LEGO Systems 71646 R/C Toy Car Transmitter User Manual 826
LEGO Systems Inc R/C Toy Car Transmitter 826
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15mm - Intertek Testing Services/ ETL Testing Laboratories Lego Systems Inc. Emissions Testing Performed on the Transmitter Model: 71646 FCC ID: NPI71646 Applicant: LEGO Systems, Inc. 555 Taylor Road mfield, CT 06083 Manufacturer: Tectron Developments Pte.Ltd. BLDAOOB Ang Mo Kio Avenue 10 #O3—12/13 Tech Place Singapore 569625, Singapore W0}? 98010289 CKL/at February 16, 1998 ‘ m m. mum "Wm m m mpm sun "In mfly 10m: Simple mlnllly mm and mu um mm or on 4mm m «(a w hulk (mm which such 1 53mm: may a: nu! m haw: hm. ovum . Tm; upon shall not he mpwducad emwl m mu wmmm plmr amhnrlmmn 1mm 1mm 1mm; Sen/mu "mg Knng “We lntertek Testing Services Hong Kong Ltd. Z/F, Garment Comm, 576 lee Puk Road, Kowloon, Hong Kung. Telephone 1552; 2745 8500 Fax 1352} 2785 5457 (GD‘A'CSD. Exhiblr D pfil INTER’IEK TllSTING SERVICES— ~ LIST OF EXHIBITS ’ INIRODUCIION _ EXHIBIT 1 : General Description EXHIBIT 2: System Test Configmration - EXHIBIT 3: Emission Results EXHIBIT 4: Miscellaneous Information — Wear 98010289 F CL L0? bPl‘wIle. Edmbrr D (3:1 ________________________.._..—._—-—-—————————-——— INTERTEK TESTING SERVICES Table of Contents 1.0 General Description ..... 1.1 Product Description 1.2 Test Methodology 1.3 Test Facility ....... 2.0 System Test Configuration. 2.1 Justification ................ 2.2 EUT Exercising Software . 2.3 Special Accessories ....... 2.4 Equipment Modification . 2.5 Support Equipment List and Description... 3.0 Emission Rgglts .............. 3.1 Field Strength Calculation. 3.1 Field Strength Calculation (cont) ................. 3.2 Radiated Emission Configuration Photograph 3.3 Radiated Emission Data. 4.0 Miscellaneous lnformatign . 4‘1 Measured Bandwidth .. 4.2 Discussion of Pulse Desensitization. 4.3 Calculation of Average Factor ....... 4.4 Emissions Test Procedures ........... 4.4 Emissions Test Procedures (cont'd). WO# 98010289 Fu. 1m umiuu, " Eskiha‘r D P. 5 INTERTEK TESTING SERVICES List of Figures Figure 4, 1 Bandwidth ..................................................................................... 16 WO# 98010289 iii FLL Ib' UPL'Nb'Jb Emit)» D P- H INTERTEK TESTING SERVICES EXHIBIT 1 GENERAL DESCRIPTION WO# 98010289 Fat, 15‘ upxmwl. Em.“ i) p.S INTERTEK TESTING SERVICES 1.0 General Description 1 .1 Product Description The equipment under test (EUT) is a transmitter operating at 27.145 MHz and the transmitting frequency is controlled by a crystal. The transmitter is powered by a 9Vdc battery, The transmitter functions as a controller for a remote controlled toy car. There is two control panels. One control panel is used for control forward and backward motion. The other is used for control left and right motion. 1.2 Test Methodology The radiated emission measurements were performed according to the procedures in ANSI C634 (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. 1.3 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. WO# 98010289 Fable: Mann.“ Emma 53 pt INTERTEK TESTING SERVICES EXHIBIT 2 SYSTEM TEST CONFIGURATION WO}? 98010289 Flt ID: uinqt, 5mm 0 9.7 INTERTEK TESTING SERVICES 2.0 System Test Configgatinn 2,1 Justification The equipment under test (EUT) was configured for testing in a typical fashion (as a customer would normally use it). The EUT was mounted to a cardboard box, which enabled the engineer to maximize emissions through its placement in the three orthogonal axes. 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 worst case bit sequence was applied during test. The EUT was powered from a new, fully charged 9Vdc batteryi 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. WO# 98010289 F u. m: ppL’nwt. Ember—b p.‘d INTERTEK TESTING SERVICES 2.4 Equipment Modification Any modifications installed previous to testing by Logo Systems Inc. will be incorporated in each production model sold/leased in the United States. No modifications were installed by lntenek Testing Services. 25 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 : C. K. [Am Assistant Manager Intertek Testing Services ii ml 2 Q; Signature /6( ffélf‘fl'fi , {7&1} Date WO# 98010289 FCL ID' MP1'7M‘4L Emma D p.“- INTERTEK TESTING SERVICES EXHIBIT 3 EMISSION RESULTS WO# 98010289 Fcc m: UPtmwt. Exhibd’ D gun INTERTEK TESTING SERVICES 3.0 Emiggign 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. WO# 98010289 Fu. 1:0” wPwab Emma D F'” 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. FSzRA+AF+CF—AG+PD+AV where FS = Field Strength in dBHV/m RA = Receiver Amplitude (including preamplifier) in dBuV 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 WO# 98010289 FCLID. been...“ Emma P, u INTERTEK TESTING SERVICES 3.1 Field Strength Calculation (cont) Exa le Assume a receiver reading of 62.0 dBpV is obtained The antenna factor of 74 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 dBpV/m. This value in dBuV/m was convened to its corresponding level in pV/m. RA = 62.0 dpr AF = 7.4dB CF 2 1.6dB AG = 29.0dB PD = OdB AV = -10dB FS = 62 + 7.4 + 1.6 » 29 + O + (—10) z 32 dBuV/m Level in mV/m = Common Antilogarithm [(32 dBpLV/m)/20] : 39.8 ilV/m WO# 98010289 FU- Ib‘ MPI’tll-‘(L Eximbli’DP. 12> INTERTEK TESTING SERVICES 3.2 Radiated Emission Configuration Photograph Worst Case Radiawed Emission Front View 54.296 MHz uunxnn want, WOA’ 980 1 0289 10 F“. 10: 991mm. Ethan 0 33,11 INTERTEK TESTING SERVICES 3.2 Radiated Emission Configuration Photograph (cont) Worst Case Radiated Emission Rear View 54.296 MHz R\I)I \|| ll mum x.. 71 6 4 6 ?Qolc18‘i WO# 98010289 11 Fun)" taxman, Exkihu— D p. IS 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 3.6 dB TEST PERSONNEL: __fl7__ Signature Ken C. C. Lam, Compliance Engineer Typed/Primed Name Egg. [4 mg Dale WO# 980 1 0289 12 FCLID' mum-4b Elubat— D pl; INTERTEK TESTING SERVICES Company: Lego Systems Inc. Date of Test: February 3, 1998 Model: 71646 Table 1 Radiated Emissions Average Factor (dBuV/m) (dBuV/m) ———m-———— 81 442 ”08.587 190.027 217.174 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 IOOOMHz. *Emission within the restricted band meets the requirement of part 15.205. The corresponding limit as per 15209 is based on Quasi peak detector data for frequencies below 1000 MHz and average detector data for frequencies over 1000 MHz. Test Engineer: Ken C. C. Lam W011 980 1 0289 l 3 Fm. m1 mama Exhibit“ D P n INTERTEK TESTING SERVICES EXHIBIT 4 MISCELLANEOUS INFORMATION wo# 98010289 14 FLL ID? NPI'HL‘H. Emmw D 945 INTERTEK TESTING SERVICES 440 M'ggllaneous Information This miscellaneous information includes details of the measured bandwidth, the test procedure and calculation of factors such as pulse desensitization and averaging factor. W0)?l 98010289 15 FCL ID“. umunu. Emma D p, H INTERTEK TESTING SERVICES 8.1 Measured Bandwidth The plot on the following page shows the fundamental emission is confined in the specified band. And it also shows that the emissions are at least 426 dB below the carrier level at the band edge (26.96 and 27.28 MHz). It meets the requirement of Section 15.227(b), Figure 4.1 Bandwidth WO# 98010289 16 Ftcxo‘ ubxwwt. Etkin— D P' 10 ummE hm“ uzm NIZ m Zm>% NIx &.m 2m mmm NIx a.&mm Z\mu 3a 004 x 1mu e.nfi NIM s.mmd mxz H mmm awe Emma b 9. Al F LL ID‘, UPI’HUIL. waft‘lziowD-g‘l INTERTEK TESTING SERVICES 4.2 Discussion of Pulse Desensitization The determination of pulse desensitivity was made in accordance with Hewlett Packard Application Note 1504, Spectrum Analysis Pulsed RF, Pulse desensitivity was not applicable for this device. The effective period (Tm) was approximately 0.625ms for a digital "1" bit, as shown in the plots of Exhibit 4.3. With a resolution bandwidth (3 dB) of 100 kHz, the pulse desensitivity factor was 0 dB. WO# 98010289 17 FLLxD: oust-nu, Eakzbzi D 9.11 INTERTEK TESTING SERVICES 4.3 Calculation of Average Factor Averaging factor in dB = 20 log (duty cycle) The specification for output field strengths in accordance with the FCC rules specify measurements with an average detector. During testing, a spectrum analyzer incorporating a peak detector was used. Therefore, a reduction factor can be applied to the resultant peak signal level and compared to the limit for measurement instrumentation incorporating an average detector. The time period over which the duty cycle is measured is 100 milliseconds, or the repetition cycle, whichever is a shorter time frame. The worst case (highest percentage on) duty cycle is used for the calculation. The duty cycle is measured by placing the spectrum analyzer in zero scan (receiver mode) and linear mode at maximum bandwidm (3 MHz at 3 dB down) and viewing the resulting time domain signal output from the analyzer on a Tektronix oscilloscope. The oscilloscope is used because of its superior time base and triggering facilities. A plot of the worst-case duty cycle as detected in this manner are included in the following pages. The duty cycle is simply the on—time divided by the period: The duration of one cycle = 22.25ms Effective period of the cycle = 1.875 x 3 + 0.625 x 10 =11.88ms DC = 22.25ms/11.88ms = 0.53 or 53% Therefore, the averaging factor is found by 20 logm 0.53 or 53% z —5.5 dB WO)? 98010289 18 Fccxo- qu'nwt, Exkzhat B p43 umme ®.mm u3m% NI: m zm>w Nxz a.m 3m mmm% NI a z \mu afi wnj _x 1mu m.nafi mum aw Enfiu+b paq FCLID‘. uprmw. wo# 72010184 4,4 JNTERTEK TESTING SERVICES 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 atmched 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. W0)? 98010289 19 FCL Ib‘. unsung“, Emmi) 9115 INTERTEK TESTING SERVICES 4.4 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 C634 — 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 warmnt, 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 82). 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. WO# 98010289 20 FCL ID" tin-“gt“, Etkibw D pee 7 n zfimu 7 bgsanawausinfiuaia .* H . >n . g C : >s 963 $6 £3.58 q oflSnuEmam : in; A going : m m m m M 393 5; a u m o 8 :u m m m o m|_| x s L E: 9 u a | _ n.- ta 3 “l, s Q. . E: 85 EU 5 . mu as: {5:7— EE: ban. 355.323? , x . , 35... 222x333 , , , Scan? a EIEfiEE H win $3555 , min >mk§K¢u 7 363,32 «559.555 , Katmwzw ? 3523 5:5 } mumssz duos win zo_m_>mx mum fizmomzuxnmmwmiomn xuwwzmumz mE(z mat (in. vafihHmz "DH 99m u >wfi fizz fl E Z 50 as; as Us as a. \ zo . \l _ i s we a“ m6; , 'Exk;b:& D P~J7 EEfiE. N Es?- Edfiez Sex in wwwfihHmZ "QH UUh >2 m>0m< . 56 0.25.3 a uESoEbmd a 5: E: as. , vac/17, E: (I zfiwd bag; 35.3. 3.55 wag £5: "58. s a. 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