Best Drone Radio Transmitter and Receiver Module for video data telemetry

The Vcan2122 is a compact, medium-power bidirectional wireless data transmission module designed for reliable long-range communication in complex and interference-prone environments. Based on OFDM TDD wireless communication technology, it delivers strong anti-interference capability, excellent penetration performance, and highly stable data transmission.

The module supports multiple transmission modes, including point-to-point, point-to-multipoint, and trunk communication, and enables star network topologies with up to 16 nodes in a single network. Thanks to its miniaturized design, low power consumption, and multiple data interfaces, Vcan2122 is well suited for mobile, airborne, and embedded applications where reliability and flexibility are critical.

The Vcan2122 is by default available in a wideband configuration, operating over a frequency range of 1420–1530 MHz. Within this single continuous band, the module provides up to 110 MHz of selectable frequency range, enabling automatic frequency hopping with significantly greater flexibility to avoid interference and maintain stable links in complex RF environments.

In addition to the wideband version, optional single-band variants are also available in the following frequency ranges: 806–825.9 MHz, 1427.9–1467.9 MHz, 2401.5–2481.4 MHz. Each optional variant supports single-band operation only.

Under good line-of-sight (LOS) air-to-ground conditions, the transmission distance can reach 10-20 km or more, depending on high gain antenna configuration and external power amplifier support.

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Features

• Star Networking Capability
  Supports point-to-multipoint communication with up to 16 nodes.

• High Bandwidth Transmission
  Maximum data rate up to 30 Mbps @ 20 MHz.

• Flexible Channel Bandwidth
  Supports 3 / 5 / 10 / 20 MHz bandwidth modes.

• Automatic Frequency Selection
  Automatically detects interference and selects the optimal frequency point in real time.

• Multi-System Coexistence
  Multiple Vcan2122 systems can operate simultaneously on fixed frequencies.

• Multiple Data Interfaces
  Integrated dual 100 Mbps Ethernet ports and TTL / RS232 / SBUS serial interfaces.

• Low Latency
  End-to-end transmission delay ≤ 20 ms.

• Secure Communication
  Supports AES-128 encryption.

• Compact & Lightweight Design
  Only 35 g, suitable for UAVs and other weight-sensitive platforms.

• Web UI page to configuration the parameter.
  Provide a user-friendly web UI for configuring module parameters. Users can easily manage settings and modify parameters visually through the web page, without the need for complex AT commands or command-line instructions.

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Specifications

System Parameters

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Channel Bandwidth & Sensitivity

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Interfaces

• Power Interface: XT30, DC 9–15 V

• Antenna Interface: IPEX ×2

  • MAIN: Must be connected

  • AUX: Receive diversity only

• Data Interfaces:

  • Ethernet: 100 Mbps ×2

  • Serial: TTL ×2, RS232 ×1, SBUS ×1

Interface definition

Linear order	Pin name	Interface definition	Interface description	Signal direction
1	TXP1+	Ethernet 1	TX+	O
	TXM1-		TX-	O
	RXP1+		RX+	I
	RXM1-		RX-	I
2	TXP2+	Ethernet 2	TX+	O
	TXM2-		TX-	O
	RXP2+		RX+	I
	RXM2-		RX-	I
3	TX1	Serial port 1 TTL	TX	O
	RX1		RX	I
	GND		ground	O
4	TX2	Serial port 2 TTL	TX	O
	RX2		RX	I
	GND		ground	O
5	TX3	Serial port 3 RS232	TX	O
	RX3		RX	I
	GND		ground	O
6	TX4	Serial port 4 SBUS	SBUS-OUT	O
	RX4		SBUS-IN	I
	GND		ground	O
7	PWR	DC 9~15V	Power positive	I
	GND		Power negative	I

We can also convert one TTL port to RS422, and additionally, we can add an RS232-to-RS485 converter board to support RS485, which is commonly used for camera PTZ control.

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Status Indicators

Module type	Mode	light status
		PWR	MODE	LAN1 LAN2	RSSI 123
master	unsynchronized	Powered on	red light Powered on	Data is being transmitted and blinking	Searching
master	synchronized	Powered on	green light Powered on	Data is being transmitted and blinking	Proportional to the strength of the received signal
slave	unsynchronized	Powered on	red light Powered on	Data is being transmitted and blinking	Searching
slave	synchronized	Powered on	green light Powered on	Data is being transmitted and blinking	Proportional to the strength of the received signal

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When the primary (Master, Ground Unit, Receiver) and secondary devices (Salve, Air Unit, Transmitter) are not synchronized, the PWR (power) indicators on both devices remain steadily lit. The MODE indicator is red on the primary device and green on the secondary device. At this time, the RSSI lights on both devices are in a searching state.

Once the master and slave devices are synchronized, the RSSI lights display the received signal strength for each device. When data is being sent or received over the network, the LAN1 indicators on both devices light up, while the LAN2 indicators blink to indicate network activity.

Applications

The Vcan2122 is suitable for a wide range of professional wireless data transmission applications, including:

• UAV / Drone Data Links

• Firefighting & Emergency Communication

• Public Security & Law Enforcement

• Inspection & Monitoring Systems

• Robotics & UGVs

• Temporary Wireless Networks

• Industrial and Environmental Monitoring

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FAQ

Q: What are the main and secondary antennas used for in a 1T2R UAV video data module?
A: This module adopts a 1T2R (1 Transmit, 2 Receive) architecture.

• Main antenna (Primary RF path):
  Responsible for both transmission (TX) and reception (RX).
  It is connected through a T/R (Transmit/Receive) switch, which routes the RF path either to the power amplifier during transmission or to the receiver chain during reception.
• Secondary antenna (Diversity receive path):
  Used only for reception (RX only).
  It improves link reliability by providing spatial diversity, helping mitigate:
  • Multipath fading
  • Signal blockage (e.g., drone body shadowing)
  • Orientation-dependent signal loss

Overall, the dual-receive design significantly improves link stability and robustness in mobile UAV scenarios.

Q: Can I modify the RF front-end by adding an up/down converter, PA, and LNA, and convert the system into a 1T1R architecture?
A: In theory, adding an external frequency conversion stage (up/down conversion) plus PA (Power Amplifier) and LNA (Low Noise Amplifier) can be implemented as part of a custom RF front-end. However, converting a 1T2R system into 1T1R is generally not recommended for UAV video links. Key impacts of switching to 1T1R:

• Reduced receiver sensitivity: Typically degraded by ~3–5 dB, due to the loss of spatial diversity gain.

• Lower link robustness in motion: UAV environments involve: Rapid movement / Orientation changes / Multipath fading, A single receive chain (1T1R) is more vulnerable to intermittent signal drops.

• Weaker anti-interference and fading resistance: Without dual receive antennas, the system loses diversity combining benefits.

Q: What is the maximum OFDM Peak-to-Average Power Ratio (PAPR) of this wireless video/data telemetry module?
A: The maximum OFDM PAPR of this module is typically: 11.5 dB. When designing an external RF front-end (such as PA, LNA, or frequency converter), sufficient PA back-off and linearity margin should be reserved to avoid signal distortion and spectrum degradation.

Q: Does Vcan2122 support video transmission?
Vcan2122 is a wireless data transmission module. Video transmission depends on external IP cameras or video encoders connected via Ethernet.

Q: Can this module support IP MESH MANET functionality?
No, default module is star networking type. If you need, we also can do IP MESH MANET (Mobile Ad Hoc Network) fucntion (use CX6702, CX6702 module). Currently, we provide it as a finished product rather than as a standalone development module. Please refer to the product image below for your reference. (CX6779-L4H2)

Q: Can multiple Vcan2122 systems operate in the same area?
Yes. Fixed-frequency operation allows multiple systems to coexist with minimal interference.

Q: Does one unit support multiple frequency bands?
No. Each Vcan2122 unit supports one single frequency band only.

Q: Is diversity reception supported?
Yes. The AUX antenna provides receive diversity to improve link reliability.

Q: What is the typical latency?
The typical end-to-end transmission delay is ≤20 ms.