Radio Test Report ARIB STD-T71 MIC notice 88 Appendix 45

Client Information

Applicant: DOKE COMMUNICATION (HK) LIMITED

Applicant add.: 19H MAXGRAND PLAZA NO 3 TAI YAU STREET SAN PO KONG KL CHINA

Product Information

Product Name: Notebook computer

Model No.: AceBook 8

Serial Model: N/A

Brand Name: Blackview

Prepared By

Dongguan Yaxu (AiT) Technology Limited

No.22, Jinqianling Third Street, Jitigang, Huangjiang, Dongguan, Guangdong, China

Tel.: +86-769-82020499 Fax.: +86-769-82020495

Dates and Results

Date of Receipt: Feb. 18, 2024

Date of Issue: Apr. 10, 2024

Date of Test: Feb. 18, 2024~Apr. 09, 2024

Test Result: Pass

This device has been tested and found to comply with the stated standard(s), indicated in the test report and are applicable only to the tested sample identified in the report.

Note: This report shall not be reproduced except in full, without the written approval of Dongguan Yaxu (AiT) Technology Limited, this document may be altered or revised by Dongguan Yaxu (AiT) Technology Limited, personal only, and shall be noted in the revision of the document. This test report must not be used by the client to claim product endorsement.

Reviewed by: Emiya Lin

Approved by: Simba Huang

1. SUMMARY OF TEST RESULTS

Test procedures according to the technical standards:

1.1 TEST FACILITY

Dongguan Yaxu (AiT) Technology Limited

Add.: No.22, Jinqianling Third Street, Jitigang, Huangjiang, Dongguan, Guangdong, China

IC Registration No.:6819A-1

CNAS Registration No.:L6177

1.2 MEASUREMENT UNCERTAINTY

The reported uncertainty of measurement y ± U, where expended uncertainty U is based on a standard uncertainty multiplied by a coverage factor of k=2, providing a level of confidence of approximately 95 %.

2. GENERAL INFORMATION

2.1 GENERAL DESCRIPTION OF EUT

2.2 DESCRIPTION OF TEST MODES

To investigate the maximum EMI emission characteristics generates from EUT, the test system was pre-scanning tested base on the consideration of following EUT operation mode or test configuration mode which possible have effect on EMI emission level. Each of these EUT operation mode(s) or test configuration mode(s) mentioned above was evaluated respectively.

Note: This device 5GHz and 2.4GHz can not transmit simultaneously.

3. TEST CONDITIONS

The WIFI module was tested while in a continuous transmitter/receiver mode.

Power supply:

The EUT has the input voltage to the circuit of RF unit complies with output voltage limitation (±1%) against input voltage fluctuation (±10%). So, all measurements were conducted at only rated voltage DC 12V.

Diagram: A block diagram illustrating the power supply test setup with points A, C, and RF, showing DC input and DC3V3 output. The text below states: "The fluctuation of C point is under ±1%, when input voltage from A point to the test equipment is fluctuated by ±10%."

Pre-test the EUT in all voltage mode at the DC 13.2V, DC 12V and DC10.8V and conducted to determine the worst-case mode, only the worst-case results (DC 12V) are recorded in this report.

The EUT has the input voltage to the circuit of RF unit complies with output voltage limitation (±1%) against input voltage fluctuation (±10%). So, all measurements were conducted at only rated voltage DC 12V.

Environmental Conditions:

Temperature: 5.0 -35.0 °C

Humidity: 45-85 % RH

Atmospheric Pressure: 1000 -1010 mbar

Parameters of test software setting

During testing channel & power controlling software provided by the manufacturer was used to control the operating channel as well as the output power level.

3.1 BLOCK DIGRAM SHOWING THE CONFIGURATION OF SYSTEM TESTED

Diagram: A block diagram showing a Spectrum Analyzer connected to the EUT.

3.2 DESCRIPTION OF SUPPORT UNITS(CONDUCTED MODE)

The EUT has been tested as an independent unit together with other necessary accessories or support units. The following support units or accessories were used to form a representative test configuration during the tests.

(1) The support equipment was authorized by Declaration of Confirmation.
(2) For detachable type I/O cable should be specified the length in cm in『Length』column.
(3) "YES" is means "shielded" "with core"; "NO" is means "unshielded" "without core".

3.3 EQUIPMENTS LIST FOR ALL TEST ITEMS

Note: Calibration by the calibration agencies listed in the table correspond to paragraph 4 (ii) (c) of Article 24-2 in the Radio Law.

4. RF SHIELDING METHOD

The product applies for Japan RF certification. We use shiled for preventing end- user to access RF parts easily. The shiled can only be opened by forced, which will result in damaging the case.Please refer to following for photo for details.

Diagram: A photograph showing the internal components of a notebook computer, highlighting a shielded section of the motherboard with an arrow pointing to it.

5. FREQUENCY ERROR

5.1 LIMIT

5.2 MEASURING INSTRUMENTS AND SETTING

The following table is the setting of Spectrum Analyzer.

5.3 TEST PROCEDURES

1. In the case of unmodulated signal (continuous or continuous burst), measure the frequency directly by a frequency meter.
2. In the case of burst waves, the measurement shall be done for enough time in order to obtain the enough measuring accuracy, and the average of the measured values becomes the final value.
3. In the case of a test mode with a specific frequency spectrum, measure the frequency of the specific spectrum by a spectrum analyzer.
4. In the cases above, if the frequency equivalent to the test frequency is not directly measured in principle, it shall be obtained by necessary calculation.

In the case of modulated signal, if there is no specific spectrum measurable by a spectrum analyzer but a specific dip is observed, it is allowed to measure the frequency with the signal generator (synthesized). That is, observe a signal of the signal generator concurrently (or alternately) with the tested signal using the spectrum analyzer while setting the frequency of the signal generator to the position of the dip on the screen of the spectrum analyzer, and determine the frequency of the signal generator at the time as a measured value.

5.4 TEST SETUP LAYOUT

Diagram: A test setup layout showing EUT connected to a Dummy load (Attenuator), which is then connected to a Spectrum Analyzer.

5.5 EUT OPERATION DURING TEST

The EUT was placed on the test table and programmed in un-modulation function.

5.6 TEST RESULT:

Please refer to Appendix C.1

NOTE:
1). The nominal frequency shall be confirmed by the applicant and test lab.
2). Worst case data at 6Mbps at IEEE 802.11a; MCS0 at IEEE 802.11n HT20, IEEE 802.11n HT40, IEEE 802.11a VHT20, IEEE 802.11ac VHT40, IEEE 802.11ac VHT80;

Test result: The unit does meet the requirements.

6. OCCUPIED BANDWIDTH MEASUREMENT (99% POWER BANDWIDTH)

6.1 LIMIT

6.2 TEST PROCEDURES

1. Setting of SA is following as: RBW: 300KHz /VBW:300KHz/Sweep Mode: Continuous sweep / Detect mode: Positive peak / Trace mode: Max hold.
2. EUT have transmitted each modulation signal and fixed channelize (For DSSS or OFDM Device). SA set to 99% of occupied bandwidth to measure occupied bandwidth. The limit is less than specific value as section 3.2.1.

6.3 TEST SETUP LAYOUT

Diagram: A test setup layout showing Spectrum Analyzer connected to EUT.

6.4 TEST DEVIATION

There is no deviation with the original standard.

6.5 EUT OPERATION DURING TEST

The EUT was programmed to be in continuously transmitting mode.

6.6 TEST RESULT:

Test result: Please refer to Appendix C.4

NOTE:
1). Worst case data at 6Mbps at IEEE 802.11a; MCS0 at IEEE 802.11n HT20, IEEE 802.11n HT40, IEEE 802.11a VHT20, IEEE 802.11ac VHT40, IEEE 802.11ac VHT80;

Test result: The unit does meet the requirements.

7. SPREAD BANDWIDTH MEASUREMENT

7.1 LIMIT

7.2 MEASURING INSTRUMENTS AND SETTING

TEST PROCEDURES

1. Setting of SA is following as: RBW: 300KHz I VBW: 300KHz / Sweep Mode: Continuous sweep /Detect mode: Positive peak / Trace mode: Max hold.
2. EUT have transmitted each modulation signal and fixed channelize (For DSSS Device) or continuous maximum power of hopping mode (For FHSS Device).
3. SA set to 90% of occupied bandwidth to measure Spread Spectrum Bandwidth and must greater than 500kHz.

7.3 TEST SETUP LAYOUT

Diagram: A test setup layout showing Spectrum Analyzer connected to EUT.

7.4 TEST DEVIATION

There is no deviation with the original standard.

7.5 EUT OPERATION DURING TEST

The EUT was programmed to be in continuously transmitting mode.

7.6 TEST RESULT:

Please refer to Appendix C.5

NOTE:
1). Worst case data at 6Mbps at IEEE 802.11a; MCS0 at IEEE 802.11n HT20, IEEE 802.11n HT40, IEEE 802.11a VHT20, IEEE 802.11ac VHT40, IEEE 802.11ac VHT80;

Test result: The unit does meet the requirements.

8. SPURIOUS EMISSIONS FOR TRANSMITTER MEASUREMENT AND OUT-BAND LEAKAGE POWER

8.1 LIMIT

Article 2-1, Item 19-3 W56:

8.2. TEST PROCEDURES

1. EUT have transmitted the maximum modulation signal and fixed channelize.
2. Setting of SA is following as: Below 1GHz RB:100KHz / VB:100KHz
   Above 1GHz RB:1MHz / VB:1MHz / AT: 10dB Ref: 0dBm / Sweep time: Auto
   Sweep Mode: Continuous sweep / Detect mode: Positive peak
   Trace mode: Max hold
3. Setting of SA is following as 30MHz and stop frequency 1000MHz Then to mark peak reading value + cable loss shall be less than 0.25µW.
4. SA adjusted to start frequency and stop frequency 26GHz .Then to mark peak reading value + cable loss shall be less than 2.5UW/MHZ.
5. If the Result Value is over the requirement, we need to measurement as below steps
6. Span 1~10MHz to find the frequency that have maximum value.
7. Setting of SA is following as: Span: Zero/RBW: 100KHz/VBW: 100KHz under 1GHz,
   Sweep time: Auto / Sweep Mode: Singled sweep / Detect mode: Sample.
8. Calculated the mean power value, add all value of test point and division sample point number.
9. Report the mean power

8.3. TEST SETUP LAYOUT

Diagram: A test setup layout showing Spectrum Analyzer connected to EUT.

8.4. TEST DEVIATION

There is no deviation with the original standard.

8.5. TEST RESULT:

Please refer to Appendix C.6

NOTE:
1). Worst case data at 6Mbps at IEEE 802.11a; MCS0 at IEEE 802.11n HT20, IEEE 802.11n HT40, IEEE 802.11a VHT20, IEEE 802.11ac VHT40, IEEE 802.11ac VHT80;

Test result: The unit does meet the requirements.

9. ADJACENT CHANNEL POWER TOLERANCE

9.1 LIMIT

9.2 TEST PROCEDURES

1. EUT has the continuous reception mode and fixed only one channelize.
2. SA set RBW: 300KHz and VBW: 300KHz, Span 120MHz (BW=20MHz)/240MHz (BW=40MHz) /480MHz (BW=80MHz),RMS Detector, trace Maximum Hold and use ACLR Option.
3. Frequency spacing and measuring bandwidth be specified in section 3.6.1.
4. Reporting the worst value

9.3 TEST SETUP

Diagram: A test setup layout showing Spectrum Analyzer connected to EUT.

9.4 TEST DEVIATION

There is no deviation with the original standard.

9.5 EUT OPERATION DURING TEST

The EUT was programmed to be in continuously transmitting mode.

9.6 TEST RESULT:

Please refer to Appendix C.9

NOTE:
1). Worst case data at 6Mbps at IEEE 802.11a; MCS0 at IEEE 802.11n HT20, IEEE 802.11n HT40, IEEE 802.11a VHT20, IEEE 802.11ac VHT40, IEEE 802.11ac VHT80;

Test result: The unit does meet the requirements.

10. RF OUTPUT POWER / TOLERANCE

10.1 TEST DEVIATION

There is no deviation with the original standard.

10.2 EUT OPERATION DURING TEST

The EUT was programmed to be in continuously transmitting mode.

10.3 TEST PROCEDURES

1. A power meter is connected on the IF output port of the spectrum analyzer.
2. Adjust the spectrum analyzer to have the center frequency the same with the measured carrier. RBW=VBW=1MHz, detector mode is positive peak. Turn off the averaging function and use zero span.
3. The calibrating signal power shall be reduced to 0dBm and it shall be verified that the power meter reading also reduces by 10dB.
4. Connect the equipment to be measured. Using the following settings of the spectrum analyzer in combination with "max hold" function, find the frequency of highest power output in the power envelope: center frequency equal to operating frequency; RBW&VBW:1MHz; detector mode: positive peak; averaging: off; span: 3 times the spectrum width; amplitude: adjust for middle of the instrument's range. The frequency found shall be recorded.
5. Set the center frequency of the spectrum analyzer to the found frequency and switch to zero span. The power meter indicates the measured power density “E”.
6. Remove the EUT and put the replacing standard signal generator (SSG). Set the standard signal generator (SSG) at same frequency and transmit on, then set SSG output power at Pt to give the equivalent output level of "E".
7. Calculate antenna power density by the formula below PD=Pt+10*log(1/x).x:The duty cycle of the EUT in continuously transmitting mode Pt: Output power of the SSG
8. Antenna Power Error is definition that actual measure antenna power tolerance between +20%to-80% power range that base on manufacturer declare the conducted power density.

10.4 TEST SETUP

Diagram: Two test setups are shown. The first shows a Power Meter connected to a Spectrum Analyzer, which is connected to the EUT. The second shows a Power Meter connected to a Spectrum Analyzer, which is connected to a Signal Generator.

10.5 TEST RESULT:

Please refer to Appendix C.2

NOTE:
1). Worst case data at 6Mbps at IEEE 802.11a; MCS0 at IEEE 802.11n HT20, IEEE 802.11n HT40, IEEE 802.11a VHT20, IEEE 802.11ac VHT40, IEEE 802.11ac VHT80;

Test result: The unit does meet the requirements.

11. E.I.R.P MEASUREMENT

11.1 LIMIT

11.2 TEST PROCEDURES

1. A power meter is connected on the IF output port of the spectrum analyzer.
2. Adjust the spectrum analyzer to have the center frequency the same with the measured carrier. RBW=VBW=1MHz, detector mode is positive peak. Turn off the averaging function and use zero span.
3. The calibrating signal power shall be reduced to 0dBm and it shall be verified that the power meter reading also reduces by 10dB.
4. Connect the equipment to be measured. Using the following settings of the spectrum analyzer in combination with "max hold" function, find the frequency of highest power output in the power envelope: center frequency equal to operating frequency; RBW&VBW:1MHz; detector mode: positive peak; averaging: off; span: 3 times the spectrum width; amplitude: adjust for middle of the instrument's range. The frequency found shall be recorded.
5. Set the center frequency of the spectrum analyzer to the found frequency and switch to zero span. The power meter indicates the measured power density "E".
6. Remove the EUT and put the replacing standard signal generator (SSG). Set the standard signal generator (SSG) at same frequency and transmit on, then set SSG output power at Pt to give the equivalent output level of "E".
7. Calculate antenna power density by the formula below PD=Pt+10*log(1/x).x:The duty cycle of the EUT in continuously transmitting mode
8. Pt: Output power of the SSG
9. Antenna Power Error is definition that actual measure antenna power tolerance between +20%to-80% power range that base on manufacturer declare the conducted power density.
10. EIRP=conductedpower+antennagain

11.3 TEST SETUP

Diagram: Two test setups are shown. The first shows a Power Meter connected to a Spectrum Analyzer, which is connected to the EUT. The second shows a Power Meter connected to a Spectrum Analyzer, which is connected to a Signal Generator.

11.4 TEST DEVIATION

There is no deviation with the original standard.

11.5 EUT OPERATION DURING TEST

The EUT was programmed to be in normal transmitting mode.

11.6 TEST RESULT OF TRANSMISSION ANTENNA GAIN (EIRP ANTENNA POWER)

Please refer to Appendix C.3

NOTE:
1). Worst case data at 6Mbps at IEEE 802.11a; MCS0 at IEEE 802.11n HT20, IEEE 802.11n HT40, IEEE 802.11a VHT20, IEEE 802.11ac VHT40, IEEE 802.11ac VHT80;
2).EIRP=conductedpower+antennagain

Test result: The unit does meet the requirements.

12. SPURIOUS EMISSIONS FOR RECEIVER

12.1 LIMIT

12.2 TEST PROCEDURE

1. EUT have the continuous reception mode and fixed only one channelize.
2. SA set RBW:100KHz and VBW: 100KHz. Then adjust to start frequency 30MHz and stop frequency 1000MHz. Search to mark peak reading value + cable loss shall be less than 4nW.
3. SA set RBW: 1MHz and VBW: 1MHz. Then adjust to start frequency 1000MHz and stop frequency 12500MHz. Search to mark peak reading value + cable loss shall be less than 20nW.
4. If power level of lower emissions are more than 1/10 of limit (.0.4nW for f < 1GHz, 2nW for f >=1GHz), all those are to be indicated in the 2nd and 3rd lines. If others are 1/10 or less more of the limit, no necessary to be indicated.

12.3 TEST SETUP LAYOUT

Diagram: A test setup layout showing Spectrum Analyzer connected to EUT.

12.4 TEST DEVIATION

There is no deviation with the original standard.

12.5 EUT OPERATION DURING TEST

The EUT was programmed to be in continuously reception mode.

12.6 TEST RESULT OF LIMITATION OF COLLATERAL EMISSION OF RECEIVER

Please refer to Appendix C.8

NOTE:
1). Worst case data at 6Mbps at IEEE 802.11a; MCS0 at IEEE 802.11n HT20, IEEE 802.11n HT40, IEEE 802.11a VHT20, IEEE 802.11ac VHT40, IEEE 802.11ac VHT80;

Test result: The unit does meet the requirements.

13. TRANSMISSION BURST LENGTH

13.1 LIMITS OF BURST LENGTH

13.2 MEASURING INSTRUMENTS

See list of measuring instruments of this test report.

13.3 TEST PROCEDURES

1. Setting of SA is following as: RBW: 1MHz/VBW:1MHz /Sweep Mode:Single sweep/Detect mode: Positive peak/Zero Span I Sweet time: more than burst length.
2. Measure the maximum time duration of one burst length.

13.4 TEST SETUP

Diagram: A test setup layout showing Spectrum Analyzer connected to EUT.

13.5 TEST DEVIATION

There is no deviation with the original standard.

13.6 EUT OPERATION DURING TEST

The EUT was programmed to be in continuously transmitting mode.

13.7 TEST RESULT OF TRANSMISSION BURST LENGTH

Please refer to Appendix C.7

NOTE:
1). Worst case data at 6Mbps at IEEE 802.11a; MCS0 at IEEE 802.11n HT20, IEEE 802.11n HT40, IEEE 802.11a VHT20, IEEE 802.11ac VHT40, IEEE 802.11ac VHT80;

Test result: The unit does meet the requirements.

14. RADIO INTERFERENCE PREVENTION CAPABILITY MEASUREMENT

14.1 LIMIT

14.2 MEASURING ID CODE SOFTWARE

14.3 TEST PROCEDURES

1. In the case that the EUT has the function of automatically transmitting the identification code: a. Transmit the predetermined identification codes form EUT. b. Check the transmitted identification codes with the demodulator.
2. In the case of receiving the identification ocde: a. Transmit the predetermined identification codes form the counterpart. b . Check if communication is normal. c. Transmit the signals other than predetermined ID codes form the counterpart. d. check if the EUT stops the transmission, or if it displays that idnetification codes are different from the predetermined ones.

14.4 TEST SETUP LAYOUT

Diagram: A test setup layout showing a PC with Net Tool Software connected to a Peripheral, which is connected to the EUT.

14.5 TEST DEVIATION

There is no deviation with the original standard.

14.6 EUT OPERATION DURING TEST

The EUT was programmed to be in normal transmitting mode.

14.7 TEST RESULT OF RADIO INTERFERENCE PREVENTION CAPABILIT

The device consists of the PIFA antenna and 5 GHz WIFI IC; Component IC CPU also can use the protocol function to protect interference come from outside.

We can use the EUT connect a Mobile phone as AP to detect WiFi ID information, Test configuration:

Diagram: A diagram showing WiFi (EUT) connected to a Mobile phone.

Test Procedure: The measuring method is according to MIC Notice No.88 Appendix No.43. Run the WiFi and keep WiFi connecting at Mobile phone. The MIC address will be found in the incoming settings.

Test Results:

Test result: The unit does meet the requirements.

15. CARRIER SENSE CAPABILITY

15.1 LIMIT

EUT stop RF transmission signal after carrier inject to EUT

15.2 TEST PROCEDURE

Diagram: A measurement system diagram showing Signal Generator, Attenuator (10 dB), Power Splitter, Spectrum Analyzer, EUT, and Peripheral.

1. SG adjusted the frequency as same as the EUT transmitted signal and emitted the absence of modulation from SG and power level is (on 22.79+G-20*log(f)dBm)(G is the antenna gain, f is the test frequency).
2. turn off the RF signal of the SG.
3. EUT have transmitted the maximum modulation signal and fixed channelize.
4. Setting of SA :RBW/VBW=1MHz/1MHz,Span=50MHz, Sweep time=auto, Sweep mode=continuous, Detect mode=positive peak
5. SG RF signal on.
6. EUT shall be stop the transmitted any signal and SG RF signal off, the EUT will be continuous transmitted signal.

Pin=22.79+Gr-20*log(freq_MHz)[dBm]
Limit:100mw/m eirp
Confirmed at -50dBm
Result: OK

EUT TEST PHOTO

Measurement Photos

Photograph showing a test setup with a laptop (EUT) connected to various measurement instruments, including a spectrum analyzer and other electronic equipment.