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

COFDM Wireless Video Transmitter HDMI cvbs input

New COFDM Wireless Video Transmitter HDMI cvbs input mini modulator module long distance fpv uav

[box]High-definition digital wireless transmission transmitter COFDM-905T has built-in encoder board, RCA COFDM modulation module, small-size PA power amplifier module (changable 1W, 2W, 5W, 10W), the whole machine uses CNC aluminum alloy housing, small size, light weight, high transmission resolution, long distance, low latency.[/box]

Features

1. Supported audio and video input methods:
   1. Mini HDMI input (Digital)
   2. AV input (CVBS Analog, video, audio right, audio left)
2. Video input system support:
   1. Mini HDMI: 1080 60P, 1080 50P, 1080 30P, 1080 25P, 1080 60I, 1080 50I, 1080 30I, 720 60P, 720 50P, 720 30P, …, various modes of adaptation
   2. AV in: 720×480 60I (NTSC), 720×576 50I (PAL), mode adaptive
3. Video encoding: adopts H264 encoding technology and supports 1080P@60 at the maximum, backward compatible with other various resolutions and frame rate encoding.
4. The video encoding bit rate can be set through the serial port configuration, and the default adaptive air interface rate.
5. COFDM modulation
   1. Configurable Convolutional Code Ratio: 1/2, 2/3, 3/4, 5/6, 7/8
   2. Configurable modulation method: QPSK/QAM16/QAM64
   3. IFFT mode: 2K
   4. Configurable guard interval: 1/4,1/8,1/16,1/32
   5. Configurable wireless bandwidth: 1MHz~8MHz adjustable, 1KHz stepping
6. Output transmit power amplifier configurable
7. Working frequency band: 160MHz~860MHz can be configured;
8. Maximum transmission power: 1W or 2W;
9. Provide one-way transparent data transmission serial port;
10. Provides parameters for configuring the serial port and parameter configuration panel
11. AES-256 encryption transmission
12. Power supply: 10 ~ 13V, 12V best RF performance;
13. Power consumption: The power consumption of the whole unit is about 14W when the transmit power is 1W;
14. Overall size: 74 * 55 * 24.6mm
15. Weight: 135g

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 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

COFDM-905T Wireless Video Transmitter – Mini Modulator Module for Long-Distance FPV and UAV Applications

The COFDM-905T Wireless Video Transmitter represents the pinnacle of modern high-definition digital wireless transmission technology. Designed for professional FPV (First-Person View), UAV (Unmanned Aerial Vehicle), and aerial cinematography applications, this compact and lightweight transmitter integrates advanced COFDM modulation, H.264 encoding, and flexible input options to deliver smooth, long-range, low-latency video transmission in a variety of complex environments.

Key Overview and Advantages

The COFDM-905T combines a high-performance video encoder, an RCA COFDM modulation module, and a small but efficient PA power amplifier into a single, compact unit. The transmitter is housed in a precision CNC aluminum alloy casing, providing durability, lightweight portability, and effective heat dissipation. Users benefit from a robust wireless video link with high transmission resolution, long-distance coverage, and minimal latency, making it ideal for UAV-based video monitoring, professional aerial photography, drone racing, and other high-demand remote video applications.

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Video and Audio Input Capabilities

This transmitter supports multiple input methods, providing flexibility for various video sources:

• Mini HDMI Input (Digital): Fully supports high-definition digital video sources including 1080p60, 1080p50, 1080p30, 1080p25, 1080i60, 1080i50, 720p60, 720p50, 720p30, and more. The HDMI input is compatible with cameras, action cameras, and other professional imaging devices.

• AV Input (CVBS Analog): Includes support for standard analog video input with stereo audio (right/left channels). Video input formats include NTSC 720×480 60I and PAL 720×576 50I, with adaptive mode support for legacy devices.

The transmitter employs H.264 video encoding technology, supporting up to 1080p60 video while remaining backward compatible with lower resolutions and frame rates. The video encoding bit rate can be adjusted via the serial port configuration or left on default adaptive mode, ensuring optimal performance for different transmission distances and environments.

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Advanced COFDM Modulation Features

The COFDM-905T leverages advanced COFDM (Coded Orthogonal Frequency Division Multiplexing) technology, ensuring robust and stable video transmission even in environments with interference or obstacles. Key configurable features include:

• Convolutional Code Ratios: 1/2, 2/3, 3/4, 5/6, 7/8 – allowing users to balance redundancy and efficiency according to signal requirements.

• Modulation Methods: QPSK, QAM16, QAM64 for varying levels of signal robustness and spectral efficiency.

• IFFT Mode: 2K, providing excellent multipath resistance for challenging environments.

• Guard Intervals: Configurable 1/4, 1/8, 1/16, 1/32, improving interference immunity and reliability.

• Wireless Bandwidth: Adjustable from 1 MHz to 8 MHz in 1 kHz steps, offering precise control over spectral utilization and link performance.

This level of configurability allows professional users to optimize the transmission link for distance, terrain, and environmental interference.

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Transmission Power and Frequency

The COFDM-905T offers a flexible power amplifier module, with selectable output options of 1W, 2W, 5W, or 10W (depending on specific user requirements). This flexibility enables operators to tailor the transmitter’s performance for specific use cases, from short-range FPV to long-range UAV video transmission.

• Working Frequency Band: Fully configurable from 160 MHz to 860 MHz.

• Maximum Transmission Power: Up to 10W (configurable).

• AES-256 Encryption: Ensures secure and private video transmission over wireless networks.

• Serial Data Transmission: One-way transparent serial port allows for telemetry and remote control data transmission alongside video.

Power Supply and Efficiency

• Operating Voltage: 10–13V DC (optimal 12V for best RF performance).

• Power Consumption: Approximately 14W when operating at 1W transmission power.

The transmitter’s efficient design ensures minimal heat generation while maintaining high-quality signal output, allowing for long operational periods during demanding aerial missions.

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Performance in Real-World Applications

When paired with a COFDM-905R receiver, the COFDM-905T achieves low-latency video transmission, critical for FPV and UAV operations. Video delay is influenced by video encoding rate, air interface rate, and transmission settings. Actual tests show:

• 720p60: ~60 ms video delay

• 1080p60: ~130 ms video delay

Default operational delay is set to ~200 ms to ensure smooth video under most conditions, accounting for camera input delays.

Transmission Range:

The COFDM-905T supports long-distance video links, with actual performance depending on environmental factors including interference, obstacles, humidity, and antenna setup. Sample tests include:

• UAV-mounted ST100 transmitter at 100 meters altitude, 1W power, 700 MHz center frequency, 4 MHz QPSK bandwidth, with a 3dBi antenna at the transmitter and 10dBi dual-polarized fiber antenna at the receiver, achieved 16 km smooth video transmission.

• Urban road test in Shenzhen using 340 MHz, QPSK 8 MHz bandwidth, ordinary 3dBi transmitter antenna, fiberglass receiver antenna with Yagi configuration at 2.2 meters high achieved 2.2 km high-definition video transmission, overcoming visual obstacles like buildings.

These results demonstrate the transmitter’s robust performance across both open and obstructed line-of-sight conditions.

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Physical Specifications

• Dimensions: 74 × 55 × 24.6 mm

• Weight: 135 g

• Construction: CNC aluminum alloy for lightweight, rugged, and durable housing.

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Connector Options

The COFDM-905T offers multiple connectivity options to accommodate various devices:

• HDMI input for digital cameras

• CVBS/AV analog input for older devices

• Power and serial port connections for configuration and data transmission

These connectivity options make the COFDM-905T compatible with nearly any video source, from modern high-definition cameras to legacy analog devices.

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Applications

The COFDM-905T is ideally suited for:

• FPV UAV systems for real-time aerial monitoring and video streaming.

• Professional aerial cinematography, capturing smooth, high-quality HD video from drones.

• Emergency response and public safety, including search and rescue operations requiring long-range, low-latency video links.

• Industrial monitoring, infrastructure inspection, and any application requiring reliable wireless video in challenging environments.

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Summary

The COFDM-905T Wireless Video Transmitter is a professional-grade, miniaturized transmitter module combining high-resolution video support, advanced COFDM modulation, long-range capability, low latency, and versatile connectivity options. Its lightweight, durable design and configurable power, frequency, and modulation parameters make it the ideal choice for UAV, FPV, and other high-demand wireless video transmission applications. Whether for commercial, industrial, or recreational purposes, the COFDM-905T delivers unmatched performance, reliability, and video quality.

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Specifications at a Glance

• Video Input: HDMI 1080p/720p, CVBS NTSC/PAL

• Encoding: H.264, adjustable bit rate

• Modulation: COFDM, QPSK/QAM16/QAM64

• Transmission Power: 1W/2W/5W/10W configurable

• Frequency: 160–860 MHz

• AES-256 encryption

• Power Supply: 10–13V DC

• Dimensions: 74 × 55 × 24.6 mm

• Weight: 135g

• Latency: ~60 ms (720p60) / ~130 ms (1080p60)

• Max Transmission Distance: Up to 16 km (LOS, test conditions)