Applicant Information
Applicant Name: Shenzhen DOOGEE Hengtong Technology CO.,LTD
Address: B, 2/F, Building A4, Silicon Valley Power Digital Industrial Park, No. 22, Longhua New District, Shenzhen, China
Product Information
EUT Name: Tablet
Brand Name: DOOGEE
Model Number: Tab E3 Max
Series Model Number: Tab E3 Max VIP Edition, Tab E3 Pro, Tab E3 Pro VIP Edition, Tab E3 Pro+, Tab E3 Pro+ VIP Edition, Tab E3 Pro Max, Tab E3 Pro Max VIP Edition, Tab E3 Ultra, Tab E3 Power
FCC ID: 2AX4YTABE3MAX
Issuing Laboratory
Company Name: BTF Testing Lab (Shenzhen) Co., Ltd.
Address: 101/201/301, Building 1, Block 2, Tantou Industrial Park, Tantou Community, Songgang Subdistrict, Bao'an District, Shenzhen, China
Test Standards: FCC CFR Title 47 Part 15 Subpart C (§15.247)
Test Conclusion: Pass
Date of Issue: 2025-05-23
Test By: Sean He / Tester
Prepared By: Chris Liu / Project engineer
Approved By: Ryan.CJ / EMC manager
Laboratory Details
Laboratory Location: BTF Testing Lab (Shenzhen) Co., Ltd., F101, 201 and 301, Building 1, Block 2, Tantou Industrial Park, Tantou Community, Songgang Street, Bao'an District, Shenzhen, China
Laboratory Facility Accreditation: Recognized by FCC (Designation No.: CN1409, Registration No. 518915), CNAS (Registration No.: CNAS L17568, accredited to ISO/IEC 17025:2017), A2LA (Registration No.: 6660.01, accredited to ISO/IEC 17025:2017).
Revision History
Version: R_V0
Issue Date: 2025-05-23
Revisions Content: Original
Summary of Test Results
The following tests were performed on the DOOGEE Tab E3 Max:
| Item | Standard | Requirement | Result |
|---|---|---|---|
| Antenna requirement | 47 CFR Part 15.247 | Part 15.203 | Pass |
| Conducted Emission at AC power line | 47 CFR Part 15.247 | 47 CFR 15.207(a) | Pass |
| Occupied Bandwidth | 47 CFR Part 15.247 | 47 CFR 15.215(c) | Pass |
| Maximum Conducted Output Power | 47 CFR Part 15.247 | 47 CFR 15.247(b)(1) | Pass |
| Channel Separation | 47 CFR Part 15.247 | 47 CFR 15.247(a)(1) | Pass |
| Number of Hopping Frequencies | 47 CFR Part 15.247 | 47 CFR 15.247(a)(1)(iii) | Pass |
| Dwell Time | 47 CFR Part 15.247 | 47 CFR 15.247(a)(1)(iii) | Pass |
| Emissions in non-restricted frequency bands | 47 CFR Part 15.247 | 47 CFR 15.247(d) | Pass |
| Band edge emissions (Radiated) | 47 CFR Part 15.247 | 47 CFR 15.247(d) | Pass |
| Emissions in restricted frequency bands (below 1GHz) | 47 CFR Part 15.247 | 47 CFR 15.247(d) | Pass |
| Emissions in restricted frequency bands (above 1GHz) | 47 CFR Part 15.247 | 47 CFR 15.247(d) | Pass |
Test Standards: FCC CFR Title 47 Part 15 Subpart C (§15.247), ANSI C63.10-2020, KDB 558074 D01 15.247.
Uncertainty of Test: Measurements include Occupied Channel Bandwidth (±5%), RF output power (±1.5 dB), Power Spectral Density (±3.0 dB), Unwanted Emissions (±3.0 dB), Supply voltages (±3%), Time (±5%), Conducted Emission for LISN (9kHz ~ 150kHz) (±2.97 dB), Conducted Emission for LISN (150kHz ~ 30MHz) (±2.45 dB), Radiated Emission (30MHz ~ 1000MHz) (±4.80 dB), Radiated Emission (1GHz ~ 18GHz) (±4.82 dB).
Product Technical Specifications
Operation Frequency: 2402MHz ~ 2480MHz
Channel Numbers: 79
Channel Separation: 1MHz
Modulation Technology: GFSK, π/4 DQPSK, 8DPSK
Data Rate: 1/2/3 Mbits/s
Max. Conducted Peak Power: 12.27dBm
Antenna Type: PIFA Antenna
Antenna Gain: 2.23dBi (declared by Applicant)
Antenna Transmit Mode: SISO (1TX, 1RX)
Fast Charger Details: Manufacturer: Shenzhen Huajin Electronics Co.,LTD, Model: HJ-PD18W-US, Input: AC100-240V~ 50/60Hz 0.6A, Output: 5.0V=3.0A 15.0W OR 9.0V=2.0A 18.0W OR 12.0V=1.5A (18.0W MAX)
Test Configuration
Test Equipment Used:
- Radiated Test Method: EMI Receiver (Rohde & Schwarz ESCI7), Signal Analyzer (Rohde & Schwarz FSQ40), Log periodic antenna (Schwarzbeck VULB 9168), Preamplifier (Schwarzbeck BBV9744), Horn Antenna (Schwarzbeck BBHA9120D, SCHWARZBECK BBHA9170), Preamplifier (TST Pass LNA10180G45), Test Software (Frad EZ EMC).
- Conducted Emission Test: EMI Receiver (Rohde & Schwarz ESCI3), V-LISN (Schwarzbeck NSLK 8127), Coaxial Switcher (Schwarzbeck CX210), Pulse Limiter (Schwarzbeck VTSD 9561-F), Test Software (Frad EZ EMC).
- Conducted Test Method: Spectrum Analyzer (Keysight N9020A), ESG Vector Signal Generator (Agilent E4438C), MXG Vector Signal Generator (Agilent N5182A), Wideband Radio Communication Tester (Rohde&Schwarz CMW500), Temperature Humidity Chamber (ZZCKONG ZZ-K02A), DC Power Supply (Tongmen etm-6050c), RF Control Unit (Techy TR1029-1), RF Sensor Unit (Techy TR1029-2), Test Software (TST Pass).
Test Auxiliary Equipment: Fast Charger (Shenzhen Huajin Electronics Co.,LTD HJ-PD18W-US).
Test Modes: The EUT was tested in various modes including TX-GFSK (Non-Hopping), TX-Pi/4DQPSK (Non-Hopping), TX-8DPSK (Non-Hopping), TX-GFSK (Hopping), TX-Pi/4DQPSK (Hopping), and TX-8DPSK (Hopping).
Test Software: Engineering mode, Version: DOOGEE-Tab E3 Max-EEA-Android15.0.
Test Setup Diagrams:
- Conducted Emission Measurement: The setup involves the EUT connected via a Line Impedance Stabilization Network (LISN) to a receiver. A pulse limiter and a vertical reference ground plane are used. The equipment is placed on a non-conducting table.
- Radiated Emission Measurement (Below 1GHz): The EUT is placed on a turntable at a specified distance (e.g., 3 meters) from a receiving antenna. The setup includes a receiver and a preamplifier.
- Radiated Emission Measurement (Above 1GHz): Similar to the below 1GHz setup, but the antenna height is adjustable (1-4 meters).
Evaluation Results
5.1 Antenna Requirement: The EUT is designed with an antenna permanently attached or uses a unique coupling, complying with the requirements.
Radio Spectrum Matter Test Results (RF)
6.1 Conducted Emission at AC Power Line:
The test measures radio frequency voltage conducted back onto the AC power line. Limits are defined for Quasi-peak and Average detectors across frequency ranges from 0.15 kHz to 30 MHz.
Test Data Summary: The EUT passed the conducted emission tests.
6.2 Occupied Bandwidth:
This test assesses the 20 dB bandwidth of the emission to ensure it falls within the designated frequency band. The procedure involves using a spectrum analyzer with specific settings for span, RBW, VBW, detector, and trace mode.
Test Data Summary: The EUT's occupied bandwidth was measured and found to comply with standards. Detailed data is available in Appendix-EDR.
6.3 Maximum Conducted Output Power:
This test evaluates the maximum peak output power for frequency hopping systems. The limit is 1 watt or 0.125 watts depending on the number of hopping channels. The test is conducted via a direct connection to the spectrum analyzer.
Test Data Summary: The EUT's maximum conducted output power was measured and found to comply with standards. Detailed data is available in Appendix-EDR.
6.4 Channel Separation:
This test ensures that hopping channel carrier frequencies are separated by a minimum of 25 kHz or the 20 dB bandwidth, whichever is greater. The procedure uses a spectrum analyzer with marker-delta function.
Test Data Summary: The EUT's channel separation complies with the requirements. Detailed data is available in Appendix-EDR.
6.5 Number of Hopping Frequencies:
Frequency hopping systems must use at least 15 channels. This test verifies the number of hopping frequencies used by the EUT.
Test Data Summary: The EUT complies with the number of hopping frequencies requirement. Detailed data is available in Appendix-EDR.
6.6 Dwell Time:
This test measures the average time of occupancy on any channel for frequency hopping systems, ensuring it does not exceed 0.4 seconds within a specific period. The procedure involves using a spectrum analyzer with zero span and specific trigger settings.
Test Data Summary: The EUT's dwell time complies with the requirements. Detailed data is available in Appendix-EDR.
6.7 Emissions in Non-Restricted Frequency Bands:
This test measures spurious emissions outside the operating frequency band, requiring them to be at least 20 dB below the highest level of the desired power. The procedure involves measuring conducted spurious emissions.
Test Data Summary: The EUT complies with the emissions limits in non-restricted frequency bands. Detailed data is available in Appendix-EDR.
6.8 Band Edge Emissions (Radiated):
This test assesses radiated emissions at the band edges, ensuring compliance with restricted band limits and that other emissions are at least 20dB below the fundamental. The procedure follows ANSI C63.10-2020.
Test Data Summary: The EUT passed the radiated band edge emissions tests for GFSK, π/4 DQPSK, and 8DPSK modes across the tested frequency ranges (2310MHz-2410MHz and 2450MHz-2550MHz).
6.9 Radiated Emissions (below 1GHz):
This test measures radiated emissions from 30 MHz up to 1 GHz, ensuring compliance with field strength limits specified in FCC Part 15.209. The test involves placing the EUT on a turntable and measuring emissions with a receiving antenna.
Test Data Summary: The EUT passed the radiated emissions tests below 1GHz for Horizontal and Vertical polarizations.
6.10 Radiated Emissions (above 1GHz):
This test measures radiated emissions above 1 GHz, ensuring compliance with field strength limits. The test was performed for GFSK modes (Low, Mid, High) as GFSK was identified as the worst-case mode.
Test Data Summary: The EUT passed the radiated emissions tests above 1GHz for GFSK modes.
Test Setup Photos & EUT Details
Details regarding test setup photos and EUT constructional details are provided in Appendices I, II, and III of the original report.
