Test Report

FCC ID: BWY-MHA50

Test Report

Download: PDF

FCCID_3571842

McIntosh Laboratory Inc.
Intertek Report: No:
17062161HKG‐002R1

TEST REPORT

TABLE OF CONTENTS

1.0 GENERAL DESCRIPTION ....................................................................................................... 5
1.1 Product Description ......................................................................................................... 5
1.2 Related Submittal(s) Grants ............................................................................................. 5
1.3 Test Methodology............................................................................................................ 5
1.4 Test Facility ...................................................................................................................... 5

2.0 SYSTEM TEST CONFIGURATION .......................................................................................... 6
2.1 Justification...................................................................................................................... 6
2.2 EUT Exercising Software................................................................................................... 6
2.3 Special Accessories........................................................................................................... 6
2.4 Measurement Uncertainty............................................................................................... 6
2.5 Support Equipment List and Description .......................................................................... 6

3.0 EMISSION RESULTS.............................................................................................................. 7
3.1 Field Strength Calculation ................................................................................................ 7
3.2 Radiated Emission Configuration Photograph.................................................................. 8
3.3 Radiated Emission Data.................................................................................................... 8
3.4 Conducted Emission Configuration Photograph............................................................... 8
3.5 Conducted Emission Data ................................................................................................ 8

4.0 EQUIPMENT PHOTOGRAPHS ............................................................................................ 14

5.0 PRODUCT LABELLING ........................................................................................................ 14

6.0 TECHNICAL SPECIFICATIONS.............................................................................................. 14

7.0 INSTRUCTION MANUAL .................................................................................................... 14

8.0 MISCELLANEOUS INFORMATION ...................................................................................... 15
8.1 Measured Bandwidth / Radiated Emission on the Bandedge......................................... 15
8.2 Discussion of Pulse Desensitization ................................................................................ 18
8.3 Calculation of Average Factor ........................................................................................ 18
8.4 Emissions Test Procedures ............................................................................................. 19
8.5 Occupied Bandwidth...................................................................................................... 23

9.0 CONFIDENTIALITY REQUEST ............................................................................................. 24

10.0 EQUIPMENT LIST ............................................................................................................... 24

Page 4 of 25

McIntosh Laboratory Inc.
Intertek Report: No:
17062161HKG‐002R1

TEST REPORT

1.0 GENERAL DESCRIPTION

1.1 Product Description

The Equipment Under Test (EUT) is a Portable Decoding Amplifier, equipped with a Bluetooth
module. After pairing the EUT to the Bluetooth devices (e.g. Apple iphone or Android
smartphone), user can play audio signal via Bluetooth wireless link. The Bluetooth module in the
EUT is operating in the frequency range from 2402MHz to 2480MHz (79 channels with 1MHz
channel spacing). The audio signal is amplified and fed to the external headphone. The EUT can
accept USB Digital Audio Signal playback coming from devices using iOS Mobile (Apple) or Android
Operating System. It also allows USB connection to a Computer using Windows or MAC Apple’s OS
(PC connectivity). The EUT is powered by 3.7V internal rechargeable battery and/or USB port
(5VDC). The 3.7V internal battery is charged via USB port. The applicant declared that Bluetooth
4.0 BLE feature is not supported by the EUT.

Antenna Type: Internal, Integral

For electronic filing, the brief circuit description is saved with filename: descri.pdf.

1.2 Related Submittal(s) Grants

This is a single application for certification of a transceiver.

The Declaration of the Conformity procedure for this transceiver (with FCC ID: BWY‐MHA50) is
being processed as the same time of this application.

1.3 Test Methodology

Both AC mains line‐conducted and radiated emission measurements were performed
according to the procedures in ANSI C63.10 (2013). All radiated measurements were
performed in an 3m Chamber. Preliminary scans were performed in the 3m Chamber only
to determine worst case modes. All radiated tests were performed at an antenna to EUT
distance of 3 meters, unless stated otherwise in the “Justification Section” of this Application.

1.4 Test Facility

The 3m Chamber and conducted measurement facility used to collect the radiated data is
located at Workshop No. 3, G/F., World‐Wide Industrial Centre, 43‐47 Shan Mei Street, Fo Tan,
Sha Tin, N.T., Hong Kong. This test facility and site measurement data have been placed on file
with the FCC and IC No. 2042V‐1.

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McIntosh Laboratory Inc.
Intertek Report: No:
17062161HKG‐002R1

TEST REPORT

2.0 SYSTEM TEST CONFIGURATION
2.1 Justification

The system was configured for testing in a typical fashion (as a customer would normally use it),
and in the confines as outlined in ANSI C63.10 (2013).

The device was powered by USB port (5VDC) and/or 3.7V rechargeable battery. (All powering
method had been considered, including standalone 3.7V rechargeable battery without charging,
powered by USB Port of PC and powered by adaptor with USB 5VDC output. And worse case
powering method were sued for testing (Powered by USB Port of PC).

For maximizing emissions, the EUT was rotated through 360°, the antenna height was varied from
1 meter to 4 meters above the ground plane, and the antenna polarization was changed. This
step by step procedure for maximizing emissions led to the data reported in Exhibit 3.0.

The rear of unit shall be flushed with the rear of the table.

The equipment under test (EUT) was configured for testing in a typical fashion (as a customer
would normally use it). The EUT was mounted to a plastic stand if necessary and placed on the
wooden turntable, which enabled the engineer to maximize emissions through its placement in
the three orthogonal axes.

All configuration mode (with and without USB connectivity to smartphone and PC during
transceiver test) had been considered, and worst case test data (with USB connectivity between
smartphone and PC) is shown on this test report.

2.2 EUT Exercising Software

The EUT exercise program (if any) used during radiated testing was designed to exercise the
various system components in a manner similar to a typical use.

2.3 Special Accessories

There are no special accessories necessary for compliance of this product.

2.4 Measurement Uncertainty

When determining of the test conclusion, the Measurement Uncertainty of test has been
considered.

Uncertainty and Compliance ‐ Unless the standard specifically states that measured values are to
be extended by the measurement uncertainty in determining compliance, all compliance
determinations are based on the actual measured value.

2.5 Support Equipment List and Description

1. iphone
2. HP Notebook Computer (Adaptor, Model: HSTNN‐CA15)
3. 1 x LAN Cable of 2m Long
4. 2 x USB Cable of 1m Long
(Provided by Intertek)
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McIntosh Laboratory Inc.
Intertek Report: No:
17062161HKG‐002R1

TEST REPORT

3.0 EMISSION RESULTS

Data is included of the worst case configuration (the configuration which resulted in the highest
emission levels). A sample calculation, configuration photographs and data tables of the
emissions are included.

3.1 Field Strength Calculation

The field strength is calculated by adding the Antenna Factor and Cable Factor, and subtracting
the Amplifier Gain (if any), Average Factor (optional) from the measured reading. The basic
equation with a sample calculation is as follows:
FS = RA + AF + CF ‐ AG ‐ AV
where FS = Field Strength in dBµV/m
RA = Receiver Amplitude (including preamplifier) in dBµV
CF = Cable Attenuation Factor in dB
AF = Antenna Factor in dB
AG = Amplifier Gain in dB
AV = Average Factor in dB

In the following table(s), the reading shown on the data table reflects the preamplifier gain. An
example for the calculations in the following table is as follows:
FS = RR + LF
where FS = Field Strength in dBµV/m
RR = RA ‐ AG ‐ AV in dBµV
LF = CF + AF in dB

Assume a receiver reading of 52.0 dBµV is obtained. The antenna factor of 7.4 dB and cable
factor of 1.6 dB are added. The amplifier gain of 29 dB and average factor of 5 dB are
subtracted, giving a field strength of 32 dBµV/m. This value in dBµV/m was converted to its
corresponding level in µV/m.

RA = 52.0 dBµV/m
AF = 7.4 dB RR = 18.0 dBµV
CF = 1.6 dB LF = 9.0 dB
AG = 29.0 dB
AV = 5.0 dB
FS = RR + LF
FS = 18 + 9 = 27 dBµV/m

Level in µV/m = Common Antilogarithm [(27 dBµV/m)/20] = 22.4 µV/m

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McIntosh Laboratory Inc.
Intertek Report: No:
17062161HKG‐002R1

TEST REPORT

3.2 Radiated Emission Configuration Photograph

The worst case in radiated emission was found at 262.558 MHz

For electronic filing, the worst case radiated emission configuration photographs are saved with
filename: radiated photos.pdf.

3.3 Radiated Emission Data

The data on the following page lists the significant emission frequencies, the limit and the margin
of compliance. Numbers with a minus sign are below the limit.

Judgment: Passed by 1.2 dB

3.4 Conducted Emission Configuration Photograph

The worst case in line‐conducted emission was found at 0.150 MHz

For electronic filing, the worst case line‐conducted configuration photographs are saved with
filename: conducted photo.pdf.

3.5 Conducted Emission Data

For electronic filing, the graph and data table of conducted emission is saved with filename:
conducted.pdf.

Judgment: Pass by 9.0 dB

Page 8 of 25

McIntosh Laboratory Inc.
Intertek Report: No:
17062161HKG‐002R1

TEST REPORT

CONDUCTED EMISSION
Model: MHA50
Date of Test: August 10, 2017
Worst‐Case Operating Mode: Powered by USB Port of PC + Bluetooth Audio Playing

RBW 9 kHz
MT 1 s
Att 10 dB AUTO PREAMP OFF
dBµV 100 1 MHz 10 MHz

90
SGL
1 PK
CLRWR
80

2 AV
CLRWR TDS
70

CF15MQP
60

CF15MAV
50

6DB
40 AC

30

20

10

0

150 kHz 30 MHz

EDIT PEAK LIST (Final Measurement Results)
Trace1: CF15MQP
Trace2: CF15MAV
Trace3: ---
TRACE FREQUENCY LEVEL dBµV DELTA LIMIT dB
1 Quasi Peak 150 kHz 57.01 L1 -8.99
2 CISPR Average190.5 kHz 39.15 L1 -14.85
1 Quasi Peak 235.5 kHz 43.00 N -19.25
2 CISPR Average235.5 kHz 34.08 N -18.16
1 Quasi Peak 339 kHz 39.27 L1 -19.95
2 CISPR Average555 kHz 27.42 N -18.57
1 Quasi Peak 559.5 kHz 40.21 N -15.78
1 Quasi Peak 568.5 kHz 39.25 N -16.74
2 CISPR Average568.5 kHz 29.67 L1 -16.32
1 Quasi Peak 1.032 MHz 31.13 N -24.86
1 Quasi Peak 1.1175 MHz 32.50 L1 -23.49
1 Quasi Peak 1.8285 MHz 30.00 L1 -25.99
1 Quasi Peak 2.6025 MHz 30.24 L1 -25.75
1 Quasi Peak 3.0885 MHz 30.35 N -25.64
1 Quasi Peak 10.698 MHz 35.53 L1 -24.46
1 Quasi Peak 11.202 MHz 34.32 L1 -25.67

Note: Measurement Uncertainty is ±4.2dB at a level of confidence of 95%.

Page 9 of 25

McIntosh Laboratory Inc.
Intertek Report: No:
17062161HKG‐002R1

TEST REPORT

4.0 EQUIPMENT PHOTOGRAPHS

For electronic filing, the photographs are saved with filename: external photos.pdf and internal
photos.pdf.

5.0 PRODUCT LABELLING

For electronics filing, the FCC ID label artwork and the label location are saved with filename:
label.pdf.

6.0 TECHNICAL SPECIFICATIONS

For electronic filing, the block diagram and schematic of the tested EUT are saved with filename:
block.pdf and circuit.pdf respectively.

7.0 INSTRUCTION MANUAL

For electronic filing, a preliminary copy of the Instruction Manual is saved with filename:
manual.pdf.

This manual will be provided to the end‐user with each unit sold/leased in the United States and
Canada.

Page 14 of 25

McIntosh Laboratory Inc.
Intertek Report: No:
17062161HKG‐002R1

TEST REPORT

8.0 MISCELLANEOUS INFORMATION

The miscellaneous information includes details of the test procedure and measured bandwidth /
calculation of factor such as pulse desensitization and averaging factor (calculation and timing
diagram).

8.1 Radiated Emission on the Bandedge (for Section 15.249)

From the following plots, they show that the fundamental emissions are confined in the specified
band (2400MHz to 2483.5MHz). In case of the fundamental emissions are within two standard
bandwidths from the bandedge, the delta measurement technique is used for determining
bandedge compliance. Standard bandwidth is the bandwidth specified by ANSI C63.10 (2013)
for frequency being measured.

Emissions radiated outside of the specified frequency bands, except harmonics, are attenuated by
50dB below the level of the fundamental or to the general radiated emissions limits in
Section 15.209 , whichever is the lesser attenuation, which meet the requirement of
part 15.249(d).

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McIntosh Laboratory Inc.
Intertek Report: No:
17062161HKG‐002R1

TEST REPORT

Peak Measurement

Bandedge compliance is determined by applying marker‐delta method, i.e. (Bandedge Plot).

Lower bandedge

Peak Resultant field strength = Fundamental emissions (peak value) – delta from the plot

=98.2 dBµV/m ‐ 43.5 dB
=54.7 dBµV/m

Average Resultant field strength = Fundamental emissions (average value) – delta from the plot

=74.2 dBµV/m ‐ 43.5 dB
=30.7 dBµV/m

Upper bandedge

Peak Resultant field strength = Fundamental emissions (peak value) – delta from the plot

=99.2 dBµV/m ‐ 61.2 dB
=38.0 dBµV/m

Average Resultant field strength = Fundamental emissions (average value) – delta from the plot

=75.2 dBµV/m – 61.2 dB
=14.0 dBµV/m

The resultant field strength meets the general radiated emission limit in Section 15.209, which
does not exceed 74 dBµV/m (Peak Limit) and 54 dBµV/m (Average Limit).

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McIntosh Laboratory Inc.
Intertek Report: No:
17062161HKG‐002R1

TEST REPORT

8.2 Discussion of Pulse Desensitization

Pulse desensitivity is not applicable for this device. The effective period (Teff) is approximately
625µs for a digital “1” bit which illustrated on technical specification, with a resolution bandwidth
(3dB) of 3MHz, so the pulse desensitivity factor is 0dB.

8.3 Calculation of Average Factor

Based on the Bluetooth Specification Version 3.0 + EDR, the transmitter ON time for each timeslot
of Bluetooth is 625µs. DH5 has the maximum duty cycle, which consists of 5 continuous Tx
slots and 1 Rx slot. Therefore one hopset take (5+1) x 625µs = 3.75ms. For one period for a
pseudo‐random hopping through at least 20 RF channels in adaptive mode (worse case), it take:
20 x 3.75ms = 75ms.

The dwell time for DH5 is 5 x 625µs = 3.125ms.

For the worst case calculation, there are two transmissions might occur in 100ms. Therefore,

Duty Cycle (DC) = Maximum On time in 100ms/100ms
= 3.125ms x 2/100ms
= 0.0625

Average Factor (AF) of Bluetooth in dB = 20 log10 (0.0625)
= ‐24 dB

Page 18 of 25

McIntosh Laboratory Inc.
Intertek Report: No:
17062161HKG‐002R1

TEST REPORT

8.4 Emissions Test Procedures (cont’d)

The EUT is warmed up for 15 minutes prior to the test.

AC power to the unit is varied from 85% to 115% nominal and variation in the fundamental
emission field strength is recorded. If battery powered, a new, fully charged battery is used.

Conducted measurements were made as described in ANSI C63.10 (2013).

The IF bandwidth used for measurement of radiated signal strength was 100 kHz or greater when
frequency is below 1000 MHz. Where pulsed transmissions of short enough pulse duration
warrant, a greater bandwidth is selected according to the recommendations of Hewlett Packard
Application Note 150‐2. A discussion of whether pulse desensitivity is applicable to this unit is
included in this report (See Exhibit 8.1). Above 1000 MHz, a resolution bandwidth of 3 MHz is
used.

Transmitter measurements are normally conducted at a measurement distance of three
meters. However, to assure low enough noise floor in the forbidden bands and above 1 GHz,
signals are acquired at a distance of one meter or less. All measurements are extrapolated to three
meters using inverse scaling, unless otherwise reported. Measurements taken at a closer
distance are so marked.

Page 20 of 25

McIntosh Laboratory Inc.
Intertek Report: No:
17062161HKG‐002R1

TEST REPORT

8.4.1 Radiated Emission Test Setup

The figure below shows the test setup, which is utilized to make these measurements.

Antenna
1.0~4.0m Tower

3m Receiver
Antenna
E
U
T

0.8m

Ground Plane
3m Chamber □

RF Test
Receiver

Test setup of radiated emissions up to 1GHz

Antenna
1.0~4.0m Tower

3m Receiver
E
Antenna
U
T

1.5m

Ground Plane
□

RF Test Spectrum
Analyzer

Test setup of radiated emissions above 1GHz

Page 21 of 25

McIntosh Laboratory Inc.
Intertek Report: No:
17062161HKG‐002R1

TEST REPORT

8.4.2 Conducted Emission Test Procedures

For tabletop equipment, the EUT along with its peripherals were placed on a 1.0m(W)1.5m(L)
and 0.8m in height wooden table. For floor‐standing equipment, the EUT and all cables were
insulated, if required, from the ground plane by up to 12 mm of insulating material. The EUT was
adjusted to maintain a 0.4 meter space from a vertical reference plane. The EUT was connected
to power mains through a line impedance stabilization network (LISN), which provided 50 ohm
coupling impedance for measuring instrument and the chassis ground was bounded to the
horizontal ground plane of shielded room. The excess power cable between the EUT and the
LISN was bundled.

All connecting cables of EUT and peripherals were moved to find the maximum emission.

8.4.3 Conducted Emission Test Setup

AC Power
LISN 1 EUT Peripherals LISN 2

EMI
Receiver AC Power

Page 22 of 25

McIntosh Laboratory Inc.
Intertek Report: No:
17062161HKG‐002R1

TEST REPORT

9.0 CONFIDENTIALITY REQUEST

For electronic filing, a preliminary copy of the confidentiality request is saved with filename:
request.pdf.

10.0 EQUIPMENT LIST

1) Radiated Emissions Test
EQUIPMENT EMI Test Receiver BICONICAL ANTENNA LOG PERIODIC ANTENNA
(9kHz to 26.5GHz)
Registration No. EW‐3156 EW‐0954 EW‐0446
Manufacturer ROHDESCHWARZ EMCO EMCO
Model No. ESR26 3104C 3146
Calibration Date Dec. 06. 2016 Jul. 07, 2016 Jul. 15, 2016
Calibration Due Date Dec. 06, 2017 Jan. 07, 2018 Jan. 15, 2018

EQUIPMENT SPECTRUM ANALYZER Pyramidal Horn DOUBLE RIDGED GUIDE
Antenna ANTENNA
Registration No. EW‐2249 EW‐0905 EW‐1015
Manufacturer R&S EMCO EMCO
Model No. FSP30 3160‐09 3115
Calibration Date Dec. 23, 2016 Feb. 12, 2016 Apr. 26, 2016
Calibration Due Date Nov, 27. 2017 Aug. 12, 2017 Oct. 26, 2017

Equipment Active Loop H‐field RF Cable 9kHz to RF Cable (up to 40GHz)
(9kHz to 30MHz) 1000MHz
Registration No. EW‐2313 EW‐3170 EW‐3155
Manufacturer ELECTROMETRI N/A N/A
Model No. EM‐6876 9kHz to 1000MHz 1‐40 GHz
Calibration Date May. 18, 2016 Mar. 20, 2017 Dec. 05, 2016
Calibration Due Date Nov. 18, 2017 Mar. 20, 2018 Dec. 05, 2017

Equipment Solid State Low Noise Notch Filter (cutoff RF Pre‐amplifier
Preamplifier Assembly frequency 2.4GHz to (9kHz to 40GHz)
(1 ‐ 18)GHz 2.5GHz)
Registration No. EW‐3229 EW‐3155 EW‐3006
Manufacturer BONN ELEKTRO MICROTRONICS SCHWARZBECK
Model No. BLMA 0118‐5G BRM50701‐02 BBV 9744
Calibration Date Oct. 24, 2016 May. 26, 2017 Mar. 23, 2017
Calibration Due Date Oct. 24, 2017 May. 26, 2018 Mar. 23, 2018

Page 24 of 25

McIntosh Laboratory Inc.
Intertek Report: No:
17062161HKG‐002R1

TEST REPORT

2) Conducted Emissions Test
EQUIPMENT EMI TEST RECEIVER LISN RF Cable
9kHz to 1000MHz
Registration No. EW‐2251 EW‐2874 EW‐3170
Manufacturer R&S R&S N/A
Model No. ESCI ENV‐216 9kHz to 1000MHz
Calibration Date Mar. 03, 2017 Mar. 16, 2017 Mar. 20, 2017
Calibration Due Date Mar. 03, 2018 Mar. 16, 2018 Mar. 20, 2018

3) Bandedge/Bandwidth Measurement
EQUIPMENT SPECTRUM ANALYZER RF Cable (up to 40GHz)
1.5m length
Registration No. EW‐2329 EW‐3104
Manufacturer R&S N/A
Model No. FSP3 SMA‐M to SMA‐M
Calibration Date Aug. 26, 2016 Feb. 28, 2017
Calibration Due Date Aug. 26, 2017 Feb. 28, 2018

END OF TEST REPORT

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Document Created: 2017-09-21 09:21:32
Document Modified: 2017-09-21 09:21:32

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