EMC EMISSION - TEST REPORT

toa-iv

Test Report of Bluetooth

Hangzhou Tuya Information Technology Co.,Ltd VWRK4 Smart Audio Module with Wi-Fi and Bluetooth 2ANDL-VWRK4 2ANDLVWRK4 vwrk4

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Report Number: 708882003265-00

Report Number
Model Product Type Applicant Address
Production Facility Address

FCC - TEST REPORT

: 708882003265-00

Date of Issue: July 10, 2020

: VWRK4 : Smart Audio Module : Hangzhou Tuya Information Technology Co.,Ltd : Room701,Building3,More Center,No.87 GuDun
Road,Hangzhou,Zhejiang China : Newtronics Hangzhou Co.,Ltd : No.15,Jiu zhou Road,Jiang Gan Science&Technology
Economic Park Hangzhou

Test Result

:  Positive  Negative

Total pages including Appendices

: 57

TÜV SÜD Certification and Testing (China) Co., Ltd. Shanghai Branch is a subcontractor to TÜV SÜD Product Service GmbH according to the principles outlined in ISO 17025.
TÜV SÜD Certification and Testing (China) Co., Ltd. Shanghai Branch reports apply only to the specific samples tested under stated test conditions. Construction of the actual test samples has been documented. It is the manufacturer's responsibility to assure that additional production units of this model are manufactured with identical electrical and mechanical components. The manufacturer/importer is responsible to the Competent Authorities in Europe for any modifications made to the production units which result in non-compliance to the relevant regulations. TÜV SÜD Certification and Testing (China) Co., Ltd. Shanghai Branch shall have no liability for any deductions, inferences or generalizations drawn by the client or others from TÜV SÜD Certification and Testing (China) Co., Ltd. Shanghai Branch issued reports.
This report is the confidential property of the client. As a mutual protection to our clients, the public and ourselves, extracts from the test report shall not be reproduced except in full without our written approval.

EMC_SHA_F_R_02.03E

TÜV SÜD Certification and Testing (China) Co., Ltd. Shanghai Branch 3-13, No.151, Heng Tong Road, Shanghai, 200070, P.R. China Phone: +86 21 61410123, Fax:+86 21 61408600

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Report Number: 708882003265-00
1 Table of Contents
1 Table of Contents.............................................................................................................................. 2 2 Details about the Test Laboratory ..................................................................................................... 3 3 Description of the Equipment Under Test.......................................................................................... 4 4 Summary of Test Standards.............................................................................................................. 5 5 Summary of Test Results .................................................................................................................. 6 6 General Remarks .............................................................................................................................. 7 7 Test Setups....................................................................................................................................... 8 8 Systems test configuration .............................................................................................................. 11 9 Technical Requirement ................................................................................................................... 12
9.1 Conducted Emission ................................................................................................................ 12 9.2 Conducted peak output power ................................................................................................. 15 9.3 20 dB bandwidth ...................................................................................................................... 20 9.4 Carrier Frequency Separation .................................................................................................. 27 9.5 Number of hopping frequencies ............................................................................................... 30 9.6 Dwell Time ............................................................................................................................... 33 9.7 Spurious RF conducted emissions ........................................................................................... 36 9.8 Band edge testing .................................................................................................................... 42 9.9 Spurious radiated emissions for transmitter and receiver ......................................................... 49 10 Test Equipment List ........................................................................................................................ 54 11 System Measurement Uncertainty .................................................................................................. 55 12 Photographs of Test Set-ups........................................................................................................... 56 13 Photographs of EUT........................................................................................................................ 57

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2 Details about the Test Laboratory

Details about the Test Laboratory Test Site 1

Company name:

TÜV SÜD Certification and Testing (China) Co., Ltd. Shanghai Branch No.16 Lane, 1951 Du Hui Road, Shanghai 201108, P.R. China

Test Firm Registration Number:
Telephone: Fax:

820234
+86 21 6141 0123 +86 21 6140 8600

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3 Description of the Equipment Under Test

Product: Model no.: FCC ID: Options and accessories: Rating: RF Transmission Frequency:
No. of Operated Channel:
Modulation:
Antenna Type: Antenna Gain: Description of the EUT:

Smart Audio Module
VWRK4
2ANDL- VWRK4
NA
4.2V-5.5V
For 802.11b/g/n-HT20: 2412~2462 MHz (WiFi) For 802.11n-HT40: 2422~2452 MHz (WiFi) For 802.15.1:2402~2480 MHz (Classical Bluetooth +BLE4.2)
2.4GHz WIFI: 11 for 802.11b/802.11g/802.11(H20) 7 for 802.11n(H40)
2.4GHz BLE: 40 2.4GHz Classical BLE:79
Direct Sequence Spread Spectrum (DSSS) for 802.11b Orthogonal Frequency Division Multiplexing (OFDM) for 802.11g/n For 2.4GHz BLE: GFSK For 2.4GHz Classical BLE: GFSK, /4-DQPSK, 8DPSK
FPC antenna
2.5dBi
The Equipment Under Test (EUT) is a Smart Audio Module which support 2.4GHz WiFi, BLE and Classical Bluetooth. We tested it and listed the worst data in this report.

The sample's mentioned in this report is/are submitted/ supplied/ manufactured by client. The laboratory therefore assumes no responsibility for accuracy of information on the brand name, model number, origin of manufacture, consignment, antenna gain or any information supplied.

EMC_SHA_F_R_02.03E

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4 Summary of Test Standards
Test Standards FCC Part 15 Subpart C PART 15 - RADIO FREQUENCY DEVICES
Subpart C - Intentional Radiators All the test methods were according to Public Notice DA 00-705 -Frequency Hopper Spread Spectrum Test Procedure released by FCC on March 30, 2000; KDB 558074 D01 15.247 Meas Guidance v05r02 and C63.10 (2013).

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5 Summary of Test Results

FCC Part 15 Subpart C Test Condition §15.207 §15.247(b)(1) §15.247(a)(2) §15.247(a)(1) §15.247(a)(1) §15.247(a)(1)(iii) §15.247(a)(1)(iii) §15.247(e) §15.247(d) §15.247(d) §15.247(d) & §15.209 & §15.203

Technical Requirements

Conducted emission AC power port Conducted peak output power
6dB bandwidth

Pages 12-14 15-19
---

Test Site Site 1
Site 1
---

Test Result Pass
Pass
N/A

20dB bandwidth

20-26 Site 1

Pass

Carrier frequency separation Number of hopping frequencies Dwell Time

27-29 30-32 33-35

Site 1 Site 1 Site 1

Pass Pass Pass

Power spectral density* ---

---

N/A

Spurious RF conducted emissions Band edge

36-41 42-48

Site 1 Site 1

Pass Pass

Spurious radiated emissions for transmitter and receiver Antenna requirement

Site 1 51-53
See note 1

Pass Pass

Note 1: N/A=Not Applicable. Note 2: The EUT uses a patch antenna, which gain is 2.5dBi. In accordance to §15.203, It is considered sufficiently to comply with the provisions of this section.

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6 General Remarks
Remarks
This submittal(s) (test report) is intended for FCC ID: 2ANDL-VWRK4, complies with Section 15.207, 15.209, 15.247 of the FCC Part 15, Subpart C Rules.
This report is only for the 2.4GHz Classical Bluetooth test report, for the 2.4GHz BLE test report please refer to 708882003254-00 and 2.4GHz WiFi please refer to 708882003266-00

SUMMARY: All tests according to the regulations cited on page 5 were  - Performed  - Not Performed The Equipment Under Test  - Fulfills the general approval requirements.  - Does not fulfill the general approval requirements.

Sample Received Date: Testing Start Date: Testing End Date:

June 12, 2020 June 15, 2020 July 4, 2020

TÜV SÜD Certification and Testing (China) Co., Ltd. Shanghai Branch

Reviewed by:

Prepared by:

Tested by:

_______________________
Hui TONG Review Engineer

_______________________
Jiaxi XU Project Engineer

_______________________
Wenqiang LU Test Engineer

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7 Test Setups
7.1 AC Power Line Conducted Emission test setups
7.2 Radiated test setups 9kHz ~ 30MHz Test Setup:

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30MHz ~ 1GHz Test Setup:
1GHz ~ 18GHz Test Setup:

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18GHz ~ 25GHz Test Setup:

7.3 Conducted RF test setups

Measuring Receiver

EUT

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8 Systems test configuration

Auxiliary Equipment Used during Test:

DESCRIPTION Notebook

MANUFACTURER Lenove

MODEL NO.(SHIELD) E470

S/N(LENGTH) Notebook

Test software: secure CRT, which used to control the EUT in continues transmitting mode

The system was configured to hopping mode and non-hopping mode.

Hopping mode: typical working mode (normal hopping status)

Non-hopping mode: The system was configured to operate at a signal channel transmitting. The test software allows the configuration and operation at the worst-case duty and the highest transmit power

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9 Technical Requirement 9.1 Conducted Emission

Test Method 1. The EUT was placed on a table, which is 0.8m above ground plane 2. The power line of the EUT is connected to the AC mains through a Artificial Mains Network (A.M.N.). 3. Maximum procedure was performed to ensure EUT compliance 4. A EMI test receiver is used to test the emissions from both sides of AC line

Limit

Frequency

QP Limit

AV Limit

MHz

dBV

dBV

0.150-0.500

66-56*

56-46*

0.500-5

56

46

5-30

60

50

Decreasing linearly with logarithm of the frequency

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Conducted Emission

Product Type M/N Operating Condition Test Specification Comment

: Smart Audio Module : VWRK4 : Mode 1: Tx_2441MHz(8DPSK) : L-line : AC 120V/60Hz (powered by notebook)

Level in dBuV

Final_Result

Frequency QuasiPeak

(MHz)

(dBuV)

0.150000 0.150000 0.514500 0.523500 2.107500 2.112000 2.476500 2.683500 5.199000 5.334000 13.632000 13.731000

--45.91
--31.54
--26.48 30.37
----27.11 --30.90

CAverage (dBuV)
26.01 ---
22.99 ---
21.11 -----
24.75 20.85
--25.16
---

Limit (dBuV)
56.00 66.00 46.00 56.00 46.00 56.00 56.00 46.00 50.00 60.00 50.00 60.00

Margin (dB)
29.99 20.09 23.01 24.46 24.89 29.52 25.63 21.25 29.15 32.89 24.84 29.10

Meas. Time (ms)
1000.0 1000.0 1000.0 1000.0 1000.0 1000.0 1000.0 1000.0 1000.0 1000.0 1000.0 1000.0

Bandwidth Line (kHz)
9.000 L1 9.000 L1 9.000 L1 9.000 L1 9.000 L1 9.000 L1 9.000 L1 9.000 L1 9.000 L1 9.000 L1 9.000 L1 9.000 L1

Corr. (dB)
19.5 19.5 19.4 19.4 19.5 19.5 19.5 19.5 19.6 19.6 19.7 19.7

Note 1: Measure Level (dBuV/m) = Reading Level (dBuV) + Factor (dB) Factor (dB) = Cable Loss (dB) + LISN Factor (dB) + 10dB Attenuator

EMC_SHA_F_R_02.03E

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Product Type M/N Operating Condition Test Specification Comment

: Smart Audio Module : VWRK4 : Mode 1: 2441MHz(8DPSK) : N-line : AC 120V/60Hz (powered by notebook)

Level in dBuV

Final_Result

Frequency QuasiPeak

(MHz)

(dBuV)

0.159000 0.163500 0.505500 0.519000 2.076000 2.094000 2.445000 3.156000 5.140500 5.284500 13.983000 14.032500

--38.46
--32.51 29.18
----27.66 26.11 ----30.63

CAverage (dBuV)
24.93 ---
24.07 -----
24.31 26.10
----19.65 25.56 ---

Limit (dBuV)
55.52 65.28 46.00 56.00 56.00 46.00 46.00 56.00 60.00 50.00 50.00 60.00

Margin (dB)
30.59 26.82 21.93 23.49 26.82 21.69 19.90 28.34 33.89 30.35 24.44 29.37

Meas. Time (ms)
1000.0 1000.0 1000.0 1000.0 1000.0 1000.0 1000.0 1000.0 1000.0 1000.0 1000.0 1000.0

Bandwidth Line (kHz)
9.000 N 9.000 N 9.000 N 9.000 N 9.000 N 9.000 N 9.000 N 9.000 N 9.000 N 9.000 N 9.000 N 9.000 N

Corr. (dB)
19.6 19.6 19.5 19.5 19.6 19.6 19.6 19.6 19.7 19.7 19.7 19.7

Note 1: Measure Level (dBuV/m) = Reading Level (dBuV) + Factor (dB) Factor (dB) = Cable Loss (dB) + LISN Factor (dB) + 10dB Attenuator

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9.2 Conducted peak output power

Test Method 1. 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, VBWRBW, Sweep = auto, Detector function = peak, Trace = max hold 2. Add a correction factor to the display. 3. Allow the trace to stabilize. Use the marker-to-peak function to set the marker to the peak of the emission. The indicated level is the peak output power

Limits

Frequency Range MHz
2400-2483.5

Limit W 1

Limit dBm 30

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Conducted peak output power

Bluetooth Mode GFSK modulation Test Result

Conducted Peak

Frequency

Output Power

Result

MHz

dBm

Low channel 2402MHz

7.83

Pass

Middle channel 2441MHz

7.58

Pass

High channel 2480MHz

7.19

Pass

Bluetooth Mode /4-DQPSK modulation Test Result

Conducted Peak

Frequency

Output Power

Result

MHz

dBm

Low channel 2402MHz

7.40

Pass

Middle channel 2441MHz

7.03

Pass

High channel 2480MHz

6.67

Pass

Bluetooth Mode 8DPSK modulation Test Result

Conducted Peak

Frequency

Output Power

Result

MHz

dBm

Low channel 2402MHz

7.79

Pass

Middle channel 2441MHz

8.24

Pass

High channel 2480MHz

7.15

Pass

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GFSK
Peak output power Channel 0 (2402MHz)

Channel 39 (2441MHz)

Channel 78 (2480MHz)

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/4-DQPSK
Peak output power Channel 0 (2402MHz)

Channel 39 (2441MHz)

Channel 78 (2480MHz)

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8DPSK
Peak output power Channel 0 (2402MHz)

Channel 39 (2441MHz)

Channel 78 (2480MHz)

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9.3 20 dB bandwidth
Test Method 1. Check the calibration of the measuring instrument using either an internal calibrator or a known signal from an external generator. 2. Position the EUT without connection to measurement instrument. Turn on the EUT and connect it to measurement instrument. Then set it to any one convenient frequency within its operating range. Set a reference level on the measuring instrument equal to the highest peak value. 3. Measure the frequency difference of two frequencies that were attenuated 20 dB from the reference level. Record the frequency difference as the emission bandwidth. 4. Repeat above procedures until all frequencies measured were complete.
Limit
Limit [kHz]
N/A

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20 dB bandwidth

Bluetooth Mode GFSK Modulation test result

Frequency MHz 2402 2441 2480

20 dB Bandwidth kHz 1110 1110 1110

Limit kHz
----

Low channel 2402MHz

Result
Pass Pass Pass

Mid channel 2441MHz

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Report Number: 708882003265-00 High channel 2480MHz

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20 dB bandwidth Bandwidth

Bluetooth Mode /4-DQPSK Modulation test result

Frequency MHz 2402 2441 2480

20 dB Bandwidth kHz 1392 1389 1389

Limit kHz
----

Low channel 2402MHz

Result
Pass Pass Pass

Mid channel 2441MHz

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Report Number: 708882003265-00 High channel 2480MHz

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20 dB bandwidth Bandwidth

Bluetooth Mode 8DPSK Modulation test result

Frequency MHz 2402 2441 2480

20 dB Bandwidth kHz 1377 1377 1374

Limit kHz
----

Low channel 2402MHz

Result
Pass Pass Pass

Mid channel 2441MHz

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Report Number: 708882003265-00 High channel 2480MHz

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9.4 Carrier Frequency Separation
Test Method 1. Use the following spectrum analyzer settings: Span = wide enough to capture the peaks of two adjacent channels, RBW  1% of the span, VBW) RBW, Sweep = auto, Detector function = peak 2. By using the Max-Hold function record the separation of two adjacent channels. 3. Measure the frequency difference of these two adjacent channels by spectrum analyzer marker function. 4. Repeat above procedures until all frequencies measured were complete.
Limit
Limit kHz 25KHz or 2/3 of the 20 dB bandwidth which is greater

Limit

Frequency MHz 2402 2441 2402

2/3 of 20 dB Bandwidth kHz
740 (GFSK) 928(/4-DQPSK)
918(8DPSK)

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Carrier Frequency Separation

Test result: The measurement was performed with the typical configuration (normal hopping status), here GFSK modulation mode was used to show compliance.

test result

Modulation
GFSK /4-DQPSK
8DPSK

Frequency MHz 2441 2441 2441

Carrier Frequency Separation kHz
1005.8 1002.9 1101.4

Result
Pass Pass Pass

GFSK

/4-DQPSK

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8DPSK

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9.5 Number of hopping frequencies
Test Method 1. Use the following spectrum analyzer settings: Span = wide enough to capture the peaks of two adjacent channels, RBW  1% of the span, VBW) RBW, Sweep = auto, Detector function = peak 2. Set the spectrum analyzer on Max-Hold Mode, and then keep the EUT in hopping mode. 3. Record all the signals from each channel until each one has been recorded. 4. Repeat above procedures until all frequencies measured were complete.
Limit
Limit number
 15

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Number of hopping frequencies

Test result: The measurement was performed with the typical configuration (normal hopping status), and the total hopping channels is constant for the all modulation mode according with the Bluetooth Core Specification. Here GFSK modulation mode was used to show compliance.

Number of hopping frequencies 79
GFSK

Result Pass

/4-DQPSK Mode

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Report Number: 708882003265-00

8DPSK Mode

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Report Number: 708882003265-00
9.6 Dwell Time
Test Method 1. Connect EUT antenna terminal to the spectrum analyzer with a low loss cable. Equipment mode: Spectrum analyzer 2. RBW: 1MHz; VBW: 1MHz; SPAN: Zero Span 3. Adjust the center frequency of spectrum analyzer on any frequency be measured. 4. Measure the Dwell Time by spectrum analyzer Marker function. 5. Repeat above procedures until all frequencies measured were complete.
Limit The average time of occupancy on any frequency shall not be greater than 0.4 seconds within a period of 0.4 seconds multiplied by the number of hopping channels employed.

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Dwell Time

The maximum dwell time shall be 0,4 s. According to the Bluetooth Core Specification, the worse result (DH5 mode) was reported to show compliance.

The Dwell Time = Burst Width * Total Hops. The detailed calculations are showed as follows: The duration for dwell time calculation: 0.4 [s] * hopping number = 0.4 [s] * 79 [ch] = 31.6 [s*ch];
The burst width, which is directly measured, refers to the duration on one channel hop.
The maximum number of hopping channels in 31.6s for DH5=1600 / 6 / 79 *31.6=106.67

Test Result

Modulation
GFSK /4-DQPSK
8-DPSK

Mode
DH5 2DH5 3DH5

Reading (ms) 2.87 2.87 2.87

Total Hops
106.67 106.67 106.67

Test Result (ms)
306.14 306.14 306.14

Limit (ms) < 400 < 400 < 400

Result
Pass Pass Pass

GFSK Modulation

DH5

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Report Number: 708882003265-00
/4-DQPSK Modulation

2DH5

8-DPSK Modulation

3DH5

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Report Number: 708882003265-00

9.7 Spurious RF conducted emissions

Test Method 1. 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, VBWRBW, Sweep = auto, Detector function = peak, Trace = max hold 2. Allow the trace to stabilize. Set the marker on the peak of any spurious emission recorded. 3. The level displayed must comply with the limit specified in this Section. Submit these plots. 4. Repeat above procedures until all frequencies measured were complete.

Limit

Frequency Range MHz
30-25000

Limit (dBc) -20

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Spurious RF conducted emissions

Only the worst case (which is subject to the maximum EIRP, 8DPSK mode) test result is listed in the report.

Test Mode Antenna Channel 2402

3DH5

Ant1

2441

2480

FreqRange [MHz]
Reference 30~1000 1000~5000 5000~26500 Reference 30~1000 1000~5000 5000~26500 Reference 30~1000 1000~5000 5000~26500

RefLevel [dBm] 6.43
30~1000 1000~5000 5000~26500
6.04 30~1000 1000~5000 5000~26500
5.59 30~1000 1000~5000 5000~26500

Result [dBm] 6.43 -57.06 -55.81 -52.58 6.04 -55.42 -55.18 -51.98 5.59 -57.71 -55.62 -52.17

Limit [dBm]
--<=-13.57 <=-13.57 <=-13.57
--<=-13.96 <=-13.96 <=-13.96
--<=-14.41 <=-14.41 <=-14.41

Verdict
PASS PASS PASS PASS PASS PASS PASS PASS PASS PASS PASS PASS

3DH5_Ant1_2402_0~Reference

3DH5_Ant1_2402_30~1000

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Report Number: 708882003265-00 3DH5_Ant1_2402_1000~5000
3DH5_Ant1_2402_5000~26500
3DH5_Ant1_2441_0~Reference

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Report Number: 708882003265-00 3DH5_Ant1_2441_30~1000
3DH5_Ant1_2441_1000~5000

3DH5_Ant1_2441_5000~26500

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Report Number: 708882003265-00 3DH5_Ant1_2480_0~Reference
3DH5_Ant1_2480_30~1000
3DH5_Ant1_2480_1000~5000

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Report Number: 708882003265-00 3DH5_Ant1_2480_5000~26500

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Report Number: 708882003265-00
9.8 Band edge testing
Test Method 1. The RF output of EUT was connected to the spectrum analyzer by RF cable. The path loss was compensated to the results for each measurement. 2. Set to the maximum power setting and enable the EUT transmit continuously. 3. Set RBW = 100 kHz, VBW=300 kHz, Peak Detector. Unwanted Emissions measured in any 100 kHz bandwidth outside of the authorized frequency band shall be attenuated by at least 20 dB relative to the maximum in-band peak PSD level in 100 kHz when maximum peak conducted output power procedure is used. If the transmitter complies with the conducted power limits based on the use of RMS averaging over a time interval, the attenuation required under this paragraph shall be 30 dB instead of 20 dB. 4. Measure and record the results in the test report. 5. The RF fundamental frequency should be excluded against the limit line in the operating frequency 6. Set to the maximum power setting and enable the EUT hopping mode, repeat the test.
Limit: In any 100kHz bandwidth outside the frequency band in which the spread spectrum or digitally modulated device is operating, the RF power that is produced shall be at least 20 dB below that in the100 kHz bandwidth within the band that contains the highest level of the desired power, based on either an RF conducted or a radiated measurement, provided that the transmitter demonstrates compliance with the peak conducted power limits.

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Report Number: 708882003265-00
Band edge testing GFSK Modulation Test Result: Hopping off mode:

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Report Number: 708882003265-00
Hopping on mode:

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Report Number: 708882003265-00
/4-DQPSK Modulation Test Result: Hopping off mode:

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Report Number: 708882003265-00
Hopping on mode:

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Report Number: 708882003265-00
8DPSK Modulation Test Result: Hopping off mode:

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Report Number: 708882003265-00
Hopping on mode:

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Report Number: 708882003265-00

9.9 Spurious radiated emissions for transmitter and receiver
Test Method 1. The EUT was place on a turn table which is 1.5m above ground plane for above 1GHz and 0.8m above ground for below 1GHz at 3 meter chamber room for test. 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 height of antenna 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 rotatable table was turned from 0 degrees to 360 degrees to find the maximum reading. 5. Use the following spectrum analyzer settings According to C63.10: For Below 1GHz Use the following spectrum analyzer settings: Span = wide enough to capture the peak level of the in-band emission and all spurious RBW = 100 kHz to 120 kHz, VBWRBW for peak measurement, Sweep = auto, Detector function = peak, Trace = max hold.
For Peak unwanted emissions Above 1GHz: Span = wide enough to capture the peak level of the in-band emission and all spurious RBW = 1MHz, VBWRBW for peak measurement, Sweep = auto, Detector function = peak, Trace = max hold.
Procedures for average unwanted emissions measurements above 1000 MHz a) RBW = 1MHz. b) VBW  [3 × RBW]. c) Detector = RMS (power averaging), if [span / (# of points in sweep)]  RBW / 2. Satisfying this condition can require increasing the number of points in the sweep or reducing the span. If the condition is not satisfied, then the detector mode shall be set to peak. d) Averaging type = power (i.e., rms) (As an alternative, the detector and averaging type may be set for linear voltage averaging. Some instruments require linear display mode to use linear voltage averaging. Log or dB averaging shall not be used.) e) Sweep time = auto. f) Perform a trace average of at least 100 traces if the transmission is continuous. If the transmission is not continuous, then the number of traces shall be increased by a factor of 1 / D, where D is the duty cycle. For example, with 50% duty cycle, at least 200 traces shall be averaged. (If a specific emission is demonstrated to be continuous--i.e., 100% duty cycle--then rather than turning ON and OFF with the transmit cycle, at least 100 traces shall be averaged.) g) If tests are performed with the EUT transmitting at a duty cycle less than 98%, then a correction factor shall be added to the measurement results prior to comparing with the

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Report Number: 708882003265-00

emission limit, to compute the emission level that would have been measured had the test been performed at 100% duty cycle. The correction factor is computed as follows: 1) If power averaging (rms) mode was used in the preceding step e), then the correction factor is [10 log (1 / D)], where D is the duty cycle. For example, if the transmit duty cycle was 50%, then 3 dB shall be added to the measured emission levels. 2) If linear voltage averaging mode was used in the preceding step e), then the correction factor is [20 log (1 / D)], where D is the duty cycle. For example, if the transmit duty cycle was 50%, then 6 dB shall be added to the measured emission levels. 3) If a specific emission is demonstrated to be continuous (100% duty cycle) rather than turning ON and OFF with the transmit cycle, then no duty cycle correction is required for that emission.

Limit

The radio emission outside the operating frequency band 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. Radiated emissions which fall in the restricted bands, as defined in section15.205, must comply with the radiated emission limits specified in section 15.209.

Frequency MHz
0.009~0.490 0.490~1.705
1.705~30

Field Strength uV/m
2400/F (kHz) 24000/F (kHz)
30

Measured Distance Meters
300 30 30

Frequency MHz 30-88
88-216 216-960 960-1000 Above 1000 Above 1000

Field Strength uV/m 100 150 200 500 500 5000

Field Strength dBV/m 40 43.5 46 54 54 74

Detector
QP QP QP QP AV PK

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Spurious radiated emissions for transmitter and receiver

According to C63.10, if the peak (or quasi-peak) measured value complies with the average limit, it is unnecessary to perform an average measurement, so AV emission value did not show in below table if the peak value complies with average limit.

Pre-scan with three orthogonal axis and worst case as X axis. The only worse case (which is subject to the maximum EIRP, 8DPSK mode) test result is listed in the report.

Transmitting spurious emission test result as below:

Bluetooth Mode 8DPSK Modulation 2402MHz Test Result

Frequency
MHz 2385.5 4804.7 2384.4 4804.7

Emission Level
dBuV/m 43.5 40.2 42.7 41.5

Polarization
Horizontal Horizontal
Vertical Vertical

Limit
dBV/m 74.0 74.0 74.0 74.0

Detector
PK PK PK PK

Margin
dBuV/m 30.5 33.8 31.3 32.5

Result
Pass Pass Pass Pass

Bluetooth Mode 8DPSK Modulation 2441MHz Test Result

Frequency
MHz 4882.0 4882.0

Emission Level
dBuV/m 41.1 40.8

Polarization
Horizontal Vertical

Limit
dBV/m 74.0 74.0

Detector
PK PK

Margin
dBuV/m 32.9 33.2

Result
Pass Pass

Bluetooth Mode 8DPSK Modulation 2480MHz Test Result

Frequency
MHz 2483.5 4959.2 2483.5 4959.8

Emission Level
dBuV/m 44.4 40.2 44.1 40.1

Polarization
Horizontal Horizontal
Vertical Vertical

Limit
dBV/m 74.0 74.0 74.0 74.0

Detector
PK PK PK PK

Margin
dBuV/m 29.6 33.8 29.9 33.9

Result
Pass Pass Pass Pass

Remark: (1) Emission level= Original Receiver Reading + Correct Factor (2) Correct Factor = Antenna Factor + Cable Loss -Amplifier gain (3) Margin = limit ­ Corrected Reading

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The worst case of Radiated Emission below 1GHz:

Site: 3 meter chamber

Time: 2020/06/15 - 14:23

Limit: FCC_Part15.209_RE(3m)_ClassB

Engineer: Jiaxi XU

Probe: VULB9168

Polarity: Horizontal

EUT: Smart Audio Module, Model no: VWRK4

Power: 120VAC, 60Hz

Note: Transmit by at channel 2441MHz. (8DPSK)

Note: Pre-scan with three orthogonal axis and worst case as X axis

Level in dBuV/m

Limit and Margin

Frequency (MHz)

QuasiPeak (dBuV/m)

Meas. Time (ms)

Bandwidth (kHz)

Height Pol (cm)

Azimuth (deg)

Corr. (dB)

120.000000

28.7 1000.0

120.000 100.1 H

359.0 13.5

168.040000

30.4 1000.0

120.000 100.1 H

359.0 14.9

191.440000

31.3 1000.0

120.000 100.1 H

359.0 12.2

215.960000

29.4 1000.0

120.000 100.1 H

359.0 12.3

300.000000

32.5 1000.0

120.000 100.1 H

359.0 15.0

359.960000

33.5 1000.0

120.000 100.1 H

359.0 16.5

Margin QPK (dB)
14.8 13.1 12.2 14.1 13.5 12.5

Limit QPK (dBuV/m)
43.5 43.5 43.5 43.5 46.0 46.0

Note 1: Measure Level (dBuV/m) = Reading Level (dBuV) + Factor (dB) Factor (dB) = Cable Loss (dB) + Antenna Factor (dB/m) Note 2: The test trace is same as the ambient noise and the amplitude of the emissions are attenuated more than 20dB below the permissible (the test frequency range: 9kHz ~ 30MHz, 18GHz ~ 25GHz), therefore no data appear in the report.

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Report Number: 708882003265-00

The worst case of Radiated Emission below 1GHz:

Site: 3 meter chamber

Time: 2020/06/15 - 14:43

Limit: FCC_Part15.209_RE(3m)_ClassB

Engineer: Jiaxi XU

Probe: VULB9168

Polarity: Verticall

EUT: Smart Audio Module, Model no: VWRK4

Power: 120VAC, 60Hz

Note: Transmit by at channel 2441MHz. (8DPSK)

Note: Pre-scan with three orthogonal axis and worst case as X axis

Level in dBuV/m

Note 1: Measure Level (dBuV/m) = Reading Level (dBuV) + Factor (dB) Factor (dB) = Cable Loss (dB) + Antenna Factor (dB/m) Note 2: The test trace is same as the ambient noise and the amplitude of the emissions are attenuated more than 20dB below the permissible (the test frequency range: 9kHz ~ 30MHz, 18GHz ~ 25GHz), therefore no data appear in the report.

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Report Number: 708882003265-00

10 Test Equipment List

DESCRIPTION

C

Signal Analyzer

EMI Test Receiver

Signal Analyzer

Trilog Super

Broadband Test

Antenna

Horn Antenna

Pre-amplifier

RE

Loop antenna

DOUBLE-RIDGED

WAVEGUIDE

HORN WITH

PRE-AMPLIFIER

(18 GHZ - 40

GHZ)

3m Semi-anechoic

chamber

EMI Test Receiver

CE

LISN

Test Item RE CE

Software EMC 32 EMC 32

List of Test Instruments
Test Site1

MANUFACTURER

MODEL NO.

SERIAL NO.

CAL. DATE

Rohde & Schwarz
Rohde & Schwarz Rohde & Schwarz

FSV40
ESR3 FSV40

101091
101906 101091

2019-8-5
2019-8-5 2019-8-5

Schwarzbeck

VULB 9168

961

2019-3-16

Rohde & Schwarz Rohde & Schwarz Rohde & Schwarz

HF907 SCU-18D HFH2-Z2

102393 19006451
100443

2018-6-11 2019-8-5 2020-3-14

ETS-Lindgren

3116C-PA 002222727 2018-1-29

TDK
Rohde & Schwarz Rohde & Schwarz

9X6X6
ESR3 ENV216

----
101907 101924

2018-5-11
2019-8-5 2019-8-5

Measurement Software Information Manufacturer Rohde & Schwarz Rohde & Schwarz

Version V9.15.00 V9.15.03

CAL. DUE DATE
2020-8-4 2020-8-4 2020-8-4
2022-3-15
2021-4-1 2020-8-4 2021-3-13
2021-1-28
2021-5-10 2020-8-4 2020-8-4

C - Conducted RF tests · Conducted peak output power · 6dB bandwidth · 20dB bandwidth and 99% Occupied Bandwidth · Carrier frequency separation · Number of hopping frequencies · Dwell Time · Power spectral density* · Spurious RF conducted emissions · Band edge

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Report Number: 708882003265-00

11 System Measurement Uncertainty
For a 95% confidence level, the measurement expanded uncertainties for defined systems, in accordance with the recommendations of ISO 17025 were:

Items
Conducted Disturbance at Mains Terminals Radiated Disturbance
Carrier power conducted measurement Spurious Emission Conducted Measurement

Extended Uncertainty
150kHz to 30MHz, LISN, ±3.16dB
30MHz to 1GHz, ±5.03dB (Horizontal) ±5.12dB (Vertical)
1GHz to 18GHz, ±5.49dB 18GHz to 25GHz, ±5.63dB
50MHz~18GHz, ±1.238dB
9kHz ~40GHz, ±1.224dB

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Report Number: 708882003265-00
12 Photographs of Test Set-ups
Refer to the < Test Setup photos >.

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Report Number: 708882003265-00
13 Photographs of EUT
Refer to the < External Photos > & < Internal Photos >. THE END

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