cofdm transmitter

COFDM-901T cofdm transmitter wireless video modulator uav transmission hdmi nols module receiver

Selling Points

HDMI DV input (Support Gopro camera)

Receiver 1: HDMI/TV out to screen monitor COFDM-221R

Receiver 2: USB to Mobile Phone, MID (Android) DVB-T2S

Receiver 3: WIFI Receiver to Mobile Phone, MID. (Android , Apple IOS)  WIFI-TV300

Receiver 4: 7 inch Portable HDMI Screen with DVB-T receiver, 7012HD

COFDM-901T test video http://v.youku.com/v_show/id_XMTg4OTQ0NzIyMA

Product Features

1. RF Transmission Power 200mW

(If you need 1W or 5W, please check CODM-902T.)

2.Extreme lightweight and rugged housing

3.Vibration and shock resistant

4.Applied COFDM modulation, MPEG-2 / H.264 compression

5.Small dimensions

6.Perfect for mobile applications

7.High quality of video transmission, no mosaic, no dragging phenomenon, stable power with adjustable dynamic power;

8.Support NLOS transmission, strong diffraction capability

Specification

Key Items: COFDM-901T

Video interface: HDMI input

PCB Size: 52mm X 40mm X 14mm

Weight: <20g

Video format: 720p@30fps, 1080p@30fps

ANT interface: flexible

RF Frequency : ISM900MHz band (902MHZ~928MHz)

RF power: 23dBm (adjustable)   

Min. input: -93dBm

Max. input: <-5dBm 

Bandwidth: 6MHz 7Mhz 8Mhz 

Channel Amount: 4 channels

Amount of users allowed No Limitation

Transmitted Distance: >2km

Time delay: ~200ms 

Supply: 5V@<1.5A

Working Temperture: –10℃~+50℃

 

 

 

 

Gallery

COFDM-901T Wireless HDMI Video Transmitter – Compact UAV COFDM Modulator with Multi-Receiver Compatibility

The COFDM-901T is a professional-grade wireless video transmitter designed for demanding UAV, mobile, and field-based applications. Leveraging advanced COFDM modulation and efficient MPEG-2 / H.264 compression, this compact module delivers stable, real-time video transmission even in non-line-of-sight (NLOS) environments. Whether you are flying a drone, conducting field surveillance, or managing mobile broadcasting, the COFDM-901T ensures reliable high-definition video feeds with ultra-low latency and superior anti-interference performance.

Unlike traditional analog video transmitters that suffer from mosaic, frame drops, and instability, the COFDM-901T provides crystal-clear digital video transmission with strong resistance to multipath fading and interference. With its lightweight design, rugged housing, and versatile receiver compatibility, this transmitter is perfectly suited for UAV operators, law enforcement agencies, security teams, and mobile broadcasters who demand performance, durability, and portability in one package.

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Key Selling Points

• HDMI DV Input – Supports HDMI input including direct connection to GoPro cameras and other HD video sources.

• Versatile Receiver Options:

  • Receiver 1 (COFDM-221R): HDMI/TV output for standard monitors.

  • Receiver 2 (DVB-T2S): USB connection for Android tablets, phones, and MID devices.

  • Receiver 3 (WIFI-TV300): Wireless WiFi receiver compatible with Android and iOS smartphones.

  • Receiver 4 (7012HD): 7-inch portable HDMI screen with built-in DVB-T receiver for instant field monitoring.

• Compact & Lightweight – PCB size of just 52mm x 40mm x 14mm and weighing under 20g, making it ideal for drones and mobile integration.

• Adjustable Transmission Power – 200mW RF output with dynamic adjustment for stable performance. For higher power requirements, users can upgrade to the COFDM-902T (1W / 5W output).

• Superior Anti-Interference Capability – Maintains clear, uninterrupted video transmission in urban, rural, and high-interference environments.

• NLOS Transmission Support – Strong diffraction capabilities allow video transmission even with obstacles or partial obstructions.

• Ultra-Stable Performance – No mosaic, no image dragging, and no frame drops even during rapid UAV movements.

• Low Latency Transmission – Typical delay of ~200ms, ensuring near real-time monitoring for drone piloting, surveillance, and mobile applications.

• Multi-User Support – No limitation on the number of receivers connected, enabling group monitoring and collaborative operations.

• Rugged & Reliable Design – Vibration and shock resistant, designed to withstand harsh UAV flight conditions and field operations.

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Product Features in Detail

1. Compact, Lightweight, and UAV-Friendly

The COFDM-901T is engineered with drones and mobile devices in mind. With dimensions of just 52mm x 40mm x 14mm and weighing less than 20 grams, it adds virtually no load to UAV payloads. This makes it an excellent solution for small drones that require high-quality video transmission without compromising flight time or agility.

2. Advanced COFDM Modulation

Conventional wireless transmitters struggle in multipath environments where signals reflect off buildings, vehicles, or terrain. The COFDM-901T overcomes this challenge by using COFDM (Coded Orthogonal Frequency Division Multiplexing) modulation, a robust technology known for its ability to maintain stable links in dynamic and interference-heavy environments. This ensures clear and reliable video feeds, even in urban canyons or complex environments.

3. High-Quality Video Transmission

Supporting both 720p at 30fps and 1080p at 30fps, the transmitter ensures crisp, detailed visuals. With built-in MPEG-2 and H.264 compression, the COFDM-901T balances video quality and bandwidth efficiency, enabling smooth streaming with minimal latency.

4. Multiple Receiver Options

Operators can select from a range of compatible receivers depending on application needs:

• HDMI/TV Output Receivers for traditional screen monitoring.

• USB Receivers for mobile devices such as Android tablets.

• WiFi Receivers for smartphone compatibility across Android and iOS platforms.

• Integrated Portable Monitors with built-in receivers for field deployment.
  This flexibility ensures that video feeds can be accessed by multiple users simultaneously without compatibility issues.

5. Non-Line-of-Sight (NLOS) Capability

One of the greatest challenges in wireless video transmission is maintaining a connection when obstacles block line-of-sight. Thanks to its strong diffraction and penetration capability, the COFDM-901T maintains stable video links even through buildings, foliage, or other obstructions. This feature is especially important for UAV surveillance in urban environments, rescue operations in dense terrain, and law enforcement activities where direct visibility cannot always be guaranteed.

6. Adjustable RF Power

The COFDM-901T offers 200mW RF output power, adjustable for different operational environments. Users seeking extended range or stronger penetration can explore the higher-power COFDM-902T model, which provides 1W and 5W transmission power options for long-distance missions.

7. Rugged and Durable Design

Built to withstand vibration, shock, and environmental stress, this transmitter is field-ready and UAV-tested. From fast-moving drones to ground vehicles, the COFDM-901T ensures uninterrupted performance under dynamic conditions.

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Technical Specifications

• Model: COFDM-901T

• Video Interface: HDMI input (supports GoPro and other HDMI cameras)

• Video Format: 720p @ 30fps, 1080p @ 30fps

• PCB Dimensions: 52mm x 40mm x 14mm

• Weight: <20g

• Modulation: COFDM

• Compression Standard: MPEG-2 / H.264

• RF Frequency: ISM 900MHz band (902MHz – 928MHz)

• RF Power Output: 23dBm (200mW, adjustable)

• Minimum Input Sensitivity: -93dBm

• Maximum Input: < -5dBm

• Bandwidth Options: 6MHz, 7MHz, 8MHz

• Channel Capacity: 4 channels

• Number of Users Supported: Unlimited

• Transmission Distance: >2km (depending on environment and receiver type)

• Latency: ~200ms

• Power Supply: 5V @ <1.5A

• Operating Temperature Range: -10℃ ~ +50℃

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Applications

The COFDM-901T is versatile and suitable for a wide range of professional applications:

1. UAV / Drone Video Transmission

   • Provides real-time HD video downlink for FPV piloting, aerial photography, surveillance, and inspection.

   • Low weight ensures minimal impact on drone flight time.

2. Law Enforcement & Public Security

   • Enables officers to monitor live video feeds during operations.

   • Ideal for covert surveillance and crowd monitoring in urban environments.

3. Military and Defense Applications

   • Rugged design ensures reliable performance in tactical deployments.

   • Supports real-time reconnaissance and situational awareness.

4. Emergency Response & Search and Rescue (SAR)

   • Transmits live drone footage to rescue teams in challenging terrain.

   • Helps coordinate efforts in disaster zones, forest searches, and flood monitoring.

5. Broadcasting & Live Events

   • Perfect for outdoor live broadcasting where stable video transmission is essential.

   • Can be integrated into mobile broadcasting vans or portable production systems.

6. Industrial Inspections

   • Used with drones to inspect power lines, oil rigs, bridges, and high-rise buildings.

   • Delivers stable HD video even in interference-heavy areas.

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Why Choose the COFDM-901T?

• Lightweight yet powerful – specifically designed for UAV payload integration.

• Stable and interference-resistant – COFDM ensures reliability where others fail.

• Flexible monitoring solutions – multiple receiver options for different use cases.

• Professional-grade performance – trusted by UAV operators, security forces, and broadcasters worldwide.

• Cost-effective upgrade path – start with 200mW output, expand to 1W/5W (COFDM-902T) when higher range is required.

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Conclusion

The COFDM-901T Wireless HDMI Video Transmitter is a compact yet powerful solution for real-time HD video transmission in UAV, mobile, and field applications. With its lightweight design, NLOS capability, multi-receiver compatibility, and proven COFDM modulation, it provides unmatched reliability and video quality in challenging environments. Whether you are an aerial photographer, drone operator, security professional, or broadcaster, the COFDM-901T is engineered to deliver the performance you need in the field.