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2012Video Assist and Video Accessories forum

Comparing UHF and 2.4 GHz wireless video transmission for on-set use

14 years old. Gear and prices may have changed since.

What the thread found

  • UHF operates in the 400-900 MHz range while 2.4 GHz is much higher on the spectrum, making them unlikely to cause interference with each other.
  • The 2.4 GHz band is heavily saturated in the United States and on film sets, while UHF systems typically offer more available channels to switch between.
  • UHF signals require mostly line-of-sight transmission and perform better when antennas are positioned with minimal obstacles between them.
  • Lower frequencies like UHF can penetrate through physical objects better than higher frequencies like 2.4 GHz, which are more easily absorbed by walls, foliage, and atmospheric conditions.
  • Two 2.4 GHz devices operating on the same frequency can interfere with each other, potentially disrupting operation of both systems simultaneously.
  • Digital wireless systems using OFDM modulation with multiple antennas (MIMO) perform more reliably than analog FM systems at the same frequency bands.
  • Simple analog FM transmission systems at 5.8 GHz or 2.4 GHz are more susceptible to signal loss in crowded RF environments compared to digital systems.
  • A 2.4 GHz wireless follow focus system and a 2.4 GHz video transmitter may interfere when operating simultaneously if they occupy the same frequency channel.
  • Digital HD-SDI transmission at high frequencies is extremely sensitive to interference because signal loss results in complete loss of picture rather than degradation.

Depends on

  • The experience described with interference was anecdotal and limited to one specific incident; channel switching was not tested to confirm if another channel would have solved the problem.
  • The discussion conflates different frequency bands and transmission types without consistent technical specifications for all products mentioned.
  • One user's experience with an inexpensive 5.8 GHz system cannot be generalized to all 5.8 GHz products, which vary widely in design and implementation.
  • Environmental RF saturation varies by location and cannot be predicted without specialized testing equipment that operators typically do not carry.

Parts

Follow Focus

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