1. General Information
1.1. Client Information
| Applicant | HOLYBRO(H.K.) LIMITED |
| Address | RM 1902 EASEY COMM BLDG253-261 HENNESSY RD WANCHAI HONG KONG |
| Manufacturer | Shenzhen HolyBro Hobby Technical Co.,LTD |
| Address | Floor 4, Jiang Hai Industry District, No.7 Yonghe Road, Shi Yan Town, Bao'an District, Shenzhen City, Guangdong Province, China |
1.2. Description of Device (EUT)
| Product Name | TELEMETRY RADIO 915MHZ |
| Model No. | HT03-V3, HT03 |
| Trade Mark | Holybro |
| Test Power Supply | AC 120V, 60Hz for adapter / AC 240V, 60Hz for adapter |
| Operation Frequency | 916.438381-927.438381MHz |
| Number of Channel | 12 Channels |
| Modulation Type | LoRa/FSK |
| Antenna Type | Cylindrical antenna |
| Antenna Gain(Peak) | 1.5 dBi |
Note: All samples are the same except for appearance, so we are only ready to test "HT03-V3".
Remark: For a more detailed features description, please refer to the manufacturer's specifications or the User's Manual.
1.3. Auxiliary Equipment Used During Test
| Manufacturer | ZTE |
| Model No. | STC-A205011000USBA-C |
| S/N | 201202102100876 |
| Input | 100-240V~50/60Hz 0.3A |
| Output | DC 5V, 1000mA |
1.4. Description of Test Modes
To investigate the maximum EMI emission characteristics generates from EUT, the test system was pre-scanning tested base on the consideration of following EUT operation mode or test configuration mode which possible have effect on EMI emission level. Each of these EUT operation mode(s) or test configuration mode(s) mentioned above was evaluated respectively.
For Conducted Emission
| Final Test Mode | Description |
|---|---|
| Mode 4 | Keeping TX+ Charging Mode |
For Radiated Emission
| Final Test Mode | Description |
|---|---|
| Mode 1 | CH01 |
| Mode 2 | CH06 |
| Mode 3 | CH12 |
| Mode 4 | Keeping TX+ Charging Mode |
1.5. List of Channels
| Channel | Freq. (MHz) | Channel | Freq. (MHz) | Channel | Freq. (MHz) | Channel | Freq. (MHz) |
|---|---|---|---|---|---|---|---|
| 01 | 916.438381 | 07 | 922.438381 | 10 | 925.438381 | ||
| 02 | 917.438381 | 08 | 923.438381 | 11 | 926.438381 | ||
| 03 | 918.438381 | 09 | 924.438381 | 12 | 927.438381 | ||
| 04 | 919.438381 | ||||||
| 05 | 920.438381 | ||||||
| 06 | 921.438381 |
1.6. Description of Test Setup
Setup for Below 30MHz (Conducted Emission): A diagram shows the EUT placed on a table, 0.8m above a metal full soldered ground plane. The EUT is connected via USB to an adapter, which is connected to an AC Line. A LISN (Line Impedance Stabilization Network) is used. A system simulator is also present.
Setup for 30MHz to 1GHz (Radiated Emission): A diagram shows the EUT placed on a table, 0.8m above a metal full soldered ground plane. The EUT is connected via USB to an adapter, which is connected to an AC Line. A system simulator is also connected. An RX Antenna is positioned 1m away from the EUT, connected to a Spectrum Analyzer / Receiver.
Setup for Above 1GHz (Radiated Emission): A diagram shows the EUT placed on a turntable, 1.5m above a metal full soldered ground plane. The EUT is connected via USB to an adapter, which is connected to an AC Line. A system simulator is also connected. An RX Antenna is positioned 1-4m away from the EUT, with an antenna feed point. The antenna is connected to a Spectrum Analyzer / Receiver.
1.7. Test Equipment List
| Item | Equipment | Manufacturer | Model No. | Serial No. | Last Cal. | Cal. Interval | |
|---|---|---|---|---|---|---|---|
| 1. | L.I.S.N. | Artificial Mains Network | Rohde & Schwarz | ENV216 | 100055 | Nov. 17, 2017 | 1 Year |
| 2. | EMI Test Receiver | Rohde & Schwarz | ESCI | 100627 | Nov.17, 2017 | 1 Year | |
| 3. | RF Switching Unit | Compliance Direction | RSU-M2 | 38303 | Nov.17, 2017 | 1 Year | |
| 4. | Spectrum Analysis | Agilent | E4407B | US39390582 | Nov.17, 2017 | 1 Year | |
| 5. | Spectrum Analysis | Agilent | N9038A | MY53227295 | Nov.17, 2017 | 1 Year | |
| 6. | Preamplifier | SKET Electronic | BK1G18G3 OD | KD17503 | Nov. 17, 2017 | 1 Year | |
| 7. | EMI Test Receiver | Rohde & Schwarz | ESPI | 101604 | Nov.17, 2017 | 1 Year | |
| 8. | Double Ridged Horn Antenna | Instruments corporation | GTH-0118 | 351600 | Nov.20, 2017 | 1 Year | |
| 9. | Bilog Broadband Antenna | Schwarzbeck | VULB9163 | VULB 9163-289 | Nov. 20, 2017 | 1 Year | |
| 10. | Loop Antenna | Schwarzbeck | HFH2-Z2 | 100047 | Nov.17, 2017 | 1 Year | |
| 11. | Pre-amplifier | SONOMA | BBHA9170 | 9170-375 | Nov.17, 2017 | 1 Year | |
| 12. | EMI Test Software EZ-EMC | SHURPLE | N/A | 186860 | Nov.17, 2017 | 1 Year | |
| 13. | RF Test Control System | YIHENG | YH3000 | 2017430 | Nov.18, 2017 | 1 Year | |
| 14. | Power Sensor | DAER | RPR3006W | 15100041SN045 | Nov.17, 2017 | 1 Year | |
| 15. | Power Sensor | DAER | RPR3006W | 15100041SN046 | Nov.17, 2017 | 1 Year | |
| 16. | MXA Spectrum Analysis | Agilent | N9020A | MY51170037 | Nov.18, 2017 | 1 Year | |
| 17. | MXG RF Vector Signal Generator | Agilent | N5182A | MY48180656 | Nov.18. 2017 | 1 Year | |
| 18. | Signal Generator | Agilent | E4421B | MY41000743 | Nov.18, 2017 | 1 Year | |
| 19. | DC Power Supply | LW | TPR-6410D | 349315 | Nov.01, 2017 | 1 Year | |
| 20. | Constant Temperature Humidity Chamber | Sertep | ZJ-HWHS8 OB | ZJ-17042804 | Nov.01, 2017 | 1 Year |
1.8. Measurement Uncertainty
| Radiation Uncertainty | Ur = 3.9 dB (Horizontal) | |
| Ur = 3.8 dB (Vertical) | ||
| Conduction Uncertainty | Uc = 3.4 dB |
1.9. Description of Test Facility
The test facility is recognized, certified, or accredited by the following organizations:
FCC-Registration No.: 184111
Shenzhen Anbotek Compliance Laboratory Limited, 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. Registration No. 184111, July 31, 2017.
ISED-Registration No.: 8058A-1
Shenzhen Anbotek Compliance Laboratory Limited, EMC Laboratory has been registered and fully described in a report filed with the (ISED) Innovation, Science and Economic Development Canada. The acceptance letter from the ISED is maintained in our files. Registration 8058A-1, June 13, 2016.
Test Location
All Emissions tests were performed at 1/F, Building D, Sogood Science and Technology Park, Sanwei community, Hangcheng Street, Bao'an District, Shenzhen, Guangdong, China.518102
2. Summary of Test Results
| Standard Section | Test Item | Result |
|---|---|---|
| 15.203 | Antenna Requirement | PASS |
| 15.207 | Conducted Emission | PASS |
| 15.249 | Spurious Emission | PASS |
| 15.215(c) | 20dB Bandwidth | PASS |
| 15.249(c) | Band Edge | PASS |
Remark: "N/A" is an abbreviation for Not Applicable.
3. Conducted Emission Test
3.1. Test Standard and Limit
| Test Standard | Frequency (MHz) | Maximum RF Line Voltage (dBuV) | |||
|---|---|---|---|---|---|
| Quasi-peak Level | Average Level | ||||
| FCC Part15 Section 15.207 | 150kHz~500kHz | 66~56* | 56~46* | ||
| 500kHz~5MHz | 60 | 50 | |||
| 5MHz~30MHz | 56 | 46 | |||
Remark: (1) *Decreasing linearly with logarithm of the frequency. (2) The lower limit shall apply at the transition frequency.
3.2. Test Setup
A diagram shows a conducted emission test setup within a shielding room. The EUT (E-1) is connected via USB to an Adapter (E-2), which is connected to an AC Line. A LISN (Line Impedance Stabilization Network) is used for both Live and Neutral lines. A Test Receiver is connected to the LISN. The setup includes a Ground Reference Plane. Dimensions shown are 0.8m height for the table and 1.5m length for the setup area.
3.3. Test Procedure
The EUT system is connected to the power mains through a line impedance stabilization network (L.I.S.N.). This provides a 50ohm coupling impedance for the EUT system. Please refer the block diagram of the test setup and photographs. Both sides of AC line are checked to find out the maximum conducted emission. In order to find the maximum emission levels, the relative positions of equipment and all of the interface cables shall be changed according to FCC ANSI C63.10-2013 on Conducted Emission Measurement. The bandwidth of test receiver (ESCI) set at 9kHz. The frequency range from 150kHz to 30MHz is checked.
3.4. Test Data
Conducted Emission Test Data - Live Line (AC 120V, 60Hz for adapter)
Test Site: 1# Shielded Room. Operating Condition: Keeping TX+ Charging Mode. Test Specification: AC 120V, 60Hz for adapter. Comment: Live Line. Temperature: 22.5°C, Humidity: 59%.
A spectrum analyzer plot shows the frequency range from 0.150 kHz to 30.000 MHz. The Y-axis represents RF Line Voltage in dBuV. Limit lines for Quasi-Peak (QP) and Average (AVG) detectors are shown. Several data points are listed in the table below:
| No. | Freq. (MHz) | Reading (dBuV) | Factor (dB) | Result (dBuV) | Limit (dBuV) | Over Limit (dB) | Detector | Remark |
|---|---|---|---|---|---|---|---|---|
| 1 | 0.1740 | 29.13 | 19.90 | 49.03 | 64.76 | -15.73 | QP | |
| 2 | 0.2580 | 20.32 | 19.89 | 40.21 | 61.49 | -21.28 | QP | |
| 3 | 0.4940 | 14.29 | 19.98 | 34.27 | 56.10 | -21.83 | QP | |
| 4 | 0.5860 | 14.24 | 20.00 | 34.24 | 56.00 | -21.76 | QP | |
| 5 | 1.0380 | -2.28 | 20.12 | 17.84 | 46.00 | -28.16 | AVG | |
| 6 | 1.4380 | -2.69 | 20.13 | 17.44 | 46.00 | -28.56 | AVG | |
| 7 | 2.0220 | 12.78 | 20.13 | 32.91 | 56.00 | -23.09 | QP | |
| 8 | 2.9660 | 12.43 | 20.14 | 32.57 | 56.00 | -23.43 | AVG | |
| 9 | 3.7700 | -3.25 | 20.18 | 16.93 | 46.00 | -29.07 | AVG | |
| 10 | 4.8380 | -3.55 | 20.20 | 16.65 | 46.00 | -29.35 | AVG |
Conducted Emission Test Data - Neutral Line (AC 120V, 60Hz for adapter)
Test Site: 1# Shielded Room. Operating Condition: Keeping TX+ Charging Mode. Test Specification: AC 120V, 60Hz for adapter. Comment: Neutral Line. Temperature: 22.5°C, Humidity: 59%.
A spectrum analyzer plot shows the frequency range from 0.150 kHz to 30.000 MHz. The Y-axis represents RF Line Voltage in dBuV. Limit lines for Quasi-Peak (QP) and Average (AVG) detectors are shown. Several data points are listed in the table below:
| No. | Freq. (MHz) | Reading (dBuV) | Factor (dB) | Result (dBuV) | Limit (dBuV) | Over Limit (dB) | Detector | Remark |
|---|---|---|---|---|---|---|---|---|
| 1 | 0.1780 | 27.15 | 19.90 | 47.05 | 64.57 | -17.52 | QP | |
| 2 | 0.2260 | 20.32 | 19.89 | 40.21 | 59.76 | -19.55 | QP | |
| 3 | 0.3180 | 19.39 | 19.94 | 39.33 | 57.41 | -18.08 | QP | |
| 4 | 0.4220 | 17.95 | 20.03 | 37.98 | 56.00 | -18.02 | AVG | |
| 5 | 0.7780 | 17.01 | 20.06 | 37.07 | 56.00 | -18.93 | QP | |
| 6 | 0.8540 | 15.81 | 20.07 | 35.88 | 56.00 | -20.12 | QP | |
| 7 | 1.0580 | -1.67 | 20.13 | 18.46 | 46.00 | -27.54 | AVG | |
| 8 | 1.3619 | -2.52 | 20.13 | 17.61 | 46.00 | -28.39 | QP | |
| 9 | 1.9580 | -2.55 | 20.14 | 17.59 | 46.00 | -28.41 | AVG | |
| 10 | 2.7180 | -2.91 | 20.15 | 17.24 | 46.00 | -28.76 | AVG | |
| 11 | 3.7700 | -3.25 | 20.18 | 16.93 | 46.00 | -29.07 | AVG | |
| 12 | 4.0020 | -3.15 | 20.19 | 17.04 | 46.00 | -28.96 | AVG |
Conducted Emission Test Data - Live Line (AC 240V, 60Hz for adapter)
Test Site: 1# Shielded Room. Operating Condition: Keeping TX+ Charging Mode. Test Specification: AC 240V, 60Hz for adapter. Comment: Live Line. Temperature: 22.5°C, Humidity: 59%.
A spectrum analyzer plot shows the frequency range from 0.150 kHz to 30.000 MHz. The Y-axis represents RF Line Voltage in dBuV. Limit lines for Quasi-Peak (QP) and Average (AVG) detectors are shown. Several data points are listed in the table below:
| No. | Freq. (MHz) | Reading (dBuV) | Factor (dB) | Result (dBuV) | Limit (dBuV) | Over Limit (dB) | Detector | Remark |
|---|---|---|---|---|---|---|---|---|
| 1 | 0.1580 | 25.14 | 19.90 | 45.04 | 65.56 | -20.52 | QP | |
| 2 | 0.2260 | 19.89 | 19.89 | 39.78 | 52.59 | -12.81 | QP | |
| 3 | 0.3180 | 19.39 | 19.94 | 39.33 | 59.76 | -20.43 | QP | |
| 4 | 0.4300 | -1.11 | 20.05 | 18.94 | 56.00 | -37.06 | AVG | |
| 5 | 0.7780 | 16.96 | 20.06 | 37.02 | 56.00 | -18.98 | QP | |
| 6 | 0.8980 | 17.17 | 20.09 | 37.26 | 56.00 | -18.74 | QP | |
| 7 | 1.5020 | 18.83 | 20.13 | 38.96 | 56.00 | -17.04 | QP | |
| 8 | 1.5020 | -1.67 | 20.13 | 18.46 | 46.00 | -27.54 | AVG | |
| 9 | 2.0180 | -2.37 | 20.14 | 17.77 | 46.00 | -28.23 | AVG | |
| 10 | 2.6340 | -2.46 | 20.15 | 17.69 | 46.00 | -28.31 | AVG | |
| 11 | 3.1180 | -3.24 | 20.16 | 16.92 | 46.00 | -29.08 | AVG | |
| 12 | 4.2980 | -3.15 | 20.19 | 17.04 | 46.00 | -28.96 | AVG |
Conducted Emission Test Data - Neutral Line (AC 240V, 60Hz for adapter)
Test Site: 1# Shielded Room. Operating Condition: Keeping TX+ Charging Mode. Test Specification: AC 240V, 60Hz for adapter. Comment: Neutral Line. Temperature: 22.5°C, Humidity: 59%.
A spectrum analyzer plot shows the frequency range from 0.150 kHz to 30.000 MHz. The Y-axis represents RF Line Voltage in dBuV. Limit lines for Quasi-Peak (QP) and Average (AVG) detectors are shown. Several data points are listed in the table below:
| No. | Freq. (MHz) | Reading (dBuV) | Factor (dB) | Result (dBuV) | Limit (dBuV) | Over Limit (dB) | Detector | Remark |
|---|---|---|---|---|---|---|---|---|
| 1 | 0.1580 | 27.40 | 19.90 | 47.30 | 65.56 | -18.26 | QP | |
| 2 | 0.2940 | 20.72 | 19.89 | 40.61 | 60.41 | -19.80 | QP | |
| 3 | 0.4300 | -1.11 | 19.95 | 18.84 | 47.25 | -28.41 | AVG | |
| 4 | 0.7460 | 18.57 | 20.05 | 38.62 | 56.00 | -17.38 | QP | |
| 5 | 0.7900 | 21.54 | 20.06 | 41.60 | 56.00 | -14.40 | QP | |
| 6 | 0.7980 | -1.57 | 20.07 | 18.50 | 46.00 | -27.50 | AVG | |
| 7 | 1.5020 | 18.83 | 20.13 | 38.96 | 56.00 | -17.04 | QP | |
| 8 | 1.5020 | -1.95 | 20.13 | 18.18 | 46.00 | -27.82 | AVG | |
| 9 | 2.0180 | -2.37 | 20.14 | 17.77 | 46.00 | -28.23 | AVG | |
| 10 | 3.1180 | -3.24 | 20.16 | 16.92 | 46.00 | -29.08 | AVG | |
| 11 | 4.3580 | -3.14 | 20.19 | 17.05 | 46.00 | -28.95 | AVG |
4. Radiation Spurious Emission and Band Edge
4.1. Test Standard and Limit
| Test Standard | Frequency (MHz) | Field strength (microvolt/meter) | Limit (dBuV/m) | Remark | Measurement distance (m) |
|---|---|---|---|---|---|
| FCC Part15 C Section 15.209 and 15.205 | 0.009MHz~0.490MHz | 2400/F(kHz) | - | - | 300 |
| 0.490MHz-1.705MHz | 24000/F(kHz) | - | - | 30 | |
| 1.705MHz-30MHz | 30 | 40.0 | Quasi-peak | 30 | |
| 30MHz~88MHz | 100 | 43.5 | Quasi-peak | 3 | |
| 88MHz~216MHz | 150 | 46.0 | Quasi-peak | 3 | |
| 216MHz~960MHz | 200 | 54.0 | Quasi-peak | 3 | |
| 960MHz~1000MHz | 500 | 54.0 | Average | 3 | |
| Above 1000MHz | 500 | 74.0 | Peak | 3 |
Remark: (1)The lower limit shall apply at the transition frequency.
(2) 15.35(b), Unless otherwise specified, the limit on peak radio frequency emissions is 20dB above the maximum permitted average emission limit applicable to the equipment under test. This peak limit applies to the total peak emission level radiated by the device.
| Test Standard | Frequency (MHz) | Field Strength of fundamental ((millivolts/meter) | Field Strength of Harmonics (microvolts/meter) | Limit (dBuV/m) | Remark | Measurement distance (m) |
|---|---|---|---|---|---|---|
| FCC Part15 C Section 15.249 | 902~928 | 50 | - | 94.0 | Average | 3 |
| - | 114.0 | Peak | 3 |
Remark: (1) 15.35(b), Unless otherwise specified, the limit on peak radio frequency emissions is 20dB above the maximum permitted average emission limit applicable to the equipment under test. This peak limit applies to the total peak emission level radiated by the device.
4.2. Test Setup
Figure 1. Below 30MHz: A diagram shows the EUT placed on a table 0.8m above a metal full soldered ground plane. A system simulator is connected. The setup is 3m away from an RX Antenna, which is 1m high and connected to a Spectrum Analyzer / Receiver.
Figure 2. 30MHz to 1GHz: A diagram shows the EUT placed on a table 0.8m above a metal full soldered ground plane. A system simulator is connected. The setup is 3m away from an RX Antenna, which has an antenna feed point and is positioned 1-4m away. The antenna is connected to a Spectrum Analyzer / Receiver.
Figure 3. Above 1GHz: A diagram shows the EUT placed on a turntable 1.5m above a metal full soldered ground plane. A system simulator is connected. The setup is 3m away from an RX Antenna, which has an antenna feed point and is positioned 1-4m away. The antenna is connected to a Spectrum Analyzer / Receiver.
4.3. Test Procedure
For below 1GHz: The EUT is placed on a turntable, which is 0.8m above the ground plane.
For above 1GHz: The EUT is placed on a turntable, which is 1.5m above the ground plane.
The turn table can rotate 360 degrees to determine the position of the maximum emission level. The EUT is set 3 meters away from the receiving antenna which is mounted on an antenna tower. The antenna can be moved up and down from 1 to 4 meters to find out the maximum emission level. Rotated the EUT through three orthogonal axes to determine the maximum emissions, both horizontal and vertical polarization of the antenna are set on test. The EUT is tested in 9*6*6 Chamber. The device is evaluated in xyz orientation.
For the radiated emission test above 1GHz: Place the measurement antenna away from each area of the EUT determined to be a source of emissions at the specified measurement distance, while keeping the measurement antenna aimed at the source of emissions at each frequency of significant emissions, with polarization oriented for maximum response. The measurement antenna may have to be higher or lower than the EUT, depending on the radiation pattern of the emission and staying aimed at the emission source for receiving the maximum signal. The final measurement antenna elevation shall be restricted to a range of heights of from 1 m to 4 m above the ground or reference ground plane.
For 9kHz to 150kHz: Set the spectrum analyzer as: RBW = 200Hz, VBW =1kHz, Detector= Quasi-Peak, Trace mode= Max hold, Sweep- auto couple.
For 150kHz to 30MHz: Set the spectrum analyzer as: RBW = 9KHz, VBW =30kHz. Detector= Quasi-Peak, Trace mode= Max hold, Sweep- auto couple.
For above 1GHz: Set the spectrum analyzer as: RBW =1MHz, VBW =1MHz, Detector= Peak, Trace mode= Max hold, Sweep- auto couple. RBW =1MHz, VBW =10Hz, Detector= Average, Trace mode= Max hold, Sweep- auto couple.
4.4. Test Data
During the test, Pre-scan all kind of the place mode (X-axis, Y-axis, Z-axis), and found the X-axis is the worst case.
The test results of 9kHz-30MHz was attenuated more than 20dB below the permissible limits, so the results don't record in the report.
Radiated Emission Test Data (30MHz-1000MHz)
Job No.: SZAWW180522002-01. Test Site: 1# Shielded Room. Operating Condition: Keeping TX+ Charging Mode. Test Specification: FCC PART 15C. Power Source: AC 120V, 60Hz for adapter. Temp.(°C)/Hum.(%RH): 24.3°C/55%RH. Polarization: Horizontal.
A spectrum analyzer plot shows the frequency range from 30.000 to 1000.000 MHz. The Y-axis represents dBuV/m. Limit lines for Quasi-Peak (QP) are shown. Several data points are listed in the table below:
| No. | Freq. (MHz) | Reading (dBuV/m) | Factor (dB/m) | Result (dBuV/m) | Limit (dBuV/m) | Over Limit (dB) | Detector | Height (cm) | Degree (deg) | Remark |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 89.9047 | 41.92 | -23.23 | 18.69 | 43.50 | -24.81 | QP | 300 | 0 | |
| 2 | 121.9755 | 38.77 | -21.40 | 17.37 | 43.50 | -26.13 | QP | 300 | 26 | |
| 3 | 230.9068 | 37.73 | -18.32 | 19.41 | 46.00 | -26.59 | QP | 300 | 47 | |
| 4 | 359.1860 | 34.11 | -13.70 | 20.41 | 46.00 | -25.59 | QP | 300 | 103 | |
| 5 | 524.5541 | 34.52 | -11.02 | 23.50 | 46.00 | -22.50 | QP | 300 | 202 | |
| 6 | 916.0687 | 86.13 | -4.52 | 81.61 | 94.00 | -12.39 | QP | 300 | 360 |
Radiated Emission Test Data (Above 1000MHz)
Test Site: 1# Shielded Room. Operating Condition: Keeping TX+ Charging Mode. Test Specification: FCC PART 15C. Power Source: AC 120V, 60Hz for adapter. Temp.(°C)/Hum.(%RH): 24.3°C/55%RH. Polarization: Vertical.
A spectrum analyzer plot shows the frequency range from 30.000 to 1000.000 MHz. The Y-axis represents dBuV/m. Limit lines for Quasi-Peak (QP) are shown. Several data points are listed in the table below:
| No. | Freq. (MHz) | Reading (dBuV/m) | Factor (dB/m) | Result (dBuV/m) | Limit (dBuV/m) | Over Limit (dB) | Detector | Height (cm) | Degree (deg) | Remark |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 58.8185 | 40.36 | -15.93 | 24.43 | 40.00 | -15.57 | QP | 300 | 0 | |
| 2 | 83.5222 | 40.24 | -18.48 | 21.76 | 40.00 | -18.24 | QP | 300 | 26 | |
| 3 | 110.1816 | 33.36 | -14.63 | 18.73 | 43.50 | -24.77 | QP | 300 | 103 | |
| 4 | 178.1327 | 37.10 | -15.98 | 21.12 | 43.50 | -22.38 | QP | 300 | 202 | |
| 5 | 262.8955 | 32.90 | -13.80 | 19.10 | 46.00 | -26.90 | QP | 300 | 360 | |
| 6 | 916.0687 | 84.56 | -4.52 | 80.04 | 94.00 | -13.96 | QP | 300 | 360 |
5. 20dB Bandwidth Test
5.1. Test Standard and Limit
| Test Standard |
|---|
| FCC Part15 C Section 15.249 |
5.2. Test Setup
A diagram shows a test setup for bandwidth measurement. The EUT is connected via a low loss RF cable to a Spectrum Analyzer.
5.3. Test Procedure
1. Place the EUT on the table and set it in the transmitting mode.
2. Remove the antenna from the EUT and then connect a low loss RF cable from the antenna port to the spectrum analyzer.
3. Set the spectrum analyzer as: RBW = 100kHz, VBW ≥3*RBW =300kHz, Detector= peak, Trace mode= Max hold, Sweep- auto couple.
4. Mark the peak frequency and -20dB (upper and lower) frequency.
5. Repeat until all the rest channels are investigated.
5.4. Test Data
Test Item: 20dB Bandwidth. Test Voltage: AC 120V, 60Hz for adapter. Test Result: PASS. Test Mode: TX Mode. Temperature: 24°C. Humidity: 55%RH.
| Frequency (MHz) | Bandwidth (kHz) | Result |
|---|---|---|
| 916.438381 | 198.9 | PASS |
| 921.438381 | 199.5 | PASS |
| 927.438381 | 198.6 | PASS |
Spectrum Analyzer Plots:
CH: Low
A spectrum analyzer plot shows the occupied bandwidth for channel Low. Center Frequency: 916.366000 MHz. Occupied Bandwidth: 193.61 kHz. Transmit Freq Error: 435 Hz. x dB Bandwidth: 198.9 kHz. Total Power: 16.6 dBm. % of OBW Power: 99.00%. x dB: -20.00 dB.
CH: Middle
A spectrum analyzer plot shows the occupied bandwidth for channel Middle. Center Frequency: 921.366000 MHz. Occupied Bandwidth: 193.21 kHz. Transmit Freq Error: 722 Hz. x dB Bandwidth: 199.5 kHz. Total Power: 16.2 dBm. % of OBW Power: 99.00%. x dB: -20.00 dB.
CH: High
A spectrum analyzer plot shows the occupied bandwidth for channel High. Center Frequency: 927.366000 MHz. Occupied Bandwidth: 193.86 kHz. Transmit Freq Error: 929 Hz. x dB Bandwidth: 198.6 kHz. Total Power: 16.6 dBm. % of OBW Power: 99.00%. x dB: -20.00 dB.
6. Antenna Requirement
6.1. Test Standard and Requirement
| Test Standard | Requirement |
|---|---|
| FCC Part15 Section 15.203 | 1) 15.203 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, 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 a Cylindrical antenna which permanently attached, and the best case gain of the antenna is 1.5 dBi. It complies with the standard requirement.
Note: The antenna will eventually be held in place by glue so that it cannot be opened. It cannot be opened by the user.
A photograph shows the telemetry module with its attached cylindrical antenna, alongside a ruler for scale. The antenna extends approximately 5 cm from the module. The ruler markings go up to 15 cm.
Appendices
APPENDIX I -- TEST SETUP PHOTOGRAPH
Photo of Conducted Emission Test: A photograph shows the conducted emission test setup. It includes a test receiver, EUT, adapter, and LISN, all connected and arranged on a table within a shielded room.
Photo of Radiation Emission Test: A photograph shows the radiated emission test setup in an anechoic chamber. It includes a turntable with the EUT, an antenna (possibly a biconical or log-periodic type), and a spectrum analyzer/receiver.
APPENDIX II -- EXTERNAL PHOTOGRAPH
Two photographs show the external views of the telemetry module. The first photograph shows the module with its antenna extended, placed next to a ruler marked in centimeters, indicating a length of approximately 5 cm for the antenna. The second photograph shows the module from a different angle, also with a ruler for scale. The module has text labels such as "TELEMETRY RADIO 915 MHz 100 mW" and "Holybro".
APPENDIX III -- INTERNAL PHOTOGRAPH
Two photographs show the internal components of the telemetry module. The first photograph displays the main circuit board with various electronic components, a connector, and the antenna attachment point. A ruler indicates the dimensions. The second photograph shows another view of the internal circuitry, highlighting chips and connectors. The board is labeled with "HT03-V2.0".
