The transmission distance of a wireless HDMI transmitter is not a fixed value and can be affected by various factors such as the device's hardware performance, usage environment conditions, and related technical parameters, as follows:

Core hardware performance of the device

Transmitting power and receiving sensitivity: Transmitting power directly determines the initial strength of the signal. The higher the power, the easier it is for the signal to overcome attenuation during propagation. The transmission distance is usually longer, but the transmitting power is limited by industry regulations and cannot be increased indefinitely. The higher the receiving sensitivity, the stronger the ability of the receiver to capture weak signals at long distances. Even if the signal propagates further and becomes weaker, it can still be received stably. Conversely, if the signal is not received, it is prone to signal interruption and shortens the effective transmission distance.

Antenna design and installation: The higher the antenna gain, the more concentrated the signal energy and the farther the transmission distance. For example, high gain directional antennas have a much longer transmission distance than ordinary whip antennas. At the same time, the installation height of the antenna is also crucial. The higher the installation position, the less likely it is to be obstructed by ground obstacles, and the smoother the signal propagation path, thereby extending the transmission distance; If it is close to the ground or obstructed by objects, signal loss will significantly increase.

Interference and occlusion in the usage environment

Physical obstacles: These are factors that have a significant impact on daily use. Walls, ceilings, especially load-bearing walls, as well as metal furniture, large appliances, etc., all absorb or reflect wireless HDMI signals. For example, after being separated by one or two walls, the transmission distance may be significantly reduced, and the obstruction of metal objects may even directly cause signal interruption. In an open and unobstructed living room, the signal transmission distance will approach the ideal value of the equipment.

Electromagnetic interference: Surrounding Wi Fi routers, Bluetooth devices, microwave ovens, etc. mostly share the 2.4GHz or 5GHz frequency band with wireless HDMI transmitters. These devices compete for frequency band resources and generate electromagnetic interference during operation. Running multiple wireless devices simultaneously in an office area can obstruct the signal transmission of the wireless HDMI transmitter, resulting in a much shorter actual transmission distance compared to a quiet home environment.

Equipment technology and protocol parameters

Working frequency band: Wireless HDMI transmitters commonly operate in the 2.4GHz and 5GHz frequency bands. The 2.4GHz frequency band has strong signal penetration and is suitable for scenes with minimal obstruction. The transmission distance is relatively long, but the transmission rate is average; The 5GHz frequency band has a high transmission rate and more stable image quality, but the signal attenuation is fast and the ability to penetrate obstacles is weak. In the same environment, the effective transmission distance is shorter than that of the 2.4GHz frequency band.

Modulation and coding methods: High order modulation methods can improve transmission rates, but require high signal quality and can easily shorten transmission distances; Although the low order modulation method has a slightly lower rate, it has strong anti-interference ability and can extend the transmission distance. In addition, devices equipped with forward error correction coding technology can compensate for some signal transmission losses and achieve longer transmission distances under the same conditions compared to devices without this technology.

Weather and environmental temperature and humidity

These factors have little impact on indoor short distance use, but are more pronounced in outdoor or long-distance transmission. High air humidity can enhance signal absorption, while "rain attenuation" on rainy days can exacerbate high-frequency signal attenuation, resulting in shorter transmission distances; Excessive or insufficient temperature can also affect the performance of transmitter components, causing power fluctuations and indirectly affecting the stability and effective distance of signal transmission.