COFDM Relay Repeater
وحدة مكرر التتابع COFDM لجهاز إرسال واستقبال الفيديو اللاسلكي بدون طيار بدون طيار Vcan1870
جدول المحتويات
Introduction
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 (على سبيل المثال. 400ميجاهيرتز) for communication with the relay, and a different frequency (على سبيل المثال. 700ميجاهيرتز) for communication between the relay module with the receiver. The separation between the two should be as large as possible.
ميزة
- Wireless Video COFDM Video Data demodulation and re-modulation
- Stable signal transfer in NLOS and high-speed moving (less than 600km/hour)
- تردد العمل قابل للتعديل, عرض النطاق الترددي, قوة الإرسال, إلخ (خاص Parameter Configure Tool or UART STM32 LoRA )
- Lowest latency 200-300 ميلي ثانية
- Widely frequency range 200Mhz-3000Mhz
- الدعم AES256
- عرض النطاق 1Mhz-8Mhz اختياري
- Video signal repeater for long-distance
Introduction
تخصيص:
آيو
| مدخلات الترددات اللاسلكية | Two SMA females (to receive the signal) |
| إخراج الترددات اللاسلكية | أنثى MMCX (to send out the signal again) |
| control UART | 4دبوس PH1.25mm موصل |
| السلطة في | 2دبوس PH2.54mm موصل فينيكس |
| بطاقة TF | لتحديث البرامج الثابتة |
| أدى السلطة | red LED, constant light when the device is normally powered |
| أدى الرابط | الصمام الأخضر, يومض عند إرسال البيانات المستلمة |
إزالة التشكيل والتعديل
| صيغ التعديل | COFDM(DVB-T) |
| شركات النقل | 2ك |
| عرض النطاق | قابل للتكوين من 1 ميجا هرتز إلى 8 ميجا هرتز, خطوة بخطوة 1 كيلو هرتز |
| FEC | 1/2, 2/3, 3/4, 5/6, 7/8 |
| فترة الحراسة | 1/32, 1/16, 1/8, 1/4 |
| Constellation | QPSK, 16QAM, 64QAM |
| معدل البت | 0.5ميغابت في الثانية إلى 31.67 ميغابت في الثانية |
تم استلام الترددات اللاسلكية
| نطاقات التردد | 160ميجا هرتز ~ 860 ميجا هرتز (need an extra down converter block for 860-2300Mhz) |
| ضبط حجم الخطوة | 1كيلوهرتز |
| حساسية | -97± 1 ديسيبل(عرض النطاق الترددي = 8 ميجا هرتز, QPSK, س = 2/3, جي = 1/16) for one channel and add 3dBm for two-channel |
الترددات اللاسلكية المنقولة
| نطاقات التردد | 200ميجا هرتز ~ 2300 ميجا هرتز(ويمكن دعم النطاقات الأخرى بتصنيع خاص) |
| ضبط حجم الخطوة | 1كيلوهرتز |
| انقطاع التيار الكهربائي | شكلي, الحد الأقصى -5 ديسيبل(تخضع للتردد) |
المراقبة والتحكم
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) وعرض النطاق الترددي (ب1)
– TX Transmitted frequency (F2), عرض النطاق الترددي (B2), FEC, فاصل الحراسة, كوكبة, and transmission power
نطاق درجة الحرارة
المواصفات الكاملة: 0درجة إلى +70 درجة مئوية محيطة
تخزين: -40 درجة إلى +80 درجة مئوية
متطلبات الطاقة
نطاق الإدخال: 7~24VDC
استهلاك الطاقة: <250مللي أمبير @ 12 فولت
الخصائص البدنية
الأبعاد: 73×51x15 ملم
الوزن الإجمالي: 32.4 جرام
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.
الأسئلة الشائعة
- 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.
في اللحظة, 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
- الكمون المنخفض للغاية
- Minimal processing delay
Since the unit does not decode the video stream internally, there is no video signal available for a local monitor display.
من الناحية الفنية, yes — Ethernet output can be added.
لكن, this would require additional software and hardware development, مشتمل:
- 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, أو
- 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.
لكن, the system can still be monitored and optimized in the following ways:
1. LCD Parameter Configuration Tool Board (مُستَحسَن)
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 (آر إس إس آي)
- Signal quality (SNR)
- معدل خطأ البت (بير)
- 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 (خياري)
If real video monitoring is required, you can connect a standard COFDM receiver near the repeater output side.
في هذه الحالة:
- 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.
ملاحظة هامة
The COFDM repeater itself:
- يفعل not support video decoding
- يفعل 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, عرض النطاق الترددي, 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.