Test report

FCC ID: 2AI4T-VVDI

Test Report

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FCCID_3497848

Page 2 of 23 Report No.: T1870724 07

TABLE OF CONTENT
Description Page
1. General Information ...................................................................................................................... 4
1.1. Description of Device (EUT) ......................................................................................... 4
1.2. Description of Test Facility ............................................................................................ 5
1.3. Test Procedure ................................................................................................................ 5
2.Summary of test .............................................................................................................................. 6
2.1. Summary of test result ................................................................................................... 6
2.2. Assistant equipment used for test ................................................................................... 6
2.3. Block Diagram of Test setup .......................................................................................... 6
2.4. Test mode ....................................................................................................................... 7
2.5. Test Conditions .............................................................................................................. 7
2.6. Measurement Uncertainty (95% confidence levels, k=2) .............................................. 7
2.7. Test Equipment............................................................................................................... 8
3.20dB bandwidth .............................................................................................................................. 9
3.1. Limit ............................................................................................................................... 9
3.2. Test Procedure ................................................................................................................ 9
3.3. Test Setup ....................................................................................................................... 9
3.4. Test Result .................................................................................................................... 10
4.Radiated emissions ....................................................................................................................... 11
4.1. Limit(FCC 15.209)....................................................................................................... 11
4.2. Block Diagram of Test setup ........................................................................................ 11
4.3. Test Procedure .............................................................................................................. 12
4.4. Test Result .................................................................................................................... 13
5.Power Line Conducted Emissions ............................................................................................... 17
5.1. Block Diagram of Test Setup ....................................................................................... 17
5.2. Limit ............................................................................................................................. 17
5.3. Test Procedure .............................................................................................................. 17
5.4. Test Result .................................................................................................................... 18
6.Antenna Requirements ................................................................................................................ 20
6.1. Standard Requirement .................................................................................................. 20
6.2. Antenna Connected Construction ................................................................................ 20
6.3. Results .......................................................................................................................... 20
7.Test setup photo ............................................................................................................................ 21
8.Photos of EUT ............................................................................................................................... 23

Page 5 of 23 Report No.: T1870724 07

1.2. Description of Test Facility
Shenzhen Alpha Product Testing Co., Ltd
Building B, East Area of Nanchang Second, Industrial Zone, Gushu 2nd Road,
Bao'an, Shenzhen, China
March 25, 2015 File on Federal Communication Commission
Registration Number: 203110
July 18, 2014 Certificated by IC
Registration Number: 12135A

1.3. Test Procedure
POWER LINE CONDUCTED INTERFERENCE:
The test procedure used was ANSI Standard ANSI C63.4:2014 using a 50ｕH
LISN. Both Lines were observed. The bandwidth of the receiver was 10kHz with
an appropriate sweep speed. The ambient temperature of the EUT was 25℃ with a
humidity of 58%.

RADIATION INTERFERENCE:
The test procedure used was ANSI Standard ANSI C63.4:2014 using a
ANRITSU spectrum analyzer with a pre-selector. The analyzer was calibrated
in dB above a micro volt at the output of the antenna. The resolution bandwidth
was 100kHz and the video bandwidth was 300 kHz up to 1 GHz and 1 MHz
with a video BW of 3MHz above 1 GHz. The ambient temperature of the EUT
was 25℃ with a humidity of 58%.

FORMULA OF CONVERSION FACTORS:
The Field Strength at 3m was established by adding the meter reading of the
spectrum analyzer (which is set to read in units of dBuV) to the antenna
correction factor supplied by the antenna manufacturer and cable loss. The
antenna correction factors and cable loss are stated in terms of dB. The gain of
the Pre-selector was accounted for in the Spectrum Analyzer Meter Reading.
Example:
Freq (MHz) METER READING + ACF + CABLE = FS
33.20 dBuV + 10.36 dB + 0.9 dB= 44.46 dBuV/m @ 3m
ANSI STANDARD ANSI C63.4:2014 10.1.7 MEASUREMENT
PROCEDURES: The EUT was placed on a table 80 cm high and with
dimensions of 1m by 1.5m. The EUT was placed in the center of the table (1.5m
side). The table used for radiated measurements is capable of continuous
rotation. When an emission was found, the table was rotated to produce the
maximum signal strength. At this point, the antenna was raised and lowered
from 1m to 4m. The antenna was placed in both the horizontal and vertical
planes. The situation was similar for the conducted measurement except that the
table did not rotate. The EUT was setup as described in ANSI Standard ANSI
C63.4:2014 10.1.7 with the EUT 40 cm from the vertical ground wall.

Page 7 of 23 Report No.: T1870724 07

2.4. Test mode
Tested mode, channel, and data rate information
Frequency
Mode Channel
(KHz)
1 CH1 125
Note: According exploratory test, EUT will have maximum output power
in those data rate. so those data rate were used for all test.
NOTE: NEW BATTERY IS USED DURING ALL TEST

2.5. Test Conditions
Temperature range 21-25℃
Humidity range 40-75%
Pressure range 86-106kPa

2.6. Measurement Uncertainty (95% confidence levels, k=2)

Item MU Remark
Uncertainty for Power point Conducted Emissions
2.71dB
Test
Uncertainty for Radiation Emission test in 3m 2.13 dB Polarize: V
chamber
(below 30MHz) 2.57dB Polarize: H
Uncertainty for Radiation Emission test in 3m 3.90dB Polarize: V
chamber
3.92dB Polarize: H
(30MHz to 1GHz)
Uncertainty for Radiation Emission test in 3m 4.28dB Polarize: H
chamber
4.26dB Polarize: V
(1GHz to 25GHz)
Uncertainty for radio frequency 1×10-9
Uncertainty for conducted RF Power 0.16dB
Uncertainty for temperature 0.2℃
Uncertainty for humidity 1%
Uncertainty for DC and low frequency voltages 0.06%

Page 9 of 23 Report No.: T1870724 07

3. 20dB bandwidth
3.1. Limit
Intentional radiators operating under the alternative provisions to the general emission
limits, as contained in §§15.217 through 15.257 and in Subpart E of this part, must be
designed to ensure that the 20 dB bandwidth of the emission, or whatever bandwidth
may otherwise be specified in the specific rule section under which the equipment
operates, is contained within the frequency band designated in the rule section under
which the equipment is operated.

3.2. Test Procedure
The transmitter output was coupled to a spectrum analyzer via a antenna. The
bandwidth of the fundamental frequency was measured by spectrum analyzer with
3KHz RBW and 10kHz VBW. The 20dB bandwidth is defined as the total spectrum
the power of which is higher than peak power minus 20dB.

3.3. Test Setup

Spectrum Analyzer
EUT

Page 13 of 23 Report No.: T1870724 07

test program was started. Emissions were scanned and measured rotating the EUT to
360 degrees and positioning the antenna 1 to 4 meters above the ground plane, in both
the vertical and the horizontal polarization, to maximize the emission reading level.

The test mode(s) described in clause 2.4 were scanned during the preliminary test:

After the preliminary scan, we found the test mode producing the highest emission
level. The EUT and cable configuration, antenna position, polarization and turntable
position of the above highest emission level were recorded for the final test.

Procedure of Final Test
EUT and support equipment were set up on the turntable as per the configuration with
highest emission level in the preliminary test.

The Receiver scanned from9KHz to 30MHz and 30MHz to 1GHz. Emissions were
scanned and measured rotating the EUT to 360 degrees, varying cable placement and
positioning the antenna 1 to 4 meters above the ground plane, in both the vertical and
the horizontal polarization, to maximize the emission reading level.

Recorded at least the six highest emissions. Emission frequency, amplitude, antenna
position, polarization and turntable position were recorded into a computer in which
correction factors were used to calculate the emission level and compare reading to
the applicable limit and only Q.P. reading is presented.

The test data of the worst-case condition(s) was recorded.

The bandwidth of test receiver is set at 200Hz for 9 KHz to 150 KHz measure, 10
KHz for 150 KHz to 30MHz measure and 120 KHz for 30 MHz to 1GHz measure .

4.4. Test Result

PASS. (See below detailed test result)

Page 14 of 23 Report No.: T1870724 07

Radiated Emissions Result (125KHz)
EUT VVDI Key Tool Model Name VVDI Key Tool

Temperature 26oC Relative Humidity 56%

Pressure 960hPa Test voltage DC 5V

Test Mode TX Distance 3m

Detector
Freq. Position Reading Factor Actual FS Limits 3m Margin
Mode
(MHz) H/V (dBuV) (dB) (dBuV/m) (dBuV/m) (dBuV/m)
(PK/QP)
0.110 H Peak 25.73 24.8 50.53 126.77 76.24
0.125 H Peak 46.47 24.8 71.27 125.67 54.4
0.484 H Peak 23.91 25.03 48.94 113.71 64.77
0.500 H Peak 27.04 25.03 52.07 113.62 61.55
N/A
Detector
Freq. Position Reading Factor Actual FS Limits 3m Margin
Mode
(MHz) H/V (dBuV) (dB) (dBuV/m) (dBuV/m) (dBuV/m)
(PK/QP)
0.110 V Peak 24.51 24.8 49.31 126.77 77.46
0.125 V Peak 43.91 24.8 68.71 125.67 56.96
0.495 V Peak 22.53 25.03 47.56 113.71 66.15
0.500 V Peak 25.49 25.03 50.52 113.62 63.1
N/A
Note:
1: 30m to 3m correction factor calculation:
40*Log(30m/3m)=40
2: --Means other frequency and mode comply with standard requirements and at least have 20dB margin.
3: Correct Factor=Cable Loss+ Antenna Factor- Amplifier Gain
Measurement Result=Reading + Correct Factor
Margin=Measurement Result-Limit

Page 20 of 23 Report No.: T1870724 07

6. Antenna Requirements

6.1. Standard Requirement

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. The manufacturer may design the unit so that a broken antenna can
be replaced by the user, but the use of a standard antenna jack or electrical
connector is prohibited.

6.2. Antenna Connected Construction

The antenna is Coil antenna and no consideration of replacement. Please see
EUT photo for details.

6.3. Results

The EUT antenna is Coil Antenna. It comply with the standard requirement.

Document Created: 2017-08-02 15:58:47
Document Modified: 2017-08-02 15:58:47

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