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
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