Wireless Video Transmitter Receiver
COFDM Wireless Video Transmitter Receiver Transmission HDMI ?HD 1080P composite CVBS in H.264 COFDM-904T
Selling Points
0.5~1W RF output;
HD 1080P, SD 720P composite CVBS in
H.264/MPEG-2;
Delay <500 Millisecond;
How to change frequency at receiver, please check below video:
https://www.facebook.com/vcancn/videos/127856331093903/
Specification
| Product name | High-definition map transmission transmitter |
| Product number | COFDM-904T |
| Working frequency | 300MHz ~ 900MHz can be customized |
| Antenna interface | 50?? SMA male or MMCX female |
| Modulation mode | COFDM ??QPSK??16QAM??64QAM?? |
| Video bit rate | 2~10MHz |
| Working bandwidth | 6MHz??8MHz |
| Delay | 300 Millisecond |
| Compression format | H??264 |
| Image clarity | 1080P @60/50/30(backward compatible) |
| Operating Voltage | DC9 ~ 28V |
| Power consumption | ??8W @ standard power 500mW |
| weight | ??100g |
| Product Size | 80 * 65 * 20mm |
FAQ
| Question: Can you send me price list? |
| Answer: Yes, please send your email inquiry to us. |
| Question: Any chance to change to 2 or 5 Ghz band??? |
| Answer: Now our Transmitter frequency supports from 170~1500Mhz. |
| Question: COFDM-904T has HDMI input? |
| Answer: Yes, COFDM-904T has HDMI and CVBS input. It support Gopro camera. |
| Question: COFDM-904T is only 4 Channels? |
| Answer: COFDM-904T default has 4 frequency, if you need different or more, we will edit our software to do (170~900Mhz), Just send us your requirement details to us. |
| Question: What about data rate? Support 8M-10Mbps? |
| Answer: Default is 3M, we also can support 8-10Mbps if adjust parameter. |
| Question: Can I set manually by me? |
| Answer: It is better to pre-set in the factory and test passed before delivery. If need, we can also tell you the solution to change frequency. |
| Question: I need COFDM-904T work on 1080i 50 at least at 8-10Mbps |
| Answer: It is no problem. |
| Question: Can I set manually all the parameters by myself? |
| Answer: If you add PA (booster), then you can not; If you don’t need PA (booster), then you can?(PA is hardware, if you change setting, hardware should be adjustable) |
| Question: Which is the max frequency value we can set? |
| Answer: 900Mhz, Need higher, please choose COFDM-902T |
| Question: If the band range is 300-900 i will tell you exactly 4 ones in between to set for me, then i will need constant data rate at 10 Mbps, modulation at 16QAM, FEC at 1/2 and Guard Interval at 1/32. Encoding at 4.2.2 if possible instead of 4.2.0, 200 Meters (NLOS) Non Line Of Sight and 500 Meters (LOS) Line Of Sight. RF power at 500 mW, remember, data rate?MUST be fixed (not variable) at 10 Mbps, try this setting and let me know how it works (better if you can forward me a short video directly recorded from the HDMI output of the receiver – NOT SHOOTING A MONITOR SCREEN! At least we need 27dbm |
| Answer: OK, we can do the above sample if you confirmed. |
Do you have any question, please click here to ask a question.
Gallery
COFDM Wireless Video Transmitter & Receiver – COFDM-904T
The COFDM-904T Wireless Video Transmitter and Receiver is a high-performance, ultra-reliable solution for professional video transmission. Designed for applications demanding robust signal stability, minimal latency, and high-definition image quality, this system supports HDMI and composite CVBS inputs, delivering seamless video over long distances using advanced COFDM modulation technology. Whether you are working with UAVs, drones, remote broadcasting, security monitoring, or industrial video systems, the COFDM-904T provides a versatile and powerful transmission platform.
Key Features
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High-Definition Video Transmission
The COFDM-904T supports HD 1080P and SD 720P video input via HDMI or CVBS. Using H.264 or MPEG-2 compression, it ensures clear, crisp, and detailed video output. The device is backward-compatible with lower resolutions and frame rates, supporting 1080P at 60/50/30 fps, making it highly adaptable to different cameras and video sources. -
Advanced COFDM Modulation
Utilizing COFDM (Coded Orthogonal Frequency Division Multiplexing), the transmitter achieves superior anti-interference performance, making it ideal for both line-of-sight (LOS) and non-line-of-sight (NLOS) applications. Multiple modulation modes including QPSK, 16QAM, and 64QAM are supported to balance between transmission reliability and data rate. -
Low Latency Transmission
The system operates with an ultra-low delay, typically less than 500 milliseconds, making it perfect for real-time monitoring, drone piloting, and live broadcasting. The delay can be as low as 300 milliseconds in optimal configurations, providing almost instantaneous video feedback. -
Flexible RF Output
The transmitter comes with a 0.5–1W RF output, offering stable and long-range wireless performance. The working frequency range is 300 MHz to 900 MHz, which can be customized to meet regional regulations or project-specific requirements. SMA or MMCX antenna interfaces provide convenient connectivity options. -
Adjustable Data Rate & Bandwidth
With a video bit rate adjustable from 2 Mbps to 10 Mbps and a working bandwidth of 6–8 MHz, the COFDM-904T allows fine-tuning to achieve optimal video quality under different environmental conditions. Advanced users can request pre-set factory adjustments for specific needs such as fixed 10 Mbps data rate with 16QAM modulation and 1/2 FEC. -
Compact & Lightweight Design
Measuring just 80 × 65 × 20 mm and weighing around 100 grams, the COFDM-904T is easy to mount on drones, UAVs, or portable setups without adding unnecessary load. Its rugged housing ensures durability against vibrations and shocks, making it suitable for industrial and field applications. -
Wide Operating Voltage & Low Power Consumption
The device works across a broad DC 9–28V input, consuming less than 8W at standard 500 mW power, providing stable operation with minimal energy usage. This allows compatibility with most battery and vehicle power systems, supporting extended field deployment. -
Versatile Application
This system is widely used in:-
UAV and drone live video transmission
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Security and surveillance systems
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Industrial monitoring and remote inspection
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Live broadcasting and event coverage
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FPV drone racing and aerial cinematography
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How to Change Frequency
Changing the frequency on the COFDM-904T receiver is straightforward. For step-by-step guidance, please refer to this demonstration video:
How to Change Frequency
For advanced frequency settings, the factory can pre-configure the device to your exact specifications. Users can set up multiple channels within the 300–900 MHz range or request fixed data rate configurations for consistent performance.
Specifications
| Specification | Description |
|---|---|
| Product Name | High-Definition Map Transmission Transmitter |
| Model Number | COFDM-904T |
| Working Frequency | 300 MHz – 900 MHz (customizable) |
| Antenna Interface | 50 Ω SMA Male / MMCX Female |
| Modulation Mode | COFDM: QPSK / 16QAM / 64QAM |
| Video Bit Rate | 2 – 10 Mbps |
| Working Bandwidth | 6 – 8 MHz |
| Delay | 300 – 500 ms |
| Compression Format | H.264 / MPEG-2 |
| Image Clarity | 1080P @ 60/50/30 fps |
| Operating Voltage | DC 9–28V |
| Power Consumption | ≤ 8W @ 500 mW |
| Weight | ~100g |
| Product Size | 80 × 65 × 20 mm |
Frequently Asked Questions (FAQ)
Q1: Can I get a price list?
A: Yes. Please send your inquiry with your email, and we will provide the latest pricing and availability.
Q2: Can the transmitter work on 2.4 GHz or 5 GHz bands?
A: Currently, the transmitter supports 170–1500 MHz. Higher bands require a different model (e.g., COFDM-902T).
Q3: Does COFDM-904T support HDMI input?
A: Yes, it supports HDMI and CVBS input, compatible with GoPro cameras and other HD sources.
Q4: How many channels does the transmitter support?
A: The default configuration includes 4 frequencies, but additional channels or custom frequency ranges can be configured upon request.
Q5: What is the maximum data rate?
A: Default is 3 Mbps. It can support up to 10 Mbps depending on modulation, FEC, and bandwidth settings.
Q6: Can I manually adjust all parameters?
A: For standard operation, pre-setting at the factory is recommended. Manual adjustments are possible but may require software guidance, especially if a PA (power amplifier) booster is installed.
Q7: What is the maximum transmission distance?
A: Typical range is 200 meters NLOS and up to 500 meters LOS at 500 mW RF power. Performance may vary based on environmental conditions and obstacles.
Q8: Can I get a sample video from the receiver HDMI output?
A: Yes, upon request, we can provide a short video directly recorded from the HDMI output to demonstrate image quality.
Why Choose COFDM-904T?
The COFDM-904T stands out for its high-quality HD video transmission, ultra-low latency, customizable frequency options, and robust anti-interference design. Its small form factor, low power consumption, and compatibility with both HDMI and CVBS sources make it the perfect choice for UAV operators, professional videographers, and industrial applications.
With COFDM-904T, you get a reliable, easy-to-use, and versatile wireless video system capable of supporting a wide range of scenarios, from drone live streaming to secure industrial monitoring. Whether you need short-range NLOS performance or extended LOS transmission, COFDM-904T delivers professional-grade video quality and reliable connectivity.
Take your video transmission to the next level with COFDM-904T – the ultimate wireless HD solution for professional applications.
