COFDM Wireless Video Receiver HDMI cvbs input mini modulator module RX long distance fpv uav

COFDM Wireless Video Receiver HDMI CVBS output

COFDM Wireless Video Receiver HDMI CVBS output mini modulator module long distance fpv UAV Data Transmission UART config Recorder

Work for COFDM-905T

 

HD digital wireless video transmission receiver COFDM-905R
Built-in Decoder board and COFDM dual-antenna receiving demodulation module, the whole machine adopts aluminum alloy casing, high receiving sensitivity, low decoding display delay, high-definition video output stable and clear.

Features

1. Dual Antenna reception
2. Support working frequency range: 160MHz~860MHz, the center working frequency can be configured;
3. Wireless bandwidth is configurable;
4. The sensitivity of dual antenna reception -100±1dbm (QPSK 8MHz);
5. Wireless receiving status information (such as received signal strength, air interface rate, data rate, working frequency, wireless bandwidth, etc.) can be superimposed/not displayed on the video screen through the OSD switch button, or output to the serial port (customized) ;
6. Low-latency H264 video decoding, support 1080P@60 decoding playback;
7. Audio and video output (HDMI, CVBS, USB port simultaneous output):
   1. HDMI Type A port audio and video output
   2. CVBS (Lotus Head) AV audio and video output
   3. Output video stream to the phone/tablet decoding display via USB port
8. Support video receiving and decrypting function (matching with video encryption at the transmitting end);
9. Support TF card or USB disk video recording;
10. Provide one-way single-direction transparent data transmission serial port;
11. Provide parameters to configure the serial port for working settings (such as center working frequency, wireless bandwidth, receiving decryption password);
12. Power supply: 6~15V, working power consumption is 230mA@12V.
13. Machine size: 115x90x34mm
14. Machine weight: 243 grams

Connector:

1. ANT-in: wireless signal input antenna interface, SMA external threaded inner hole
2. HDMI: A type HDMI carrier, high-definition audio and video output interface
3. CVBS: analog video output interface
4. AL/AR: left and right channel analog audio output
5. Power connector: 3PIN 2.54mm socket
6. USB interface:
   1. External phone or tablet can be used to output audio and video to mobile phone or tablet for decoding display
   2. Recording video can be connected to an external USB flash drive or USB hard disk
7. OSD button:
   The receiving status information displays the on/off button, and the long press button can switch the switch status, and the switch status will be powered off. When the reception status information display is turned on, it is displayed in red in the upper left corner of the output video screen:
   1. RF：338.0MHz BW：4.0MHz
      QPSK CR：2/3 GI：1/16
      AIR：3.90Mbps
      VBR：3.05Mbps AES OFF
      SIG1：27 SIG2：22
      ber1：0.14% ber2：100.00%
      REC OFF No Storage
   2. RF indicates the center operating frequency, and BW indicates the working bandwidth.
      QPSK is the modulation mode, CR is the convolutional code rate, and GI is the guard interval.
      AIR is the air interface rate
      VBR is the video bitrate, AES OFF means no encryption
      SIG1 refers to the received signal strength near the HDMI port antenna, and SIG2 refers to the other antenna.
      Ber1 refers to the BER error rate near the HDMI port antenna, and ber2 refers to another antenna.
      REC OFF means no video storage
8. When the wireless receiving signal is interrupted or weak, the output video screen will be interrupted (the re-received signal screen will be automatically restored), and display: Disconnected, no signal
9. REC button: Video recording on/off button, short press button to switch state, start recording after power is detected. The system defaults to recording to the TF card. If the TF card is not inserted, it is recorded to the USB flash drive. If they are not inserted, they will not be recorded.
10. Link indicator: The wireless receiving link working status indicator lights up after the system is started and blinks when the receiving signal is normal.
11. REC indicator: The video recording indicator will flash at the low frequency when recording video, otherwise the high frequency will flash.
12. PWR indicator: Power Indicator.
13. CFG serial port: Parameter configuration Serial port, you can configure wireless receiving related parameters, such as center working frequency, wireless bandwidth, decryption password, etc. Vcan provides a matching parameter configuration panel SconB to facilitate user parameter setting.
14. Data serial port: Transparent data transmission serial port. The serial port data of the transmitter can be wirelessly transmitted to the receiver and output from the serial port.
15. TF card interface: Used for software upgrade maintenance or for storing video.

Note

When the COFDM-905T transmitter and COFDM-905T receiver form a point-to-point wireless video transmission system, the video delay indicator:
The three indicators of video delay, video bit rate, and air interface rate are the mutual influence and mutual restraint. When the air interface rate is greater than 5 times the video code rate, the video delay is minimum. In this case, the actual test is that the video delay is about 60 ms when the code is transmitted at 720P@60, and the video delay is about 130 ms at 1080P@60. The delay refers to the delay from the HDMI video input at the transmitting end to the HDMI video output at the receiving end, excluding the delay of the front-end camera of the transmitting end (we measured the delay of a brand SLR camera at about 70 ms, and the delay of a famous brand sports camera at about 130 ms). For most application scenarios, the video delay is set to about 200ms by default.

When the COFDM-905T transmitter and the COFDM-905R receiver form a point-to-point wireless video transmission system, the transmission distance is:
The wireless transmission distance is related to many factors such as the test environment, ambient electromagnetic interference, occlusion conditions, air humidity, working frequency, wireless bandwidth, and transmitting and receiving antennas. Actual test results: a customer test, unmanned aircraft mounted ST100 transmitter to fly about 100 meters high, set to 4M QPSK wireless bandwidth, 700MHz center operating frequency, 1W transmit power, transmitter antenna 3dBi around, Receiving double glass fiber antenna gain of about 10dBi, distance of up to 16km (video smooth); our own road test in Shenzhen, the launch end on the flyover, ordinary hose antenna (about 3dBi gain), 340MHz launch, QPSK 8M Bandwidth, a fiberglass antenna at the receiving end, and a Yagi antenna, about 2.2 meters high on the pole, 2.2 kilometers away, high-definition video smooth, a small amount of high-rise buildings between the transmitter and receiver, the road visually about 20 degrees bending. Due to conditional restrictions, no further road tests were made.

Connector

Size

75 x 55 x 25 mm

RF Performance Test

Operating Center Frequency 470MHz, Power Amplifier: 1W

Operating Center Frequency 700MHz, Power Amplifier: 1W

Upgrade

How to upgrade TX from 720P to 1080P?

COFDM Wireless Video Receiver – HDMI & CVBS Output

Long-Range Wireless HD Video Receiving System for UAV, FPV, and Professional Applications

The COFDM Wireless Video Receiver (Model COFDM-905R) is a professional-grade wireless receiving module designed to deliver stable, low-latency, high-definition video and audio output in demanding environments. This advanced receiver is optimized to work seamlessly with the COFDM-905T wireless transmitter, forming a powerful point-to-point or point-to-multipoint video transmission system. Engineered with precision for industries such as aerospace, unmanned aerial vehicles (UAV/FPV), military reconnaissance, public safety, broadcasting, and industrial monitoring, the receiver provides users with a robust, flexible, and reliable wireless video downlink solution.

Housed in a durable aluminum alloy casing, the COFDM-905R integrates a dual-antenna diversity demodulation module and a built-in H.264 decoder board. This ensures exceptional reception sensitivity, minimized error rates, and superior video decoding performance. With HDMI and CVBS output options, along with USB support for recording and mobile device display, the receiver is designed for maximum compatibility and ease of use.

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Key Highlights

• Dual-antenna diversity reception with outstanding sensitivity (-100±1dBm @ QPSK 8MHz)

• Configurable working frequency: 160MHz–860MHz, adjustable to meet specific applications

• Configurable bandwidth: optimized for narrowband and broadband transmission scenarios

• Low-latency H.264 video decoding, supporting up to 1080p@60fps real-time playback

• Multiple output interfaces: HDMI Type-A, CVBS (RCA), analog stereo audio, and USB

• Recording support via TF card or USB flash drive/hard disk

• Transparent data transmission via UART serial port for telemetry or control signals

• On-screen display (OSD) of reception parameters or serial port output for diagnostics

• Compact and lightweight: 115 × 90 × 34 mm, only 243 g, ideal for UAV and field applications

• Wide power input range: 6–15V DC, low consumption at 230mA @12V

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Advanced Features in Detail

1. High-Sensitivity Dual Antenna Reception

The COFDM-905R utilizes dual-antenna diversity reception technology, which dynamically selects the stronger signal path to ensure smooth, uninterrupted video. This significantly reduces the risk of video dropout or frame loss, even in environments with high interference, multipath fading, or partial obstructions. The sensitivity level of -100±1dBm guarantees reliable reception over long distances.

2. Flexible Frequency & Bandwidth Configuration

The system supports a broad frequency range from 160MHz to 860MHz, making it adaptable to various regulatory environments and mission requirements. Users can configure the center frequency and wireless bandwidth (e.g., 2MHz, 4MHz, 8MHz) via the CFG serial port or the included configuration panel. This flexibility allows operators to balance transmission distance, data throughput, and interference avoidance.

3. Low-Latency HD Video Decoding

Featuring an integrated H.264 hardware decoder, the COFDM-905R can handle 1080P@60fps high-definition video streams with minimal delay. When paired with the COFDM-905T transmitter, the system achieves an end-to-end video delay as low as 60ms at 720P@60, and around 130ms at 1080P@60 under optimized conditions. This makes the receiver ideal for real-time applications such as UAV piloting, live broadcasting, and tactical surveillance.

4. Versatile Audio/Video Outputs

• HDMI Output (Type-A): Delivers uncompressed digital video and audio for professional monitoring equipment.

• CVBS Output (RCA): Provides analog video and audio output for compatibility with legacy systems.

• USB Output: Streams video directly to a smartphone, tablet, or PC for portable display and analysis.

This multi-interface design ensures seamless integration into a wide variety of setups.

5. Data Transmission and Configuration

Beyond video, the receiver provides a transparent UART data port that can transmit telemetry, command, or sensor data alongside the video stream. A separate CFG serial port allows configuration of operating parameters, including:

• Center frequency

• Wireless bandwidth

• Decryption password (for encrypted transmission)

This makes the COFDM-905R not just a video receiver, but also a versatile wireless data terminal.

6. Recording and Storage

The receiver supports TF cards, USB flash drives, or external USB hard disks for local video recording. The built-in recording management system automatically prioritizes TF cards, followed by USB storage. This function ensures that mission-critical footage can be securely logged and reviewed later.

7. On-Screen Display (OSD) Diagnostics

With the integrated OSD button, users can choose to display or hide real-time system parameters over the video output. Displayed information includes:

• Frequency and bandwidth

• Modulation scheme (e.g., QPSK)

• Coding rate and guard interval

• Signal strength per antenna (SIG1, SIG2)

• Bit error rates (BER1, BER2)

• Air interface rate and video bitrate

• Encryption status

• Recording status

This diagnostic overlay is invaluable for field technicians and UAV operators, providing immediate insight into system performance without the need for external tools.

8. Indicators and User Controls

• Link Indicator: Shows wireless link status (steady when connected, blinking when active).

• REC Indicator: Flashes when recording is active.

• PWR Indicator: Confirms system power.

• REC Button: One-touch start/stop recording.

• OSD Button: Toggle display of system information.

These intuitive indicators and controls simplify operation in high-pressure field environments.

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Performance and Real-World Applications

The COFDM-905R excels in both line-of-sight (LOS) and non-line-of-sight (NLOS) scenarios. Its strong anti-multipath capability allows it to maintain stable reception in urban environments, through foliage, or in mountainous terrain.

Transmission Distance Examples:

• Customer UAV Test: At 700MHz, QPSK 4MHz bandwidth, 1W transmit power, and 100m altitude, the system achieved 16 km of stable, smooth video transmission using dual 10dBi fiberglass antennas at the receiver.

• Road Test in Shenzhen: With 340MHz center frequency, 8MHz bandwidth, 1W transmitter power, and a simple 3dBi antenna at the transmitter, the system maintained clear video at 2.2 km, despite obstructions and multipath conditions.

These results demonstrate that actual performance depends on antenna selection, environment, frequency, and bandwidth settings, but the COFDM-905R consistently delivers long-range, stable results.

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Technical Specifications

Frequency Range: 160–860 MHz
Bandwidth: Configurable (2/4/8 MHz)
Sensitivity: -100 ±1 dBm (QPSK, 8MHz)
Video Decoding: H.264, up to 1080P@60fps
Audio/Video Outputs: HDMI, CVBS, Stereo Audio, USB
Recording: TF card, USB flash drive, USB HDD
Serial Ports: Transparent data port + CFG port
Power Supply: 6–15V DC
Consumption: 230 mA @ 12V
Dimensions: 115 × 90 × 34 mm
Weight: 243 g
Enclosure: Aluminum alloy housing
Connectors: SMA (ANT-IN), HDMI Type-A, RCA CVBS, 3-pin Power, USB

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Typical Applications

• UAV / Drone Video Downlink: Real-time aerial monitoring for mapping, inspection, and surveillance

• Public Safety: Police, firefighting, and emergency response video links

• Broadcasting: Wireless camera backhaul for sports, news, and event coverage

• Industrial Monitoring: Pipeline inspection, mining, and offshore operations

• Military & Security: Reconnaissance, border patrol, and tactical command video feeds

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Conclusion

The COFDM-905R Wireless Video Receiver is a high-performance solution engineered for professionals who demand reliable, long-range, and low-latency video reception. With its robust dual-antenna design, configurable operating parameters, versatile output options, and advanced diagnostic tools, it stands as an ideal receiver for UAV operators, system integrators, and security professionals alike.

By combining cutting-edge COFDM modulation technology with practical field-oriented features, the COFDM-905R ensures stable video performance in real-world conditions—whether in open skies, dense cities, or challenging tactical environments.