1. GENERAL INFORMATION
1.1 Description of Device (EUT)
EUT: WIRELESS SPEAKER
Test Model: ZEALOT-S67
Power Supply: Input: DC 5V, Battery: DC 7.4V, 7200mAh*2
Bluetooth Details
Frequency Range: 2402MHz~2480MHz
Channel Number: 79 channels for Bluetooth V5.2(DSS)
Channel Spacing: 1MHz for Bluetooth V5.2 (DSS)
Modulation Type: GFSK, π/4-DQPSK, 8-DPSK for Bluetooth V5.2(DSS)
Bluetooth Version: V5.2
Antenna Description: PCB Antenna, 1.7dBi(Max.)
1.2 Host System Configuration List and Details
Manufacturer: SHENZHEN TIANYIN ELECTRONICS CO., LTD
Description: Power Adapter
Model: TPA-46050200 UU
Note: Auxiliary equipment is provided by the laboratory.
1.3. External I/O Cable
| I/O Port Description | Quantity | Cable |
|---|---|---|
| Type-C Port | 1 | N/A |
| USB Port | 1 | N/A |
| AUX IN Port | 1 | N/A |
| TF Card Port | 1 | N/A |
1.4 Description of Test Facility
NVLAP Accreditation Code: 600167-0
FCC Designation Number: CN5024
CAB identifier: CN0071
CNAS Registration Number: L4595
Test Firm Registration Number: 254912
The 3m-Semi anechoic test site fulfils CISPR 16-1-4 requirements for radiated emission above 1GHz.
1.5 Statement of the Measurement Uncertainty
The data and results are true and accurate. Measurement uncertainty was calculated according to CISPR 16-4 and documented in the LCS quality system acc. To DIN EN ISO/IEC 17025. Component and process variability may result in additional deviation. The manufacturer is responsible for continued compliance.
1.7 Description of Test Modes
Bluetooth operates in the 2.4GHz ISM Band using GFSK modulation for data rates up to 1 Mb/s. Tests were performed in X, Y, and Z axes. The worst-case results are reported. Standard test modes include TX Mode/Hopping Mode for Conducted and Radiated Emissions. AC conducted emissions were tested at 120V/60Hz and 240V/50Hz, with 120V/60Hz being the worst case. Power line conducted emissions worst case was TX (1Mbps-High Channel). Radiated emissions worst case was TX (1Mbps-High Channel). Pre-test AC conducted emission at charge was performed in 1Mbps-High Channel mode.
2. TEST METHODOLOGY
Tests were performed in accordance with ANSI C63.10-2013, FCC CFR PART 15C 15.207, 15.209 and 15.247.
2.1 EUT Configuration
The EUT was configured for RF field strength measurement to maximize emission characteristics in a continuous normal application.
2.2 EUT Exercise
The system was configured for continuous transmission and channel changes via software.
2.3 General Test Procedures
2.3.1 Conducted Emissions
EUT placed on a turntable 0.8m above ground. Measurements from 0.15 MHz to 30MHz using Quasi-peak and average detectors.
2.3.2 Radiated Emissions
EUT on turntable (0.8m below 1GHz, 1.5m above 1GHz). Turntable rotated 360 degrees. Antenna 3m away, varied 1m to 4m. Polarization (horizontal/vertical) adjusted for maximum emission. Exploratory measurements made per Section 6.4 of ANSI C63.10-2013.
2.4. Test Sample
Two samples were provided: Engineer sample (continuous transmit) and Normal sample (intermittent transmit).
3. SYSTEM TEST CONFIGURATION
3.1 Justification
System configured for continuous transmits.
3.2 EUT Exercise Software
Software 'FCC_assist_1.0.2.2' used for continuous transmission and channel changes.
3.3 Special Accessories
No special accessories were listed.
3.4 Block Diagram/Schematics
Refer to the related document.
3.5 Equipment Modifications
No modifications were made to the EUT by the laboratory.
3.6 Test Setup
Refer to test setup photos (not included in this document).
4. SUMMARY OF TEST RESULTS
Tests were performed according to FCC Part 15 Subpart C. Results are summarized below:
| FCC Rules | Description of Test | Test Sample | Result | Remark |
|---|---|---|---|---|
| §15.247(a) | 20dB Bandwidth | Sample 1 | Compliant | Appendix A.1 |
| §15.247(b)(1) | Maximum Peak Conducted Output Power | Sample 1 | Compliant | Appendix A.2 |
| §15.247(a)(1) | Frequency Separation | Sample 1 | Compliant | Appendix A.3 |
| §15.247(a)(1) | Time Of Occupancy (Dwell Time) | Sample 1 | Compliant | Appendix A.4 |
| §15.247(a)(1) | Number Of Hopping Frequency | Sample 1 | Compliant | Appendix A.5 |
| §15.209(a) | Radiated Spurious Emissions | Sample 1, Sample 2 | Compliant | Note 1 |
| §15.247(d) | Band Edges Measurements and Conducted Spurious Emissions | Sample 1 | Compliant | Appendix A.6, Appendix A.7 |
| / | On Time and Duty Cycle | Sample 1 | / | Only reported; Appendix A.8 |
| §15.205 | Emissions at Restricted Band | Sample 1 | Compliant | Appendix A.8 |
| §15.207(a) | AC Mains Conducted Emissions | Sample 1, Sample 2 | Compliant | Appendix A.9 |
| §15.203 | Antenna Requirements | Sample 1 | Compliant | Note 1 |
| §15.247(i)§1.1310 | RF Exposure | N/A | Compliant | Note 2 |
Note 1: Test results inside test report.
Note 2: Test results in other test report (RF Exposure report).
5. SUMMARY OF TEST EQUIPMENT
The following equipment was used for testing:
| Item | Equipment | Manufacturer | Model No. | Serial No. | Cal Date | Due Date |
|---|---|---|---|---|---|---|
| 1 | Power Meter | R&S | NRVS | 100444 | 2023-06-09 | 2024-06-08 |
| 2 | Power Sensor | R&S | NRV-Z81 | 100458 | 2023-06-09 | 2024-06-08 |
| 3 | Power Sensor | R&S | NRV-Z32 | 10057 | 2023-06-09 | 2024-06-08 |
| 4 | Test Software | Tonscend | JS1120-2 | / | N/A | N/A |
| 5 | RF Control Unit | Tonscend | JS0806-2 | N/A | 2023-08-15 | 2024-08-14 |
| 6 | MXA Signal Analyzer | Agilent | N9020A | MY50510140 | 2023-10-18 | 2024-10-17 |
| 7 | DC Power Supply | Agilent | E3642A | N/A | 2023-10-18 | 2024-10-17 |
| 8 | EMI Test Software | AUDIX | E3 | / | N/A | N/A |
| 9 | 3m Semi Anechoic Chamber | SIDT FRANKONIA | SAC-3M | 03CH03-HY | 2023-06-09 | 2024-06-08 |
| 10 | Positioning Controller | Max-Full | MF7802BS | MF780208586 | N/A | N/A |
| 11 | Active Loop Antenna | SCHWARZBECK | FMZB 1519B | 00005 | 2021-08-29 | 2024-08-28 |
| 12 | By-log Antenna | SCHWARZBECK | VULB9163 | 9163-470 | 2021-09-12 | 2024-09-11 |
| 13 | Horn Antenna | SCHWARZBECK | BBHA 9120D | 9120D-1925 | 2021-09-05 | 2024-09-04 |
| 14 | Broadband Horn Antenna | SCHWARZBECK | BBHA 9170 | 791 | 2021-08-29 | 2024-08-28 |
| 15 | Broadband Preamplifier | SCHWARZBECK | BBV9719 | 9719-025 | 2021-08-29 | 2024-08-28 |
| 16 | EMI Test Receiver | R&S | ESR 7 | 101181 | 2023-08-15 | 2024-08-14 |
| 17 | RS SPECTRUM ANALYZER | R&S | FSP40 | 100503 | 2023-07-17 | 2024-07-16 |
| 18 | Low-frequency amplifier | SchwarzZBECK | BBV9745 | 00253 | 2023-10-18 | 2024-10-17 |
| 19 | High-frequency amplifier | JS Denki Pte | PA0118-43 | JSPA21009 | 2023-10-18 | 2024-10-17 |
| 20 | 6dB Attenuator | / | 100W/6dB | 1172040 | 2023-06-09 | 2024-06-08 |
| 21 | 3dB Attenuator | / | 2N-3dB | / | 2023-10-18 | 2024-10-17 |
| 22 | EMI Test Receiver | R&S | ESPI | 101940 | 2023-08-15 | 2024-08-14 |
| 23 | Artificial Mains | R&S | ENV216 | 101288 | 2023-06-09 | 2024-06-08 |
| 24 | 10dB Attenuator | SCHWARZBECK | MTS-IMP-136 | 261115-001-0032 | 2023-06-09 | 2024-06-08 |
| 25 | EMI Test Software | Farad | EZ | / | N/A | N/A |
| 26 | Antenna Mast | Max-Full | MFA-515BSN | 1308572 | N/A | N/A |
6. MEASUREMENT RESULTS
6.1. Frequency Separation and 20 dB Bandwidth
6.1.1 Limit
Frequency hopping systems shall have hopping channel carrier frequencies separated by a minimum of 25 kHz or the 20 dB bandwidth of the hopping channel, whichever is greater. Systems in the 2400-2483.5 MHz band may use 25 kHz or two-thirds of the 20 dB bandwidth, provided output power is no greater than 125 mW.
6.1.2 Block Diagram of Test Setup
A diagram shows a spectrum analyzer connected via an RF cable to the EUT.
6.1.3 Test Procedure
Frequency separation: Place EUT in transmit mode, connect EUT antenna port to Spectrum Analyzer. Set center frequency to middle of hopping channel. Set RBW = 30 kHz, VBW = 100 kHz, Span wide enough to capture adjacent channels. Sweep auto. Max hold and record peak frequencies.
20dB bandwidth: Set Span approximately 2-3 times the 20 dB bandwidth, centered on a hopping channel. Set RBW ≥1% of 20 dB bandwidth, VBW ≥RBW. Detector peak. Trace max hold.
6.1.4 Test Results
6.1.4.1 20dB Bandwidth
PASS. Refer to Appendix A.1. Test results include cable loss. Measured at difference Packet Type for each mode, worst case recorded. Worst case data at DH5 (GFSK), 2DH5 (π/4-DQPSK), 3DH5 (8-DPSK).
6.1.4.2 Frequency Separation
PASS. Refer to Appendix A.3.
6.2. Peak Power
6.2.1 Block Diagram of Test Setup
A diagram shows a spectrum analyzer connected via an RF cable to the EUT.
6.2.2 Limit
For systems operating in the 2400–2483.5 MHz band with at least 75 non-overlapping channels: 1 watt. For other systems in this band: 0.125 watts.
6.2.3 Test Procedure
Transmitter output connected to the spectrum analyzer.
6.2.4. Test Procedures
Set Span approx. five times the 20 dB bandwidth, centered on a hopping channel. RBW > 20 dB bandwidth. VBW ≥ RBW. Sweep auto. Detector peak. Trace max hold.
6.2.5 Test Results
PASS. Refer to Appendix A.2. Test results include cable loss. Measured output power at difference Packet Type for each mode, worst case recorded.
6.3. Time of Occupancy (Dwell Time)
6.3.1 Limit
Average time of occupancy on any channel shall not be greater than 0.4s within a period of 0.4s multiplied by the number of hopping channels employed.
6.3.2 Block Diagram of Test Setup
A diagram shows a spectrum analyzer connected via an RF cable to the EUT.
6.3.3 Test Procedure
Place EUT in transmit mode. Connect EUT antenna port to Spectrum Analyzer. Set center frequency to operating frequency. Set RBW=1MHz, VBW=3MHz, Span = 0Hz, Sweep = auto. Repeat for all frequencies.
6.3.4 Test Results
Dwell Time = Burst Width * Total Hops. PASS. Refer to Appendix A.4. Test results include cable loss. Measured at difference Packet Type for each mode, worst case recorded.
6.4. Number of Hopping Frequency
6.4.1 Limit
Frequency hopping systems operating in the 2400-2483.5 MHz band shall use at least 15 hopping channels.
6.4.2 Block Diagram of Test Setup
A diagram shows a spectrum analyzer connected via an RF cable to the EUT.
6.4.3 Test Procedure
Place EUT in transmit mode. Connect EUT antenna port to Spectrum Analyzer. Set Start=2400MHz, Stop = 2483.5MHz, Sweep = auto. Set RBW=100KHz, VBW=300KHz. Max hold, view and count channels.
6.4.4 Test Results
PASS. Refer to Appendix A.5. Test results include cable loss. Measured number of hopping channels at difference Packet Type for each mode, worst case recorded. Worst case data at DH5 (GFSK), 2DH5 (π/4-DQPSK), 3DH5 (8-DPSK).
6.5. Band Edges Measurements and Conducted Spurious Emissions Test
6.5.1 Limit
In any 100 kHz bandwidth outside the operating frequency band, RF power shall be at least 20 dB below the level in the 100 kHz bandwidth within the band containing the highest desired power. Attenuation below general limits in Section 15.209(a) is not required.
6.5.2 Block Diagram of Test Setup
A diagram shows a spectrum analyzer connected via an RF cable to the EUT.
6.5.3 Test Procedure
Conducted RF measurements confirm EUT antenna port emissions meet limits. Set Spectrum Analyzer RBW=100 KHz, VBW=300 KHz. Measurements made over 30 MHz to 26.5GHz range at lowest, middle, and highest channels.
6.5.4 Test Results of Conducted Spurious Emissions
No non-compliance noted. PASS. Refer to Appendix A.6 for Band Edges Measurements and Appendix A.7 for Conducted Spurious Emission. Test results include cable loss. Measured at difference Packet Type for each mode, worst case recorded. Worst case data at DH5 (GFSK), 2DH5 (π/4-DQPSK), 3DH5 (8-DPSK).
6.6. Restricted Band Emission Limit
6.6.1. Standard Applicable
FCC §15.205 (a) lists restricted frequency bands. Emissions in these bands must comply with §15.209(a) limits. §15.247 (d) requires 20dBc attenuation outside the operating band, but if emissions fall into restricted bands, §15.209(a) limits apply.
6.6.2. Measuring Instruments and Setting
Refer to equipment list. Spectrum analyzer and receiver settings are detailed in the original document.
6.6.3. Test Procedures
Sequence of testing 9 kHz to 30 MHz: Setup involves turntable, EUT, and spectrum analyzer/receiver. Pre-measurement involves rotating turntable and adjusting antenna height (1.0m). Final measurement maximizes emissions with QPK detector.
Sequence of testing 30 MHz to 1 GHz: Setup involves turntable, EUT, antenna tower, bi-log antenna, spectrum analyzer/receiver. Pre-measurement involves rotating turntable (0-315° in 45° steps), adjusting antenna polarization (vertical/horizontal) and height (1-4m). Final measurement performed with minimum six highest peaks, QP detector.
Sequence of testing 1 GHz to 18 GHz: Setup involves turntable, EUT, antenna tower, horn antenna, spectrum analyzer/receiver. Pre-measurement involves rotating turntable, adjusting antenna polarization and height (1-4m). Final measurement performed with minimum six highest peaks, Peak and Average detectors.
Sequence of testing above 18 GHz: Setup involves turntable, EUT, and spectrum analyzer/receiver. Pre-measurement involves spherical movement of the antenna. Final measurement performed at positions and orientations yielding detected emissions with Peak and Average detectors.
6.6.4. Test Setup Layout
Diagrams illustrate test setups for frequency ranges below 30MHz, below 1GHz, and above 10GHz. For above 10GHz, extrapolation factor of 20 dB/decade from 3m to 1.5m is used.
6.6.5. EUT Operation during Test
EUT programmed for continuously transmitting mode.
6.6.6. Field Strength Calculation
Field strength is calculated as: FS (dBuV/m) = RA (dBuV) + AF (dB/m) + CL (dB) – AG (dB), where RA is Reading Amplitude, AF is Antenna Factor, CL is Cable Loss, and AG is Amplifier Gain.
6.6.7. Results of Radiated Emissions (9 KHz~30MHz)
Temperature: 23.8°C, Test Engineer: Paddi Chen, Humidity: 52.1%, Configurations: BT. Spurious emissions attenuated by more than 20 dB below the permissible value were not reported.
6.6.7. Results of Radiated Emissions (30 MHz~1000 MHz)
PASS. Test data refers to the following page. Temperature: 23.8°C, Test Engineer: Paddi Chen, Humidity: 52.1%, Configurations: BT.
(Tables and plots for Horizontal and Vertical emissions are presented in the original document, showing frequency, level, limit, margin, and detector type.)
6.6.9. Results of Radiated Emissions (1 GHz~26.5 GHz)
Results for GFSK, π/4-DQPSK, and 8-DPSK modulation types across different channels (0, 39, 78) are presented in tables, showing frequency, reading, antenna factor, pre-amplifier factor, cable loss, measured level, limit, margin, and polarization (Horizontal/Vertical). All modes were tested and worst-case recorded.
6.7. AC Power Line Conducted Emissions
6.7.1 Standard Applicable
FCC §15.207 (a): RF voltage conducted back onto AC power line within 150 kHz to 30 MHz shall not exceed 250 microvolts. Limits are provided for Quasi-peak and Average detectors across frequency ranges.
6.7.2 Block Diagram of Test Setup
Diagram shows EUT, LISN, and EMI receiver setup.
6.7.3 Disturbance Calculation
Conducted Disturbance (CD) = Reading Amplitude (RA) + Pulse Limiter (PL) + Cable Loss (CL).
6.7.3 Test Results
PASS. Temperature: 24.4°C, Test Engineer: Paddi Chen, Humidity: 53.0%, Configurations: BT. Data presented in tables and plots for Line and Neutral (not included here).
6.8. On Time and Duty Cycle
6.8.1. Standard Applicable
None specified for reporting purpose.
6.8.2. Measuring Instruments and Setting
Refer to equipment list. Spectrum analyzer settings provided.
6.8.3. Test Procedures
Set spectrum analyzer center frequency, span=0MHz, RBW=1.0MHz, VBW=3.0MHz, Sweep time=Auto. Detector=peak, Trace mode=Single hold.
6.8.4. Test Setup Layout
Diagram shows a spectrum analyzer connected via an RF cable to the EUT.
6.8.5. EUT Operation during Test
EUT programmed for continuously transmitting mode.
6.8.6. Test result
For reporting purpose only. Refer to Appendix A.8.
6.9. Emissions in Restricted Bands
6.9.1 Standard Applicable
RF power outside the operating band must be at least 20 dB below the level in the 100 kHz bandwidth within the band. If transmitter uses RMS averaging, attenuation is 30 dB. Emissions in restricted bands must comply with §15.209(a) limits.
6.9.2. Test Setup Layout
Diagram shows a spectrum analyzer connected via an RF cable to the EUT.
6.9.3. Measuring Instruments and Setting
Refer to equipment list. Spectrum Analyzer settings provided.
6.9.4. Test Procedures
Check instrument calibration. Connect EUT to receiver. Set frequencies, RBW/VBW. Measure highest amplitude. Plot graph. Repeat until all frequencies complete.
6.9.5. Test Results
PASS. Refer to Appendix A.9. Measured at difference Packet Type for each mode, worst case recorded. Worst case data at DH5 (GFSK), 2DH5 (π/4-DQPSK), 3DH5 (8-DPSK). Measured at Hopping and Non-Hopping mode, worst at Non-Hopping. Other emission levels were low. Average measurement not performed if peak data was below average limit.
6.10. Pseudorandom Frequency Hopping Sequence
6.10.1 Standard Applicable
Frequency hopping systems shall have hopping channel carrier frequencies separated by a minimum of 25 kHz or the 20 dB bandwidth, whichever is greater. Systems in the 2400–2483.5 MHz band may use 25 kHz or two-thirds of the 20 dB bandwidth, provided output power is no greater than 125 mW. Frequencies are selected from a pseudo randomly ordered list. Each frequency must be used equally on average. Receivers must match transmitter bandwidths and shift frequencies synchronously.
6.10.2 EUT Pseudorandom Frequency Hopping Sequence Requirement
Sequence generated by a nine-stage shift register. Example: shift register initialized with nine ones. Number of shift register stages: 9. Length of pseudo-random sequence: 2^9-1=511 bits. Longest sequence of zeros: 8 (non-inverted signal).
Linear Feedback Shift Register for Generation of the PRBS sequence
A block diagram illustrates a linear feedback shift register with stages and connections, followed by an example sequence of numbers (0 2 4 6 ... 73 75 77).
6.11. Antenna Requirement
6.11.1 Standard Applicable
FCC §15.203: Intentional radiators must use the furnished antenna or one with a unique coupling. Standard antenna jacks or electrical connectors are prohibited. §15.247(4)(1) allows directional gain over 6dBi for fixed point-to-point operations if peak output power is reduced by 1 dB for every 3 dB of gain exceeding 6dBi.
6.11.2 Antenna Connected Construction
6.11.2.1. Standard Applicable
FCC §15.203 & RSS-Gen: Intentional radiators must use the furnished antenna.
6.11.2.2. Antenna Connector Construction
Directional gain of antenna used for transmitting is 1.7dBi(Max). It is a PCB Antenna connected to the PCB board with no consideration for replacement.
