Ar Intertwine 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 Infield, CT 06083 Manufacturer: Electron Developments Pte. Ltd. BLD.4008 Ang Mo Kio Avenue 10 Tech Place Singapore 569625, Singapore WO# 98010289 Tackle February 16, 1998 .
INTERTWINE TESTING SERVICES LIST OF EXHIBITS INTRODUCTION EXHIBIT I: General Description EXHIBIT 2: System Test Configuration EXHIBIT 3: Emission Results EXHIBIT 4: Miscellaneous Information WO# 98010289 FCC 1D: BLIMPISH Exhibit D p<
INTERTWINE 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 Results 3.1 Field Strength Calculation. 3.1 Field Strength Calculation (cont) 3.2 Radiated Emission Configuration Photograph 3.3 Radiated Emission Data.. 4.
INTERTWINE TESTING SERVICES List of Figures Figure 4.1 Band Width i ene eee 16 WO# 98010289 iti FLL ID diplopia Exhibit Dp.
INTERTWINE 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.
INTERTWINE TESTING SERVICES 2.0 System Test Configuration 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.
INTERTWINE 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 Intertwine 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: C.K.
INTERTWINE 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.
INTERTWINE TESTING SERVICES 31 Field Strength Calculation The field strength is calculated by adding the reading on the Spectrum Analyzer to the factors associated with amplifier (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.
INTERTWINE TESTING SERVICES 31 Field Strength Calculation {cont) Example Assume a receiver reading of 62.0 bedbug is obtained. The antenna factor of 7.4 dB and cable factor added. The amplifier gain 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 dBuV/m. This value in dBuV/m was converted to its corresponding level in Pvt. RA = 62.0 bedbug AF = 7.
INTERTWINE TESTING SERVICES 3.2 Radiated Emission Configuration Photograph Worst Case Radiated Emission Front View 54.
INTERTWINE TESTING SERVICES 3.2 Radiated Emission Configuration Photograph (cont) Worst Case Radiated Emission Rear View 54.296 MHz RADIOMAN Ait Ne.
INTERTWINE TESTING SERVICES 33 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. Judgment: Passed by 3.6 dB TEST PERSONNEL: Signature Ken C. C. Lam, Compliance Engineer Typed/Printed Name Feb .
INTERTWINE TESTING SERVICES Company: Lego Systems Inc. Date of Test: February 3, 1998 Model: 71646 Table 1 Radiated Emissions Polarity | Frequency | Reading | Antenna {| Pres Average Net Limit Margin {MHz) (Abut) | Factor Amp Factor (dB) (dB) Gain («IB) | (dBuV/m) | (dBuV/m) (dB) Vv 27.147 78.9 -1.8 16 5.5 55.6 80.0 -24.4 V 54.296 41.4 11 16 36.4 40.0 -3.6 v 81.442 33.2 7 16 24.2 40.0 -15.8 H *108.587 29.2 13 16 26.2 43.5 -17.3 H 190.027 29.3 16 16 —26.3 43.5 -14.2 H 217.174 29.8 17 16 30.8 46.0 -15.
INTERTWINE TESTING SERVICES 4.0 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. WO# 98010289 15 FCC 1D PLIMSOLL Exhibit Dp.
INTERTWINE 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 42.6 dB below the carrier level at the band edge (26.96 and 27.28 MHz). It meets the requirement of Section Figure 4.
INTERTWINE TESTING SERVICES 4.2 Discussion of Pulse Desensitization The determination of pulse sensitivity was made in accordance with Hewlett Packard Application Note 150-2, Spectrum Analysis Pulsed RF. Pulse sensitivity was not applicable for this device. The effective period 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 sensitivity factor was 0 dB.
INTERTWINE TESTING SERVICES 4.3 Calculation of Average Factor Averaging factor 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.
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44 INTERTWINE TESTING SERVICES Emissions Test Procedures The following is a description of the test procedure used by Intertwine 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.
INTERTWINE 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 C63.4 1992. The IF bandwidth used for measurement of radiated signal strength was 100 kHz or greater below 1000 MHz.