Ⅰ. Overview
1. Product Features
（1）The YL20 Video Transmission Box, equipped with the G-series receiver series, adopts an all-new high-power, high-bandwidth 2.4/5.8G dual-band wireless module and antenna. It supports automatic frequency hopping and independent dynamic MCS adjustment, delivering sharper images, lower latency, longer transmission distance and stronger anti-interference performance, while greatly enhancing the communication capability under weak signal conditions. It can be seamlessly and flexibly applied to UAVs, robots, and industrial control equipment alike.
（2）G-series receivers (e.g., the GR01 Receiver and G12RX Receiver) are equipped with a rich array of interfaces including Ethernet port, serial port transparent transmission, and SBUS output. They support the connection of video devices such as Ethernet port (144 network segment) cameras, gimbals and pods. Ideal for aerial photography, security, fire protection, power utilities, surveying and mapping robots, border defense and other scenarios, they deliver an immersive on-site experience. Meanwhile, they are compatible with mainstream open-source flight controller ground stations for PC: MP (MissionPlanner) and QGC (QGroundControl).
（3）The interfaces of the YL20 Video Transmission Box are as follows: The RJ45 Ethernet port features universal applicability, stability and reliability; the PPM input interface (master mode)/SBUS output (slave mode) and XT60 interface enable flexible compatibility with third-party devices. The box’s antenna interface adopts SMA type with external thread and internal pin, while the antenna rod end interface uses SMA type with internal thread and internal hole, boasting high precision, excellent reliability and outstanding stability.
（4）Constructed with industrial-grade aluminum alloy for an exceptional grip, it ensures high repeat precision, outstanding stability and efficient heat dissipation. It runs stably and smoothly even in harsh outdoor conditions, safeguarding all your on-site applications.
2.Applications
Connected with a separated remote controller to the video transmission box, it controls helicopters, fixed-wing UAVs, multi-rotors, vehicles and boats via receiver. It also supports video, image and data transmission when connected to a computer.
Note: YL20 is compatible exclusively with G series receiver, not other models.
3.Types, Specifications & Parameters
| YL20 Video transmission box Parameters | |||
| Product Model | YL20 Video transmission box | Channels | PPM in 8/SBUS out 16 （Refer to the remote control） |
| Operating Voltage | 7.2V-80V | RF Power | 23dBm@CE/FCC |
| Frequency | 2.4G：2400-2476MHz, 5.8G：5725-5829MHz | Dynamic Frequency Hopping | Automatic Frequency Hopping |
| Dimensions | 66 (L) × 19.7 (W) × 93.6 (H) mm (excluding antenna) | Weight | 160.5g(antenna 33.5g Box only127g) |
| Power | Maximum peak power is less than 3.6W （12V300MA） | Interface Type | Type-C interface, RJ45 Ethernet interface, SBUS/PPM input interface (model: GH1.25), XT60 interface, antenna interface on the box side (SMA type with external thread and internal pin) |
| Operating Temperature | (-10℃~60℃) | ||
| Applications | Helicopters, Fixed-wing Aircraft, Multirotors, Vehicles & Vessels | ||
| GR01 receiver parameters | |||
| Operating Frequency Band | 2.4G/5.8G | Baud Rate (Serial) | 57600/115200/921600 |
| Supply Voltage | 7.2～80V(XT30) | Operating Current | 12V/300mA |
| Data Transmission Port | 11 Channel | Air Interface Rate | Upstream rate : 200 kbps Downstream rate: 15 Mbps |
| Ethernet Port | 1 channel | Dimension | 45.5×60×21.5mm |
| SBUS output | 1 channel | Weight | 37g |
| PWM interface | 3 channels | Operating Temperature | (-10℃~60℃) |
| RF Power | 23dBm@CE/FCC | Channel Bandwidth | 1.25MHz/2.5MHz/5MHz/ 10MHz/20MHz/40MHz |
| G12 receiver parameters | |||
| Frequency band | 2.4G/5.8G | Baud Rate (Serial) | 57600/115200/921600 |
| Supply Voltage | 5V | Operating Current | 5V/720mA |
| Data Transmission Port | 1 channel | Air Interface Rate | Upstream rate : 200 kbps Downstream rate: 15 Mbps |
| Ethernet Port | 1 channel | Dimension | 51×40.8×23.3mm |
| SBUS output | 1 channel | Weight | 45g |
| PWM interface | 3 channels | Operating Temperature | (-10℃~60℃) |
| RF Power | 23dBm@CE/FCC | Channel Bandwidth | 1.25MHz/2.5MHz/5MHz/ 10MHz/20MHz/40MHz |
4.Model Composition & Definition
| Number | Annotation | Number | Annotation |
| 1 | RJ45 LAN | 2 | SBUS IN and OUT/PPM IN |
| 3 | Type-c (DEBUG) | 4 | Dual-band Antenna(SMA Inner Hole) |
| 5 | None | 6 | Slave Mode Indicator Light |
| 7 | Master Mode Indicator (Default) | 8 | Power (Red) / Pairing (Green) / PPM Input (Blue) LED |
| 9 | Master-slave Switch Button | 10 | Frequency binding Button |
| 11 | XT60 Power Input Port (7.2V~80V) | 12 | Internal Screw Hole(UNC 1/4-20) |
| Number | Annotation | Number | Annotation |
| 1 | Ethernet interface | 5 | Upgrade interface |
| 2 | Binding Expansion Port | 6 | PWM output |
| 3 | Binding Button | 7 | Data transmission interface + SBUS output |
| 4 | Power input port (7.2V~72V) | 8 | Antenna interface |
5. Port Definition Diagram
YL20 Video Transmission Box
Gr01 receiver
Note: PWM0~2 of GR01 correspond to channels 9~11 of the remote controller.
| Number | Annotation | Number | Annotation |
| ANT | Antenna Base (IPEX Gen 1) | ||
| LED | Frequency binding indicator light | ETH0_TX+ | Ethernet interface 0 |
| GND | Ground wire | ETH0_TX | |
| KEY | Frequency binding button | ETH0_RX+ | |
| PWM0 | PWM0 port (channel 9) | ETH0_RX | |
| PWM1 | PWM10 Port (Channel 10) | GND | Power + Data Transmission Port |
| GND | Ground wire | 5V_IN | |
| NC | Unconnected Pin | UART_RX | |
| DN | Upgrade port | UART_TX | |
| DP | GND | SBUS interface | |
| GND | SBUS | ||
| ANT | Antenna Base (IPEX Gen 1) | ||
6.Operating Environmental Conditions
Notes:
A）Ambient Temperature: -10°C ～55°C
B）Storage Temperature: -20°C ～60°C
C）Relative Humidity: ≤ 85%
D）Atmospheric Pressure: 86kPa~106kPa
E）The product shall be used in areas free of explosive mediums. The surrounding medium shall not contain gas and conductive mediums that corrode metals or damage insulation, nor shall it be filled with water vapor or severe mold.
F）Operating occasions should have facilities which can prevent rain, snow, wind, sand and dust. The shell of this product will generate heat during operation, which is normal. Do not use the product in a closed and poorly ventilated environment. If necessary, fan can be used for forced air cooling to assist heat dissipation.
Do not use this product in an environment where the temperature exceeds 60°C.
7.Safety
Warnings:
Beginners need to pay attention to below safety precautions! Please read carefully!
Do NOT fly when fatigued, intoxicated or in poor physical condition!
Do NOT fly in adverse weather such as rain or strong wind!
Do NOT fly near high-voltage lines, communication base stations, crowded areas or places with human activities!
Do NOT fly at airports and other officially designated no-fly zones！
Do NOT operate drones in crowded areas, parking lots or other areas where property damage or personal injury may be caused. Prior to flight, conduct equipment inspection of the drones and check whether the transceiver system and drones are in normal condition.
The SBUS/PPM input interface is a GH1.25 connector with a buckle safety lock function. During daily use, it will inevitably be affected by environmental humidity, dust, haze and other factors. To prevent wear ans tear, frequent plugging and unplugging of this connector should be avoided as much as possible.
The antenna of this product is a fragile component; excessive force shall be avoided to prevent damage.
8.Working mode
Power Supply Mode and Precautions
The ground unit of the YL20 Video Transmission Box and the air unit of the GR01 can be powered by a DC power supply or a lithium battery, with a supply voltage of 7.2–80V (2S–18S).
The ground unit of the YL20 Video Transmission Box and the air unit of the GR01 are wirelessly connected.
Master Mode: A single box paired with a single remote controller can be used to form the master mode for operation.
Slave Mode: Two YL20 Video Transmission Boxes are required for slave connection and combined use (Slave Mode needs to be enabled).
Note: In Master Mode, PPM input/SBUS input (RX) are available, with support for data transmission and video transmission functions.When set to Slave Mode, SBUS (TX) is in output mode (no PPM input), with no data transmission function, and only video transmission function is supported.
Ⅱ. Operation & Usage
1.Pre-use Preparation & Inspection
Notes:
(1) Ensure sufficient power of the power supply or battery before use.
(2) Users shall ensure that they do not operate the product while intoxicated or under the influence of drugs.
(3) Check the antenna if is positioned as required before use for optimal performance.
2.Installation Method
（1）Screw the antenna directly onto the SMA port of the video transmission box as shown in the pic below.
(2) Connection Diagram of Video Transmission Box with Remote Controller and Computer ,Optional Remote Controllers: H12PRO(Reverse the RT wiring of the standard PPM cable), H16, H30,G30, etc.
（3）Screw holes (Unified National Coarse Thread1/4-20) on the bottom of the
video transmission box allow for tripod mounting.
（4）Usage Diagram of the Video Transmission Box
The YL20 is paired with the GR01 in Master Mode.
The YL20 in Master Mode is paired with another YL20 in Slave Mode for operation.
Correct Operation
Antenna Upward:
Incorrect Operation:
Do NOT place sideways, flat or upside down.
The antenna shall not be shielded. For example, when using the video transmission box indoors to connect to an outdoor UAV for long-distance flight.
Receiver Antenna Installation: Keep away from the main board, mount vertically upward and ensure no obstruction.
Correct Operation:
Mount under the arm of the aircraft
Incorrect Operation:
Do NOT place it inside the main board.
Do NOT place it close to carbon fiber or metal materials.
Do NOT cross the antennas or place them between the main board and the water bottle.
3.Operating Method
Binding Operation for Master Mode:
①Power on the video transmission box and receiver separately with DC 7.2-80V (2S-18S); the power indicator will stay steadily red. And wait for 20 seconds, press and hold the SET pairing button on the receiver until the blue indicator flashes, then release the button.
②After the YL20 Video Transmission Box is powered on, the power LED remains steadily red. Wait for the master mode LED (green) to stay steadily lit, then press and hold the pairing button for 3 seconds to enter pairing mode, where the power LED flashes rapidly green. Wait for successful pairing (i.e., the pairing LED/power LED of both the receiver and the video transmission box turn to steady green).
Switch Master/Slave
One of the video transmission boxes can be set to Slave Mode.
Switch Master Mode to Slave Mode
After the video transmission box is powered on, wait for the master mode LED (green) to stay steadily lit. Press and hold the master-slave button for 4 seconds until the indicator LEDs enter the running light mode and flash in sequence, then release the button. Wait for the flashing to end and the slave mode LED to stay steadily lit—the box is now in Slave Mode.
The same operation can be used to switch back to Master Mode.
Binding Operation for Slave Mode
Master Unit: Refer to Pairing Operation for Master Mode,
Step ② on the previous page.
Slave Unit: After the YL20 Video Transmission Box is powered on, the power LED remains steadily red. Wait for the slave mode LED (green) to stay steadily lit, then press and hold the pairing button for 3 seconds to enter pairing mode, where the power LED flashes rapidly green. Wait for successful pairing (i.e., the pairing LED/power LED of both the master unit and the slave unit turn to steady green at Step ⑧).
4. Control
Master Mode
（1）Open-Source PIX Flight Controller SBUS + Data Transmission Connection Diagram
Wiring for Video Transmission Box (Master Unit)
Use the standard audio cable provided to connect the video transmission box to the remote controller for operation. (Standard cable length: 1 meter, maximum supported cable length: 3–5 meters)
Note: The remote controller is required to be purchased separately. You may choose any model that supports PPM output, such as H12, H12PRO(Reverse the RT wiring of the standard PPM cable), H16, H30, G30 and others. The pairing indicator will glow solid blue when PPM input is active.
Slave Mode
(1) See the Wiring for Video Transmission Box (Master Unit) on this page for the master unit connection diagram.
(2) Slave unit connection: Open-Source PIX Flight Controller SBUS Connection Diagram
Note: The slave unit’s SBUS (TX) is in output mode and connects to the flight controller’s SBUS port (slave unit connection cable to be prepared by the user).No data transmission function is available in Slave Mode.
5. Video Transmission & Data Transmission
（1）Wiring Diagram for Computer to Video Transmission Box Connection
（2）Open Computer Settings → Select Network Adapter → Select Ethernet → Select IPv4 Protocol → Set Custom IP → Enter as shown in the pic → Click Confirm (see pic below)
The network segment of the Ethernet port camera must be pre-configured to the 144 network segment (192.168.144.XXX). Connect the camera to the Ethernet port of the receiver; the pin definition is referred to the section 1.
Overview -> 5. Port Definition Diagram in this document.
GR01 Receiver to Gimbal Connection Diagram: (The same connection cable can be used for the GR01 Receiver and S1PRO; the cable must be ordered together with the kit.)
Slave Unit Connection Diagram:
Displaying Video Transmission on QGC (Computer Side)
(1) Click and select General;
(2)Open Source and select RTSP Video Stream;
(3)Enter the RTSP address of the Ethernet camera in the RTSP URL field.
RTSP Address for C10PRO/LAN Three-Body Image (C10PRO connection required): rtsp://192.168.144.108:554/stream=0。
RTSP Addresses for C12 Dual-Light Camera:
rtsp://192.168.144.108:554/stream=1
rtsp://192.168.144.108:555/stream=2
C20：rtsp://192.168.144.108:554/main
For third-party cameras, enter the corresponding RTSP pull stream address of the camera in the field below.
Note: The camera network segment must be set to the 144 network segment. For installing a third-party Ethernet pod camera, you need to obtain the RTSP address from the camera manufacturer and set the camera to the 144 network segment. After configuring the RTSP address, the video transmission feed can be viewed.
Displaying Video Transmission on VLC (Computer Side)
Note: Only one of the two software programs (QGC or VLC) is required for video transmission playback.
Connect the Ethernet cable as instructed above.
Download the VLC software on your computer (Download link: https://www.videolan.org).
Open VLC this software and set a static Ethernet IP address.
(1) Launch the VLC media playeer on your computer, go to the Media menu and select Open Network Stream.
(2) In the Network URL input field, enter rtsp://192.168.144.108:554/stream=0. For third-party cameras that only support stream pulling, configure the custom settings first, then enter the corresponding RTSP pull stream address of the camera in the field below.
Note: Camera network segment must be set to 144 network segment.
(3) Click Play
(4) Confirm successful video transmission connection.
Data Transmission
Flight controllers with open-source firmware can be connected to the serial port via a data transmission cable, and the SBUS cable shall be connected to the SBUS input port of the flight controller.
(1) Open-Source PIX Flight Controller SBUS + Data Transmission Connection Diagram:
For other flight controllers, refer to the corresponding user manual for connection instructions.
（2）Open the Mission Planner ground station software on your computer and select UDPCI as the connection method.
（3）Enter the address 192.168.144.101 and click OK upon completion.
(4) After clicking Connect, enter the port number 14551 and click OK to establish the connection upon completion.
Note: If the connection fails, check and reverse the wiring of the data transmission cable between the receiver and the flight controller: connect the receiver’s RX to the flight controller’s TX, the receiver’s TX to the flight controller’s RX, and GND to GND. The receiver baud rate is 921600. For the baud rate setting of the data transmission port on the flight controller, please consult the flight controller technical support for confirmation and set it to 921600.
You can enter ping 192.168.144.101 in the Command Prompt to check if the connection is successful. Ensure that the computer firewall is disabled.
Connecting Data Transmission via QGC
Open the QGC software: 1) Click the top-left corner; 2) Click Application Settings in the pop-up window.
Click Comm Links.
①Enter a custom name for the connection.
②Select the Auto-connect on startup.
③Type (Connection Method): Open the drop-down menu and select UDP.
④Port：Set it to 14551
⑤Under Server Addresses, enter the data transmission IP address in the input box: 192.168.144.101.
⑥Click Add Server.
⑦Click Confirm.
Note:If the connection fails, check and reverse the wiring of the data transmission cable between the receiver and the flight controller: connect the receiver’s RX to the flight controller’s TX, the receiver’s TX to the flight controller’s RX, and GND to GND. The baud rate of the receiver is 921600. For the baud rate setting of the data transmission port on the flight controller, please consult the flight controller technical support for confirmation and set it to 921600.
You can enter ping 192.168.144.101 in the Command Prompt to verify network connectivity. Make sure that the computer firewall is disabled.
6.FAQ & Solutions
(1) How to obtain RTSP Address of a third-party LAN camera?
The network segment of the Ethernet camera must be configured to the 144 network segment in advance (IP: 192.168.144.XXX, Gateway: 192.168.144.1).
Connect the camera to Ethernet Port 0 or Port 1 of the receiver. For the pin definition, refer to the section 1. Overview -> 5. Port Definition Diagram in this document. You can first connect the Ethernet camera to a computer, and use VLC media player on the computer to pull the stream via an RTSP address in the 144 network segment. Note: This RTSP address needs to be obtained from the camera manufacturer. After confirming the stream can be pulled successfully, connect the camera to the receiver. Open VLC on the computer, enter the RTSP based pull stream address and test whether the video can be played normally.
(2) Failed to share video transmission stream?
Kindly verify that the network cable is securely connected to the video transmission box, the Ethernet is set with a static IP in the 144 network segment, and the RTSP address on the computer is correct.
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