In a typical cable transmission system, many manufacturers label their devices as "mixers," but in reality, these are often just distributors with a different label. The internal structure of these so-called mixers is essentially the same as that of a standard distributor. True mixers, on the other hand, are used when combining multiple signal sources in a cable TV system, typically handling more than 16 channels. It's rare to find a 2-to-8 channel mixer, and even the most basic professional mixer can cost thousands of dollars due to its complexity and performance requirements.
This distinction is important because it relates to how distributors are commonly used in one-way cable systems. As previously mentioned, distributors can transmit signals in both directions, but they have a fixed level of attenuation between the input (IN) port and the output (OUT) port. However, there is no fixed attenuation between two output ports, and the isolation between them is at least 25 dB, which helps reduce interference from adjacent channels.
Because of this characteristic, distributors are often used in reverse in practical applications. That means the OUT port is connected to the signal source, while the IN port is used as the output. For example, if transmitters 1 and 2 are connected to the two OUT ports, the IN port would be linked to a cable carrying the combined signal from both transmitters, allowing the receiver to get a clean, mixed signal without interference.
Understanding the difference between distributors and real mixers is crucial for setting up an efficient and reliable cable distribution system. While distributors may seem like a cost-effective alternative, they have limitations when it comes to handling complex signal combinations. Therefore, it’s essential to choose the right equipment based on the specific needs of the system.
By properly utilizing distributors and understanding their limitations, technicians can optimize signal quality and minimize unwanted interference. This knowledge is especially valuable in environments where multiple signals must be combined and distributed effectively across a network.
Source: http://news.chinawj.com.cn
Editor: Hardware Business Network Information Center
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