The signal attenuation in a cable is directly proportional to its length. The longer the cable, the more significant the loss of signal strength. This phenomenon is governed by physical laws and is a fundamental characteristic of electrical transmission. Typically, cable lengths are measured in feet or meters. As audio and video signals travel through long cables, they experience degradation, which can manifest as a reduced signal-to-noise ratio, dimmer brightness, blurred images, or even synchronization issues. These effects are not only noticeable but also serve as key indicators for evaluating cable quality—specifically, how much signal is lost per unit length.
For example, different types of cables, such as general rubber-sheathed flexible cables, mining-specific rubber cables, shielded mine cables, waterproof flat rubber cables, welding cables, mining drill cables, and coal mining machine cables, are widely used in industries like mining, power, metallurgy, oil, fire protection, and chemical engineering. These products are manufactured by the Tianjin Cable General Factory's Rubber and Plastic Cable Factory and have been applied in numerous national-level infrastructure projects.
With 485 employees, including 13 senior engineers, 25 technical professionals, and 180 skilled workers, the factory spans 48,000 square meters with a construction area of 31,000 square meters. It has fixed assets worth 46 million yuan and an annual production capacity of 320 million yuan. The company is equipped with advanced machinery, high-quality manufacturing techniques, and comprehensive testing facilities. Its sales network covers over 20 provinces, supported by more than 80 service personnel. The factory has also strengthened its internal quality control systems, obtaining essential certifications such as the Mine Safety Sign Certificate, CCC certification, and ISO9001-2000 compliance, significantly enhancing product reliability and customer trust.
The factory specializes in producing a wide range of standard cables, including YC rubber cables, YH welding cables, JHS waterproof cables, SBH rubber cables, MY mining cables, VV/VLV copper and aluminum core PVC-insulated power cables, VV22/VLV22 armored power cables, BVR/RVV/RVVP/KVV/KVV22/KVVP cables, among others. With a commitment to “Quality First, Customer Foremost,†it has built a strong reputation since its establishment in 1972 as an affiliated enterprise of Tianjin Cable Plant and a member of Tianjin Kitty Cable Co., Ltd.
In addition to signal attenuation, other factors like capacitive reactance, electromagnetic interference, temperature, and impedance mismatch also affect signal integrity. Capacitive reactance determines the frequency range that a cable can effectively transmit. If image blurring occurs over a proper distance, it may indicate that the cable is not suitable for high-frequency transmission, leading to loss of detail in the image.
Electromagnetic interference (EMI) is another critical issue. Unshielded cables act as antennas, picking up unwanted signals that degrade the useful information being transmitted. This reduces the signal-to-noise ratio and impacts overall performance.
Temperature also plays a role in cable performance. Cables installed in areas with poor ventilation, such as walls or ceilings, may operate at higher temperatures, affecting their physical properties. Therefore, selecting cables with appropriate temperature ratings is crucial for reliable operation.
Impedance matching is vital in maintaining signal integrity. Mismatches can cause reflections, leading to standing waves and signal distortion. In video systems, this often results in a "ghosting" effect, where multiple images appear on the screen due to signal reflection.
Insertion loss, or signal attenuation, is another important parameter. It is usually expressed in decibels (dB) and varies with frequency and cable length. For instance, a cable might show -2.2 dB loss over 30 meters at 100 MHz. If the cable length doubles, the loss also doubles, reaching -4.4 dB at 60 meters.
Overall, the quality and performance of cables are essential in ensuring reliable and high-quality signal transmission across various applications. The Tianjin Cable Plant Rubber & Plastic Cable Factory continues to meet these demands with its extensive product range, rigorous quality standards, and strong market presence.
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