FCC TEST REPORT

1 TEST RESULT CERTIFICATION

Applicant's name: Shenzhen xiaoxiang supply chain technology co., ltd

Address: Xinghe WORLD Twin Towers, No. 8 Yaxing Road, Nankeng Community, Bantian Street, Longgang District, Shenzhen West Tower 28th Floor 2801A-1

Manufacture's name: Shenzhen xiaoxiang supply chain technology co., ltd

Address: Xinghe WORLD Twin Towers, No. 8 Yaxing Road, Nankeng Community, Bantian Street, Longgang District, Shenzhen West Tower 28th Floor 2801A-1

Product name: HTC Wireless Earphones 35

Model name: HTC NE35

Standards: FCC CFR47 Part 15 Section 15.247

Test procedure: ANSI C63.10:2013

Test Date: June 12, 2025 to June 18, 2025

Date of Issue: June 18, 2025

Test Result: Pass

This device described above has been tested by PTC, and the test results show that the equipment under test (EUT) is in compliance with the FCC requirements. And it is applicable only to the tested sample identified in the report. This report shall not be reproduced except in full, without the written approval of PTC, this document may be altered or revised by PTC, personal only, and shall be noted in the revision of the document.

Test Engineer: Jack zhou / Engineer

Technical Manager: Simon Pu / Manager

2 Test Summary

3 TEST FACILITY

Company: Precise Testing & Certification Co., Ltd.

Address: Building 1, No. 6, Tongxin Road, Dongcheng Street, Dongguan, Guangdong, China

FCC Registration Number: 790290

A2LA Certificate No.: 4408.01

IC Registration Number: 12191A

FCC Designation Number: CN1219

4 General Information

4.1 General Description of E.U.T.

4.2 Test Mode

The EUT has been tested under its typical operating condition. Pre-defined engineering program for regulatory testing used to control the EUT for staying in continuous transmitting. Both the left and right headphones have been tested, and in the absence of special instructions, only the worst data, that of the left ear, is recorded.

The EUT has been associated with peripherals pursuant to ANSI C63.10-2013 and configuration operated in a manner tended to maximize its emission characteristics in a typical application. Frequency range investigated: radiation (9 KHz to the 10th harmonics of the highest fundamental frequency or to 40 GHz, whichever is lower).

The EUT has been tested under TX operating condition.

This EUT is a FHSS system, were conducted to determine the final configuration from all possible combinations. We use software control the EUT, Let EUT hopping on and transmit with highest power, all the modes GFSK, π/4-DQPSK, 8DPSK have been tested. 79 Channels are provided by EUT. The 3 channels of lower, medium and higher were chosen for test.

Channel List:

Selected Channels for Test:

5 Equipment During Test

5.1 Equipments List

RF Conducted Test

Remark: The temporary antenna connector is soldered on the PCB board in order to perform conducted tests and this temporary antenna connector is listed in the equipment list.

Radiated Emissions

Conducted Emissions

5.2 Measurement Uncertainty

5.3 Description of Support Units

6 Conducted Emission

Test Requirement: FCC CFR 47 Part 15 Section 15.207

Test Method: ANSI C63.10:2013

Test Result: PASS

Frequency Range: 150kHz to 30MHz

Class/Severity: Class B

Detector: Peak for pre-scan (9kHz Resolution Bandwidth)

6.1 E.U.T. Operation

Operating Environment:

• Temperature: 23.2 °C
• Humidity: 51 % RH
• Atmospheric Pressure: 101.12 kPa
• Test Voltage: AC 120V/60Hz

6.2 EUT Setup

The conducted emission tests were performed using the setup accordance with the ANSI C63.10: 2013.

6.3 Test SET-UP (Block Diagram of Configuration)

The test setup involves an AC Mains power source connected to a Line Impedance Stabilization Network (LISN), which is connected to the Equipment Under Test (EUT). A Test Receiver is also connected to the LISN. A 50Ω terminator is indicated.

6.4 Measurement Procedure:

1. The EUT was placed on a table, which is 0.8m above ground plane.
2. Maximum procedure was performed on the six highest emissions to ensure EUT compliance.
3. Repeat above procedures until all frequency measured was complete.

6.5 Conducted Emission Limit

Note: 1. The lower limit shall apply at the transition frequencies. 2. The limit decreases in line with the logarithm of the frequency in the range of 0.15 to 0.50MHz.

6.6 Measurement Description

The maximised peak emissions from the EUT were scanned and measured for both the Live and Neutral Lines. Quasi-peak & average measurements were performed if peak emissions were within 6dB of the average limit line.

6.7 Conducted Emission Test Result

PASS.

Conducted emission at both 120V & 240V is assessed, and emission at 120V represents the worst case. All the modulation modes were tested; the data of the worst mode (GFSK) are recorded in the following pages and the others modulation methods do not exceed the limits.

Line -120V/60Hz:

Neutral -120V/60Hz:

7 Radiated Spurious Emissions

Test Requirement: FCC CFR47 Part 15 Section 15.209 & 15.247

Test Method: ANSI C63.10:2013

Test Result: PASS

Measurement Distance: 3m

Limit: See the follow table

7.1 EUT Operation

Operating Environment:

• Temperature: 24.5 °C
• Humidity: 55.5% RH
• Atmospheric Pressure: 101.3kPa
• Test Voltage: DC 3.7V

7.2 Test Setup

The radiated emission tests were performed in the 3m Semi-Anechoic Chamber test site.

Test setup for emission measurement below 30MHz:

The setup includes the EUT on a table 0.8m high, connected to a System Simulator. A Spectrum Analyzer/Receiver is connected, and an RX Antenna is positioned 1m from the ground. The test distance is 3m.

Test setup for emission measurement from 30 MHz to 1 GHz:

The setup includes the EUT on a table 0.8m high, connected to a System Simulator. A Spectrum Analyzer/Receiver is connected, and an RX Antenna (with adjustable height 1-4m) is positioned 3m away. The antenna feed point is at a height of 1-4m.

Test setup for emission measurement above 1 GHz:

The setup includes the EUT on a table 1.5m high, connected to a System Simulator. A Spectrum Analyzer/Receiver is connected, and an RX Antenna (with adjustable height 1-4m) is positioned 3m away. The antenna feed point is at a height of 1-4m.

7.3 Spectrum Analyzer Setup

Spectrum Parameter

Receiver Parameter

7.4 Test Procedure

1. The testing follows the guidelines in Spurious Radiated Emissions of ANSI C63.10-2013.
2. Below 1000MHz, The EUT was placed on a turn table which is 0.8m above ground plane. And above 1000MHz, The EUT was placed on a styrofoam table which is 1.5m above ground plane.
3. The EUT was set 3 meters from the interference receiving antenna, which was mounted on the top of a variable height antenna tower.
4. For each suspected emission, the EUT was arranged to its worst case and then tune the Antenna tower (From 1m to 4m) and turntable (from 0 degree to 360 degree) to find the maximum reading. A pre-amp and a high pass filter are used for the test in order to get better signal level to comply with the guidelines.
5. Set to the maximum power setting and enable the EUT transmit continuously.
6. Final measurement (Above 1GHz): The frequency range will be divided into different sub ranges depending of the frequency range of the used horn antenna. The EMI Receiver set to peak and average mode and a resolution bandwidth of 1MHz. The measurement will be performed in horizontal and vertical polarization of the measuring antenna and while rotating the EUT in its vertical axis in the range of 0 degree to 360 degree in order to have the antenna inside the cone of radiation.
7. Test Procedure of measurement (For Above 1GHz):
1. Monitor the frequency range at horizontal polarization and move the antenna over all sides of the EUT(if necessary move the EUT to another orthogonal axis).
2. Change the antenna polarization and repeat 1) with vertical polarization.
3. Make a hardcopy of the spectrum.
4. Measure the frequency of the detected emissions with a lower span and resolution bandwidth to increase the accuracy and note the frequency value.
5. Change the analyser mode to Clear/ Write and found the cone of emission.
6. Rotate and move the EUT, so that the measuring distance can be enlarged to 3m and the antenna will be still inside the cone of emission.
7. Measure the level of the detected frequency with the correct resolution bandwidth, with the antenna polarization and azimuth and the peak and average detector, which causes the maximum emission.
8. Repeat steps 1) to 7) for the next antenna spot if the EUT is larger than the antenna beamwidth.
8. The radiation measurements are tested under 3-axes(X,Y,Z) position(X denotes lying on the table, Y denotes side stand and Z denotes vertical stand), After pre-test, It was found that the worse radiation emission was get at the X position. So the data shown was the X position only.

7.5 Summary of Test Results

Test Frequency: 30MHz ~ 1GHz

Please refer to the following test plots, Low Channel (2402MHz) Worst case GFSK for record:

L: Test plot for Horizontal

Remark: Emission Level=Reading+Cable Loss+ANT Factor-AMP Factor

Test plot for Vertical

Remark:Emission Level=Reading+Cable Loss+ANT Factor-AMP Factor

R: Test plot for Horizontal

Remark: Emission Level=Reading+Cable Loss+ANT Factor-AMP Factor

Test plot for Vertical

Remark: Emission Level=Reading+Cable Loss+ANT Factor-AMP Factor

Test Frequency 1GHz-25GHz

Bluetooth (GFSK, Pi/4-DQPSK, 8DPSK) mode have been tested, and the worst result GFSK mode was report as below:

L:

Test Mode: CH00 GFSK

Test channel: Lowest

Peak Value

Average Value

Test Mode: CH39 GFSK

Test channel: Middle

Peak Value

Average Value

Test Mode: CH78 GFSK

Test channel: Highest

Peak Value

Average Value

Note: 1. The testing has been conformed to 10*2480MHz=24800MHz. 2. All other emissions more than 30dB below the limit. 3. Factor = Antenna Factor + Cable Loss – Pre-amplifier. Emission Level = Reading + Factor Over Limit =Emission Level-Limit

Spurious Emission in Restricted Band 2310-2390MHz and 2483.5-2500MHz

Bluetooth (GFSK, Pi/4-DQPSK, 8DPSK) mode have been tested, and the worst result GFSK model was report as below

L

Test Mode: Low Channel 2402MHz

Peak Value

Test Mode: High Channel 2480MHz

Peak Value

R

Test Mode: Low Channel 2402MHz

Peak Value

Test Mode: High Channel 2480MHz

Peak Value

8 Maximum Peak Output Power Test

8.1 Test Standard and Limit

8.2 Test Setup

The test setup consists of the EUT connected to a Spectrum Analyzer via an RF cable and attenuator.

8.3 Test Procedure

1. The testing follows the Measurement Procedure of FCC KDB No. 558074 D01 15.247 Meas Guidance v05 section 8.3.1.
2. The RF output of EUT was connected to the spectrum analyzer by RF cable and attenuator. The path loss was compensated to the results for each measurement.
3. Set to the maximum power setting and enable the EUT transmit continuously.
4. Measure the conducted output power and record the results in the test report.

8.4 Test Data

Test Item: Max. peak output power

Test Voltage: 3.7V

Test Result: PASS

Test Mode: CH Low ~ CH High

Temperature: 24.5°C

Humidity: 55%RH

L:

R: