less. All measurements are extrapolated to three meters using inverse scaling, but those measurements taken at a closer distance are so marked. FCC ID: OKP 1936A 26


Document Created: 2000-12-27 07:41:56
Document Modified: 2000-12-27 07:41:56
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC