Coaxial Cables
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Coaxial Cable Specification Table:
|
Parameter |
Details |
|
Conductor Material |
Copper (solid or stranded), copper-clad steel (CCS) |
|
Dielectric Insulation |
Polyethylene (PE), foam polyethylene, or PTFE (Teflon) |
|
Outer Conductor (Shielding) |
Braided copper, aluminum, or foil |
|
Outer Jacket Material |
PVC (Polyvinyl Chloride), PE (Polyethylene), or LSZH (Low Smoke Zero Halogen) |
|
Impedance |
50 ohms (for data transmission, radio) or 75 ohms (for TV, cable, CCTV) |
|
Frequency Range |
Typically from 1 MHz to several GHz depending on cable type |
|
Attenuation |
Varies by frequency and cable type; usually measured in dB per 100 feet |
|
Voltage Rating |
Typically between 300V and 500V, depending on the application |
|
Shielding Effectiveness |
60% to 95% coverage, depending on the shield type and application |
|
Temperature Rating |
-20°C to 80°C (varies based on jacket material) |
|
Standards Compliance |
Meets international standards such as RG (Radio Guide) or MIL-C-17 for military applications |
Common Coaxial Cable Types and Applications:
|
Cable Type |
Impedance |
Application |
|
RG-6 |
75 ohms |
Used for cable TV, satellite TV, CCTV |
|
RG-59 |
75 ohms |
Used for short-distance video transmission, CCTV |
|
RG-11 |
75 ohms |
Used for long-distance cable TV or internet |
|
RG-58 |
50 ohms |
Used for data, RF transmission, amateur radio |
|
RG-213 |
50 ohms |
Used for high-power signal transmission, military |
|
LMR-400 |
50 ohms |
Used for wireless communication, antenna systems |
Key Features:
- Conductor:The central conductor is usually made of copper for excellent signal transmission, though copper-clad steel (CCS) is used for higher strength and durability in certain applications.
- Dielectric Insulation:This layer surrounds the conductor and provides electrical insulation. Foam polyethylene or solid PE is common for flexibility and low attenuation.
- Shielding:Coaxial cables have a braided shield or foil shield to block electromagnetic interference (EMI). Higher shielding percentages (e.g., 95%) are used in high-performance applications.
- Impedance:75 ohm cables are typically used for video and TV applications, while 50 ohm cables are standard for data, radio frequency (RF) communication, and wireless systems.
- Frequency Range:Coaxial cables support a wide frequency range, making them suitable for both low-frequency TV signals and high-frequency satellite communications.
Common Sizes and Attenuation (Loss in dB/100 feet at 1 GHz):
|
Cable Type |
Outer Diameter |
Attenuation |
|
RG-6 |
6.9 mm (0.27 in) |
5.65 dB/100 ft |
|
RG-59 |
6.1 mm (0.24 in) |
10.5 dB/100 ft |
|
RG-11 |
10.3 mm (0.41 in) |
3.9 dB/100 ft |
|
RG-58 |
4.95 mm (0.195 in) |
10.6 dB/100 ft |
|
LMR-400 |
10.29 mm (0.405 in) |
3.9 dB/100 ft |
Applications:
- Television (TV) Transmission:Coaxial cables are widely used to connect televisions to antennas, cable boxes, and satellite systems.
- Data Transmission:50-ohm cables like RG-58 and LMR-400 are used in radio frequency transmission for wireless networks and telecommunications.
- CCTV and Surveillance:RG-6 and RG-59 cables are commonly used for closed-circuit television (CCTV) and other short-range video applications.
- Internet Access:Coaxial cables are often used by internet service providers for high-speed data transmission.
Summary:
Coaxial cables are a popular choice for signal transmission in television, internet, radio, and CCTV applications due to their excellent shielding and ability to support high-frequency signals. The key to choosing the right coaxial cable is matching the impedance and attenuation characteristics with the specific application needs.
