Test Report

For

Applicant: Wonders Technology Co., Ltd

Address: DOSS Industrial Zone, Qiping Kengdu Industrial Area, Guihua Village, Guanlan Town Baoan District, ShenZhen, China

Product Name: Wireless Portable Bluetooth Speaker

Model Name: DOSS SoundBox xs, HP1003

Remark: Only difference in the model name

Brand Name: N/A

FCC Number: FCC ID: WC2-1003

Date of Issue: Jun.15, 2017

Issued by: Most Technology Service Co., Ltd.

Address: No.5, 2nd Langshan Road, North District, Hi-tech Industrial Park, Nanshan, Shenzhen, Guangdong, China

Tel: 86-755-8602 6850

Fax: 86-755-2601 3350

The report consists 36 pages in total. It may be duplicated completely for legal use with the approval of the applicant. It should not be reproduced except in full, without the written approval of our laboratory. The client should not use it to claim product endorsement by MOST. The test results in the report only apply to the tested sample. The test report shall be invalid without all the signatures of testing engineers, reviewer and approver.

Table of Contents

1. PRODUCT INFORMATION

2. GENERAL INFORMATION

• 2.1 Product Information
• 2.2 Objective
• 2.3 Test Standards and Results
• 2.4 Environmental Conditions

3. TEST METHODOLOGY

• 3.1 TEST FACILITY
• 3.2 GENERAL TEST PROCEDURES

4. SETUP OF EQUIPMENT UNDER TEST

• 4.1 SETUP CONFIGURATION OF EUT
• 4.2 SUPPORT EQUIPMENT
• 4.3 TEST EQUIPMENT LIST

5.1 ANTENNA REQUIREMENT

• 5.1.1 Applicable Standard
• 5.1.2 Evaluation Criteria
• 5.1.3 Result: Compliance.

5.2 AC Power Line Conducted Emission

• 5.2.1 Requirement
• 5.2.2 Block Diagram of Test Setup
• 5.2.3 Test procedure
• 5.2.4 Test Result

5.3 Radiated Emission

• 5.3.1 Requirement
• 5.3.2 Test Configuration
• 5.3.3 Test Procedure:
• 5.3.4 Test Result

5.4 Conducted Peak Output Power

• 5.4.1 Requirement
• 5.5.2 Block Diagram of Test Setup
• 5.5.3 Test Procedure
• 5.4.4 Test Result

5.5 6dB Emission Bandwidth

• 5.5.1 Test Requirement
• 5.6.2 Block Diagram of Test Setup
• 5.5.3 Test Procedure
• 5.5.4 Test Result

5.6 POWER SPECTRAL DENSITY

• 5.6.1 Applicable Standard
• 5.6.2 Block Diagram of Test Setup
• 5.6.3 Test Procedure
• 5.6.4 Test Result

5.7 Band Edge and Conducted Spurious Emissions

• 5.7.1 Test Requirement
• 5.7.2 Test Procedure
• 5.7.3 Test Result

5.8 Restricted Frequency Bands

• 5.8.1 Test Requirement
• 5.8.2 Test Configuration
• 5.8.3 Test Procedure:
• 5.8.4 Test Result

1. PRODUCT INFORMATION

The above equipment was tested by Most Technology Service Co., Ltd. for compliance with the requirements set forth in FCC rules and the Technical Standards mentioned above. This said equipment in the configuration described in this report shows the maximum emission levels emanating from equipment and the level of the immunity endurance of the equipment are within the compliance requirements.

The test results of this report relate only to the tested sample identified in this report.

Prepared by: Chloe Cai (Engineer)

Review by: John Lin (Engineer)

Approved by: Yvette Zhou (Manager)

2. GENERAL INFORMATION

2.1 Product Information

NOTE: 1. For a more detailed features description about the EUT, please refer to User's Manual.

2.2 Objective

The objective of the report is to perform tests according to FCC Part 15 Subpart C for the EUT FCC ID Certification:

2.3 Test Standards and Results

Note: 1. The test result judgment is decided by the limit of measurement standard. 2. The information of measurement uncertainty is available upon the customer's request.

2.4 Environmental Conditions

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

• Temperature: 15-35°C
• Humidity: 30-60 %
• Atmospheric pressure: 86-106 kPa

3. TEST METHODOLOGY

3.1 TEST FACILITY

Test Site: Most Technology Service Co., Ltd

Location: No.5, Langshan 2nd Rd., North Hi-Tech Industrial park, Nanshan, Shenzhen, Guangdong, China

Description: There is one 3m semi-anechoic an area test sites and two line conducted labs for final test. The Open Area Test Sites and the Line Conducted labs are constructed and calibrated to meet the FCC requirements in documents ANSI C63.10:2013 and CISPR 16 requirements.

Site Filing: The FCC Registration Number is 490827. The IC Registration Number is 7103A-1. The site description is on file with the Federal Communications Commission, 7435 Oakland Mills Road, Columbia, MD 21046.

Instrument Tolerance: All measuring equipment is in accord with ANSI C63.10:2013 and CISPR 16 requirements that meet industry regulatory agency and accreditation agency requirement.

Ground Plane: Two conductive reference ground planes were used during the Line Conducted Emission, one in vertical and the other in horizontal. The dimensions of these ground planes are as below. The vertical ground plane was placed distancing 40 cm to the rear of the wooden test table on where the EUT and the support equipment were placed during test. The horizontal ground plane projected 50 cm beyond the footprint of the EUT system and distanced 80 cm to the wooden test table. For Radiated Emission Test, one horizontal conductive ground plane extended at least 1m beyond the periphery of the EUT and the largest measuring antenna, and covered the entire area between the EUT and the antenna.

3.2 GENERAL TEST PROCEDURES

Radiated Emissions

The EUT was placed on the top of a wooden table 0.8 meters (for measurement at frequency below 1GHz) and a wooden table 1.5 meters (for measurement at frequency above 1GHz) above the ground at a 3 meter semi-anechoic camber. The table was rotated 360 degrees to determine the position of the highest radiation, exploratory radiated emission measurements were made according to the requirements in Section 6.5 of ANSI C63.10:2013.

Conducted Emissions

The EUT is placed on the turntable, which is 0.8 m above ground plane. According to the requirements in Section 6.2 of ANSI C63.10:2013, Conducted emissions from the EUT measured in the frequency range between 0.15 MHz and 30MHz using CISPR Quasi-peak and average detector modes.

4. SETUP OF EQUIPMENT UNDER TEST

4.1 SETUP CONFIGURATION OF EUT

See test photographs attached in Appendix 1 for the actual connections between EUT and support equipment.

4.2 SUPPORT EQUIPMENT

Remark: All the equipment/cables were placed in the worst-case configuration to maximize the emission during the test. Grounding was established in accordance with the manufacturer's requirements and conditions for the intended use.

4.3 TEST EQUIPMENT LIST

Instrumentation: The following list contains equipment used at Most for testing. The equipment conforms to the CISPR 16-1 / ANSI C63.2 Specifications for Electromagnetic Interference and Field Strength Instrumentation from 10 kHz to 1.0 GHz or above.

NOTE: Equipments listed above have been calibrated and are in the period of validation.

5.1 ANTENNA REQUIREMENT

5.1.1 Applicable Standard

According to FCC § 15.203, 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.

5.1.2 Evaluation Criteria

• (a) Antenna must be permanently attached to the unit.
• (b) Antenna must use a unique type of connector to attach to the EUT.

Unit must be professionally installed, Installer shall be responsible for verifying that the correct antenna is employed with the unit.

5.1.3 Result: Compliance.

The EUT has one Internal Antenna arrangement, which was permanently attached and the antenna gain is 0 dBi, fulfill the requirement of this section.

5.2 AC Power Line Conducted Emission

5.2.1 Requirement

A radio apparatus that is designed to be connected to the public utility (AC) power line shall ensure that the radio frequency voltage, which is conducted back onto the AC power line on any frequency or frequencies within the and 150 kHz-30 MHz, shall not exceed the limits in the following table:

Note: 1. The lower limit shall apply at the band edges. 2. The limit decreases linearly with the logarithm of the frequency in the range 0.15 MHz to 0.50 MHz.

5.2.2 Block Diagram of Test Setup

The test setup involves the EUT connected to a Line Impedance Stabilization Network (LISN), which is then connected to a Receiver. The LISN provides a 50ohm/50uH coupling impedance. The setup includes a ground plane and the receiver is positioned appropriately.

5.2.3 Test procedure

1. The E.U.T and simulators are connected to the main power through a line impedance stabilization network (L.I.S.N.). This provides a 50ohm/50uH coupling impedance for the measuring equipment.
2. Exploratory measurements were made to identify the frequency of the emission that has the highest amplitude relative to the limit;
3. The peripheral devices are also connected to the main power through a LISN that provides a 50ohm/50uH coupling impedance with 50ohm termination.
4. Both sides of A.C. line are checked for maximum conducted interference. In order to find the maximum emission, the relative positions of equipment and all of the interface cables must be changed according to ANSI C63.10:2013 on conducted measurement.
5. The bandwidth of test receiver (ESCI) set at 9 KHz.
6. All data was recorded in the Quasi-peak and average detection mode.

5.2.4 Test Result

PASS

Note: All test modes are performed, only the worst case is recorded in this report.

The report includes graphical data showing measured RF line voltage against the specified limits for Phase L1 and Phase N, with readings for QP and AVG detectors. Specific data points are listed in accompanying tables.

5.3 Radiated Emission

5.3.1 Requirement

According to FCC section 15.247(d), radiated emissions falling within restricted bands must comply with the limits specified in §15.209(a). According to FCC section 15.209(a), emissions from an intentional radiator shall not exceed the field strength levels specified in the table below:

Note: 1. For Above 1000MHz, the emission limit is based on average detector, with peak detector measurements corresponding to 20dB above the maximum permitted average limit. 2. For above 1000MHz, limit field strength of harmonics: 54dBuV/m@3m (AV) and 74dBuV/m@3m (PK).

5.3.2 Test Configuration

Test Setup for radiated emissions from 9kHz to 30MHz: The EUT is placed on a turntable 0.8m high. A test receiver is placed 3m away, connected via a coaxial cable. A ground plane is present.

Test Setup for radiated emissions from 30MHz to 1GHz: The EUT is placed on a turntable 0.8m high. A Bilog antenna on an antenna tower is placed 3m away and connected to a spectrum analyzer. A reference ground plane is present.

Test Setup for radiated emissions above 1GHz: The EUT is placed on a turntable 1.5m high. A horn antenna on an antenna tower is placed 3m away and connected to a spectrum analyzer and pre-amplifier.

5.3.3 Test Procedure:

1. The EUT was placed on the top of a wooden table 0.8 meters (for measurement at frequency below 1GHz) and a wooden table 1.5 meters (for measurement at frequency above 1GHz) above the ground at a 3 meter semi-anechoic camber. The table was rotated 360 degrees to determine the position of the highest radiation.
2. The EUT was set 3 meters away from the interference-receiving antenna, which was mounted on the top of a variable-height antenna tower.
3. The antenna height is varied from one meter to four meters above the ground to determine the maximum value of the field strength. Both horizontal and vertical polarizations of the antenna are set to make the measurement.
4. For each suspected emission, the EUT was arranged to its worst case and then the antenna was tuned to heights from 1 meter to 4 meters and the table was turned from 0 degrees to 360 degrees to find the maximum reading.
5. Spectrum analyzer settings were adjusted for peak, QP, and average detection modes as specified for different frequency ranges.

5.3.4 Test Result

PASS

Remark: Pre-scans identified the GFSK modulation Low channel as the worst case for emissions above and below 1GHz. The Y-axis orientation was found to be the worst case. For emissions from 9kHz to 30MHz, test results show a margin of over -20db.

The report includes graphical data and tables showing measured radiated emission levels across various frequency bands (below 1GHz, above 1GHz) for horizontal and vertical polarizations, indicating compliance with the specified limits.

5.4 Conducted Peak Output Power

5.4.1 Requirement

According to FCC section 15.247(b)(3), for systems using digital modulation in the 902-928 MHz, 2400-2483.5 MHz, and 5725-5850 MHz bands: 1 Watt. Compliance can be based on the measurement of the maximum conducted output power. Maximum Conducted Output Power is defined as the total transmit power delivered to all antennas and antenna elements averaged across all symbols in the signaling alphabet when the transmitter is operating at its maximum power control level.

5.5.2 Block Diagram of Test Setup

The test setup involves the EUT connected via a low attention attenuation RF cable to a Power Meter. The setup is performed on a non-conducted table with a ground reference plane.

5.5.3 Test Procedure

1. Remove the antenna from the EUT and then connect a low attention attenuation RF cable (Cable loss =0.5dB) from the antenna port to the power meter.
2. Measurement using an RF peak power meter.
3. Report the worse case.

5.4.4 Test Result

Test Item: Peak Output Power

Test Engineer: Sunny

Temperature: 21°C

Relative Humidity: 57%

5.5 6dB Emission Bandwidth

5.5.1 Test Requirement

Systems using digital modulation techniques may operate in the 902–928 MHz, 2400–2483.5 MHz, and 5725-5850 MHz bands. The minimum 6 dB bandwidth shall be at least 500 kHz.

5.6.2 Block Diagram of Test Setup

The test setup involves the EUT connected via RF cable to a Spectrum Analyzer.

5.5.3 Test Procedure

According to KDB 558074 D01 DTS Meas Guidance v03r02 clause8.1 Option 1:

1. Set RBW = 100 kHz.
2. Set the video bandwidth (VBW) = 3×RBW.
3. Detector = Peak.
4. Trace mode = max hold.
5. Sweep = auto couple.
6. Allow the trace to stabilize.
7. Measure the maximum width of the emission that is constrained by the frequencies associated with the two outermost amplitude points (upper and lower frequencies) that are attenuated by 6 dB relative to the maximum level measured in the fundamental emission.

5.5.4 Test Result

Test Item: 6dB Emission Bandwidth

Test Engineer: Sunny

Temperature: 21°C

Relative Humidity: 57%

The report includes screenshots of spectrum analyzer displays for GFSK mode on channels 0, 19, and 39, showing the occupied bandwidth and 6dB bandwidth measurements.

5.6 POWER SPECTRAL DENSITY

5.6.1 Applicable Standard

For digitally modulated systems, the power spectral density conducted from the intentional radiator to the antenna shall not be greater than 8 dBm in any 3 kHz band during any time interval of continuous transmission. This power spectral density shall be determined in accordance with the provisions of paragraph (b) of this section. The same method of determining the conducted output power shall be used to determine the power spectral density.

5.6.2 Block Diagram of Test Setup

The test setup involves the EUT connected via RF cable to a Spectrum Analyzer.

5.6.3 Test Procedure

According to KDB 558074 D01 DTS Meas Guidance v03r01clause10.2:

1. Set analyzer center frequency to DTS channel center frequency.
2. Set the span to 1.5 times the DTS bandwidth.
3. Set the RBW to: 3 kHz ≤ RBW ≤ 100 kHz.
4. Set the VBW ≥ 3×RBW.
5. Detector = peak.
6. Sweep time = auto couple.
7. Trace mode = max hold.
8. Allow trace to fully stabilize.
9. Use the peak marker function to determine the maximum amplitude level within the RBW.
10. If measured value exceeds limit, reduce RBW (no less than 3 kHz) and repeat.

5.6.4 Test Result

Test Item: POWER SPECTRAL DENSITY

Test Engineer: Sunny

Temperature: 21°C

Relative Humidity: 57%

The report includes screenshots of spectrum analyzer displays for GFSK mode on channels 0, 19, and 39, showing the power spectral density measurements.

5.7 Band Edge and Conducted Spurious Emissions

5.7.1 Test Requirement

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. Attenuation below the general limits specified in §15.209(a) is not required.

5.7.2 Test Procedure

1. Check the calibration of the measuring instrument using either an internal calibrator or a known signal from an external generator.
2. Remove the antenna from the EUT and then connect to a low loss RF cable from the antenna port to a EMI test receiver, then turn on the EUT and make it operate in transmitting mode. Then set it to Low Channel and High Channel within its operating range, and make sure the instrument is operated in its linear range.
3. Set both RBW and VBW of spectrum analyzer to 100 kHz with a convenient frequency span including 100 kHz bandwidth from band edge.
4. Measure the highest amplitude appearing on spectral display and set it as a reference level. Plot the graph with marking the highest point and edge frequency.
5. Repeat above procedures until all measured frequencies were complete.

5.7.3 Test Result

PASS

Test Item: Band Edge

Test Engineer: Sunny

Temperature: 21°C

Relative Humidity: 57%

The report includes graphical data showing band edge measurements for GFSK mode, left and right sides, and conducted spurious emissions across various frequency ranges for GFSK mode on channels 0 and 19.

5.8 Restricted Frequency Bands

5.8.1 Test Requirement

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. In addition, radiated emissions which fall in the restricted bands, as defined in §15.205(a), must also comply with the radiated emission limits specified in §15.209(a) (see §15.205(c)).

5.8.2 Test Configuration

Test Setup: The test setup is similar to the radiated emissions setup for frequencies above 1GHz. It includes the EUT on a turntable 1.5m high, 3m distance to a horn antenna on an antenna tower, connected to a spectrum analyzer and pre-amplifier.

5.8.3 Test Procedure:

1. The EUT was placed on the top of a rotating table 1.5 meters above the ground at a 3 meter chamber. The table was rotated 360 degrees to determine the position of the highest radiation.
2. The EUT was set 3 meters away from the interference-receiving antenna, which was mounted on the top of a variable-height antenna tower.
3. The antenna height is varied from one meter to four meters above the ground to determine the maximum value of the field strength. Both horizontal and vertical polarizations of the antenna are set to make the measurement.
4. For each suspected emission, the EUT was arranged to its worst case and then the antenna was tuned to heights from 1 meter to 4 meters and the table was turned from 0 degrees to 360 degrees to find the maximum reading.

5.8.4 Test Result

PASS

Note: All test modes are performed, only the worst case is recorded in this report. Please refer the following plots.

The report includes graphical data showing radiated emissions in restricted frequency bands for GFSK mode on channels 0 and 39, for both horizontal and vertical polarizations, indicating compliance.