FCC TEST REPORT

Product Information

Product: Audio equipment

Model Name: DT8, DX6, DX8, DX12, DX16, DT12, DT16, DT8S, DT12S, DT16S, HT4, HT7, U4, U6, PA6, PA8, PA12, PA16, MX6, MX8, MX12, MX16, FG6, FG8, FG12, FG16, M4, M6, M8, G4, G6, G8, MG6, MG8, MG12, MG16, BM8, BM6, KA16, KA12, BO4-M, DPA10, DPA20, DPA30, DPA40, DPA50, DPA60, BN4, BW8, UF4, UF4-M, UF5-M, UF6-M, B4, B6, B8, AG8, AG12, TC8, TC12, TC16, PG6, PG8, PG12, PG16, V9, TG8, TG12, DA8, DA12, DA16, DA16, BF4+, DE8, BE8, F4, F6, F8, DX10C, DX12C, DX16C, DX32C, C4, C6, C8

Brand: N/A (Manufactured by ShenZhen Depusheng Electronics CO.,LTD)

Report No.: NCT24021325E1-1

Prepared for: ShenZhen Depusheng Electronics CO.,LTD, 406A-22, Building 2, Baolong, Anbo Tec, No. 2, Baolong 4th Rd, Baolong Community, Baolong Street, Longgang District, SZ, China

Prepared by: Shenzhen NCT Testing Technology Co., Ltd., A101&2F B2, Fuqiao 6th Area, Xintian Community, Fuhai Street, Baoan District, Shenzhen, People's Republic of China

Contact: TEL: 400-8868-419, FAX: 86-755-27790922, Web: http://www.ncttesting.cn

1 Test Result Certification

Applicant's name: ShenZhen Depusheng Electronics CO.,LTD

Address: 406A-22, Building 2, Baolong, Anbo Tec, No. 2, Baolong 4th Rd, Baolong Community, Baolong Street, Longgang District, SZ, China

Manufacturer's name: ShenZhen Depusheng Electronics CO.,LTD

Product name: Audio equipment

Model name: For details, see section 4.1 of this report

Standards: FCC CFR47 Part 15 Section 15.247

Test procedure: ANSI C63.10:2013

Test Date: May 20, 2024 - May 30, 2024

Date of Issue: May 31, 2024

Test Result: Pass

This device has been tested by NCT, and the test results show that the equipment under test (EUT) is in compliance with the FCC requirements. 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 NCT. This document may be altered or revised by NCT personnel only, and shall be noted in the revision of the document.

Test Engineer: Keven Wu

Technical Manager: Henry Wang

Contents Overview

• Test Result Certification
• Test Summary
• Test Facility
• General Information
• Equipment During Test
• Conducted Emission
• Radiated Spurious Emissions
• Maximum Peak Output Power Test
• 20dB Occupy Bandwidth Test
• Carrier Frequency Separation Test
• Number of Hopping Channel Test
• Dwell Time Test
• 100kHz Bandwidth of Frequency Band Edge Requirement
• Antenna Requirement
• Test Setup & EUT Photograph

2 Test Summary

The following table summarizes the test items and their results:

Remark: "N/A" denotes test is not applicable in this Test Report.

3 Test Facility

Site Description

EMC Lab.: Accredited by CNAS, 2022-09-27 (certificate valid until 2028.01.07). The laboratory has been assessed and proved to be in compliance with CNAS-CL01:2006 (identical to ISO/IEC 17025:2017).

Certificate Registration Number: L8251

Designation Number: CN1347

Test Firm Registration Number: 894804

Accredited by A2LA: June 14, 2023. Certificate Registration Number: 6837.01

Accredited by Industry Canada: November 09, 2018. Conformity Assessment Body Identifier: CN0150. Company Number: 30806

Name of Firm: Shenzhen NCT Testing Technology Co., Ltd.

Site Location: A101&2F B2, Fuqiao 6th Area, Xintian Community, Fuhai Street, Baoan District, Shenzhen, People's Republic of China

4 General Information

4.1 General Description of E.U.T.

Product Name: Audio equipment

Model Name: DT8

Sample ID: 24021325-001#

Sample(s) Status: Engineer sample

Series Model: DX6, DX8, DX12, DX16, DT12, DT16, DT8S, DT12S, DT16S, HT4, HT7, U4, U6, PA6, PA8, PA12, PA16, MX6, MX8, MX12, MX16, FG6, FG8, FG12, FG16, M4, M6, M8, G4, G6, G8, MG6, MG8, MG12, MG16, BM8, BM6, KA16, KA12, BO4-M, DPA10, DPA20, DPA30, DPA40, DPA50, DPA60, BN4, BW8, UF4, UF4-M, UF5-M, UF6-M, B4, B6, B8, AG8, AG12, TC8, TC12, TC16, PG6, PG8, PG12, PG16, V9, TG8, TG12, DA8, DA12, DA16, BF4+, DE8, BE8, F4, F6, F8, DX10C, DX12C, DX16C, DX32C, C4, C6, C8

Difference: All the same except the model number, appearance color and key shape.

Operating frequency: 2402-2480MHz

Numbers of Channel: 79 channels

Antenna Type: PCB Antenna

Antenna Gain: 2.34dBi

Type of Modulation: GFSK, π/4-DQPSK For DSS

Power supply: DC 8V from Adapter

Adapter Information: Description: AC/DC ADAPTER, Model No: YX-0902B, Input: AC 100-240V 50/60Hz, Output: DC 8V/2A

Hardware Version: N/A

Software Version: N/A

Remark: The Antenna gain is provided by customer from Antenna spec. and the laboratory will not be responsible for the accumulated calculation results which covers the information provided by the applicant.

4.2 Channel List

The EUT was tested under its typical operating condition. A pre-defined engineering program was used for regulatory testing to control the EUT for continuous transmitting. Only the worst case data were reported.

The EUT was associated with peripherals pursuant to ANSI C63.10-2013 and configured to maximize its emission characteristics. The frequency range investigated for radiation was 9 KHz to the 10th harmonics of the highest fundamental frequency or to 40 GHz, whichever is lower.

The EUT was tested under TX operating condition. This EUT is a FHSS system. Testing was conducted to determine the final configuration from all possible combinations. Software control was used to enable EUT hopping and transmit with the highest power. All modes (GFSK, π/4-DQPSK) were tested. The EUT provides 79 channels, with three channels (lower, medium, and higher) chosen for testing.

The channel list spans from 2402 MHz (Channel 0) to 2480 MHz (Channel 78), with channels incrementing by 1 MHz.

4.3 Test Setup Configuration

Conducted Emission Setup: The EUT is connected to an AC Line, which then goes through an Adapter to the EUT. The LISN is connected between the AC Mains and the EUT, and the LISN is connected to a Test Receiver and a 50Ω Terminator. The EUT is placed 0.8m above the ground plane. The LISN is 0.8m from the EUT.

Radiated Emission (30MHz-1GHz) Setup: The EUT is connected to an AC Line, which then goes through an Adapter to the EUT. The EUT is placed 0.8m above the ground plane. An RX Antenna is positioned 3m away from the EUT, with its height variable from 1m to 4m. A Spectrum Analyzer / Receiver is connected to the RX Antenna. A Metal Full Soldered Ground Plane is beneath the EUT.

Radiated Emission (above 1GHz) Setup: The EUT is connected to an AC Line, which then goes through an Adapter to the EUT. The EUT is placed 1.5m above the ground plane on a styrofoam table. An RX Antenna with an Ant. feed point is positioned 3m away from the EUT, with its height variable from 1m to 4m. A Spectrum Analyzer / Receiver is connected to the RX Antenna. A Metal Full Soldered Ground Plane is beneath the EUT.

4.4 Test Mode

Transmitting mode: The EUT is kept in continuously transmitting mode.

Remark: During the test, the test voltage was tuned from 85% to 115% of the nominal rated supply voltage. The worst case was found under the nominal rated supply condition, and only this condition's data is reported.

Test Software: FCC_assist_1.0.2.2

Power level setup: < 2 dBm

5 Equipment During Test

5.1 Equipments List

A comprehensive list of calibrated test equipment was utilized for both conducted and radiated emission tests. This includes shielded rooms, EMI test receivers, LISNs, various antennas (Bilog, Horn, Loop, Double Ridge Guide Horn), pre-amplifiers, spectrum analyzers, cables, and power sensors. All equipment was calibrated with specified due dates to ensure accuracy of measurements.

5.2 Measurement Uncertainty

5.3 Description of Support Units

The EUT was tested as an independent unit along with necessary accessories or support units. The primary support unit was the Audio equipment (Model: DT8). For detachable I/O cables, their specified lengths were considered.

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 a setup in accordance with ANSI C63.10:2013. The EUT was placed on a table 0.8m above the ground plane. A LISN was used to connect the EUT to the AC mains, and a receiver and PC system were connected to the LISN via a 50Ω terminator.

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. The above procedures were repeated until all frequencies measured were complete.

6.5 Conducted Emission Limit

Note: The lower limit applies at transition frequencies. 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 maximized 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

The conducted emission tests passed. Conducted emission at both 120V & 240V was assessed, with 120V representing the worst case. All modulation modes were tested, and the data for the worst mode (GFSK) are recorded in the full report, with other modulation methods not exceeding the limits. Detailed data tables are available in the full report.

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 following table for field strength limits at 3m measurement distance.

7.1 EUT Operation

Operating Environment:

• Temperature: 24.5 °C
• Humidity: 55.5% RH
• Atmospheric Pressure: 101.3 kPa
• Test Voltage: AC 120V/60Hz

7.2 Test Setup

Radiated emission tests were performed in a 3m Semi-Anechoic Chamber. The EUT was positioned on a turn table (below 1000MHz) or styrofoam table (above 1000MHz) at specified heights. An interference receiving antenna was mounted on a variable height tower 3 meters from the EUT. For frequencies below 30MHz, the EUT was 0.8m above the ground plane. For 30MHz-1GHz, the EUT was 0.8m above the ground plane. For above 1GHz, the EUT was 1.5m above the ground plane. All setups included a Metal Full Soldered Ground Plane.

7.3 Spectrum Analyzer Setup

7.4 Test Procedure

1. Testing followed guidelines in Spurious Radiated Emissions of ANSI C63.10-2013.
2. Below 1000MHz, the EUT was placed on a turn table 0.8m above ground plane. Above 1000MHz, the EUT was placed on a styrofoam table 1.5m above ground plane.
3. The EUT was set 3 meters from the interference receiving antenna, mounted on top of a variable height antenna tower.
4. For each suspected emission, the EUT was arranged to its worst case, and the Antenna tower (1m to 4m) and turntable (0 to 360 degrees) were tuned to find the maximum reading. A pre-amp and high pass filter were used to improve signal level.
5. The EUT was set to maximum power setting and continuously transmitting.
6. For final measurement (Above 1GHz), the frequency range was divided based on the horn antenna. The EMI Receiver was set to peak and average mode with a 1MHz resolution bandwidth. Measurement was performed in horizontal and vertical polarization while rotating the EUT in its vertical axis (0 to 360 degrees) to ensure the antenna was within the cone of radiation.
7. Test Procedure for Above 1GHz: Monitor frequency range at horizontal polarization, move antenna over all sides of EUT. Change antenna polarization and repeat. Make a hardcopy of the spectrum. Measure frequency of detected emissions with lower span and resolution bandwidth for accuracy. Change analyzer mode to Clear/Write and find cone of emission. Rotate and move EUT to enlarge measuring distance to 3m, ensuring antenna remains within cone of emission. Measure level of detected frequency with correct resolution bandwidth, antenna polarization, azimuth, and peak/average detector for maximum emission. Repeat steps for next antenna spot if EUT is larger than antenna beamwidth.
8. Radiation measurements were tested under 3-axes (X,Y,Z) positions. The worst radiation emission was found at the X position, and only this data is shown.

7.5 Summary of Test Results

Test Frequency: 9KHz-30MHz: The amplitude of spurious emission attenuated by more than 20dB below the permissible limit was not reported. Distance extrapolation factor = 40log(Specific distance/test distance)(dB); Limit line = Specific limits(dBuV) + distance extrapolation factor.

Test Frequency: 30MHz ~ 1GHz: Please refer to the full report for detailed test plots and data for the Low Channel (2402MHz) worst case GFSK mode.

Test Frequency: 1GHz-25GHz: Radiated spurious emissions were tested for GFSK and π/4-DQPSK modulation modes across Low, Middle, and High channels. All measured emission levels were found to be compliant with the specified limits. Detailed data tables for each channel and modulation type are available in the full report.

8 Maximum Peak Output Power Test

8.1 Test Standard and Limit

Test Standard: FCC Part15 C Section 15.247 (b)(3)

Test Limit: For frequency hopping systems operating in the 2400-2483.5 MHz band employing at least 75 non-overlapping hopping channels, and all frequency hopping systems in the 5725-5850 MHz band: 1 watt. For all other frequency hopping systems in the 2400-2483.5 MHz band: 0.125 watts.

8.2 Test Setup

The EUT is directly connected to a Spectrum Analyzer.

8.3 Test Procedure

1. The EUT was directly connected to the spectrum analyzer and antenna output port.
2. Spectrum Setting: RBW > the 20 dB bandwidth of the emission being measured. Span = approximately 5 times the 20 dB bandwidth, centered on a hopping channel. VBW > RBW. Sweep = auto. Detector function = peak. Trace = max hold.

8.4 Test Data

Please see the attachment for detailed data.

9 20DB Occupy Bandwidth Test

9.1 Test Standard

Test Standard: FCC Part15 C Section 15.247 (a)(1)

9.2 Test Setup

The EUT is directly connected to a Spectrum Analyzer.

9.3 Test Procedure

Using the following spectrum analyzer settings:

1. Span = approximately 2 to 3 times the 20dB bandwidth, centered on a hopping channel.
2. Set the RBW = 30 kHz.
3. Set the VBW = 100 kHz.
4. Sweep time = auto couple.
5. Detector function = peak.
6. Trace mode = max hold.
7. Allow trace to fully stabilize.

9.4 Test Data

Please see the attachment for detailed data.

10 Carrier Frequency Separation Test

10.1 Test Standard and Limit

Test Standard: FCC Part15 C Section 15.247 (a)(1)

Test Limit: >25KHz or >two-thirds of the 20 dB bandwidth

10.2 Test Setup

The EUT is directly connected to a Spectrum Analyzer.

10.3 Test Procedure

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

1. Span = Wide enough to capture the peaks of two adjacent channels.
2. Set the RBW = 30 kHz.
3. Set the VBW = 100 kHz.
4. Sweep time = auto couple.
5. Detector function = peak.
6. Trace mode = max hold.
7. Allow trace to fully stabilize.

10.4 Test Data

Please see the attachment for detailed data.

11 Number of Hopping Channel Test

11.1 Test Standard and Limit

Test Standard: FCC Part15 C Section 15.247 (a)(1)

Test Limit: >15 channels

11.2 Test Setup

The EUT is directly connected to a Spectrum Analyzer.

11.3 Test Procedure

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

1. Span = the frequency band of operation.
2. Set the RBW = 100kHz.
3. Set the VBW = 300kHz.
4. Sweep time = auto couple.
5. Detector function = peak.
6. Trace mode = max hold.
7. Allow trace to fully stabilize.

11.4 Test Data

Please see the attachment for detailed data.

12 Dwell Time Test

12.1 Test Standard and Limit

Test Standard: FCC Part15 C Section 15.247 (a)(1)

Test Limit: 0.4 sec

12.2 Test Setup

The EUT is directly connected to a Spectrum Analyzer.

12.3 Test Procedure

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

1. Span = zero span, centered on a hopping channel.
2. Set the RBW = 1 MHz.
3. Set the VBW = 1 MHz.
4. Sweep time = as necessary to capture the entire dwell time per hopping channel.
5. Detector function = peak.
6. Trace mode = max hold.
7. Allow trace to fully stabilize.

12.4 Test Data

Please see the attachment for detailed data.

13 100kHz Bandwidth of Frequency Band Edge Requirement

13.1 Test Standard and Limit

Test Standard: FCC Part15 C Section 15.247 (d)

Test Limit: In any 100 kHz bandwidth outside the frequency bands in which the spread spectrum intentional radiator is operating, the radio frequency power produced by the intentional radiator shall be at least 20dB below that in the 100kHz bandwidth within the band that contains the highest level of the desired power. Additionally, radiated emissions falling in restricted bands (as defined in §15.205(a)) must comply with the radiated emission limits specified in 15.209(a).

13.2 Test Setup

The EUT is directly connected to a Spectrum Analyzer.

13.3 Test Procedure

The EUT must have its hopping/Non-hopping function enabled. Using the following spectrum analyzer settings:

1. Set the RBW = 100kHz.
2. Set the VBW = 300kHz.
3. Sweep time = auto couple.
4. Detector function = peak.
5. Trace mode = max hold.
6. Allow trace to fully stabilize.

13.4 Test Data

Please see the attachment for detailed data.

14 Antenna Requirement

14.1 Test Standard and Requirement

Test Standard: FCC Part15 Section 15.203 / 247(c)

Requirements:

1. 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 is permitted. 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.
2. Systems operating in the 2400-2483.5 MHz band used exclusively for fixed, point-to-point operations may employ transmitting antennas with directional gain greater than 6dBi, provided the maximum conducted output power of the intentional radiator is reduced by 1 dB for every 3 dB that the directional gain of the antenna exceeds 6 dBi.

14.2 Antenna Connected Construction

The antenna is a PCB Antenna which is permanently attached, and its best case gain is 2.34 dBi. This complies with the standard requirement.

15 Test Setup & EUT Photograph

Please see the attachment for details.