COFDM Relay Repeater
Модуль реле-ретранслятора COFDM для беспроводного видеопередатчика и приемника дрона БПЛА Vcan1870
Оглавление
Введение
The module is a relay module, not a completed item. Customers need to add a power amplifier, фильтры, 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 (например. 400Mhz) for communication with the relay, and a different frequency (например. 700Mhz) for communication between the relay module with the receiver. The separation between the two should be as large as possible.
Особенность
- Wireless Video COFDM Video Data demodulation and re-modulation
- Стабильная передача сигнала в условиях NLOS и высокоскоростного перемещения. (less than 600km/hour)
- Регулируемая рабочая частота, пропускная способность, мощность передачи, и т. д. (Особенный Parameter Configure Tool or UART STM32 LoRA )
- Lowest latency 200-300 миллисекунды
- Widely frequency range 200Mhz-3000Mhz
- Поддержка AES256
- Пропускная способность 1Mhz-8Mhz необязательный
- Video signal repeater for long-distance
Введение
Спецификация:
ИО
| RF input | Two SMA females (to receive the signal) |
| РЧ-выход | MMCX женщина (to send out the signal again) |
| control UART | 4PIN-разъем PH1,25 мм |
| Включение питания | 2PIN-разъем Phoenix PH2,54 мм |
| TF-карта | Для обновления прошивки |
| Светодиод питания | red LED, constant light when the device is normally powered |
| Ссылка привела | зеленый светодиод, мигает при передаче полученных данных |
Демодуляция и модуляция
| Форматы модуляции | COFDM(DVB-T) |
| Перевозчики | 2К |
| Пропускная способность | Настраивается от 1 МГц до 8 МГц, шаг на 1 кГц |
| FEC | 1/2, 2/3, 3/4, 5/6, 7/8 |
| Guard interval | 1/32, 1/16, 1/8, 1/4 |
| Созвездие | КФСК, 16QAM, 64QAM |
| Битрейт | 0.5Мбит/с до 31,67 Мбит/с |
RF получено
| Диапазоны частот | 160МГц~860МГц (need an extra down converter block for 860-2300Mhz) |
| Размер шага настройки | 1КГц |
| чувствительность | -97±1 дБм(Полоса пропускания=8 МГц, КФСК, CR=2/3, ГИ=1/16) для одного канала и добавьте 3 дБм для двухканального |
Радиочастотная передача
| Диапазоны частот | 200МГц~2300 МГц(другие диапазоны могут поддерживаться специальным производством) |
| Размер шага настройки | 1КГц |
| Выходная мощность | Настраиваемый, максимум -5 дБм(в зависимости от частоты) |
Мониторинг и контроль
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 (Ф1) и пропускная способность (Б1)
– TX Transmitted frequency (Ф2), пропускная способность (Б2), FEC, защитный интервал, созвездие, and transmission power
Диапазон температур
Полная спецификация: 0° до +70°C Окружающая среда
Хранилище: от –40° до +80°С
Требования к питанию
Диапазон ввода: 7~24 В постоянного тока
Потребляемая мощность: <250мА при 12 В
Физические характеристики
Габаритные размеры: 73х51х15мм
Вес брутто: 32.4 граммы
AT-команды UART
The AT commands mainly used in the COFDM Wireless Relay Repeater are АТДР, АТСР, АТГ, АТСР, АТГР, and ATGB. For the introduction of specific commands, see the document.
Часто задаваемые вопросы
- 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.
В данный момент, 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
- Сверхнизкая задержка
- Minimal processing delay
Since the unit does not decode the video stream internally, there is no video signal available for a local monitor display.
Technically, yes — Ethernet output can be added.
Однако, this would require additional software and hardware development, включая:
- 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, или
- 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.
Однако, the system can still be monitored and optimized in the following ways:
1. LCD Parameter Configuration Tool Board (Рекомендуется)
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 (РССИ)
- Качество сигнала (ОСШ)
- Частота битовых ошибок (БЕР)
- 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 (Необязательный)
If real video monitoring is required, you can connect a standard COFDM receiver near the repeater output side.
В этом случае:
- 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:
- Делает not support video decoding
- Делает not output HDMI / CVBS / IP video signals
- Only performs transparent RF relay with frequency conversion
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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, пропускная способность, 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.