Test Report_DFS

FCC ID: 2AFZZC3XG

Test Report

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FCCID_4483096

                           Test Report No.: RF190828N005-1



                                                                 TEST REPORT
         Applicant                       Xiaomi Communications Co., Ltd.
                                         The Rainbow City of China Resources, NO.68, Qinghe Middle Street, Haidian
         Address
                                         District, Beijing, China


          Manufacturer or
                                         Xiaomi Communications Co., Ltd.
          Supplier
                                         The Rainbow City of China Resources, NO.68, Qinghe Middle Street, Haidian
          Address
                                         District, Beijing, China
          Product Name                   Mobile Phone

          Brand Name                     Redmi

          Model                          M1908C3XG

          Additional Model &
                                         N/A
          Model Difference

          FCC ID                         2AFZZC3XG

          Date of tests                  Aug. 28, 2019 ~ Sep. 24, 2019

          the tests have been carried out according to the requirements of the following standard:

               FCC Part 15, Subpart E, Section 15.407
               FCC 06-96
               KDB 905462 D02 UNII DFS Compliance Procedures New Rules v02
               KDB 905462 D03 UNII Clients Without Radar Detection New Rules v01r02

          CONCLUSION: The submitted sample was found to COMPLY with the test requirement

                            Tested by Andy Zhu                                                           Approved by Glyn He
                    Project Engineer / EMC Department                                            Assistant Manager / EMC Department




                                                                                                               Date: Sep. 26, 2019
          This report is governed by, and incorporates by reference, CPS Conditions of Service as posted at the date of issuance of this report at
          http://www.bureauveritas.com/home/about-us/our-business/cps/about-us/terms-conditions/and is intended for your exclusive use. Any copying or
          replication of this report to or for any other person or entity, or use of our name or trademark, is permitted only with our prior written permission.
          This report sets forth our findings solely with respect to the test samples identified herein. The results set forth in this report are not indicative or
          representative of the quality or characteristics of the lot from which a test sample was taken or any similar or identical product unless specifically
          and expressly noted. Our report includes all of the tests requested by you and the results thereof based upon the information that you provided to
          us. Measurement uncertainty is only provided upon request for accredited tests. You have 60 days from date of issuance of this report to notify us
          of any material error or omission caused by our negligence or if you require measurement uncertainty; provided, however, that such notice shall
          be in writing and shall specifically address the issue you wish to raise. A failure to raise such issue within the prescribed time shall constitute you
          unqualified acceptance of the completeness of this report, the tests conducted and the correctness of the report contents.


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                           Test Report No.: RF190828N005-1


                                                    TABLE OF CONTENTS
          RELEASE CONTROL RECORD ............................................................................................................ 3

          1       EUT INFORMATION....................................................................................................................... 4

              1.1     OPERATING FREQUENCY BANDS AND MODE OF EUT ....................................................... 4
              1.2     EUT SOFTWARE AND FIRMWARE VERSION ......................................................................... 4
              1.3     DESCRIPTION OF AVAILABLE ANTENNAS TO THE EUT ...................................................... 4
              1.4     TRANSMIT POWER CONTROL (TPC) ..................................................................................... 5
              1.5     STATEMENT OF MAUNFACTURER ......................................................................................... 5

          2       U-NII DFS RULE REQUIREMENTS .............................................................................................. 6

              2.1     WORKING MODES AND REQUIRED TEST ITEMS ................................................................. 6
              2.2     TEST LIMITS AND RADAR SIGNAL PARAMETERS ................................................................ 7

          3       TEST & SUPPORT EQUIPMENT LIST ....................................................................................... 10

              3.1     TEST INSTRUMENTS ............................................................................................................. 10
              3.2     DESCRIPTION OF SUPPORT UNITS ..................................................................................... 10

          4       TEST PROCEDURE ......................................................................................................................11

              4.1     BVADT DFS MEASUREMENT SYSTEM: .................................................................................11
              4.2     CALIBRATION OF DFS DETECTION THRESHOLD LEVEL: ................................................. 12
              4.3     DEVIATION FROM TEST STANDARD .................................................................................... 13
              4.4     CONDUCTED TEST SETUP CONFIGURATION .................................................................... 13
                  4.4.1       CLIENT WITHOUT RADAR DETECTION MODE ........................................................... 13

          5       TEST RESULTS ........................................................................................................................... 14

              5.1     SUMMARY OF TEST RESULTS .............................................................................................. 14
              5.2     DETAILED TEST RESULTS ..................................................................................................... 14
                  5.2.1       TEST MODE: DEVICE OPERATING IN CLIENT WITHOUT RADAR DETECTION MODE
                              14
                  5.2.2       DFS DETECTION THRESHOLD ..................................................................................... 15
                  5.2.3       CHANNEL LOADING ....................................................................................................... 16
                  5.2.4       CHANNEL CLOSING TRANSMISSION AND CHANNEL MOVE TIME .......................... 17
                  5.2.5       NON- OCCUPANCY PERIOD ......................................................................................... 18
                  5.2.6       NON-ASSOCIATED TEST............................................................................................... 20
                  5.2.7       NON- CO-CHANNEL TEST ............................................................................................. 20

          6       APPENDIX A - MODIFICATIONS RECORDERS FOR ENGINEERING CHANGES TO THE EUT
          BY THE LAB ......................................................................................................................................... 21

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                       Test Report No.: RF190828N005-1




                                       RELEASE CONTROL RECORD

           ISSUE NO.                REASON FOR CHANGE                                                          DATE ISSUED

           RF190828N005-1           Original release.                                                           Sep. 26, 2019




                                              No. 34, Chenwulu Section, Guantai Rd., Houjie   Tel: +86 769 8998 2098
Bureau Veritas Shenzhen Co., Ltd.
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                       Test Report No.: RF190828N005-1


          1        EUT INFORMATION

          1.1       OPERATING FREQUENCY BANDS AND MODE OF EUT


           OPERATING FREQUENCY BANDS AND MODE OF EUT
                                                                 OPERATING FREQUENCY RANGE
                    OPERATIONAL MODE
                                                           5250~5350MHz                          5470~5725MHz
           Client without radar detection and
                                                                    V                                        V
                     ad hoc function




          1.2       EUT SOFTWARE AND FIRMWARE VERSION


           THE EUT SOFTWARE/FIRMWARE VERSION

              NO.              PRODUCT                    MODEL NO.              SOFTWARE/FIRMWARE VERSION

               1               Mobile Phone                M1908C3XG                              MIUI 10/P2




          1.3       DESCRIPTION OF AVAILABLE ANTENNAS TO THE EUT


           ANTENNA LIST
                                                                         FREQUENCY
                                          CONNECTO          ANT                                 NET                CABLE
           ANT.      BRAND      MODEL                                      RANGE
                                           R TYPE          TYPE                               GAIN(dBi)           LOSS(dBi)
                                                                        (MHZ TO MHZ)
                                                          Fixed           5250 - 5350               -2                   0
              1        N/A          N/A       N/A        Internal
                                                         Antenna          5470 - 5725             -1.14                  0




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                       Test Report No.: RF190828N005-1


          1.4 TRANSMIT POWER CONTROL (TPC)
          U-NII devices operating in the 5.25-5.35 GHz band and the 5.47-5.725 GHz band
          shall employ a TPC mechanism. The U-NII device is required to have the capability
          to operate at least 6 dB below the mean EIRP value of 30 dBm. A TPC mechanism is
          not required for systems with an EIRP of less than 500 mW.

          Maximum EIRP of this device is less than 500mW which less than 500mW, therefore
          it’s not require TPC function.




          1.5 STATEMENT OF MAUNFACTURER
          This device (Client) is without radar detection, then the manufacturer statement
          confirming that information regarding the parameters of the detected Radar
          Waveforms is not available to the end user. And the device doesn’t have Ad Hoc
          mode on DFS frequency band.




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                       Test Report No.: RF190828N005-1


          2     U-NII DFS RULE REQUIREMENTS

          2.1     WORKING MODES AND REQUIRED TEST ITEMS

          The manufacturer shall state whether the UUT is capable of operating as a Master
          and/or a Client. If the UUT is capable of operating in more than one operating mode
          then each operating mode shall be tested separately. See the applicability of DFS
          requirements for each of the operational modes.

                      APPLICABILITY OF DFS REQUIREMENTS PRIOR TO USE A CHANNEL
                                                                        OPERATIONAL MODE
                     REQUIREMENT                                        CLIENT WITHOUT                 CLIENT WITH
                                                      MASTER                RADAR                        RADAR
                                                                          DETECTION                    DETECTION
                  Non-Occupancy Period
                 DFS Detection Threshold                                    Not required
              Channel Availability Check Time                               Not required                 Not required
                    Uniform Spreading                                       Not required                 Not required
                U-NII Detection Bandwidth                                   Not required


                    APPLICABILITY OF DFS REQUIREMENTS DURING NORMAL OPERATION
                                                                        OPERATIONAL MODE
                     REQUIREMENT                                        CLIENT WITHOUT                 CLIENT WITH
                                                      MASTER                RADAR                        RADAR
                                                                          DETECTION                    DETECTION
                 DFS Detection Threshold                                    Not required
          Channel Closing Transmission Time
                   Channel Move Time
                U-NII Detection Bandwidth                                   Not required




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                       Test Report No.: RF190828N005-1


          2.2    TEST LIMITS AND RADAR SIGNAL PARAMETERS

                 DETECTION THRESHOLD VALUES

            DFS DETECTION THRESHOLDS FOR MASTER DEVICES AND CLIENT DEVICES WITH
                                    RADAR DETECTION

                   MAXIMUM TRANSMIT POWER                                    VALUE (SEE Note 1 and 2)

                             ≥ 200 milliwatt                                               -64 dBm
                             < 200 milliwatt                                               -62 dBm
          Note 1: This is the level at the input of the receiver assuming a 0 dBi receive antenna.
          Note 2: Throughout these test procedures an additional 1 dB has been added to the amplitude
          of the test transmission waveforms to account for variations in measurement equipment. This
          will ensure that the test signal is at or above the detection threshold level to trigger a DFS
          response.


           DFS RESPONSE REQUIREMENT VALUES

                             PARAMETER                                                     VALUE
          Non-occupancy period                                   Minimum 30 minutes
          Channel Availability Check Time                        60 seconds
          Channel Move Time                                      10 seconds
                                                                 See Note 1.
          Channel Closing Transmission Time                      200 milliseconds + an aggregate of 60
                                                                 milliseconds over remaining 10 second period.
                                                                 See Notes 1 and 2.
          U-NII Detection Bandwidth                              100% of the UNII transmission power bandwidth.
                                                                 See Note 3.
          Note 1: The instant that the Channel Move Time and the Channel Closing Transmission Time
          begins is as follows:
          • For the Short Pulse Radar Test Signals this instant is the end of the Burst.
          • For the Frequency Hopping radar Test Signal, this instant is the end of the last radar
          Burst generated.
          • For the Long Pulse Radar Test Signal this instant is the end of the 12 second period defining
          the Radar Waveform.
          Note 2: The Channel Closing Transmission Time is comprised of 200 milliseconds starting at
          the beginning of the Channel Move Time plus any additional intermittent control signals
          required to facilitate a Channel move (an aggregate of 60 milliseconds) during the remainder of
          the 10 second period. The aggregate duration of control signals will not count quiet periods in
          between transmissions.
          Note 3: During the U-NII Detection Bandwidth detection test, radar type 1 is used and for each
          frequency step the minimum percentage of detection is 90 percent. Measurements are
          performed with no data traffic.

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                       Test Report No.: RF190828N005-1



          PARAMETERS OF DFS TEST SIGNALS
          Step intervals of 0.1 microsecond for Pulse Width, 1 microsecond for PRI, 1 MHz for chirp
          width and 1 for the number of pulses will be utilized for the random determination of specific
          test waveforms.

           Short Pulse Radar Test Waveforms
                                                                                     Minimum
                          Pulse                                                     Percentage                Minimum
            Radar                           PRI                  Number
                          Width                                                         of                    Number of
            Type                           (µsec)               of Pulses
                          (µsec)                                                    Successful                  Trials
                                                                                     Detection
               0             1              1428                      18                 See Note 1           See Note 1
               1             1      Test A: 15 unique                                      60%                    30
                                         PRI values
                                    randomly selected
                                    from the list of 23
                                       PRI values in
                                          Table 5a
                                    ------------------------
                                      Test B: 15 unique
                                          PRI values
                                      randomly selected
                                        within the range
                                         of 518-3066
                                         µsec, with a
                                          minimum
                                      increment of 1
                                            µsec,
                                        excluding PRI
                                            values
                                         selected in
                                            Test A
               2            1-5          150-230                    23-29                  60%                        30
               3           6-10          200-500                    16-18                  60%                        30
               4          11-20          200-500                    12-16                  60%                        30
                            Aggregate (Radar Types 1-4)                                    80%                       120
           Note 1: Short Pulse Radar Type 0 should be used for the detection bandwidth test,
           channel move time, and channel closing time tests.




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                       Test Report No.: RF190828N005-1



           LONG PULSE RADAR TEST WAVEFORM

                                    CHIRP                                         MINIMUM
                       PULSE                     PRI         NUMBER                                                   MINIMUM
           RADAR                                                       NUMBER PERCENTAGE OF
                       WIDTH        WIDTH                   OF PULSES                                                NUMBER OF
            TYPE                               (µsec)                 OF BURSTS SUCCESSFUL
                       (µsec)       (MHz)                   PER BURST                                                  TRIALS
                                                                                 DETECTION

               5       50-100       5-20     1000-2000           1-3           8-20              80%                       30



           FREQUENCY HOPPING RADAR TEST WAVEFORM

                         PULSE                               HOPPING HOPPING     MINIMUM
                                                                                                                      MINIMUM
            RADAR                       PRI     PULSES        RATE   SEQUENCE PERCENTAGE OF
                         WIDTH                                                                                       NUMBER OF
             TYPE                     (µsec)    PER HOP               LENGTH   SUCCESSFUL
                         (µsec)                               (kHz)                                                    TRIALS
                                                                      (msec)    DETECTION

               6            1          333           9         0.333           300               70%                       30




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                       Test Report No.: RF190828N005-1


          3 TEST & SUPPORT EQUIPMENT LIST

           3.1     TEST INSTRUMENTS
           TEST INSTRUMENTS LIST.
                 DESCRIPTION &                                                CALIBRATED              CALIBRATED
                                        MODEL NO.             BRAND
                 MANUFACTURER                                                    DATE                    UNTIL
                 Spectrum Analyzer         N9020A           MY55400499           Mar. 21,19               Mar. 20,20
                   R&S Spectrum              FSV7                R&S             Nov 25, 18               Nov 24, 19
            MXG-B RF Vector Signal
                                           N5182B           MY56200288           Jan. 02,19               Jan. 01,20
                     Generator
                  Signal generator          8645A              Agilent           Sep.01, 19               Aug.31, 20




           3.2     DESCRIPTION OF SUPPORT UNITS

           SUPPORT UNIT INFORMATION.
                                                                                                     SOFTWARE/FIR
           NO.       PRODUCT         BRAND          MODEL NO.                  FCC ID                   MWARE
                                                                                                       VERSION


             1     Router AC3200     LINKSYS      WRT-3200ACM            Q87-WRT3200ACM                 1.0.0.174361


          NOTE: This device was functioned as a      Master       Slave device during the DFS test.




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                       Test Report No.: RF190828N005-1



          4 TEST PROCEDURE

           4.1     BVADT DFS MEASUREMENT SYSTEM:
                A complete DFS Measurement System consists of Radar signal generate system to
                generating the radar waveforms. The traffic monitoring system is specified to the type of
                unit under test (UUT).

          Conducted setup configuration of               DFS Measurement System

                                                                                             Radar Signal Generating Subsystem
                                    Control PC




                                    Spectrum
                                    Analyzer                                                              Attenuator




                                      C/S




                   Attenuator                               Attenuator                                       C/S


                                                 Traffic Monitoring Subsystem

                  Client (UUT)                                                                             MASTER
                                                                                                         (Support Unit)




          Channel Loading
          System testing will be performed with channel-loading using means appropriate to the data types that
          are used by the unlicensed device. The following requirements apply:

                   The data file must be of a type that is typical for the device (i.e., MPEG-2,
           a)      MPEG-4, WAV, MP3, MP4, AVI, etc.) and must generally be transmitting in a
                   streaming mode.
                   Software to ping the client is permitted to simulate data transfer but must have
           b)      random ping intervals.
                   Timing plots are required with calculations demonstrating a minimum channel
           c)      loading of approximately 17% or greater.
                   Unicast or Multicast protocols are preferable but other protocols may be used.
           d)      The appropriate protocol used must be described in the test procedures.



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                          Test Report No.: RF190828N005-1


           4.2     CALIBRATION OF DFS DETECTION THRESHOLD LEVEL:

              The measured channel are 5300MHz and 5500 MHz in 20MHz Bandwidth,
              5290MHz and 5530MHz in 80MHz Bandwidth. The radar signal was the same as
              transmitted channels, and injected into the antenna port of AP (master) or Client
              Device with Radar Detection, measured the channel closing transmission time
              and channel move time. The Master maximum transmit power was more than
              200mW. The Master antenna gain is 3dBi and required detection threshold is
              -61dBm (=-64+3)dBm.

          Conducted setup configuration of calibration of DFS detection threshold level:

                                     Control PC




                                     Spectrum                                                        Radar Signal Generating
                                     Analyzer                                                              Subsystem




                                                50Ω Load (Terminator)
                                                                                                        Attenuator


                                                  C/S



             50Ω Load          Attenuator                                                                   C/S
                                                                        Attenuator
           (Terminator)




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                       Test Report No.: RF190828N005-1


           4.3     DEVIATION FROM TEST STANDARD
          No deviation.

           4.4     CONDUCTED TEST SETUP CONFIGURATION


           4.4.1      CLIENT WITHOUT RADAR DETECTION MODE


                                Control PC




                                Spectrum                                                     Radar Signal Generating
                                Analyzer                                                           Subsystem




                                                                                                      Attenuator

                                    C/S




                                                                                                         C/S            Master
                                                       Attenuator




                                     Notebook                                                                          Notebook
                 Client (UUT)




          The UUT is a U-NII Device operating in Client mode without radar detection. The radar test signals are
          injected into the Master Device.




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                       Test Report No.: RF190828N005-1


          5      TEST RESULTS
           5.1      SUMMARY OF TEST RESULTS


                 CLAUSE                    TEST PARAMETER                            REMARKS                  PASS/FAIL


                 15.407             DFS Detection Threshold                        Not Applicable                    N/A

                 15.407             Channel Availability Check Time                Not Applicable                    N/A

                 15.407             Channel Move Time                                Applicable                     Pass

                 15.407             Channel Closing Transmission Time                Applicable                     Pass

                 15.407             Non- Occupancy Period                            Applicable                     Pass

                 15.407             Uniform Spreading                              Not Applicable                    N/A

                 15.407             U-NII Detection Bandwidth                      Not Applicable                    N/A

                 15.407             Non-associated test                              Applicable                     Pass

                 15.407             Non-Co-Channel test                              Applicable                     Pass
           Note: Therefore test procedure were completed by KDB 905462


           5.2      DETAILED TEST RESULTS

              5.2.1     TEST MODE: DEVICE OPERATING IN CLIENT WITHOUT RADAR
                        DETECTION MODE

          The radar test signals are injected into the Master Device.
          This test was investigated for different bandwidth (20MHz, 40MHz and 80MHz ). The
          following plots was done on 80MHz as a representative




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                       Test Report No.: RF190828N005-1



               5.2.2      DFS DETECTION THRESHOLD


          The Required detection threshold is -61.00dBm = -64 +3dBi. The conducted radar
          burst level is set to -61.21dBm.




                                                                              Radar signal




                                                                                 Noise Floor




                                                Radar Signal (Type 0)




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                       Test Report No.: RF190828N005-1



               5.2.3      CHANNEL LOADING

          The measured channel are 5300MHz and 5500 MHz in 20MHz Bandwidth, 5290MHz and 5530MHz in
          80MHz Bandwidth. The radar signal was the same as transmitted channels, and injected into the
          antenna port of AP (master) with radar signal, measured the channel shutdown. The slave transmitted
          the test data to master, the transmitted duty cycle is 18.325%.




          NOTE: T1 denotes the start of duty cycle period is 0th second. T2 denotes the end of duty cycle
          period is 1th second. T2 – T1= 1 seconds. Duty Cycle = 18.325%.


          Note: Traffic signal: from slave transmit to master.




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                       Test Report No.: RF190828N005-1



               5.2.4      CHANNEL CLOSING TRANSMISSION AND CHANNEL MOVE TIME


          Radar Signal 0




          NOTE: T1 denotes the start of Channel Move Time upon the end of the last Radar burst. T2 denotes
          the data transmission time of 200ms from T1. T3 denotes the end of Channel Move Time. T4 denotes
          the 10 second from T1 to observe the aggregate duration of transmissions.




                         Radar Signal




                                               Noise Floor




          NOTE: Zoom in of the first 3000ms after radar signal applied.




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                       Test Report No.: RF190828N005-1



               5.2.5      NON- OCCUPANCY PERIOD

              ASSOCIATED TEST

                 1) Test results demonstrating an associated client link is established with the master on a
                 test frequency.




                 EUT (Client ) links with master on 5290MHz


                 2) The client and DFS-certified master device are associated, and system testing will be
                 performed with channel-loading for a non-occupancy period test.




                 Client performed with channel-loading via master.




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                                                         Page 18 of 21                                                       Report Version 1


                       Test Report No.: RF190828N005-1



           3). The device transmits one type of radar as specified in the DFS Order.




           Radar Signal (Type 0) is used to test during DFS testing.



           4) The test frequency has been monitored to ensure no transmission of any type has occurred for 30
           minutes;
           Note: If the client moves with the master, the device is considered compliant if nothing appears in
           the client non-occupancy period test. For devices that shut down (rather than moving channels), no
           beacons should appear;
           5)An analyzer plot that contains a single 30-minute sweep on the original test frequency.



                                Injected into Radar




                                    Traffic Signal




                                                 No. 34, Chenwulu Section, Guantai Rd., Houjie   Tel: +86 769 8998 2098
Bureau Veritas Shenzhen Co., Ltd.
                                                 Town, Dongguan City,                            Fax: +86 769 8593 1080
Dongguan Branch
                                                 Guangdong 523942, China                         Email: customerservice.dg@cn.bureauveritas.com
                                                                Page 19 of 21                                                       Report Version 1


                       Test Report No.: RF190828N005-1



               5.2.6      NON-ASSOCIATED TEST


          Master was off.
          During the 30 minutes observation time, The UUT did not make any transmissions in
          the DFS band after UUT power up.




               5.2.7      NON- CO-CHANNEL TEST


          The UUT was investigated after radar was detected the channel and made sure no
          co-channel operation with radars.




                                        No. 34, Chenwulu Section, Guantai Rd., Houjie   Tel: +86 769 8998 2098
Bureau Veritas Shenzhen Co., Ltd.
                                        Town, Dongguan City,                            Fax: +86 769 8593 1080
Dongguan Branch
                                        Guangdong 523942, China                         Email: customerservice.dg@cn.bureauveritas.com
                                                       Page 20 of 21                                                       Report Version 1


                       Test Report No.: RF190828N005-1


          6 APPENDIX A - Modifications recorders for engineering changes
          to the EUT BY THE LAB


           No any modifications are made to the EUT by the lab during the test.




           ---END---




                                        No. 34, Chenwulu Section, Guantai Rd., Houjie   Tel: +86 769 8998 2098
Bureau Veritas Shenzhen Co., Ltd.
                                        Town, Dongguan City,                            Fax: +86 769 8593 1080
Dongguan Branch
                                        Guangdong 523942, China                         Email: customerservice.dg@cn.bureauveritas.com
                                                       Page 21 of 21                                                       Report Version 1



Document Created: 2019-10-22 04:57:41
Document Modified: 2019-10-22 04:57:41

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