COFDM Relay Repeater
Módulo repetidor de relé COFDM para transmisor y receptor de vídeo inalámbrico UAV drone Vcan1870
Tabla de contenido
Introducción
The module is a relay module, not a completed item. Customers need to add a power amplifier, filtros, 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 (p.ej. 400Megahercio) for communication with the relay, and a different frequency (p.ej. 700Megahercio) for communication between the relay module with the receiver. The separation between the two should be as large as possible.
Característica
- Wireless Video COFDM Video Data demodulation and re-modulation
- Transferencia de señal estable en NLOS y movimiento de alta velocidad (less than 600km/hour)
- Frecuencia de trabajo ajustable, ancho de banda, potencia de transmisión, etc. (Especial Parameter Configure Tool or UART STM32 LoRA )
- Lowest latency 200-300 milisegundos
- Widely frequency range 200Mhz-3000Mhz
- Apoyo AES256
- Ancho de banda 1Mhz-8Mhz Opcional
- Video signal repeater for long-distance
Introducción
Especificación:
OI
| entrada de radiofrecuencia | Two SMA females (to receive the signal) |
| salida de radiofrecuencia | MMCX hembra (to send out the signal again) |
| control UART | 4Conector PIN PH1.25mm |
| Poder en | 2Conector Phénix PIN PH2.54mm |
| tarjeta TF | Para actualización de firmware |
| LED de alimentación | red LED, constant light when the device is normally powered |
| enlace dirigido | LED verde, parpadea al transmitir los datos recibidos |
Demodulación y Modulación
| Formatos de modulación | COFDM(DVB-T) |
| Transportistas | 2K |
| Ancho de banda | Configurable de 1MHz a 8MHz, paso a 1KHz |
| FEC | 1/2, 2/3, 3/4, 5/6, 7/8 |
| Guard interval | 1/32, 1/16, 1/8, 1/4 |
| Constelación | QPSK, 16QAM, 64QAM |
| Tasas de bits | 0.5Mbps a 31,67 Mbps |
RF recibida
| Bandas de frecuencia | 160MHz~860MHz (need an extra down converter block for 860-2300Mhz) |
| Tamaño del paso de afinación | 1kilociclos |
| Sensibilidad | -97±1dBm(Ancho de banda = 8MHz, QPSK, CR=2/3, IG=1/16) para un canal y agregue 3dBm para dos canales |
Transmisión por radiofrecuencia
| Bandas de frecuencia | 200MHz~2300MHz(otras bandas pueden ser soportadas con fabricación especial) |
| Tamaño del paso de afinación | 1kilociclos |
| Apagado | Configurable, máximo -5dBm(sujeto a frecuencia) |
Seguimiento y control
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) y ancho de banda (B1)
– TX Transmitted frequency (F2), ancho de banda (B2), FEC, intervalo de guardia, constelación, y potencia de transmisión
Rango de temperatura
Especificaciones completas: 0° a +70°C Ambiente
Almacenamiento: –40° a +80°C
Requisitos de energía
Rango de entrada: 7~24 VCC
El consumo de energía: <250mA@12V
Características físicas
Dimensiones: 73x51x15mm
Peso bruto: 32.4 grams
UART AT commands
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.
Preguntas frecuentes
- 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.
En este momento, 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
- Latencia ultrabaja
- Minimal processing delay
Since the unit does not decode the video stream internally, there is no video signal available for a local monitor display.
Técnicamente, yes — Ethernet output can be added.
sin embargo, this would require additional software and hardware development, including:
- Data buffering and forwarding logic
- Network transmission program development
- Web-based configuration interface
- 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, o
- 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.
sin embargo, the system can still be monitored and optimized in the following ways:
1. LCD Parameter Configuration Tool Board (Recomendado)
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 (RSSI)
- Calidad de la señal (SNR)
- Tasa de error de bits (BER)
- 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 (Opcional)
If real video monitoring is required, you can connect a standard COFDM receiver near the repeater output side.
En este caso:
- 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.
Important Note
The COFDM repeater itself:
- Does not support video decoding
- Does 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, ancho de banda, 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.