2018-07

Video signal transmission generally uses direct modulation technology, in the form of baseband frequency (about 8MHz bandwidth), the common transmission medium is coaxial cable. Coaxial cable is specially designed to transmit video signals, its frequency loss, image distortion, image attenuation amplitude is relatively small, can be very good to complete the task of transmitting video signals. Generally, special SYV75 ohm series coaxial cables are used, and the commonly used model is SYV75-5 (its non-relay transmission distance for video signals is generally 300-500m); When the distance is relatively long, SYV75-7, SYV75-9 or even SYV75-12 coaxial cables are required (in actual engineering, the non-relay transmission distance of thick cables can reach more than 1km); There are also video amplifiers to enhance the brightness, chromaticity and synchronization signals of the video, however, the interference signal in the line will also be amplified, so too many video amplifiers cannot be connected in series in the loop, otherwise saturation will occur and image distortion will occur. The optical fiber transmission mode is adopted for farther distance. Optical fiber transmission has a series of advantages such as low attenuation, wide frequency band, no electromagnetic wave interference, light weight, good confidentiality, etc. It is mainly used for national, provincial and municipal backbone communication networks, cable TV networks and high-speed broadband computer networks. In the closed-circuit television monitoring system, optical fiber transmission has also become a long-distance video and audio and control signal transmission. Jiangsu Dicheng Cable Co., Ltd. is a professional Yangzhou cable manufacturer, specializing in the production and sales of wire and cable, video cable, monitoring cable, weak current cable, elevator cable, integrated wiring, security monitoring cable, elevator special monitoring cable, PVC insulated wire, flame retardant and fire resistant wire and cable, audio and telephone cable, video signal cable, LAN cable, etc. Contact telephone number: 0514-87531738.

2018-07-24

2018-07

Transportation and storage of wires and cables

The transportation and storage of wires and cables mainly have the following six points: 1. It is strictly prohibited to drop cables or cable trays with cables from high places during transportation, especially when the temperature is low (generally about 5 ℃ and below), throwing or falling cables may cause insulation and sheath cracking. Avoid storing cables in the open air in an exposed manner as much as possible, and the cable tray is not allowed to be laid flat. 3. When lifting packages, it is strictly forbidden to lift several plates at the same time. On vehicles, ships and other means of transport, the cable reel should be fixed with a suitable method to prevent mutual collision or overturning to prevent mechanical damage to the cable. The cable is strictly prohibited with acid, alkali and mineral oil contact, to be corrosive with these

2018-07-24

2018-07

How to choose the right wire and cable according to your needs

There are many types of wires and cables. When purchasing cables according to their own needs, they should generally pay attention to the selection of wire and cable models and specifications (conductor cross-section). 1. to consider the use, laying conditions and safety. For example: according to the different uses, can choose power cable, overhead insulated cable, control cable, etc.; according to the different laying conditions, can choose the general plastic insulated cable, steel tape armored cable, steel wire armored cable, anti-corrosion cable, etc.; according to the safety requirements, can choose non-flame retardant cable, flame retardant cable, halogen-free flame retardant cable, fire-resistant cable. 2. determine the use of wire and cable specifications (conductor section), the general should be considered.

2018-07-24

2018-07

Provisions for the installation of cables accompanying elevators

The cable tray and trunking cable for elevator accompanying cables shall meet the following requirements: (1) the cable tray shall be 2.2m above the ground, and the top of the tray shall not be less than 0.3m from the ceiling or other obstacles. The width of the bridge should not be less than 0.1m, and the filling rate of the cross section in the bridge should not exceed 50%. (2) cable tray cable vertical laying, at the upper end of the cable and every interval of 1.5m should be fixed on the bridge bracket; horizontal laying, in the cable head, tail, turn and every interval of 3~5m reinforcement. (3) The cable trunking shall be 2.2m above the ground. When set in the ceiling,

2018-07-24

2018-07

The advantages of integrated wiring system

Compatibility: in the traditional wiring system, telephone wiring using twisted pair, and computer wiring using coaxial cable, from the line material to the plug, socket are not the same; and in the integrated wiring system, all signal transmission are unified design, using the same transmission medium, plug, socket and adapter, so that the wiring system is greatly simplified. Openness: The design of the integrated wiring system conforms to the international unified standard, so it is open to all manufacturers' products. 3. Flexibility: Because in the integrated wiring system, all information is transmitted using the same transmission

2018-07-24

2018-07

The importance of integrated wiring

1, can make the system structure clear, easy to manage and maintain. 2. Due to the unified and advanced materials selected, it is conducive to future development needs. The system is flexible and can adapt to different needs. The integrated wiring system is easy to expand, while saving costs and improving system reliability. As an open system, integrated wiring is conducive to the integration of various systems. Jiangsu Dicheng Cable Co., Ltd. is a professional Yangzhou cable manufacturer, specializing in the production and sales of wires and cables, video cables, monitoring cables, weak current cables, elevator cables, integrated wiring, security monitoring cables, elevator special monitoring cables, PVC insulated cables

2018-07-24

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Jiangsu Dicheng Cable Co., Ltd.

Address: Shatou Pioneer Park, Yangzhou City, Jiangsu Province
Telephone:0514-87531738 87536528
Fax: 0514-87536508
E-mail:js@dcxl.net

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