COFDM Relay Repeater
适用于无人机无人机无线视频发射器和接收器的 COFDM 中继中继器模块 Vcan1870
目录
介绍
The module is a relay module, not a completed item. Customers need to add a power amplifier, filters, and receiving and transmitting antennas for it to work effectively. These need to be customized according to the two working frequencies selected by the customer.
To prevent interference, the drone employs a single frequency (例如. 400兆赫) for communication with the relay, and a different frequency (例如. 700兆赫) for communication between the relay module with the receiver. The separation between the two should be as large as possible.
特征
- Wireless Video COFDM Video Data demodulation and re-modulation
- 非视距和高速移动中信号稳定传输 (less than 600km/hour)
- 工作频率可调, 带宽, 发射功率, ETC (特别的 Parameter Configure Tool or UART STM32 LoRA )
- Lowest latency 200-300 毫秒
- Widely frequency range 200Mhz-3000Mhz
- 支持 AES256
- 带宽 1Mhz-8Mhz 可选的
- Video signal repeater for long-distance
介绍
规范:
IO
| 射频输入 | Two SMA females (to receive the signal) |
| 射频输出 | MMCX 女 (to send out the signal again) |
| control UART | 4PIN PH1.25mm 连接器 |
| 电源输入 | 2PIN PH2.54mm 凤凰连接器 |
| TF卡 | 用于固件更新 |
| 电源LED | red LED, constant light when the device is normally powered |
| 链接引导 | 绿色LED, 传输接收到的数据时闪烁 |
解调和调制
| 调制格式 | COFDM图传(DVB-T) |
| 运营商 | 2K |
| 带宽 | 可配置范围为 1MHz 至 8MHz, 步进1KHz |
| 前向纠错 | 1/2, 2/3, 3/4, 5/6, 7/8 |
| 保护间隔 | 1/32, 1/16, 1/8, 1/4 |
| 星座 | QPSK, 16QAM, 64QAM |
| 比特率 | 0.5Mbps 至 31.67Mbps |
射频接收
| 频段 | 160兆赫~860兆赫 (need an extra down converter block for 860-2300Mhz) |
| 调整步长 | 1千赫 |
| 灵敏度 | -97±1dBm(带宽=8MHz, QPSK, CR=2/3, 升糖指数=1/16) 对于一个通道，对于两通道增加 3dBm |
射频传输
| 频段 | 200兆赫~2300兆赫(其他频段可以通过特殊制造来支持) |
| 调整步长 | 1千赫 |
| 断电 | 可配置, 最大-5dBm(受频率影响) |
监测与控制
This COFDM relay repeater module can complete setup with our Parameter Configure Tool or STM32+LoRA (or other devices) via control uart. With our parameter configure too, the following parameters can be set:
– RX Received frequency (F1) 和带宽 (B1)
– TX Transmitted frequency (F2), 带宽 (B2), 前向纠错, 保护间隔, constellation, 和传输功率
温度范围
规格齐全: 0° 至 +70°C 环境温度
贮存: –40° 至 +80°C
电源要求
输入范围: 7～24VDC
功耗: <250毫安@12V
物理特性
外形尺寸: 73x51x15毫米
毛重: 32.4 克
串口 AT 命令
The AT commands mainly used in the COFDM Wireless Relay Repeater are ATDR, ATSD, ATG, ATSR, ATGR, and ATGB. For the introduction of specific commands, see the document.
常见问题解答
- Our COFDM Video Transceiver relay repeater supports 170-860Mhz. The COFDM transmitter also supports 2300Mhz, but the COFDM receiver only supports up to 860Mhz, 861-930Mhz receiver our COFDM-221 supports, over 930Mhz-2300Mhz needs to plus the frequency downconverter block to support.
- Our COFDM relay repeater module supports all the COFDM transmitters and receivers, the transmission distance depends on your external power amplifier and filter support.
眼下, adding a monitor is not feasible.
The current COFDM repeater design does not include any display output interface, and it also does not support video decoding functionality. The repeater works by directly receiving the COFDM data stream from the receiver module, changing the RF frequency, and retransmitting the data exactly as received.
This architecture is intentionally designed to achieve:
- The simplest and most reliable implementation
- 超低延迟
- Minimal processing delay
Since the unit does not decode the video stream internally, there is no video signal available for a local monitor display.
从技术上来说, yes — Ethernet output can be added.
然而, this would require additional software and hardware development, 包括:
- Data buffering and forwarding logic
- Network transmission program development
- 基于Web的配置界面
- IP address and port management functions
- System testing and optimization
Because of the extra development workload, this feature would typically require:
- A sufficient order quantity, 要么
- A separate NRE/development fee
If your project has volume demand or a dedicated budget for customization, we can evaluate this option further.
The COFDM repeater module itself does not include a built-in display or video output interface, so it cannot directly show tuning status or video images. This is because the repeater is designed as a transparent RF relay device that focuses on low latency and real-time frequency translation, without performing video decoding.
然而, the system can still be monitored and optimized in the following ways:
1. LCD Parameter Configuration Tool Board (受到推崇的)
The repeater can be connected to an external LCD parameter configuration tool board.
Through this tool, you can directly monitor key RF performance indicators such as:
- Received signal strength (接收信号强度指数)
- 信号质量 (信噪比)
- 误码率 (误码率)
- Link status and other RF parameters
These indicators are commonly used to determine whether the link is properly tuned and operating under optimal conditions.
2. Using an External Receiver for Video Monitoring (选修的)
If real video monitoring is required, you can connect a standard COFDM receiver near the repeater output side.
在这种情况下:
- The repeater still performs RF frequency translation only
- The receiver handles video decoding
- You can connect the receiver to a display or monitor to view the live video
This effectively allows you to check system performance visually if needed.
重要提示
The COFDM repeater itself:
- 做 not support video decoding
- 做 not output HDMI / CVBS / IP video signals
- Only performs transparent RF relay with frequency conversion
The below model is good for a two-way TDD bidirectional link of the Wireless relay transmitter and receiver or wireless transmitter and receiver relay repeater.
iVcan.com –
The Vcan1870 COFDM Relay Repeater module is an excellent addition to any UAV or drone wireless video transmission setup. Designed as a flexible relay, it reliably demodulates incoming COFDM signals and instantly re-modulates them for transmission, ensuring stable long-range video links. Its adjustable frequency, 带宽, and transmission power make it highly adaptable for different environments, while support for AES256 ensures secure communication. With low latency of 200–300ms and robust NLOS performance even at high speeds, this module is perfect for professional drone applications requiring reliable, high-quality video relay.