AUXO 15598 Big Wheels Instructions

AUXO 15598 Big Wheels

AUXO INTERNATIONAL LTD
Application For Certification
FCC ID: SFF-15598
Product Name: Big Wheels
Additional Name： Formula Racer
Model: 15598/16196
Transmitter
Report No.: SZHH01957054-001

We hereby certify that the sample of the above item is considered to comply with the requirements of FCC Part 15, Subpart C for Intentional Radiator, mentioned 47 CFR [10-1-23] Prepared and Checked by: Approved by:
Sign on file
Maura Wang
Engineer

• The test results reported in this test report shall refer only to the sample 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 is for the exclusive use of Intertek’s Client and is provided under the agreement between Intertek and its Client. Intertek’s responsibility and liability are limited to the terms and conditions of the agreement. Intertek assumes no liability to any party, other than to the Client by the agreement, for any loss, expense, or damage occasioned by the use of this report. Only the Client is authorized to copy or distribute this report. Any use of the Intertek name or one of its marks for the sale or advertisement of the tested material, product, or service must first be approved in writing by Intertek. The observations and test results referenced from this report are relevant only to the sample tested. This report by itself does not imply that the material, product, or service is or has ever been under an Intertek certification program.
• The terms And Conditions of the services can be provided upon request.
• The evaluation data of the report will be kept for 3 years from the date of issuance.

GENERAL INFORMATION

AUXO INTERNATIONAL LTD
MODEL: 15598/16196
FCC ID: SFF-15598

Tong, Hong Kong.
Contact Person:| Edward Chan
Tel:| (852)3168 6631
Manufacturer:| AUXO INTERNATIONAL LTD
Manufacturer Address:| Rm 1425, Block A, Hoi Luen Ind. Ctr., 55 Hoi Yuen Rd., Kwun Tong, Hong Kong.
Model:| 15598/16196
Type of EUT:| Transmitter
Description of EUT:| Big Wheels
Serial Number:| N/A
FCC ID :| SFF-15598
Date of Sample Submitted:| July 24, 2024
Date of Test:| August 03, 2024
Report No.:| SZHH01957054-001
Report Date:| August 08, 2024
Environmental Conditions:| Temperature: +10 to 40°C Humidity: 10 to 90%

SUMMARY OF TEST RESULT
AUXO INTERNATIONAL LTD
MODEL: 15598/16196
FCC ID: SFF-15598

N/A
Transmitter Field Strength and Bandwidth Requirement| 15.249 / RSS-210 A2.9| N/A
Transmitter Field Strength and Bandwidth Requirement| 15.235 / RSS-310 3.9| N/A
Receiver / Digital Device Radiated Emissions| 15.109 / ICES-003| N/A
Digital Device Conducted Emissions| 15.107 / ICES-003| N/A

Note: The EUT uses a dedicated antenna, by section 15.203, which is considered sufficient to comply with the provisions of this section. Under FCC part 15 Section 15.215(c), the 20 dB bandwidth of the emission was contained within the frequency band designated (mentioned above) which the EUT operated. The effects, if any, from frequency sweeping, frequency hopping, other modulation techniques, and frequency stability over excepted variations in temperature and supply voltage were considered.

General Description

Product Description
The equipment under test (EUT) is a transmitter for Big Wheels operating at 27.145 MHz which is controlled by a crystal. The EUT is powered by two 1.5 V AA batteries. For more detailed information pls. refer to the user manual.

Antenna Type: dedicated antenna
Type of modulation: Pulse modulation
Antenna Gain: 0 dBi.
For electronic filing, the brief circuit description is saved with filename: descri.pdf.

Related Submittal(s) Grants
This is an application for certification of a controller unit for the Big Wheels, and the corresponding receiver unit associated with this EUT is subjected to FCC SDOC.

Test Methodology
Radiated emission measurements were performed according to the procedures in ANSI C63.10 (2013). Radiated Emission measurement was performed in a Semi- anechoic chamber. Preliminary scans were performed in the Semi-anechoic chamber only to determine worst-case modes. All Radiated tests were performed at an antenna to EUT distance of 3 meters unless stated otherwise in the “Justification Section” of this Application.

Test Facility
The Semi-anechoic chamber and shielding room used to collect the radiated data and conducted data are Intertek Testing Services Shenzhen Ltd. Longhua Branch and located at No.101&201, Building B, No.308, Wuhe Avenue, Zhangkengjing, Guanhu Subdistrict, Longhua District, Shenzhen, Guangdong, China/518110. This test facility and site measurement data have been fully placed on file with File Number: CN1188.

System Test Configuration

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 C63.10 (2013). The EUT was powered by two new 1.5 V AA batteries during the test. For maximizing emissions below 30 MHz, the EUT was rotated through 360°, the bottom of the loop antenna was placed 1 meter above the ground, and the antenna polarization was changed. For maximizing emission at and above 30 MHz, 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 report 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 mounted to a plastic stand if necessary and placed on the polystyrene turntable, which enabled the Senior Engineer to maximize emissions through its placement in the three orthogonal axes.

EUT Exercising Software
There was no special software to exercise the device. Once the unit is powered up, it can transmit the RF signal continuously.

Special Accessories
There are no special accessories necessary for compliance with this product.

Equipment Modification
Any modifications installed previous to testing by AUXO INTERNATIONAL LTD will be incorporated in each production model sold/leased in the United States. No modifications were installed by Intertek Testing Services Shenzhen Ltd.
Longhua Branch.

Measurement Uncertainty
When determining the test conclusion, the Measurement Uncertainty of the test has been considered. 2.6 Support Equipment List and Description N/A.

Emission Results

Data is included in the 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.

Field Strength Calculation
The field strength is calculated by adding the Antenna Factor and Cable Factor, and subtracting the Amplifier Gain (if any), Average Factor (optional) from the measured reading. The basic equation with a sample calculation is as follows:

• FS = RA + AF + CF – AG – 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
• AV = Average Factor in dB

In the following table(s), the reading shown on the data table reflects the preamplifier gain. An example of the calculations in the following table is as follows:

• FS = RR + LF
• where FS = Field Strength in dBµV/m
• RR = RA – AG – AV in dBµV
• LF = CF + AF in dB

Assume a receiver reading of 52.0 dBµV is obtained. The antenna factor of 7.4 dB and cable factor of 1.6 dB are added. The amplifier gain of 29 dB and average factor of 5 dB are subtracted, giving a field strength of 27 dBµV/m. This value in dBµV/m was converted to its corresponding level in µV/m.

• RA = 52.0 dBµV/m
• AF = 7.4 dB/m RR = 18.0 dBµV
• CF = 1.6 dB LF = 9.0 dB
• AG = 29.0 dB
• AV = 5.0 dB
• FS = RR + LF
• FS = 18 + 9 = 27 dBµV/m
• Level in µV/m = Common Antilogarithm [(27 dBµV/m)/20] = 22.4 µV/m

Radiated Emission Configuration Photograph

• Worst Case Radiated Emission at 380.030 MHz
• For electronic filing, the worst-case radiated emission configuration photographs are saved with the filename: radiated photos.pdf.

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 14.8dB

Polarization| Frequency (MHz)| Reading (dBµV)| Pre- Amp

Gain (dB)

| Antenna Factor (dB)| Average Factor (-dB)| Net at 3m

(dBµV/m)

| Limit at 3m

(dBµV/m)

| Margin (dB)
---|---|---|---|---|---|---|---|---
Horizontal| 27.145| 34.3| 0.0| 18.4| 4.3| 48.4| 80.0| -31.6
Horizontal| 54.29| 29.1| 20.0| 6.3| –| 15.4| 40.0| -24.6
Horizontal| 298.595| 37.8| 20.0| 7.8| –| 25.6| 46.0| -20.4
Horizontal| 352.885| 40.2| 20.0| 10.9| –| 31.1| 46.0| -14.9
Horizontal| 380.030| 39.9| 20.0| 11.3| –| 31.2| 46.0| -14.8
Horizontal| 407.175| 36.3| 20.0| 13.9| –| 30.2| 46.0| -15.8

TEST PERSONNEL
Sign on file
Maura Wang Engineer
Typed/Printed Name
August 03, 2024
Date

Applicant: AUXO INTERNATIONAL LTD
Date of Test: August 03, 2024 Model: 15598/16196
Worst Case Operating Mode: Transmitting

Table 1
Radiated Emissions

NOTES

1. Peak Detector Data unless otherwise stated.
2. All measurements were made at 3 meters. Harmonic emissions not detected at the 3-meter distances 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 meters.
3. The negative sign in the column shows a value below the limit.
4. The loop antenna is used for emissions below 30 MHz.
5. Emission is at least 36.97dB below the carrier level at the band edge (26.96MHz and 27.28 MHz).

Equipment Photographs
For electronic filing, the photographs are saved with filename: external photos.pdf and internal photos.pdf.

product Labelling
For electronics filing, the FCC ID label artwork and the label location are saved with the filename: label.pdf.

Technical Specifications
For electronic filing, the block diagram and schematic of the tested EUT are saved with filename: block.pdf and circuit.pdf respectively.

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.

Miscellaneous Information
This miscellaneous information includes details of the measured bandwidth, the test procedure, and the calculation of factors such as pulse desensitization and averaging factors.

Measured Bandwidth
test plots are attached as below which shows the fundamental emission is confined in the specified band. It also shows that the emission is at least 36.97dB below the carrier level at the band edge (26.96MHz and 27.28 MHz). It meets the requirement of Section 15.227(b).

Under FCC part 15 Section 15.215(c), the 20dB bandwidth of the emission was contained within the frequency band designated (mentioned above) which the EUT operated. The effects, if any, from frequency sweeping, frequency hopping, other modulation techniques, and frequency stability over excepted variations in temperature and supply voltage were considered. The test plots are attached below.

Discussion of Pulse Desensitization

The determination of pulse desensitivity was made by Hewlett Packard Application Note 150-2, Spectrum Analysis … Pulsed RF. The effective period (Teff) was approximately 0.5072ms and 1.5072ms for a digital “1” bit, as shown in the plots of Exhibit 8.3. With a resolution bandwidth (3 dB) of 100 kHz, the pulse desensitivity factor was 0 dB.

Calculation of Average Factor
Averaging factor in dB = 20 log (duty cycle) The specification for output field strengths by 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 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 bandwidth (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.

The duty cycle is simply the on-time divided by the period:

• The duration of one cycle = 18.3768ms
• Effective period of the cycle = 1.5072ms x 4 + 0.5217=ms x 10 =11.2458ms
• DC =11.2458 / 18.3768ms =0.6120 or 61.20%
• Therefore, the averaging factor is found by 20 log10(0.6120) =-4.3dB
• The test plots are attached below.

Intertek Report No. : SZHH01957054-001

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 C63.10 – 2013. The transmitting equipment under test (EUT) is placed on a polystyrene turntable which is four feet in diameter and approximately 0.8 meters 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 EUT 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.

The 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 of 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.

Emissions Test Procedures (contd)
The EUT is warmed up for 15 minutes before 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 C63.10 – 2013. The IF bandwidth used for measurement of radiated signal strength was 60 kHz for emission below 30 MHz and 120 kHz for emission from 30 MHz to 1000 MHz.

Where pulsed transmissions of short enough pulse duration warrant, greater bandwidth is selected according to the recommendations of Hewlett Packard Application Note 150-2. A discussion of whether pulse desensitivity applies to this unit is included in this report (See Exhibit 8.2). Transmitter measurements are normally conducted at a measurement distance of three meters. However, to ensure a low enough noise floor in the restricted bands, 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.

Equipment List

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| R&S| ESR7| 102466| 10-Nov-2023| 10-Nov-2024
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SZ062-12| RF Cable| RADIALL| RG 213U| —| 1-May-2024| 1-Nov-2024
SZ062-05| RF Cable| RADIALL| 0.04-

26.5GHz

| —| 1-May-2024| 1-Nov-2024
SZ061-06| Active Loop Antenna| Electro-Metrics| EM-6876| 217| 5-May-2024| 5-May-2027
SZ061-12| BiConiLog Antenna| ETS| 3142E| 00166158| 4-Aug-2021| 4-Aug-2024

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