LEGO Systems 71646 R/C Toy Car Transmitter User Manual 826
LEGO Systems Inc R/C Toy Car Transmitter 826
8
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| Mirror Download [FCC.gov] | |
| Document ID | 826 |
| Application ID | yaDzjRKi7YGsJZaiIG4ruQ== |
| Document Description | 8 |
| Short Term Confidential | No |
| Permanent Confidential | No |
| Supercede | No |
| Document Type | User Manual |
| Display Format | Adobe Acrobat PDF - pdf |
| Filesize | 34.95kB (436827 bits) |
| Date Submitted | 1998-05-05 00:00:00 |
| Date Available | 1998-06-22 00:00:00 |
| Creation Date | 2001-07-17 12:50:08 |
| Producing Software | Acrobat Distiller 4.0 for Windows |
| Document Lastmod | 2001-07-17 12:50:10 |
| Document Title | 826.pdf |
| Document Author: | jsoscia |
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
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February 16, 1998
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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
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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).
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List of Figures
Figure 4, 1 Bandwidth ..................................................................................... 16
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EXHIBIT 1
GENERAL DESCRIPTION
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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.
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EXHIBIT 2
SYSTEM TEST CONFIGURATION
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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.
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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
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EXHIBIT 3
EMISSION RESULTS
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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.
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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
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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
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3.2 Radiated Emission Configuration Photograph
Worst Case Radiawed Emission
Front View
54.296 MHz
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3.2 Radiated Emission Configuration Photograph (cont)
Worst Case Radiated Emission
Rear View
54.296 MHz
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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
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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
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EXHIBIT 4
MISCELLANEOUS INFORMATION
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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.
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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
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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.
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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
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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.
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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.
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