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.

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:   

IO

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

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

RF

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

Performance
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: