HD Video Wireless Communication

Chinese  English


COFDM Wireless Downlink

COFDM Wireless Transmitter
COFDM Wireless Receiver

TDD Duplex Wireless Transceiver

  800M-1.4G IP Links 2W/5W
  800M-1.4G IP Links 10W
800M-1.4G-2.4G H265 Tx 300mW
  800M-1.4G-2.4G H265 Rx 300mW
5.8G H265 500mW


HDMI/AV Tx Module
SDI/AHD Tx Module
H265 Rx Module
H264 Rx Module
Relay Module
1W Power Amplifier

TDD OEM Modules

DLM Transceiver Module
DLB Transceiver Module
2W Power Amplifier(800M/1.4G)
5W Power Amplifier(800M/1.4G)
10W Power Amplifier(800M/1.4G)
H264/H265 Codec Modules
Video Encoder Enclosed
HDMI/AV Video Encoder
SDI/AHD Video Encoder
H.264 Video Decoder
H.265 Video Decoder


UART Config Panel

Sihid COFDM Wireless Downlink Transmitter

Sihid COFDM wireless digital video transmitter was designed for use with HD or SD cameras, it's a superior miniature wireless video transmitter designed to capture real-time, high-quality video from Point of View Cameras, UAV/UGV/Body Cams/Concealments, and sports cameras. The transmitter features HDMI or SDI or AV inputs with COFDM modulation technology and H.264/H.265 encoding that complete video audio transmission in high-speed motion and NLOS (non line of sight) conditions with low latency. Sihid COFDM wireless transmitter delivers up to 27dBm/30dBm/34dBm(different model) of power in a small metal case weighing less than 150 grams, providing long range, reliable HD video transmission.

  • COFDM modulation and H.264/H.265 video compression;
  • Full HD resolution, 1080i/P @60fps;
  • Great security by AES encryption;
  • Modular design and highly integrated;
  • Stable signal transfer in NLOS and high speed moving.
  • Adjustable working frequency, band width, bitstream rates, RF power, etc.

Now we have several models COFDM transmitter (in different RF power and video input interface with the same technology solution which lists below) ready to ship. We can also customize wireless COFDM transmitter according to your requirements based on our modules very quickly.

COFDM Transmitter Model ST100 ST200 ST210-HDMI ST210-SDI
Video input Mini HDMI or AV HDMI or AV + Ethernet HDMI or AV SDI or AV
Video encoder H.264 H.264 H.264/H.265 H.264/H.265
Maximum RF Power 500mW 1W/2.5W 1W/2.5W 1W/2.5W
Power consumption <1A@12V <1.3A/2.1A@12V <1.3A/2.1A@12V <1.3A/2.1A@12V
Weight 135g 140g 137g 139g
Dimensions 74x68x24.7mm 106x63.4x27mm 104.5x50x27mm 104.5x50x27mm

All of Sihid COFDM wireless transmitters are consist of three modules, H264/H.265 video encoder module, COFDM modulation module and power amplifier. All of Sihid COFDM transmitters use the same modulation module(Sihid RCB Module),the same H264 video encoder solution in different board model. All of the transmitters can be setup with Sihid Config Panel or Windows PC via control UART.

Sihid COFDM wireless transmitter Specification:   

HD Video input HDMI/SDI/Ethernet(Specify in different model)
Composite Video input NTSC or PAL
Data UART Up to 115200 baud Selectable
Control UART UART setup from Sihid Config Panel or PC or other device
Power in DC supply
RF output SMA

Modulation Formats COFDM(DVB-T)
Carriers 2K
Bandwidth Configurable from 1MHz to 8MHz, step by 1KHz
FEC 1/2, 2/3, 3/4, 5/6, 7/8
Guard interval 1/32, 1/16, 1/8, 1/4
Constellation QPSK, 16QAM, 64QAM
Bitrates 0.5Mbps to 31.67Mbps

Frequency Bands Specify: 300~360MHz, 350~400MHz, 450~500MHz, 520~560MHz, 580~620MHz, 680~720MHz, 820~860MHz, (customizable from 200~860MHz)
Tuning Step size 1KHz
Power out 27dBm, 30dBm, 34dBm(Specify in different model)

Video and Audio
Video input HDMI/SDI(Specify) or CVBS, auto-detected after system start-up
Video formats 1080@60P, 1080@50P, 1080@30P, 1080@25P, 1080@24P, 1080@60I, 1080@ 50I, 1080@30I, 720@60P, 720@50P, 720@30P, ……
720*480 60I(NTSC), 720*576 50I(PAL)
Video Coding H.264/H.265
Audio input Embedded HDMI/SDI or AV audio
Audio Coding AAC, 16bit, stereo, 32Kbps
Encryption AES256

Video latency: about 200ms, when Sihid COFDM transmitter is paired with the receiver, the video(1080p60) latency from its inputting of the transmitter to the HDMI screen displaying of the receiver is about 200~250ms.

Wireless transmission range: this is relative with many conditions, the following data is just for your reference. When 1W(RF power) Sihid COFDM transmitter paired with the receiver, 6MHz bandwidth, centre frequency 590MHz, 5 dBi omni antenna with 2 metres to the groud on both sides, the LOS(line of sight) transmission range is about 1km to 2km. When 1W(RF power) Sihid COFDM transmitter paired with the receiver, 6MHz bandwidth, centre frequency 590MHz, 1.5 dBi omni antenna on the UAV(flying height 100 metre), two 7 dBi omni antenna with about 2 metre to the ground, the LOS(line of sight) transmission range is about 10km to 20 km.  

Monitoring and control
Comprehensive transmitter setup with Sihid Config Panel or PC or other device via Control UART.

Temperature range
Full specification: 0° to +55°C Ambient

Power requirements
Input range: 11~13VDC

ST100 Transmitter:


ST200 Transmitter:

ST210-HDMI Transmitter:

ST210-SDI Transmitter:

Room 608, Dongbian Commerce Building, #222 Minzhi Road, Longhua District, Shenzhen, China 518131
Email: or, Phone:+86-755-23765232, Skype ID:embestzgr
Copyright©Sihid Technology Limited 2015-2021 all rights reserved.

矽海达提供基于FPGA COFDM调制技术的信道编码IP(DVB-T Modulator),无线宽带数据链路,COFDM高清数字无线图传解决方案,FPGA与嵌入式系统设计服务,FPGA OpenCL加速卡,AD9361/AD9363/AD80402/AD9364开发套件