FCC PART 15 SUBPART C TEST REPORT
Report Reference No.: CTA25020801003
FCC ID: 2BNR7-T90
Applicant and Product Information
Applicant: Shenzhen Baijin Technology Co., Ltd
Applicant Address: C203-J2, Bldg C, No.19 Yinzhu Rd, Nanlian Comm, Longgang St, Longgang Dist, Shenzhen, China
Manufacturer: Shenzhen Baijin Technology Co., Ltd
Manufacturer Address: C203-J2, Bldg C, No.19 Yinzhu Rd, Nanlian Comm, Longgang St, Longgang Dist, Shenzhen, China
Test Item Description: Tablet PC
Trade Mark: TABWEE
Model/Type reference: T90
Listed Models: M9
Modulation Type: CCK/DSSS/OFDM
Operation Frequency: From 2412 - 2462MHz
Rating: DC 3.85V From battery and DC 5.0V From external circuit
Result: PASS
Test Standards
The tests were performed according to following standards:
- FCC Rules Part 15.247: Frequency Hopping, Direct Spread Spectrum and Hybrid Systems that are in operation within the bands of 902-928 MHz, 2400-2483.5 MHz, and 5725-5850 MHz.
- ANSI C63.10-2013: American National Standard for Testing Unlicensed Wireless Devices
- KDB558074 D01 v05r02: Guidance for Compliance Measurements on Digital Transmission Systems (DTS), Frequency Hopping Spread Spectrum System(HFSS), and Hybrid System Devices Operating Under §15.247 of The FCC rules.
Summary
Date of receipt of test sample: Feb. 08, 2025
Testing commenced on: Feb. 08, 2025
Testing concluded on: Feb. 17, 2025
Product Name: Tablet PC
Model/Type reference: T90
Power supply: DC 3.85V From battery and DC 5.0V From external circuit
Adapter information: Model: KWY10W-0502000US, Input: AC 100-240V 50/60Hz 0.3A, Output: DC 5V 2A
Testing sample ID: CTA250208010-1# (Engineer sample), CTA250208010-2# (Normal sample)
Hardware version: V1.0
Software version: V1.0
WIFI Details:
- Supported type: 802.11b/802.11g/802.11n(H20)/ 802.11n(H40)
- Modulation: 802.11b: DSSS; 802.11g/802.11n(H20)/ 802.11n(H40): OFDM
- Operation frequency: 802.11b/802.11g/802.11n(H20): 2412MHz~2462MHz; 802.11n(H40): 2422MHz~2452MHz
- Channel number: 802.11b/802.11g/802.11n(H20): 11; 802.11n(H40):7
- Channel separation: 5MHz
- Antenna type: PIFA antenna
- Antenna gain: -0.17 dBi
Equipment Under Test Power Supply:
Power supply system utilised: DC 3.85V From battery and DC 5.0V From external circuit
Short description of the Equipment Under Test (EUT): This is a Tablet PC. For more details, refer to the user's manual of the EUT.
EUT Configuration and Operation
EUT configuration: The following peripheral devices and interface cables were connected during the measurement: - supplied by the manufacturer; - supplied by the lab.
EUT operation mode: The application provider specific test software (AT command) was used to control the sample in continuous TX and RX (Duty Cycle >98%) for testing, meeting KDB558074 test requirements. IEEE 802.11b/g/n: Thirteen channels are provided to the EUT.
Block Diagram of Test Setup: A diagram shows the EUT connected to a DC 5.0V From Adapter.
Modifications: No modifications were implemented to meet testing criteria.
Test Environment
Address of the test laboratory: Shenzhen CTA Testing Technology Co., Ltd., Room 106, Building 1, Yibaolai Industrial Park, Qiaotou Community, Fuhai Street, Bao'an District, Shenzhen, China.
Test Facility: The test facility is recognized, certified, or accredited by the following organizations: FCC-Registration No.: 517856 (Designation Number: CN1318), A2LA-Lab Cert. No.: 6534.01, ISED#: 27890 (CAB identifier: CN0127). The 3m-Semi anechoic test site fulfils CISPR 16-1-4 according to ANSI C63.10 and CISPR 16-1-4:2010.
Environmental conditions:
| Test | Temperature | Humidity | Atmospheric pressure |
|---|---|---|---|
| Radiated Emission | 25 C | 45 % | 950-1050mbar |
| Conducted testing | 25 C | 44 % | 950-1050mbar |
| AC Power Conducted Emission | 24 C | 44 % | 950-1050mbar |
Test Description and Results
The following tests were conducted according to FCC standards:
| Test Description | Result |
|---|---|
| AC Power Conducted Emission | PASS |
| 6dB Bandwidth | PASS |
| Spurious RF Conducted Emission | PASS |
| Maximum Peak Conducted Output Power | PASS |
| Power Spectral Density | PASS |
| Radiated Emissions | PASS |
| Band Edge | PASS |
| Antenna Requirement | PASS |
Data Rate Used:
Preliminary tests were performed in different data rates to find the worst-case radiated emission. The table below shows the worst-case rate with respect to the specific test item. Investigation was done on all possible configurations for searching the worst cases. The following table lists the test modes shown in this test report.
| Test Items | Mode | Data Rate | Channel |
|---|---|---|---|
| Maximum Peak Conducted Output Power | 11b/DSSS | 1 Mbps | 1/6/11 |
| 11g/OFDM | 6 Mbps | 1/6/11 | |
| 11n(20MHz)/OFDM | 6.5Mbps | 1/6/11 | |
| 11n(40MHz)/OFDM | 13.5Mbps | 3/6/9 | |
| Power Spectral Density | 11b/DSSS | 1 Mbps | 1/11 |
| 11g/OFDM | 6 Mbps | 1/11 | |
| 11n(20MHz)/OFDM | 6.5Mbps | 1/11 | |
| 11n(40MHz)/OFDM | 13.5Mbps | 3/9 | |
| 6dB Bandwidth | 11b/DSSS | 1 Mbps | 1/6/11 |
| 11g/OFDM | 6 Mbps | 1/6/11 | |
| 11n(20MHz)/OFDM | 6.5Mbps | 1/6/11 | |
| 11n(40MHz)/OFDM | 13.5Mbps | 3/9 | |
| Spurious RF conducted emission | 11b/DSSS | 1 Mbps | 1/11 |
| 11g/OFDM | 6 Mbps | 1/11 | |
| 11n(20MHz)/OFDM | 6.5Mbps | 1/11 | |
| 11n(40MHz)/OFDM | 13.5Mbps | 3/9 | |
| Radiated Emission 9KHz~1GHz& Radiated Emission 1GHz~10th Harmonic | 11b/DSSS | 1 Mbps | 1/11 |
| 11g/OFDM | 6 Mbps | 1/11 | |
| 11n(20MHz)/OFDM | 6.5Mbps | 1/11 | |
| 11n(40MHz)/OFDM | 13.5Mbps | 3/9 | |
| Band Edge | 11b/DSSS | 1 Mbps | 1/11 |
| 11g/OFDM | 6 Mbps | 1/11 | |
| 11n(20MHz)/OFDM | 6.5Mbps | 1/11 | |
| 11n(40MHz)/OFDM | 13.5Mbps | 3/9 |
Statement of the measurement uncertainty:
The data and results referenced in this document are true and accurate. The reader is cautioned that there may be errors within the calibration limits of the equipment and facilities. The measurement uncertainty was calculated for all measurements listed in this test report acc. to TR-100028-01"Electromagnetic compatibility and Radio spectrum Matters (ERM);Uncertainties in the measurement of mobile radio equipment characteristics; Part 1" and TR-100028-02 "Electromagnetic compatibility and Radio spectrum Matters (ERM);Uncertainties in the measurement of mobile radio equipment characteristics; Part 2 " and is documented in the Shenzhen CTA Testing Technology Co., Ltd. quality system acc. to DIN EN ISO/IEC 17025. Furthermore, component and process variability of devices similar to that tested may result in additional deviation. The manufacturer has the sole responsibility of continued compliance of the device.
Measurement Capability:
| Test | Range | Measurement Uncertainty |
|---|---|---|
| Radiated Emission | 9KHz~30MHz | 3.02 dB |
| Radiated Emission | 30~1000MHz | 4.06 dB |
| Radiated Emission | 1~18GHz | 5.14 dB |
| Radiated Emission | 18-40GHz | 5.38 dB |
| Conducted Disturbance | 0.15~30MHz | 2.14 dB |
| Output Peak power | 30MHz~18GHz | 0.55 dB |
| Power spectral density | / | 0.57 dB |
| Spectrum bandwidth | / | 1.1% |
| Radiated spurious emission (30MHz-1GHz) | 30~1000MHz | 4.10 dB |
| Radiated spurious emission (1GHz-18GHz) | 1~18GHz | 4.32 dB |
| Radiated spurious emission (18GHz-40GHz) | 18-40GHz | 5.54 dB |
(1) This uncertainty represents an expanded uncertainty expressed at approximately the 95% confidence level using a coverage factor of k=2.
Equipments Used during the Test
| Test Equipment | Manufacturer | Model No. | Equipment No. | Calibration Date | Calibration Due Date |
|---|---|---|---|---|---|
| LISN | R&S | ENV216 | CTA-308 | 2024/08/03 | 2025/08/02 |
| LISN | R&S | ENV216 | CTA-314 | 2024/08/03 | 2025/08/02 |
| EMI Test Receiver | R&S | ESPI | CTA-307 | 2024/08/03 | 2025/08/02 |
| EMI Test Receiver | R&S | ESCI | CTA-306 | 2024/08/03 | 2025/08/02 |
| Spectrum Analyzer | Agilent | N9020A | CTA-301 | 2024/08/03 | 2025/08/02 |
| Spectrum Analyzer | R&S | FSU | CTA-337 | 2024/08/03 | 2025/08/02 |
| Vector Signal generator | Agilent | N5182A | CTA-305 | 2024/08/03 | 2025/08/02 |
| Analog Signal Generator | R&S | SML03 | CTA-304 | 2024/08/03 | 2025/08/02 |
| WIDEBAND RADIO COMMUNICATION TESTER | CMW500 | R&S | CTA-302 | 2024/08/03 | 2025/08/02 |
| Temperature and humidity meter | Chigo | ZG-7020 | CTA-326 | 2024/08/03 | 2025/08/02 |
| Ultra-Broadband Antenna | Schwarzbeck | VULB9163 | CTA-310 | 2023/10/17 | 2026/10/16 |
| Horn Antenna | Schwarzbeck | BBHA 9120D | CTA-309 | 2023/10/13 | 2026/10/12 |
| Loop Antenna | Zhinan | ZN30900C | CTA-311 | 2023/10/17 | 2026/10/16 |
| Horn Antenna | Beijing Hangwei Dayang | OBH100400 | CTA-336 | 2023/10/17 | 2026/10/16 |
| Amplifier | Schwarzbeck | BBV 9745 | CTA-312 | 2024/08/03 | 2025/08/02 |
| Amplifier | Taiwan chengyi | EMC051845B | CTA-313 | 2024/08/03 | 2025/08/02 |
| Directional coupler | NARDA | 4226-10 | CTA-303 | 2024/08/03 | 2025/08/02 |
| High-Pass Filter | XingBo | XBLBQ-GTA18 | CTA-402 | 2024/08/03 | 2025/08/02 |
| High-Pass Filter | XingBo | XBLBQ-GTA27 | CTA-403 | 2024/08/03 | 2025/08/02 |
| Automated filter bank | Tonscend | JS0806-F | CTA-404 | 2024/08/03 | 2025/08/02 |
| Power Sensor | Agilent | U2021XA | CTA-405 | 2024/08/03 | 2025/08/02 |
| Amplifier | Schwarzbeck | BBV9719 | CTA-406 | 2024/08/03 | 2025/08/02 |
| EMI Test Software | Tonscend | TS®JS32-RE | 5.0.0.2 | N/A | N/A |
| EMI Test Software | Tonscend | TS®JS32-CE | 5.0.0.1 | N/A | N/A |
| RF Test Software | Tonscend | TS®JS1120-3 | 3.1.65 | N/A | N/A |
| RF Test Software | Tonscend | TS®JS1120 | 3.1.46 | N/A | N/A |
AC Power Conducted Emission
Test Configuration: The test setup includes the EUT, a LISN, and an EMI receiver. The EUT is placed on a wooden table 0.8m above the ground plane. The LISN provides the power source and is grounded.
Test Procedure: The EUT was set up to simulate typical usage. Emissions were measured on each current carrying line using a spectrum analyzer connected to the LISN. Measurements were taken from 150 KHz to 30MHz, with emissions maximized by cable manipulation.
AC Power Conducted Emission Limit:
| Frequency range (MHz) | Limit (dBuV) | |
|---|---|---|
| Quasi-peak | Average | |
| 0.15-0.5 | 66 to 56* | 56 to 46* |
| 0.5-5 | 56 | 46 |
| 5-30 | 60 | 50 |
* Decreases with the logarithm of the frequency.
Test Results:
The results show that the measured emissions are within the specified limits for both Line (L) and Neutral (N) polarizations. Graphs and data lists are provided in the original document.
Radiated Emission
Test Configuration:
- Frequency range 9 KHz – 30MHz: Setup includes EUT, Loop antenna, Turntable, Ground Plane, and Test Receiver, connected via Coaxial Cable. Distance from antenna to EUT is 3m.
- Frequency range 30MHz – 1000MHz: Setup includes EUT, Turntable, Ground Plane, Antenna, and Test Receiver, connected via Coaxial Cable. Distance from antenna to EUT is 3m.
- Frequency range above 1GHz-25GHz: Setup in a Semi-Anechoic Chamber with EUT, Turntable, Ground Plane, Antenna, Measurement Instrument, and Controller, connected via Coaxial Cable. Distance from antenna to EUT is 3m.
Test Procedure: The EUT was placed on a turntable 0.8m (or 1.5m for >1GHz) above the ground plane. The receiving antenna height was varied from 1m to 4m, and the turntable rotated from 0° to 360° to find maximum emissions. Polarization (horizontal and vertical) was also adjusted. Measurements covered 9KHz to 25GHz.
Field Strength Calculation: FS = RA + AF + CL - AG (Field Strength = Reading Amplitude + Antenna Factor + Cable Loss - Amplifier Gain).
Radiation Limit:
| Frequency (MHz) | Distance (Meters) | Radiated (dBμV/m) | Radiated (μV/m) |
|---|---|---|---|
| 0.009-0.49 | 3 | 20log(2400/F(KHz))+40log(300/3) | 2400/F(KHz) |
| 0.49-1.705 | 3 | 20log(24000/F(KHz))+ 40log(30/3) | 24000/F(KHz) |
| 1.705-30 | 3 | 20log(30)+ 40log(30/3) | 30 |
| 30-88 | 3 | 40.0 | 100 |
| 88-216 | 3 | 43.5 | 150 |
| 216-960 | 3 | 46.0 | 200 |
| Above 960 | 3 | 54.0 | 500 |
Test Results Remark: The worst case was found in the X position. For emissions below 1GHz, the worst case was recorded for 802.11b low channel. No significant emissions were found from 9 KHz to 30MHz.
Data tables and graphs for Horizontal and Vertical polarization for 30MHz-1GHz and 1GHz-25GHz are provided in the original document.
Maximum Peak Conducted Output Power
Limit: The Maximum Peak Output Power Measurement is 30dBm.
Test Procedure: Remove the antenna from the EUT and connect a low loss RF cable from the antenna port to the power sensor.
Test Configuration: EUT connected to Power Sensor.
Test Results:
| Type | Channel | Output power PK (dBm) | Limit (dBm) | Result |
|---|---|---|---|---|
| 802.11b | 01 | 8.00 | 30.00 | Pass |
| 06 | 7.32 | |||
| 11 | 7.24 | |||
| 802.11g | 01 | 7.01 | 30.00 | Pass |
| 06 | 6.24 | |||
| 11 | 5.79 | |||
| 802.11n(HT20) | 01 | 7.14 | 30.00 | Pass |
| 06 | 6.07 | |||
| 11 | 5.80 | |||
| 802.11n(HT40) | 03 | 6.72 | 30.00 | Pass |
| 06 | 6.48 | |||
| 09 | 6.27 |
Note: Measured output power at difference data rates for each mode and recorded worst case. Test results include cable loss. Worst case data provided for 1Mbps (802.11b), 6Mbps (802.11g), 6.5Mbps (802.11n HT20), and 13.5Mbps (802.11n HT40).
Power Spectral Density
Limit: For digitally modulated systems, the power spectral density shall not be greater than 8 dBm in any 3 kHz band.
Test Procedure: Used procedure similar to peak conducted output power measurement. RBW ≥ 3 kHz, VBW ≥ 3x RBW, Span = 1.5x DTS channel bandwidth, Detector = peak, Trace mode = max hold.
Test Configuration: EUT connected to SPECTRUM ANALYZER.
Test Results:
| Type | Channel | Power Spectral Density (dBm/3KHz) | Limit (dBm/3KHz) | Result |
|---|---|---|---|---|
| 802.11b | 01 | -17.80 | 8.00 | Pass |
| 06 | -18.62 | |||
| 11 | -18.96 | |||
| 802.11g | 01 | -25.62 | 8.00 | Pass |
| 06 | -25.74 | |||
| 11 | -26.27 | |||
| 802.11n(HT20) | 01 | -24.49 | 8.00 | Pass |
| 06 | -25.28 | |||
| 11 | -25.63 | |||
| 802.11n(HT40) | 03 | -28.44 | 8.00 | Pass |
| 06 | -28.29 | |||
| 09 | -27.25 |
Note: Measured peak power spectrum density at difference data rates for each mode and recorded worst case. Test results include cable loss. Worst case data provided for 1Mbps (802.11b), 6Mbps (802.11g), 6.5Mbps (802.11n HT20), and 13.5Mbps (802.11n HT40).
6dB Bandwidth
Limit: For digital modulation systems, the minimum 6 dB bandwidth shall be at least 500 kHz.
Test Procedure: Transmitter output connected to spectrum analyzer with 100 KHz RBW and 300 KHz VBW. 6dB bandwidth is defined as the total spectrum power higher than peak power minus 6dB.
Test Configuration: EUT connected to SPECTRUM ANALYZER.
Test Results:
| Type | Channel | 6dB Bandwidth (MHz) | Limit (KHz) | Result |
|---|---|---|---|---|
| 802.11b | 01 | 9.120 | ≥500 | Pass |
| 06 | 9.200 | |||
| 11 | 9.600 | |||
| 802.11g | 01 | 15.760 | ≥500 | Pass |
| 06 | 15.680 | |||
| 11 | 15.720 | |||
| 802.11n(HT20) | 01 | 16.680 | ≥500 | Pass |
| 06 | 15.640 | |||
| 11 | 16.080 | |||
| 802.11n(HT40) | 03 | 36.000 | ≥500 | Pass |
| 06 | 35.120 | |||
| 09 | 30.080 |
Note: Measured peak power spectrum density at difference data rates for each mode and recorded worst case. Test results include cable loss. Worst case data provided for 1Mbps (802.11b), 6Mbps (802.11g), 6.5Mbps (802.11n HT20), and 13.5Mbps (802.11n HT40).
Out-of-band Emissions
Limit: In any 100 kHz bandwidth outside the frequency band, the radio frequency power shall be at least 20 dB below that in the 100 kHz bandwidth within the band containing the highest level of desired power. For RMS averaging, attenuation is 30 dB. Attenuation below general limits specified in §15.209(a) is not required.
Test Procedure: Transmitter output connected to spectrum analyzer with RBW=100 kHz, VBW= 300 kHz, peak detector, and max hold. Measurements were made of the in-band reference level, bandedge, and out-of-band emissions.
Test Configuration: EUT connected to SPECTRUM ANALYZER.
Test Results Remark: Measurement frequency range is from 30MHz to the 10th harmonic of the fundamental frequency. Lowest, middle, and highest channels were tested to verify spurious emissions and band edge data. The worst data is recorded.
Plots for various modes and channels are provided in the original document.
Antenna Requirement
The EUT uses a PIFA antenna. The antenna gain is -0.17 dBi. The antenna is not designed to be replaced by the user, and the antenna is permanently attached. Therefore, the EUT complies with the antenna requirement.
