FBL528 Bluetooth Earphone Test Report FCC Part 15.247B Dongguan Kingtron Tech. Co., Ltd.

Dongguan Kingtron Tech. Co., Ltd. Bluetooth Earphone

FCC ID Filing: 2AKSRFBL528
Purchase on Amazon: Bluetooth Earphone

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Model: FBL528
FCC Part 15C
Measurement and Test Report
For
Dongguan Kingtron Tech. Co., Ltd.
No.3 Fuming North Rd, Shu'an Industrial Park, Shu'tian, Humen Town,
Dongguan, China
FCC ID: 2AKSRFBL528
FCC Rule(s):
FCC Part 15.247
Product Description:
Bluetooth Earphone
Tested Model:
FBL528
Report No.:
STR16128279I-1
Tested Date:
2016-06-12 to 2016-06-20
Issued Date:
2016-12-29
Tested By:
Jong Wang / Engineer
Reviewed By:
Silin Chen / EMC Manager
Approved & Authorized By:
Jandy so / PSQ Manager
Prepared By:
Shenzhen SEM.Test Technology Co., Ltd.
1/F, Building A, Hongwei Industrial Park, Liuxian 2nd Road,
Bao'an District, Shenzhen, P.R.C.(518101)
Tel.: +86-755-33663308 Fax.: +86-755-33663309 Website: www.semtest.com.cn
Note: This test report is limited to the above client company and the product model only. It
may not be duplicated without prior permitted by Shenzhen SEM.Test Technology Co., Ltd.
REPORT NO.: STR16128279I-1
PAGE 1 OF 54
FCC PART 15.247
Model: FBL528
TABLE OF CONTENTS
1. GENERAL INFORMATION ...................................................................................................................................4
1.1 PRODUCT DESCRIPTION FOR EQUIPMENT UNDER TEST (EUT) ...............................................................................4
1.2 TEST STANDARDS...................................................................................................................................................5
1.3 TEST METHODOLOGY .............................................................................................................................................5
1.4 TEST FACILITY .......................................................................................................................................................5
1.5 EUT SETUP AND TEST MODE .................................................................................................................................6
1.6 MEASUREMENT UNCERTAINTY ..............................................................................................................................7
1.7 TEST EQUIPMENT LIST AND DETAILS .....................................................................................................................7
2. SUMMARY OF TEST RESULTS ...........................................................................................................................8
3. RF EXPOSURE .........................................................................................................................................................9
3.1 STANDARD APPLICABLE.........................................................................................................................................9
3.2 TEST RESULT..........................................................................................................................................................9
4. ANTENNA REQUIREMENT ................................................................................................................................10
4.1 STANDARD APPLICABLE.......................................................................................................................................10
4.2 EVALUATION INFORMATION ................................................................................................................................10
5. FREQUENCY HOPPING SYSTEM REQUIREMENTS ...................................................................................11
5.1 STANDARD APPLICABLE.......................................................................................................................................11
5.2 FREQUENCY HOPPING SYSTEM.............................................................................................................................11
5.3 EUT PSEUDORANDOM FREQUENCY HOPPING SEQUENCE ....................................................................................12
6. QUANTITY OF HOPPING CHANNELS AND CHANNEL SEPARATION ...................................................13
6.1 STANDARD APPLICABLE.......................................................................................................................................13
6.2 TEST PROCEDURE .................................................................................................................................................13
6.3 ENVIRONMENTAL CONDITIONS ............................................................................................................................13
6.4 SUMMARY OF TEST RESULTS/PLOTS ....................................................................................................................14
7. DWELL TIME OF HOPPING CHANNEL ..........................................................................................................18
7.1 STANDARD APPLICABLE.......................................................................................................................................18
7.2 TEST PROCEDURE .................................................................................................................................................18
7.3 ENVIRONMENTAL CONDITIONS ............................................................................................................................18
7.4 SUMMARY OF TEST RESULTS/PLOTS ....................................................................................................................19
8. 20DB BANDWIDTH ...............................................................................................................................................29
8.1 STANDARD APPLICABLE.......................................................................................................................................29
8.2 TEST PROCEDURE .................................................................................................................................................29
8.3 ENVIRONMENTAL CONDITIONS ............................................................................................................................29
8.4 SUMMARY OF TEST RESULTS/PLOTS ....................................................................................................................29
9. RF OUTPUT POWER ............................................................................................................................................33
9.1 STANDARD APPLICABLE.......................................................................................................................................33
9.2 TEST PROCEDURE .................................................................................................................................................33
9.3 ENVIRONMENTAL CONDITIONS ............................................................................................................................33
9.4 SUMMARY OF TEST RESULTS/PLOTS ....................................................................................................................33
10. FIELD STRENGTH OF SPURIOUS EMISSIONS ...........................................................................................35
10.1 STANDARD APPLICABLE.....................................................................................................................................35
10.2 TEST PROCEDURE ...............................................................................................................................................35
10.3 CORRECTED AMPLITUDE & MARGIN CALCULATION ..........................................................................................36
10.4 ENVIRONMENTAL CONDITIONS ..........................................................................................................................36
10.5 SUMMARY OF TEST RESULTS/PLOTS ..................................................................................................................37
11. OUT OF BAND EMISSIONS ...............................................................................................................................44
11.1 STANDARD APPLICABLE.....................................................................................................................................44
11.2 TEST PROCEDURE ...............................................................................................................................................44
11.3 ENVIRONMENTAL CONDITIONS ..........................................................................................................................45
11.4 SUMMARY OF TEST RESULTS/PLOTS ..................................................................................................................45
12. CONDUCTED EMISSIONS ................................................................................................................................51
12.1 TEST PROCEDURE ...............................................................................................................................................51
REPORT NO.: STR16128279I-1
PAGE 2 OF 54
FCC PART 15.247
Model: FBL528
12.2 BASIC TEST SETUP BLOCK DIAGRAM .................................................................................................................51
12.3 ENVIRONMENTAL CONDITIONS ..........................................................................................................................51
12.4 TEST RECEIVER SETUP .......................................................................................................................................52
12.5 SUMMARY OF TEST RESULTS/PLOTS ..................................................................................................................52
12.6 CONDUCTED EMISSIONS TEST DATA ..................................................................................................................52
REPORT NO.: STR16128279I-1
PAGE 3 OF 54
FCC PART 15.247
Model: FBL528
1. GENERAL INFORMATION
1.1 Product Description for Equipment Under Test (EUT)
Client Information
Applicant:
Address of applicant:
Manufacturer:
Address of manufacturer:
Dongguan Kingtron Tech. Co., Ltd.
No.3 Fuming North Rd, Shu'an Industrial Park, Shu'tian,
Humen Town, Dongguan, China
Dongguan Kingtron Tech. Co., Ltd.
No.3 Fuming North Rd, Shu'an Industrial Park, Shu'tian,
Humen Town, Dongguan, China
General Description of EUT
Product Name:
Bluetooth Earphone
Trade Name:
Model No.:
FBL528
Adding Model(s):
FBL206, FBL209, FBL216, FBL219, FBL518, FBL809
Rated Voltage:
DC 3.7V Battery; USB 5V charging purpose only
Note: The test data is gathered from a production sample provided by the manufacturer. The appearance of
others models listed in the report is different from main-test model FBL528, but the circuit and the
electronic construction do not change, declared by the manufacturer.
Technical Characteristics of EUT
Bluetooth Version:
Frequency Range:
RF Output Power:
Data Rate:
Modulation:
Quantity of Channels:
Channel Separation:
Type of Antenna:
Antenna Gain:
Lowest Internal Frequency of EUT:
REPORT NO.: STR16128279I-1
V4.0 (EDR Mode)
2402-2480MHz
6.213 dBm (Conducted)
1Mbps, 2Mbps, 3Mbps
GFSK, Pi/4 QDPSK, 8DPSK
79
1MHz
Chip Antenna
2 dBi
26MHz
PAGE 4 OF 54
FCC PART 15.247
Model: FBL528
1.2 Test Standards
The following report is prepared on behalf of the Dongguan Kingtron Tech. Co., Ltd. in accordance with FCC Part
15, Subpart C, and section 15.203, 15.205, 15.207, 15.209 and 15.247 of the Federal Communication
Commissions rules.
The objective is to determine compliance with FCC Part 15, Subpart C, and section 15.203, 15.205, 15.207,
15.209 and 15.247 of the Federal Communication Commissions rules.
Maintenance of compliance is the responsibility of the manufacturer. Any modification of the product, which
result in lowering the emission, should be checked to ensure compliance has been maintained.
1.3 Test Methodology
All measurements contained in this report were conducted with ANSI C63.10-2013, American National Standard
for Testing Unlicensed Wireless Devices, and ANSI C63.4-2014, American National Standard for Methods of
Measurement of Radio-Noise Emissions from Low-Voltage Electrical and Electronic Equipment in the range of 9
kHz to 40 GHz. The measurement guide DA 00-705 for frequency hopping spread spectrum systems shall be
performed also.
1.4 Test Facility
FCC – Registration No.: 934118
Shenzhen SEM.Test Technology Co., Ltd. EMC Laboratory has been registered and fully described in a report
filed with the (FCC) Federal Communications Commission. The acceptance letter from the FCC is maintained in
our files and the Registration is 934118.
Industry Canada (IC) Registration No.: 11464A
The 3m Semi-anechoic chamber of Shenzhen SEM.Test Technology Co., Ltd. has been registered by Certification
and Engineering Bureau of Industry Canada for radio equipment testing with Registration No.: 11464A.
CNAS Registration No.: L4062
Shenzhen SEM.Test Technology Co., Ltd. is a testing organization accredited by China National Accreditation
Service for Conformity Assessment (CNAS) according to ISO/IEC 17025. The accreditation certificate number is
L4062. All measurement facilities used to collect the measurement data are located at 1/F, Building A, Hongwei
Industrial Park, Liuxian 2nd Road, Bao’an District, Shenzhen, P.R.C (518101).
REPORT NO.: STR16128279I-1
PAGE 5 OF 54
FCC PART 15.247
Model: FBL528
1.5 EUT Setup and Test Mode
The EUT was operated in the engineering mode to fix the Tx frequency that was for the purpose of the
measurements. All testing shall be performed under maximum output power condition, and to measure its highest
possible emissions level, more detailed description as follows:
Test Mode List
Test Mode
Description
Remark
TM1
Low Channel
2402MHz
TM2
Middle Channel
2441MHz
TM3
High Channel
2480MHz
TM4
Hopping
2402-2480MHz
Modulation Configure
Modulation
GFSK
Pi/4 DQPSK
8DPSK
Packet
Packet Type
Packet Size
DH1
27
DH3
11
183
DH5
15
339
2DH1
20
54
2DH3
26
367
2DH5
30
379
3DH1
24
83
3DH3
27
552
3DH5
31
1021
Normal mode: the Bluetooth has been tested on the modulation of GFSK, (Pi/4)DQPSK and
8DPSK, compliance test and record the worst case.
EUT Cable List and Details
Cable Description
Length (m)
Shielded/Unshielded
With / Without Ferrite
Cable Description
Length (m)
Shielded/Unshielded
With / Without Ferrite
USB Cable
0.4
Shielded
Without Ferrite
Special Cable List and Details
Auxiliary Equipment List and Details
Description
Manufacturer
Model
Serial Number
Notebook
Lenovo
E10
LR-63C8R
REPORT NO.: STR16128279I-1
PAGE 6 OF 54
FCC PART 15.247
Model: FBL528
1.6 Measurement Uncertainty
Measurement uncertainty
Parameter
Conditions
Uncertainty
RF Output Power
Conducted
±0.42dB
Occupied Bandwidth
Conducted
±1.5%
Conducted Spurious Emission
Conducted
±2.17dB
Conducted Emissions
Conducted
±2.88dB
Transmitter Spurious Emissions
Radiated
±5.1dB
1.7 Test Equipment List and Details
No.
SEMT-1072
Description
Spectrum Analyzer
Manufacturer
Agilent
Model
E4407B
Serial No.
MY41440400
Cal Date Due Date
2016-06-04 2017-06-03
SEMT-1031
Spectrum Analyzer
Rohde & Schwarz
FSP30
836079/035
2016-06-04 2017-06-03
SEMT-1007
EMI Test Receiver
Rohde & Schwarz
ESVB
825471/005
2016-06-04 2017-06-03
SEMT-1008
Amplifier
Agilent
8447F
3113A06717
2016-06-04 2017-06-03
SEMT-1043
Amplifier
C&D
PAP-1G18
2002
2016-06-04 2017-06-03
SEMT-1011
Broadband Antenna
Schwarz beck
VULB9163
9163-333
2016-06-04 2017-06-03
SEMT-1042
Horn Antenna
ETS
3117
00086197
2016-06-04 2017-06-03
SEMT-1121
Horn Antenna
ETS
3116B
00088203
2016-06-04 2017-06-03
SEMT-1069
Loop Antenna
Schwarz beck
FMZB 1516
9773
2016-06-04 2017-06-03
SEMT-1001
EMI Test Receiver
Rohde & Schwarz
ESPI
101611
2016-06-04 2017-06-03
SEMT-1003
L.I.S.N
Schwarz beck
NSLK8126
8126-224
2016-06-04 2017-06-03
SEMT-1002
Pulse Limiter
Rohde & Schwarz
ESH3-Z2
100911
2016-06-04 2017-06-03
REPORT NO.: STR16128279I-1
PAGE 7 OF 54
FCC PART 15.247
Model: FBL528
2. SUMMARY OF TEST RESULTS
FCC Rules
Description of Test Item
Result
§ 2.1093
RF Exposure
Compliant
§15.203;§15.247(b)(4)(i)
Antenna Requirement
Compliant
§15.205
Restricted Band of Operation
Compliant
§15.207(a)
Conducted Emission
Compliant
§15.209(a)
Radiated Spurious Emissions
Compliant
§15.247(a)(1)(iii)
Quantity of Hopping Channel
Compliant
§15.247(a)(1)
Channel Separation
Compliant
§15.247(a)(1)(iii)
Time of Occupancy (Dwell time)
Compliant
§15.247(a)
20dB Bandwidth
Compliant
§15.247(b)(1)
RF Power Output
Compliant
§15.247(d)
Band Edge (Out of Band Emissions)
Compliant
§15.247(a)(1)
Frequency Hopping Sequence
Compliant
§15.247(g), (h)
Frequency Hopping System
Compliant
Note: This device is all the same as FCC ID: 2AFGOA880BL, so all the data were copied from this FCC ID.
REPORT NO.: STR16128279I-1
PAGE 8 OF 54
FCC PART 15.247
Model: FBL528
3. RF Exposure
3.1 Standard Applicable
According to§1.1307 and §2.1093, the portable transmitter must comply the RF exposure requirements.
3.2 Test Result
This product complied with the requirement of the RF exposure, please see the RF Exposure Report.
REPORT NO.: STR16128279I-1
PAGE 9 OF 54
FCC PART 15.247
Model: FBL528
4. Antenna Requirement
4.1 Standard Applicable
According to FCC Part 15.203, an intentional radiator shall be designed to ensure that no antenna other than that
furnished by the responsible party shall be used with the device. The use of a permanently attached antenna or of
an antenna that uses a unique coupling to the intentional radiator shall be considered sufficient to comply with the
provisions of this section.
4.2 Evaluation Information
This product has a chip antenna, fulfill the requirement of this section.
REPORT NO.: STR16128279I-1
PAGE 10 OF 54
FCC PART 15.247
Model: FBL528
5. Frequency Hopping System Requirements
5.1 Standard Applicable
According to FCC Part 15.247(a)(1), The system shall hop to channel frequencies that are selected at the system
hopping rate from a pseudo randomly ordered list of hopping frequencies. Each frequency must be used equally
on the average by each transmitter. The system receivers shall have input bandwidths that match the hopping
channel bandwidths of their corresponding transmitters and shall shift frequencies in synchronization with the
transmitted signals.
(g) Frequency hopping spread spectrum systems are not required to employ all available hopping channels during
each transmission. However, the system, consisting of both the transmitter and the receiver, must be designed to
comply with all of the regulations in this section should the transmitter be presented with a continuous data (or
information) stream. In addition, a system employing short transmission bursts must comply with the definition of
a frequency hopping system and must distribute its transmissions over the minimum number of hopping channels
specified in this section.
(h) The incorporation of intelligence within a frequency hopping spread spectrum system that permits the system
to recognize other users within the spectrum band so that it individually and independently chooses and adapts its
hopsets to avoid hopping on occupied channels is permitted. The coordination of frequency hopping systems in
any other manner for the express purpose of avoiding the simultaneous occupancy of individual hopping
frequencies by multiple transmitters is not permitted.
5.2 Frequency Hopping System
This transmitter device is frequency hopping device, and complies with FCC part 15.247 rule.
This device uses Bluetooth radio which operates in 2400-2483.5 MHz band. Bluetooth uses a radio technology
called frequency-hopping spread spectrum, which chops up the data being sent and transmits chunks of it on up to
79 bands (1 MHz each; centred from 2402 to 2480 MHz) in the range 2,400-2,483.5 MHz. The transmitter
switches hop frequencies 1,600 times per second to assure a high degree of data security. All Bluetooth devices
participating in a given piconet are synchronized to the frequency-hopping channel for the piconet. The frequency
hopping sequence is determined by the master's device address and the phase of the hopping sequence (the
frequency to hop at a specific time) is determined by the master's internal clock. Therefore, all slaves in a piconet
must know the master's device address and must synchronize their clocks with the master's clock.
Adaptive Frequency Hopping (AFH) was introduced in the Bluetooth specification to provide an effective way for
a Bluetooth radio to counteract normal interference. AFH identifies "bad" channels, where either other wireless
devices are interfering with the Bluetooth signal or the Bluetooth signal is interfering with another device. The
AFH-enabled Bluetooth device will then communicate with other devices within its piconet to share details of any
identified bad channels. The devices will then switch to alternative available "good" channels, away from the
areas of interference, thus having no impact on the bandwidth used.
REPORT NO.: STR16128279I-1
PAGE 11 OF 54
FCC PART 15.247
Model: FBL528
This device was tested with an bluetooth system receiver to check that the device maintained hopping
synchronization, and the device complied with these requirements for DA 00-705 and FCC Part 15.247 rule.
5.3 EUT Pseudorandom Frequency Hopping Sequence
Pseudorandom Frequency Hopping Sequence Table as below:
Channel: 08, 24, 40, 56, 40, 56, 72, 09, 01, 09, 33, 41, 33, 41, 65, 73, 53, 69, 06, 22, 04, 20, 36, 52, 38, 46, 70, 78,
68, 76, 21, 29, 10, 26, 42, 58, 44, 60, 76, 13, 03, 11, 35, 43, 37, 45, 69, 77, 55, 71, 08, 24, 08, 24, 40, 56, 40, 48,
72, 01, 72, 01, 25, 33, 12, 28, 44, 60, 42, 58, 74, 11, 05, 13, 37, 45 etc.
The system receiver have input bandwidths that match the hopping channel bandwidths of their corresponding
transmitters and shift frequencies in synchronization with the transmitted signals.
REPORT NO.: STR16128279I-1
PAGE 12 OF 54
FCC PART 15.247
Model: FBL528
6. Quantity of Hopping Channels and Channel Separation
6.1 Standard Applicable
According to FCC 15.247(a)(1), frequency hopping systems operating in the 2400-2483.5 MHz band may have
hopping channel carrier frequencies that are separated by 25 kHz or two-thirds of the 20 dB bandwidth of the
hopping channel, and frequency hopping systems in the 2400-2483.5 MHz band shall use at least 15 channels.
6.2 Test Procedure
According to the DA 00-705, the number of hopping frequencies test method as follows.
Remove the antenna from the EUT and then connect a low loss RF cable from the antenna port to the spectrum
analyzer.
Set span = the frequency band of operation (2400MHz to 2483.5MHz)
RBW ≥ 1% of the span
VBW ≥ RBW
Sweep = auto
Detector function = peak
Trace = max hold
Allow the trace to stabilize, observed the band of 2400MHz to 2483.5MHz, than count it out the number of
channels for comparing with the FCC rules.
The channel spacing test method as follows:
Set span = wide enough to capture the peaks of two adjacent channels
Resolution (or IF) Bandwidth (RBW) ≥ 1% of the span
Video (or Average) Bandwidth (VBW) ≥ RBW
Sweep = auto; Detector function = peak; Trace = max hold
Allow the trace to stabilize. Use the marker-delta function to determine the separation between the peaks of the
adjacent channels. The limit is specified in one of the subparagraphs of this Section. Submit this plot.
6.3 Environmental Conditions
Temperature:
24 C
Relative Humidity:
54
ATM Pressure:
1011 mbar
REPORT NO.: STR16128279I-1
PAGE 13 OF 54
FCC PART 15.247
Model: FBL528
6.4 Summary of Test Results/Plots
No. of Channel = 79
REPORT NO.: STR16128279I-1
PAGE 14 OF 54
FCC PART 15.247
Model: FBL528
For GFSK mode
Channel Spacing (Low CH=1MHz)
Channel Spacing (Middle CH=1MHz)
REPORT NO.: STR16128279I-1
PAGE 15 OF 54
FCC PART 15.247
Model: FBL528
Channel Spacing (High CH=1MHz)
For 8DPSK mode
Channel Spacing (Low CH=1MHz)
REPORT NO.: STR16128279I-1
PAGE 16 OF 54
FCC PART 15.247
Model: FBL528
Channel Spacing (Middle CH=1MHz)
Channel Spacing (High CH=1MHz)
REPORT NO.: STR16128279I-1
PAGE 17 OF 54
FCC PART 15.247
Model: FBL528
7. Dwell Time of Hopping Channel
7.1 Standard Applicable
According to 15.247(a)(1)(iii), Frequency hopping systems in the 2400–2483.5 MHz band shall use at least 15
channels. The average time of occupancy on any channel shall not be greater than 0.4 seconds within a period of
0.4 seconds multiplied by the number of hopping channels employed.
7.2 Test Procedure
According to the DA 00-705, the dwell time of a hopping channel test method as follows.
Remove the antenna from the EUT and then connect a low loss RF cable from the antenna port to the spectrum
analyzer.
Span = zero span, centered on a hopping channel
RBW = 1 MHz
VBW ≥ RBW
Sweep = as necessary to capture the entire dwell time per hopping channel
Detector function = peak
Trace = max hold
Use the marker-delta function to determine the dwell time
7.3 Environmental Conditions
Temperature:
24 C
Relative Humidity:
54
ATM Pressure:
1011 mbar
REPORT NO.: STR16128279I-1
PAGE 18 OF 54
FCC PART 15.247
Model: FBL528
7.4 Summary of Test Results/Plots
The dwell time within a period in data mode is independent from the packet type (packet length).
Test data is corrected with the worse case, which the packet length is DH1, DH3, and DH5.
The test period: T = 0.4 Second * 79 Channel = 31.6 s
Dwell time = time slot length * (Hopping rate / Number of hopping channels) * Period
Modulation
Test Channel
2402MHz
GFSK
2441MHz
2480MHz
2402MHz
8DPSK
2441MHz
2480MHz
Time Slot Length
Dwell Time
Limit
ms
ms
ms
DH1
0.390
124.800
400
DH3
1.640
262.400
400
DH5
2.890
308.267
400
DH1
0.390
124.800
400
DH3
1.640
262.400
400
DH5
2.890
308.267
400
DH1
0.390
124.800
400
DH3
1.640
262.400
400
DH5
2.890
308.267
400
3DH1
0.400
128.000
400
3DH3
1.640
262.400
400
3DH5
2.900
309.333
400
3DH1
0.400
128.000
400
3DH3
1.650
264.000
400
3DH5
2.900
309.333
400
3DH1
0.400
128.000
400
3DH3
1.640
262.400
400
3DH5
2.900
309.333
400
Packet
Please refer to the test plots as below:
REPORT NO.: STR16128279I-1
PAGE 19 OF 54
FCC PART 15.247
Model: FBL528
DH1 time slot (Low, Middle, High Channels)
REPORT NO.: STR16128279I-1
PAGE 20 OF 54
FCC PART 15.247
Model: FBL528
DH3 time slot (Low, Middle, High Channels)
REPORT NO.: STR16128279I-1
PAGE 21 OF 54
FCC PART 15.247
Model: FBL528
REPORT NO.: STR16128279I-1
PAGE 22 OF 54
FCC PART 15.247
Model: FBL528
DH5 time slot (Low, Middle, High Channels)
REPORT NO.: STR16128279I-1
PAGE 23 OF 54
FCC PART 15.247
Model: FBL528
3DH1 time slot (Low, Middle, High Channels)
REPORT NO.: STR16128279I-1
PAGE 24 OF 54
FCC PART 15.247
Model: FBL528
REPORT NO.: STR16128279I-1
PAGE 25 OF 54
FCC PART 15.247
Model: FBL528
3DH3 time slot (Low, Middle, High Channels)
REPORT NO.: STR16128279I-1
PAGE 26 OF 54
FCC PART 15.247
Model: FBL528
3DH5 time slot (Low, Middle, High Channels)
REPORT NO.: STR16128279I-1
PAGE 27 OF 54
FCC PART 15.247
Model: FBL528
REPORT NO.: STR16128279I-1
PAGE 28 OF 54
FCC PART 15.247
Model: FBL528
8. 20dB Bandwidth
8.1 Standard Applicable
According to 15.247(a) and 15.215(c). 20dB bandwidth is recommended that the fundamental emission be kept
within at least the central 80% of the permitted band in order to minimize the possibility of out-of-band operation.
8.2 Test Procedure
According to the DA 00-705, the 20dB bandwidth test method as follows.
Remove the antenna from the EUT and then connect a low loss RF cable from the antenna port to the spectrum
analyzer.
Span = approximately 2 to 3 times the 20 dB bandwidth, centered on a hopping channel
RBW ≥ 1% of the 20 dB bandwidth
VBW ≥ RBW
Sweep = auto; Detector function = peak
Trace = max hold
All the trace to stabilize, use the marker-to-peak function to set the marker to the peak of the emission, use the
marker-delta function to measure and record the 20dB down bandwidth of the emission.
8.3 Environmental Conditions
Temperature:
25 C
Relative Humidity:
53
ATM Pressure:
1018 mbar
8.4 Summary of Test Results/Plots
Test Mode
Test Channel
MHz
20 dB Bandwidth
kHz
99% Bandwidth
kHz
Result
2402
912.4
844.18
Pass
2441
844.5
838.03
Pass
2480
885.2
839.81
Pass
2402
1261.0
1159.7
Pass
2441
1255.0
1158.3
Pass
2480
1255.0
1158.3
Pass
GFSK
8DPSK
REPORT NO.: STR16128279I-1
PAGE 29 OF 54
FCC PART 15.247
Model: FBL528
For GFSK
Low Channel:
Middle Channel:
REPORT NO.: STR16128279I-1
PAGE 30 OF 54
FCC PART 15.247
Model: FBL528
High Channel:
For 8DPSK
Low Channel:
REPORT NO.: STR16128279I-1
PAGE 31 OF 54
FCC PART 15.247
Model: FBL528
Middle Channel:
High Channel:
REPORT NO.: STR16128279I-1
PAGE 32 OF 54
FCC PART 15.247
Model: FBL528
9. RF Output Power
9.1 Standard Applicable
According to 15.247(b)(1). For frequency hopping systems operating in the 2400–2483.5 MHz band employing at
least 75 non-overlapping hopping channels, and all frequency hopping systems in the 5725–5850 MHz band: 1
watt. For all other frequency hopping systems in the 2400–2483.5 MHz band: 0.125 watts.
9.2 Test Procedure
According to the DA 00-705, the peak output power test method as follows.
Remove the antenna from the EUT and then connect a low loss RF cable from the antenna port to the spectrum
analyzer.
Span = approximately 5 times the 20 dB bandwidth, centered on a hopping channel
RBW > the 20 dB bandwidth of the emission being measured
VBW ≥ RBW
Sweep = auto
Detector function = peak
Trace = max hold
All the trace to stabilize, use the marker-to-peak function to set the marker to the peak of the emission, the
indicated level is the peak output power (the external attenuation and cable loss shall be considered).
9.3 Environmental Conditions
Temperature:
24 C
Relative Humidity:
55
ATM Pressure:
1011 mbar
9.4 Summary of Test Results/Plots
REPORT NO.: STR16128279I-1
PAGE 33 OF 54
FCC PART 15.247
Model: FBL528
For GFSK
Channel
Frequency
MHz
Measured Value
dBm
Output Power
mW
Limit
mW
Low Channel
2402
4.734
2.974
1000
Middle Channel
2441
6.213
4.181
1000
High Channel
2480
6.134
4.106
1000
Channel
Frequency
MHz
Measured Value
dBm
Output Power
mW
Limit
mW
Low Channel
2402
2.464
1.764
1000
Middle Channel
2441
4.340
2.716
1000
High Channel
2480
4.225
2.645
1000
Channel
Frequency
MHz
Measured Value
dBm
Output Power
mW
Limit
mW
Low Channel
2402
3.077
2.031
1000
Middle Channel
2441
4.824
3.037
1000
High Channel
2480
4.709
2.957
1000
For Pi/4 QDPSK
For 8DPSK
Note: the antenna gain of 2dBi less than 6dBi maximum permission antenna gain value based on 1 watt peak
output power limit.
REPORT NO.: STR16128279I-1
PAGE 34 OF 54
FCC PART 15.247
Model: FBL528
10. Field Strength of Spurious Emissions
10.1 Standard Applicable
According to §15.247(d), in any 100 kHz bandwidth outside the frequency band in which the spread spectrum or
digitally modulated intentional radiator is operating, the radio frequency power that is produced by the intentional
radiator shall be at least 20 dB below that in the 100 kHz bandwidth within the band that contains the highest level
of the desired power, based on either an RF conducted or a radiated measurement, provided the transmitter
demonstrates compliance with the peak conducted power limits. If the transmitter complies with the conducted
power limits based on the use of RMS averaging over a time interval, as permitted under paragraph (b)(3) of this
section, the attenuation required under this paragraph shall be 30 dB instead of 20 dB. Attenuation below the
general limits specified in §15.209(a) is not required. In addition, radiated emissions which fall in the restricted
bands, as defined in §15.205(a), must also comply with the radiated emission limits specified in §15.209(a).
The emission limit in this paragraph is based on measurement instrumentation employing an average detector. The
provisions in §15.35 for limiting peak emissions apply. Spurious Radiated Emissions measurements starting
below or at the lowest crystal frequency.
10.2 Test Procedure
The setup of EUT is according with per ANSI C63.10-2013 measurement procedure. The specification used was
with the FCC Part 15.205 15.247(a) and FCC Part 15.209 Limit.
The external I/O cables were draped along the test table and formed a bundle 30 to 40 cm long in the middle.
The spacing between the peripherals was 10 cm.
REPORT NO.: STR16128279I-1
PAGE 35 OF 54
FCC PART 15.247
Model: FBL528
Antenna
Tower
1m-4m
3m
EUT SYS
1.5m
Turntable
Table
To EMI Receiver
Ground Plane
Frequency :9kHz-30MHz
RBW=10KHz,
VBW =30KHz
Sweep time= Auto
Trace = max hold
Detector function = peak
Frequency :30MHz-1GHz
RBW=120KHz,
VBW=300KHz
Sweep time= Auto
Trace = max hold
Detector function = peak, QP
Frequency :Above 1GHz
RBW=1MHz,
VBW=3MHz(Peak), 10Hz(AV)
Sweep time= Auto
Trace = max hold
Detector function = peak, AV
10.3 Corrected Amplitude & Margin Calculation
The Corrected Amplitude is calculated by adding the Antenna Factor and the Cable Factor, and subtracting the
Amplifier Gain from the Amplitude reading. The basic equation is as follows:
Corr. Ampl. = Indicated Reading + Ant. Factor + Cable Loss – Ampl. Gain
The “Margin” column of the following data tables indicates the degree of compliance with the applicable limit.
For example, a margin of -6dBV means the emission is 6dBV below the maximum limit. The equation for
margin calculation is as follows:
Margin = Corr. Ampl. – FCC Part 15 Limit
10.4 Environmental Conditions
Temperature:
25 C
Relative Humidity:
52
ATM Pressure:
1012 mbar
REPORT NO.: STR16128279I-1
PAGE 36 OF 54
FCC PART 15.247
Model: FBL528
10.5 Summary of Test Results/Plots
According to the data below, the FCC Part 15.205, 15.209 and 15.247 standards, and had the worst cases:
Note: this EUT was tested in 3 orthogonal positions and the worst case position data was reported.
Plot of Radiated Emissions Test Data (30MHz to 1GHz)
EUT:
Bluetooth Earphone
Tested Model:
FBL528
Operating Condition:
Transmitting Low Channel (2402MHz)
Comment:
DC 3.7V Battery
Test Specification:
No.
Horizontal
Frequency
Reading
Correct
Result
Limit
Margin
Degree
Height
(MHz)
(dBuV/m)
Factor(dB)
(dBuV/m)
(dBuV/m)
(dB)
( º)
(cm)
51.8430
15.73
5.04
20.77
40.00
-19.23
36
100
peak
258.3264
17.25
9.62
26.87
46.00
-19.13
68
100
peak
381.2487
17.45
11.85
29.30
46.00
-16.70
123
100
peak
425.0280
17.72
12.04
29.76
46.00
-16.24
157
100
peak
647.3856
15.53
17.90
33.43
46.00
-12.57
169
100
peak
721.7259
16.70
17.91
34.61
46.00
-11.39
203
100
peak
REPORT NO.: STR16128279I-1
PAGE 37 OF 54
Remark
FCC PART 15.247
Model: FBL528
Test Specification:
No.
Vertical
Frequency
Reading
Correct
Result
Limit
Margin
Degree
Height
(MHz)
(dBuV/m)
Factor(dB)
(dBuV/m)
(dBuV/m)
(dB)
( º)
(cm)
50.4089
15.69
4.99
20.68
40.00
-19.32
42
100
peak
113.3163
14.88
4.86
19.74
43.50
-23.76
90
100
peak
316.5890
15.52
11.96
27.48
46.00
-18.52
134
100
peak
403.2500
15.35
12.55
27.90
46.00
-18.10
182
100
peak
539.4775
17.06
13.81
30.87
46.00
-15.13
209
100
peak
672.8445
16.84
18.29
35.13
46.00
-10.87
266
100
peak
REPORT NO.: STR16128279I-1
PAGE 38 OF 54
Remark
FCC PART 15.247
Model: FBL528
Operating Condition:
Comment:
Transmitting Middle Channel (2441MHz)
DC 3.7V
Test Specification:
Horizontal
No.
Frequency
Reading
Correct
Result
Limit
Margin
Degree
Height
(MHz)
(dBuV/m)
Factor(dB)
(dBuV/m)
(dBuV/m)
(dB)
( º)
(cm)
55.2207
14.99
5.02
20.01
40.00
-19.99
61
100
peak
108.2667
15.53
4.88
20.41
43.50
-23.09
115
100
peak
163.7550
18.63
2.44
21.07
43.50
-22.43
163
100
peak
379.9141
18.42
11.79
30.21
46.00
-15.79
186
100
peak
420.5803
17.64
11.90
29.54
46.00
-16.46
257
100
peak
687.1507
16.54
18.14
34.68
46.00
-11.32
295
100
peak
REPORT NO.: STR16128279I-1
PAGE 39 OF 54
Remark
FCC PART 15.247
Model: FBL528
Test Specification:
No.
Vertical
Frequency
Reading
Correct
Result
Limit
Margin
Degree
Height
(MHz)
(dBuV/m)
Factor(dB)
(dBuV/m)
(dBuV/m)
(dB)
( º)
(cm)
56.9912
14.78
5.00
19.78
40.00
-20.22
67
100
peak
106.0126
14.93
4.88
19.81
43.50
-23.69
105
100
peak
377.2591
15.12
11.81
26.93
46.00
-19.07
139
100
peak
528.2458
16.50
13.86
30.36
46.00
-15.64
164
100
peak
631.6884
15.85
17.78
33.63
46.00
-12.37
199
100
peak
782.3453
16.92
16.72
33.64
46.00
-12.36
255
100
peak
REPORT NO.: STR16128279I-1
PAGE 40 OF 54
Remark
FCC PART 15.247
Model: FBL528
Operating Condition:
Comment:
Transmitting High Channel (2480MHz)
DC 3.7V
Test Specification:
Horizontal
No.
Frequency
Reading
Correct
Result
Limit
Margin
Degree
Height
(MHz)
(dBuV/m)
dB/m
(dBuV/m)
(dBuV/m)
(dB)
( º)
(cm)
52.0251
15.75
5.04
20.79
40.00
-19.21
33
100
peak
163.7550
18.44
2.44
20.88
43.50
-22.62
89
100
peak
318.8170
15.32
11.95
27.27
46.00
-18.73
143
100
peak
414.7223
16.26
12.10
28.36
46.00
-17.64
169
100
peak
675.2080
15.52
18.42
33.94
46.00
-12.06
225
100
peak
782.3453
16.46
16.72
33.18
46.00
-12.82
274
100
peak
REPORT NO.: STR16128279I-1
PAGE 41 OF 54
Remark
FCC PART 15.247
Model: FBL528
Test Specification:
No.
Vertical
Frequency
Reading
Correct
Result
Limit
Margin
Degree
Height
(MHz)
(dBuV/m)
dB/m
(dBuV/m)
(dBuV/m)
(dB)
( º)
(cm)
56.3948
15.00
5.00
20.00
40.00
-20.00
45
100
peak
65.3432
15.52
3.90
19.42
40.00
-20.58
87
100
peak
293.0842
15.37
11.69
27.06
46.00
-18.94
136
100
peak
406.0880
16.54
12.45
28.99
46.00
-17.01
169
100
peak
477.1694
16.90
12.61
29.51
46.00
-16.49
205
100
peak
658.8362
16.78
17.61
34.39
46.00
-11.61
269
100
peak
REPORT NO.: STR16128279I-1
PAGE 42 OF 54
Remark
FCC PART 15.247
Model: FBL528
Spurious Emissions Above 1GHz
Frequency
Reading
Correct
Result
Limit
Margin
Polar
(MHz)
(dBuV/m)
dB
(dBuV/m)
(dBuV/m)
(dB)
H/V
Detector
Low Channel-2402MHz
4804
54.55
-3.59
50.96
74
-23.04
PK
4804
40.91
-3.59
37.32
54
-16.68
AV
7206
56.36
-0.52
55.84
74
-18.16
PK
7206
42.73
-0.52
42.21
54
-11.79
AV
4804
57.27
-3.59
53.68
74
-20.32
PK
4804
44.55
-3.59
40.96
54
-13.04
AV
7206
59.09
-0.52
58.57
74
-15.43
PK
7206
41.82
-0.52
41.30
54
-12.70
AV
Middle Channel-2441MHz
4882
53.64
-3.49
50.15
74
-23.85
PK
4882
44.55
-3.49
41.06
54
-12.94
AV
7323
56.36
-0.47
55.89
74
-18.11
PK
7323
40.91
-0.47
40.44
54
-13.56
AV
4882
56.36
-3.49
52.87
74
-21.13
PK
4882
47.27
-3.49
43.78
54
-10.22
AV
7323
58.18
-0.47
57.71
74
-16.29
PK
7323
40.00
-0.47
39.53
54
-14.47
AV
High Channel-2480MHz
4960
53.64
-3.41
50.23
74
-23.77
PK
4960
42.73
-3.41
39.32
54
-14.68
AV
7440
52.73
-0.42
52.31
74
-21.69
PK
7440
45.45
-0.42
45.03
54
-8.97
AV
4960
58.18
-3.41
54.77
74
-19.23
PK
4960
45.45
-3.41
42.04
54
-11.96
AV
7440
55.45
-0.42
55.03
74
-18.97
PK
7440
42.73
-0.42
42.31
54
-11.69
AV
Note: Testing is carried out with frequency rang 9kHz to the tenth harmonics, other than listed in the table above
are attenuated more than 20dB below the permissible limits or the field strength is too small to be measured.
REPORT NO.: STR16128279I-1
PAGE 43 OF 54
FCC PART 15.247
Model: FBL528
11. Out of Band Emissions
11.1 Standard Applicable
According to §15.247 (d) In any 100 kHz bandwidth outside the frequency band in which the spread spectrum or
digitally modulated intentional radiator is operating, the radio frequency power that is produced by the intentional
radiator shall be at least 20 dB below that in the 100 kHz bandwidth within the band that contains the highest level
of the desired power, based on either an RF conducted or a radiated measurement, provided the transmitter
demonstrates compliance with the peak conducted power limits. If the transmitter complies with the conducted
power limits based on the use of RMS averaging over a time interval, as permitted under paragraph (b)(3) of this
section, the attenuation required under this paragraph shall be 30 dB instead of 20 dB. Attenuation below the
general limits specified in §15.209(a) is not required. In addition, radiated emissions which fall in the restricted
bands, as defined in §15.205(a), must also comply with the radiated emission limits specified in §15.209(a).
11.2 Test Procedure
According to the DA 00-705, the band-edge radiated test method as follows.
Set span = wide enough to capture the peak level of the emission operating on the channel closest to the bandedge,
as well as any modulation products which fall outside of the authorized band of operation (2310MHz to 2410MHz
for low bandedge, 2470MHz to 2500MHz for the high bandedge)
RBW = 1MHz, VBW = 1MHz for peak value measured
RBW = 1MHz, VBW = 10Hz for average value measured
Sweep = auto; Detector function = peak; Trace = max hold
All the trace to stabilize, set the marker on the emission at the bandedge, or on the highest modulation porduct
outside of the band, if this level is greater than that at the bandedge. Enable the marker-delta function, then use the
marker-to-peak function to move the marker to the peak of the in-band emission. Those emission must comply
with the 15.209 limit for fall in the restricted bands listed in section 15.205. Note that the method of measurement
KDB publication number: 913591 may be used for the radiated bandedge measurements.
According to the DA 00-705, the band-edge conducted test method as follows:
Set span = wide enough to capture the peak level of the emission operating on the channel closest to the bandedge,
as well as any modulation products which fall outside of the authorized band of operation (2380MHz to 2410MHz
for low bandedge, 2470MHz to 2500MHz for the high bandedge)
RBW = 100kHz, VBW = 300kHz
Sweep = auto; Detector function = peak; Trace = max hold
All the trace to stabilize, set the marker on the emission at the bandedge, or on the highest modulation porduct
outside of the band, if this level is greater than that at the bandedge. Enable the marker-delta function, then use the
marker-to-peak function to move the marker to the peak of the in-band emission. Those emission must comply
with the limit specified in this section (at least 20dB attenuation).
REPORT NO.: STR16128279I-1
PAGE 44 OF 54
FCC PART 15.247
Model: FBL528
11.3 Environmental Conditions
Temperature:
23C
Relative Humidity:
54
ATM Pressure:
1011 mbar
11.4 Summary of Test Results/Plots
Restricted Bandedge (Radiated)
Lowest Bandedge
Horizontal (Worst case)
No.
Frequency
Reading
Correct
Result
Limit
Margin
(MHz)
(dBuV/m)
Factor(dB)
(dBuV/m)
(dBuV/m)
(dB)
2310.000
29.77
-3.71
26.06
54.00
-27.94
Average Detector
2310.000
41.71
-3.71
38.00
74.00
-36.00
Peak Detector
2376.000
32.35
-3.57
28.78
54.00
-25.22
Average Detector
2390.000
30.54
-3.54
27.00
54.00
-27.00
Average Detector
2390.000
42.33
-3.54
38.79
74.00
-35.21
Peak Detector
REPORT NO.: STR16128279I-1
PAGE 45 OF 54
Remark
FCC PART 15.247
Model: FBL528
Highest Bandedge
Horizontal (Worst case)
No.
Frequency
Reading
Correct
Result
Limit
Margin
(MHz)
(dBuV/m)
Factor(dB)
(dBuV/m)
(dBuV/m)
(dB)
2480.000
90.81
-3.33
87.48
Average Detector
2480.000
96.23
-3.33
92.90
Peak Detector
39.16
54.00
-14.84
Average Detector
44.58
74.00
-29.42
Peak Detector
2483.500
2483.500
Delta = 48.32dBc
Remark
2500.000
30.00
-3.28
26.72
54.00
-27.28
Average Detector
2500.000
43.26
-3.28
39.98
74.00
-34.02
Peak Detector
REPORT NO.: STR16128279I-1
PAGE 46 OF 54
FCC PART 15.247
Model: FBL528
Out of Bandedge and Spurious Emission (Conducted)
Lowest
REPORT NO.: STR16128279I-1
PAGE 47 OF 54
FCC PART 15.247
Model: FBL528
Middle
REPORT NO.: STR16128279I-1
PAGE 48 OF 54
FCC PART 15.247
Model: FBL528
Highest
REPORT NO.: STR16128279I-1
PAGE 49 OF 54
FCC PART 15.247
Model: FBL528
Out of Bandedge-Hopping (Conducted)
Lowest Bandedge
Highest Bandedge
REPORT NO.: STR16128279I-1
PAGE 50 OF 54
FCC PART 15.247
Model: FBL528
12. Conducted Emissions
12.1 Test Procedure
The setup of EUT is according with per ANSI C63.4-2014 measurement procedure. The specification used was
with the FCC Part 15.207 Limit.
The external I/O cables were draped along the test table and formed a bundle 30 to 40 cm long in the middle.
The spacing between the peripherals was 10 cm.
12.2 Basic Test Setup Block Diagram
EUT
Notebook
LISN
1.0 m
To Receiver
Non-conduction table
1.5
80 cm above Ground
Plane
1. 5 m
12.3 Environmental Conditions
Temperature:
25 C
Relative Humidity:
52
ATM Pressure:
1012 mbar
REPORT NO.: STR16128279I-1
PAGE 51 OF 54
FCC PART 15.247
Model: FBL528
12.4 Test Receiver Setup
During the conducted emission test, the test receiver was set with the following configurations:
Start Frequency .......................................................................... 150 kHz
Stop Frequency........................................................................... 30 MHz
Sweep Speed .............................................................................. Auto
IF Bandwidth.............................................................................. 10 kHz
Quasi-Peak Adapter Bandwidth ................................................. 9 kHz
Quasi-Peak Adapter Mode ......................................................... Normal
12.5 Summary of Test Results/Plots
According to the data in section 12.6, the EUT complied with the FCC Part 15.207 Conducted margin for this
device, with the worst margin reading of:
-11.82 dB at 4.0980 MHz in the Neutral mode, peak detector, 0.15-30MHz
12.6 Conducted Emissions Test Data
REPORT NO.: STR16128279I-1
PAGE 52 OF 54
FCC PART 15.247
Model: FBL528
Plot of Conducted Emissions Test Data
EUT:
Bluetooth Earphone
Tested Model:
FBL528
Operating Condition:
BT Transmitting
Comment:
AC 120V/60Hz; USB 5V
Test Specification:
No.
Neutral
Frequency
Reading
Correct
Result
Limit
Margin
(MHz)
(dBuV)
(dB/m)
(dBuV)
(dBuV)
(dB)
0.1700
23.59
9.50
33.09
54.96
-21.87
AVG
0.1940
38.75
9.50
48.25
63.86
-15.61
peak
1.6140
31.79
9.77
41.56
56.00
-14.44
peak
1.8980
20.12
9.81
29.93
46.00
-16.07
AVG
3.6700
21.92
10.05
31.97
46.00
-14.03
AVG
6*
4.0980
34.07
10.11
44.18
56.00
-11.82
peak
REPORT NO.: STR16128279I-1
PAGE 53 OF 54
Detector
FCC PART 15.247
Model: FBL528
Test Specification:
No.
Line
Frequency
Reading
Correct
Result
Limit
Margin
Detector
(MHz)
(dBuV)
(dB/m)
(dBuV)
(dBuV)
(dB)
0.1980
41.60
9.50
51.10
63.69
-12.59
peak
0.1980
26.19
9.50
35.69
53.69
-18.00
AVG
1.8740
30.75
9.80
40.55
56.00
-15.45
peak
1.9420
17.71
9.81
27.52
46.00
-18.48
AVG
5*
3.5940
33.94
10.04
43.98
56.00
-12.02
peak
3.7900
23.47
10.07
33.54
46.00
-12.46
AVG
***** END OF REPORT *****
REPORT NO.: STR16128279I-1
PAGE 54 OF 54
FCC PART 15.247
Download: FBL528 Bluetooth Earphone Test Report FCC Part 15.247B Dongguan Kingtron Tech. Co., Ltd.
Mirror Download [FCC.gov]FBL528 Bluetooth Earphone Test Report FCC Part 15.247B Dongguan Kingtron Tech. Co., Ltd.
Document ID3249862
Application ID3Ir4mda/8YWehmOBUomWYw==
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Date Submitted2017-01-06 00:00:00
Date Available2017-01-06 00:00:00
Creation Date2017-01-04 16:02:18
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Document TitleFCC Part 15.247B
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Document Author: Administrator

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