Wireless Links

HMW9 Micro COFDM Video Transmitter

HDMI and HD-SDI COFDM transmitter with low latency, 8mbps H264 codec

that runs on 900, 2400 and optional UHF or 5GHz bands for long range applications.


Using the COFDM transmission system, these units have outstanding range in both line of sight (LOS) and non-line of sight (NLOS). Operating at 500 milliwatts, the units are capable of 500 meters NLOS and 2KM+ LOS with ease. 


Unlike IP systems, DVB-T compliance allows for an unlimited number of receivers to be used. 


Flexible and convenient with battery plate or DC input. Embedded or external audio


Features: 


  • 3G video formats up to 1080p60
  • Available on 900, 2400 and 5000MHz bands
  • H.264 low delay encoding
  • Industry standard DVB-T modulation for high quality and interoperability with existing systems
  • Wide voltage input (7-18VDC)
  • Easy configuration via serial port or bluetooth
  • 1KHz tuning steps 
  • Cold shoe or 1/4-20 mount options
  • Exceptionally small size
  • Only 60 grams without battery


Camera Rentals are available with Wireless Video links, contact us today, 

Micro COFDM video transmitter for broadcast and drone applications on 900 or 2400MHz

Micro COFDM video transmitter for broadcast and drone applications on 900 or 2400MHz

Micro COFDM

COFDM video transmiter on canon C200 camera

Compact and easy to use

Frequently asked questions


What is the appropriate frequency for my application?

The lower the frequency, the better the range. For NLOS (Non Line of Sight) and long range applications, lower frequencies typically yield better results. Given the same power output, antenna gain, throughput and sensitivity, 900 MHz will travel significantly further than 5.8 GHz. For any given distance, the attenuation suffered by radios waves (Free space loss) increases with frequency. The higher the frequency, the more loss you encounter.

At any given distance, free space loss at 5.8 GHz is xx dB higher than at 2.4 MHz, and about xx dB higher than on 900 MHz. There are other factors as well, including Fresnel-zon eand noise/interference from other devices and the environment. 

What does this mean for me? 

If equal coverage is desired from 5.8 GHz and 900 MHz in identical conditions, the loss must be made up by a larger antenna.

Pros and cons of higher vs. lower frequencies:

As stated earlier, lower frequencies will reach farther given the same RX sensitivity and environmental variables. Higher frequencies, however, tend to be less crowded, while given the shorter wavelength of higher frequencies, antennas are smaller for the same gain. A simple unity gain antenna (an antenna that radiates a signal at the same gain as the input) for 5.8 GHz is much shorter than for 900 MHz, which means a high gain 8 dB omni or directional antenna will be significantly smaller in the higher frequency range. However, the range will be significantly less in a higher frequency. 

 When confronted with physical obstacles, the lower frequency will always perform better than the higher frequency. As mentioned above, the free space loss is significantly reduced in the lower frequency, so that lower frequencies can better penetrate an obstacle. Think of the old over the air television before cable. Broadcast at low frequencies, these signals could travel long distances through many obstacles to reach your home. 

To use another example, suppose your neighbour is having a late night party. You haven’t been invited, and are trying to get to sleep. The music is keeping you up. What part of the music is the problem? The bass - or the low frequency. It is able to penetrate the walls between your house and the neighbour. The lower the frequency, the better the range. 

What is channel width?

 Channel width refers to the occupied bandwidth of a radio transmission. A device operating on 2.412 GHz and using a 5 MHz channel means the center of the channel is on 2412 MHz and spreads 2.5 MHz in either direction. In this case, 2.4095 to 2.4145 GHz. 

How does this affect you? 

Given the same bit/Hz performance, a channel occupying 10 MHz instead of 5 will have double the throughput, which would allow for a better image. Keep in mind, however, most receivers sensitivity decreases as channel width increases, which might affect total performance. A receiver will be better able to understand signals coming from a transmitter with smaller channel width.

What channel width do they use?

For COFDM video transmitters we use 1/2/3/4/5/6/7/8 MHz channels

More info on DVB-T standard here