The Technical Specifications of Double Shielded Coax Cable Explained
The Technical Specifications of Double Shielded Coax Cable Explained: A Comprehensive Guide
In the realm of telecommunications and data transmission, coaxial cables have long been the backbone of reliable signal delivery. Among the various types, double shielded coaxial cable stands out for its exceptional performance and noise immunity. This article delves into the technical specifications of double shielded coax cable, empowering readers with a comprehensive understanding of its construction, characteristics, and applications.
Construction and Design
Double shielded coaxial cable, as its name suggests, employs two layers of shielding to safeguard the signal from external interference. The core conductor, typically made of copper, is surrounded by a dielectric layer, followed by the first shield, which is usually a braided mesh of copper or aluminum. The second shield, typically a foil or spiral wrap, is applied over the first shield, providing an additional layer of protection. The entire assembly is then encased in a durable outer jacket.
Signal Protection and Noise Immunity
The double shielding architecture of this cable offers exceptional signal protection and noise immunity. The braided mesh shield effectively blocks electromagnetic interference (EMI), while the foil or spiral wrap shield further attenuates high-frequency noise. This combination ensures that the signal transmitted through the cable remains intact and free from distortion, even in electrically noisy environments.
Electrical Characteristics
The electrical characteristics of double shielded coaxial cable are crucial in determining its performance and compatibility with various systems. Parameters such as characteristic impedance, capacitance, and attenuation play significant roles in signal transmission.
– Characteristic Impedance
Characteristic impedance is a fundamental property that defines the ratio of voltage to current in the cable. It is typically specified in ohms, and a 75-ohm characteristic impedance is commonly used for video and data applications.
– Capacitance
Capacitance, measured in picofarads per unit length, determines the amount of electrical charge stored in the cable’s dielectric. Higher capacitance can lead to signal distortion and attenuation.
– Attenuation
Attenuation refers to the loss of signal strength as it travels through the cable. It is expressed in decibels per unit length and is influenced by factors such as cable length, frequency, and construction.
Applications
Double shielded coaxial cable finds application in a wide range of industries and sectors, including:
– Video and Audio Distribution
Due to its exceptional noise immunity and signal integrity, double shielded coax is widely used in broadcast and video production, home entertainment systems, and surveillance cameras.
– Data Transmission
For high-speed data transmission in local area networks (LANs) and other structured cabling systems, double shielded coax provides reliable and low-latency signal delivery.
– Industrial Applications
In industrial settings, where electrical noise and interference are prevalent, double shielded coax is employed for control and monitoring systems, sensor interconnections, and automation devices.