UGREEN HiTune Max5c Hybrid Active Noise-Cancelling Headphones

Report Information

Report No.: BL-SZ2430524-601

Applicant: Ugreen Group Limited

Address: UGREEN Building, Longcheng Industrial Park, Longguanxi Road, Longhua, ShenZhen, China

Equipment Type: UGREEN HiTune Max5c Hybrid Active Noise-Cancelling Headphones

Model Name: HP203

Brand Name: UGREEN

FCC ID: 2AQI5-HP203

Test Standard: 47 CFR Part 15 Subpart C

Sample Arrival Date: Mar. 12, 2024

Test Date: Mar. 25, 2024 - Apr. 07, 2024

Date of Issue: May 11, 2024

Issued By: Shenzhen BALUN Technology Co., Ltd.

Tested by: Julie Zhu

Checked by: Ye Hongji

Approved by: Hanson Lin (Vice General Manager)

Revision History

Table of Contents

1. GENERAL INFORMATION
   1. Test Laboratory
   2. Test Location
2. PRODUCT INFORMATION
   1. Applicant Information
   2. Manufacturer Information
   3. General Description for Equipment under Test (EUT)
   4. Technical Information
3. SUMMARY OF TEST RESULTS
   1. Test Standards
   2. Test Verdict
4. GENERAL TEST CONFIGURATIONS
   1. Test Environments
   2. Test Equipment List
   3. Test Software List
   4. Measurement Uncertainty
   5. Description of Test Setup
   6. Measurement Results Explanation Example
5. TEST ITEMS
   1. Antenna Requirements
      1. Relevant Standards
      2. Antenna Anti-Replacement Construction
      3. Antenna Gain
   2. Frequency Hopping Systems
      1. Relevant Standards
      2. Description of the systems
   3. Number of Hopping Frequencies
      1. Limit
      2. Test Setup
      3. Test Procedure
      4. Test Result
   4. Peak Output Power
      1. Test Limit
      2. Test Setup
      3. Test Procedure
      4. Test Result
   5. Occupied Bandwidth
      1. Limit
      2. Test Setup
      3. Test Procedure
      4. Test Result
   6. Carrier Frequency Separation
      1. Limit
      2. Test Setup
      3. Test Procedure
      4. Test Result
   7. Time of Occupancy (Dwell time)
      1. Limit
      2. Test Setup
      3. Test Procedure
      4. Test Result
   8. Conducted Spurious Emission & Authorized-band band-edge
      1. Limit
      2. Test Setup
      3. Test Procedure
      4. Test Result
   9. Conducted Emission
      1. Limit
      2. Test Setup
      3. Test Procedure

1 GENERAL INFORMATION

1.1 Test Laboratory

1.2 Test Location

2 PRODUCT INFORMATION

2.1 Applicant Information

2.2 Manufacturer Information

2.3 General Description for Equipment under Test (EUT)

2.4 Technical Information

The requirement for the following technical information of the EUT was tested in this report:

All channel was listed on the following table:

3 SUMMARY OF TEST RESULTS

3.1 Test Standards

3.2 Test Verdict

Note: The EUT has a permanently and irreplaceable attached antenna, which complies with the requirement FCC 15.203.

4 GENERAL TEST CONFIGURATIONS

4.1 Test Environments

During the measurement, the normal environmental conditions were within the listed ranges:

4.2 Test Equipment List

4.3 Test Software List

4.4 Measurement Uncertainty

The following measurement uncertainty levels have been estimated for tests performed on the EUT as specified in CISPR 16-4-2.

This uncertainty represents an expanded uncertainty expressed at approximately the 95% confidence level using a coverage factor of k=2.

4.5 Description of Test Setup

4.5.1 For Antenna Port Test

Conducted value (dBm) = Measurement value (dBm) + cable loss (dB)

For example: the measurement value is 10 dBm and the cable 0.5dBm used, then the final result of EUT: Conducted value (dBm) = 10 dBm + 0.5 dB = 10.5 dBm

[Diagram 1: Test setup for antenna port test showing EUT, Signal Generator, Vector Signal Generator, Display, Spectrum Analyzer, DSP, and PC]

4.5.2 For AC Power Supply Port Test

[Diagram 2: Test setup for AC power supply port test showing EUT, RF Module, Communication Antenna, Pulse Limiter, LISN, Receiver, and Service Supplier]

4.5.3 For Radiated Test (Below 30 MHz)

[Diagram 3: Test setup for radiated test (below 30 MHz) showing EUT, Antenna, and EMI Receiver]

4.5.4 For Radiated Test (30 MHz-1 GHz)

[Diagram 4: Test setup for radiated test (30 MHz-1 GHz) showing EUT, Antenna, Spectrum Analyzer, and Preamplifier]

4.5.5 For Radiated Test (Above 1 GHz)

[Diagram 5: Test setup for radiated test (above 1 GHz) showing EUT, Antenna, Spectrum Analyzer, and Preamplifier]

4.6 Measurement Results Explanation Example

4.6.1 For conducted test items:

The offset level is set in the spectrum analyzer to compensate the RF cable loss and attenuator between EUT conducted output port and spectrum analyzer. With the offset compensation, the spectrum analyzer reading level is exactly the EUT RF output level.

The spectrum analyzer offset is derived from RF cable loss and attenuator factor. Offset = RF cable loss + attenuator factor.

5 TEST ITEMS

5.1 Antenna Requirements

5.1.1 Relevant Standards

FCC §15.203 & 15.247(b)

An intentional radiator shall be designed to ensure that no antenna other than that furnished by the responsible party shall be used with the device. The use of a permanently attached antenna or of an antenna that uses a unique coupling to the intentional radiator shall be considered sufficient to comply with the provisions of this section. The manufacturer may design the unit so that a broken antenna can be replaced by the user, but the use of a standard antenna jack or electrical connector is prohibited. This requirement does not apply to carrier current devices or to devices operated under the provisions of § 15.211, § 15.213, § 15.217, § 15.219, or § 15.221. Further, this requirement does not apply to intentional radiators that must be professionally installed, such as perimeter protection systems and some field disturbance sensors, or to other intentional radiators which, in accordance with § 15.31(d), must be measured at the installation site. However, the installer shall be responsible for ensuring that the proper antenna is employed so that the limits in this part are not exceeded.

If directional gain of transmitting antennas is greater than 6 dBi, the power shall be reduced by the same level in dB comparing to gain minus 6 dBi. For the fixed point-to-point operation, the power shall be reduced by one dB for every 3 dB that the directional gain of the antenna exceeds 6 dBi. The use of a permanently attached antenna or of an antenna that uses a unique coupling to the intentional radiator shall be considered sufficient to comply with the FCC rule.

5.1.2 Antenna Anti-Replacement Construction

5.1.3 Antenna Gain

The antenna peak gain of EUT is less than 6 dBi. Therefore, it is not necessary to reduce maximum peak output power limit.

5.2 Frequency Hopping Systems

5.2.1 Relevant Standards

FCC §15.247(a) (1) (i) (ii) (iii) (iv); FCC §15.247(g); FCC §15.247(h)

Describe how the hopping sequence is generated. Provide an example of the hopping sequence channels, to demonstrate that the sequence meets the requirement specified in the definition of an FHSS system. Per the definition in Section 2.1(c), the hop set shall appear as random in the near term, shall appear as evenly distributed in the long term, and sequential hops shall be randomly distributed in both direction and magnitude of change.

Describe how each individual EUT meets the requirement that each of its hopping channels is used equally on average (e.g., that each new transmission event begins on the next channel in the hopping sequence after the final channel used in the previous transmission event).

Describe how the associated receiver(s) complies with the requirement that the input bandwidth (either RF or IF) matches the bandwidth of the transmitted signal.

Describe how the associated receiver(s) has the ability to shift frequencies in synchronization with the transmitted signals.

For short burst systems, describe how the EUT complies with the requirement that it be designed to be capable of operating as a true frequency hopping system. Specifically, the device shall comply with the equal frequency use and pseudorandom hopping sequence requirement when transmitting in short bursts, and shall be designed to comply when presented with continuous data (or information) stream.

Describe how the EUT complies with the requirement that it not have the ability to be coordinated with other FHSS systems in an effort to avoid the simultaneous occupancy of individual hopping frequencies by multiple transmitters.

5.2.2 Description of the systems

1. According to the preset procedure of the whole network, all the stations in the automatic control network synchronously change the frequency multiple times within one second, and temporarily stay on each frequency hopping channel. Periodic synchronization signaling is sent from the primary station, instructing all slaves to simultaneously change the operating frequency, then the hopping sequence is generated.
2. The hop set shall appear as random in the near term, shall appear as evenly distributed in the long term, and sequential hops shall be randomly distributed in both direction and magnitude of change.

Reference Documents:

[Image of spectrum analyzer plot 1]

[Image of spectrum analyzer plot 2]

1. Channels are classified into two categories, used and unused, where used channels are part of the hopping sequence and unused channels are replaced in the hopping sequence by used channels in a pseudo-random way. Make each individual EUT meets the requirement that each of its hopping channels is used equally on average.
2. The input bandwith and transmitted bandwith are both 1MHz, the associated receiver(s) complies with the requirement that the input bandwidth matches the bandwidth of the transmitted signal.
3. Connected devices communicate on the same physical channel by synchronizing with a common clock and hopping sequence.
4. EUT isn't short burst systems.
5. EUT can't have the ability to be coordinated with other FHSS systems in an effort.

5.3 Number of Hopping Frequencies

5.3.1 Limit

FCC §15.247(a) (1) (iii)

Frequency hopping systems operating in the 2400 MHz to 2483.5 MHz bands shall use at least 15 hopping frequencies.

5.3.2 Test Setup

See section 4.5.1 for test setup description for the antenna port. The photo of test setup please refer to ANNEX A.

5.3.3 Test Procedure

The EUT must have its hopping function enabled. Use the following spectrum analyzer settings:

• Span = The frequency band of operation
• RBW = To identify clearly the individual channels, set the RBW to less than 30% of the channel spacing or the 20 dB bandwidth, whichever is smaller.
• VBW ≥ RBW
• Sweep = auto
• Detector function = peak
• Trace = max hold
• Allow the trace to stabilize

5.3.4 Test Result

Test Plots

[Image of GFSK 2.4 GHz ~ 2.4415 GHz spectrum plot]

[Image of GFSK 2.4415 GHz ~ 2.4835 GHz spectrum plot]

[Image of π/4-DQPSK 2.4 GHz ~ 2.4415 GHz spectrum plot]

[Image of π/4-DQPSK 2.4415 GHz ~ 2.4835 GHz spectrum plot]

5.4 Peak Output Power

5.4.1 Test Limit

FCC § 15.247(b)

For frequency hopping systems operating in the 2400-2483.5 MHz band employing at least 75 non-overlapping hopping channels band: 1 watt. For all other frequency hopping systems in the 2400-2483.5 MHz band: 0.125 watts.

5.4.2 Test Setup

See section 4.5.1 for test setup description for the antenna port. The photo of test setup please refer to ANNEX A.

5.4.3 Test Procedure

The Module operates at hopping-off test mode. The lowest, middle and highest channels are selected to perform testing to verify the conducted RF output peak power of the Module.

Use the following spectrum analyzer settings:

• Span = approximately 5 times the 20 dB bandwidth, centered on a hopping channel
• RBW > the 20 dB bandwidth of the emission being measured
• VBW ≥ RBW
• Sweep = auto
• Detector function = peak
• Trace = max hold
• Allow the trace to stabilize.

5.4.4 Test Result

Peak Power Test Data

Test Plots

[Image of GFSK LOW CHANNEL spectrum plot]

[Image of GFSK MIDDLE CHANNEL spectrum plot]

[Image of GFSK HIGH CHANNEL spectrum plot]

[Image of π/4-DQPSK LOW CHANNEL spectrum plot]

[Image of π/4-DQPSK MIDDLE CHANNEL spectrum plot]

[Image of π/4-DQPSK HIGH CHANNEL spectrum plot]

5.5 Occupied Bandwidth

5.5.1 Limit

FCC §15.247(a)

Measurement of the 20dB bandwidth of the modulated signal.

5.5.2 Test Setup

See section 4.5.1 for test setup description for the antenna port. The photo of test setup please refer to ANNEX A.

5.5.3 Test Procedure

Use the following spectrum analyzer settings:

• Span = approximately 2 to 5 times the 20 dB bandwidth, centered on a hopping channel
• RBW = in the range of 1% to 5% of the OBW
• VBW ≥ RBW
• Sweep = auto
• Detector function = peak
• Trace = max hold
• The EUT should be transmitting at its maximum data rate, Allow the trace to stabilize.

5.5.4 Test Result

Test Data

Test Plots

[Image of 20 dB Bandwidth GFSK LOW CHANNEL spectrum plot]

[Image of 20 dB Bandwidth GFSK MIDDLE CHANNEL spectrum plot]

[Image of 20 dB Bandwidth GFSK HIGH CHANNEL spectrum plot]

[Image of 99% Bandwidth GFSK LOW CHANNEL spectrum plot]

[Image of 99% Bandwidth GFSK MIDDLE CHANNEL spectrum plot]

[Image of 99% Bandwidth GFSK HIGH CHANNEL spectrum plot]

[Image of 99% Bandwidth π/4-DQPSK LOW CHANNEL spectrum plot]

[Image of 99% Bandwidth π/4-DQPSK MIDDLE CHANNEL spectrum plot]

[Image of 99% Bandwidth π/4-DQPSK HIGH CHANNEL spectrum plot]

5.6 Carrier Frequency Separation

5.6.1 Limit

FCC §15.247(a)

Frequency hopping systems shall have hopping channel carrier frequencies separated by a minimum of 25 kHz or the 2/3 of the 20 dB bandwidth of the hopping channel, whichever is greater.

5.6.2 Test Setup

See section 4.5.1 for test setup description for the antenna port. The photo of test setup please refer to ANNEX A.

5.6.3 Test Procedure

The EUT must have its hopping function enabled. Use the following spectrum analyzer settings:

• Span = wide enough to capture the peaks of two adjacent channels
• Resolution (or IF) Bandwidth (RBW) ≥ 1% of the span
• Video (or Average) Bandwidth (VBW) ≥ RBW
• Sweep = auto
• Detector function = peak
• Trace = max hold
• Allow the trace to stabilize. Use the marker-delta function to determine the separation between the peaks of the adjacent channels.

5.6.4 Test Result

Test Plots

[Image of GFSK spectrum plot for carrier frequency separation]

[Image of π/4-DQPSK spectrum plot for carrier frequency separation]

5.7 Time of Occupancy (Dwell time)

5.7.1 Limit

FCC §15.247(a)

Frequency hopping systems in the 2400 MHz - 2483.5 MHz band shall use at least 15 non-overlapping channels. The average time of occupancy on any channel shall not be greater than 0.4 seconds within a period of 0.4 seconds multiplied by the number of hopping channels employed. Frequency hopping systems may avoid or suppress transmissions on a particular hopping frequency provided that a minimum of 15 channels are used.

5.7.2 Test Setup

See section 4.5.1 for test setup description for the antenna port. The photo of test setup please refer to ANNEX A.

5.7.3 Test Procedure

The EUT shall have its hopping function enabled. Use the following spectrum analyzer settings:

• Span: Zero span, centered on a hopping channel
• RBW shall be ≤ channel spacing and where possible RBW should be set >> 1 / T, where T is the expected dwell time per channel
• Sweep: As necessary to capture the entire dwell time per hopping channel; where possible use a video trigger and trigger delay so that the transmitted signal starts a little to the right of the start of the plot. The trigger level might need slight adjustment to prevent triggering when the system hops on an adjacent channel; a second plot might be needed with a longer sweep time to show two successive hops on a channel
• Detector function: Peak
• Trace: Max hold

Use the marker-delta function to determine the transmit time per hop. If this value varies with different modes of operation (data rate, modulation format, number of hopping channels, etc.), then repeat this test for each variation in transmit time.

The average time of occupancy on any channel within the Period can be calculated with formulas:

For GFSK and 8-DPSK:

For DH1 package type:
{Total of Dwell} = {Pulse Time} * (1600 / 2) / {Number of Hopping Frequency} * {Period}
{Period} = 0.4 s * {Number of Hopping Frequency}

For DH3 package type:
{Total of Dwell} = {Pulse Time} * (1600 / 4) / {Number of Hopping Frequency} * {Period}
{Period} = 0.4 s * {Number of Hopping Frequency}

For DH5 package type:
{Total of Dwell} = {Pulse Time} * (1600 / 6) / {Number of Hopping Frequency} * {Period}
{Period} = 0.4 s * {Number of Hopping Frequency}

For AFH Mode:

For DH1 package type:
{Total of Dwell} = {Pulse Time} * (800 / 2) / {Number of Hopping Frequency} * {Period}

The lowest, middle and highest channels are selected to perform testing to record the dwell time of each occupation measured in this channel, which is called Pulse Time here.

5.7.4 Test Result

Test Data

Test Plots

[Image of GFSK DH1 dwell time plot]

[Image of GFSK DH3 dwell time plot]

[Image of GFSK DH5 dwell time plot]

[Image of π/4-DQPSK 2DH1 dwell time plot]

[Image of π/4-DQPSK 2DH3 dwell time plot]

[Image of π/4-DQPSK 2DH5 dwell time plot]

[Image of AFH Mode DH1 dwell time plot]

[Image of AFH Mode DH3 dwell time plot]

[Image of AFH Mode DH5 dwell time plot]

5.8 Conducted Spurious Emission & Authorized-band band-edge

5.8.1 Limit

FCC §15.247(d)

In any 100 kHz bandwidth outside the frequency band in which the spread spectrum or digitally modulated intentional radiator is operating, the radio frequency power that is produced by the intentional radiator shall be at least 20 dB below that in the 100 kHz bandwidth within the band that contains the highest level of the desired power, based on either an RF conducted or a radiated measurement.

5.8.2 Test Setup

See section 4.5.1 for test setup description for the antenna port. The photo of test setup please refer to ANNEX A.

5.8.3 Test Procedure

Use the following spectrum analyzer settings:

• Span = wide enough to capture the peak level of the in-band emission and all spurious emissions (e.g., harmonics) from the lowest frequency generated in the EUT up through the 10th harmonic. Typically, several plots are required to cover this entire span.
• RBW = 100 kHz
• VBW = 300 kHz
• Sweep = auto
• Detector function = peak
• Trace = max hold
• Allow the trace to stabilize

5.8.4 Test Result

Test Plots

[Image of GFSK LOW CHANNEL, CARRIER LEVEL spectrum plot]

[Image of GFSK LOW CHANNEL, BAND EDGE spectrum plot]

[Image of GFSK LOW CHANNEL, SPURIOUS 30 MHz~3 GHz spectrum plot]

[Image of GFSK LOW CHANNEL, SPURIOUS 3 GHz~25 GHz spectrum plot]

[Image of GFSK MIDDLE CHANNEL, CARRIER LEVEL spectrum plot]

[Image of GFSK MIDDLE CHANNEL, SPURIOUS 30 MHz~3 GHz spectrum plot]

[Image of GFSK MIDDLE CHANNEL, SPURIOUS 3 GHz~25 GHz spectrum plot]

[Image of GFSK HIGH CHANNEL, CARRIER LEVEL spectrum plot]

[Image of GFSK HIGH CHANNEL, BAND EDGE spectrum plot]

[Image of GFSK HIGH CHANNEL, SPURIOUS 30 MHz~3 GHz spectrum plot]

[Image of GFSK HIGH CHANNEL, SPURIOUS 3 GHz~25 GHz spectrum plot]

[Image of π/4-DQPSK LOW CHANNEL, CARRIER LEVEL spectrum plot]

[Image of π/4-DQPSK LOW CHANNEL, BAND EDGE spectrum plot]

[Image of π/4-DQPSK LOW CHANNEL, SPURIOUS 30 MHz~3 GHz spectrum plot]

[Image of π/4-DQPSK LOW CHANNEL, SPURIOUS 3 GHz~25 GHz spectrum plot]

[Image of π/4-DQPSK MIDDLE CHANNEL, CARRIER LEVEL spectrum plot]

[Image of π/4-DQPSK MIDDLE CHANNEL, SPURIOUS 30 MHz~3 GHz spectrum plot]

[Image of π/4-DQPSK MIDDLE CHANNEL, SPURIOUS 3 GHz~25 GHz spectrum plot]

[Image of π/4-DQPSK HIGH CHANNEL, CARRIER LEVEL spectrum plot]

[Image of π/4-DQPSK HIGH CHANNEL, BAND EDGE spectrum plot]

[Image of π/4-DQPSK HIGH CHANNEL, SPURIOUS 30 MHz~3 GHz spectrum plot]

[Image of π/4-DQPSK HIGH CHANNEL, SPURIOUS 3 GHz~25 GHz spectrum plot]

5.9 Conducted Emission

5.9.1 Limit

FCC §15.207

For an intentional radiator that is designed to be connected to the public utility (AC) power line, the radio frequency voltage that is conducted back onto the AC power line on any frequency within the band 150 kHz to 30 MHz shall not exceed the limits in the following table, as measured using a 50μH/500 line impedance stabilization network (LISN).

5.9.2 Test Setup

See section 4.5.2 for test setup description for the AC power supply port. The photo of test setup please refer to ANNEX A.

5.9.3 Test Procedure

The maximum conducted interference is searched using Peak (PK), if the emission levels more than the AV and QP limits, and that have narrow margins from the AV and QP limits will be re-measured with AV and QP detectors. Tests for both L phase and N phase lines of the power mains connected to the EUT are performed. Refer to recorded points and plots below.

Devices subject to Part 15 must be tested for all available U.S. voltages and frequencies (such as a nominal 120 VAC, 50/60 Hz and 240 VAC, 50/60 Hz) for which the device is capable of operation. A device rated for 50/60 Hz operation need not be tested at both frequencies provided the radiated and line conducted emissions are the same at both frequencies.