What is RG-59 Siamese Coax Cable?


What is RG-59 Siamese Coax Cable?

What is RG-59 Siamese Coax Cable?

RG-59 Siamese coaxial cable is a specialized type of cable that combines a standard RG59 coaxial cable with an additional power cable, allowing for the simultaneous transmission of video signals and power. This design makes it particularly well-suited for security systems, such as CCTV installations, where cameras require both video signal transmission and power supply.

In this article, we’ll explore the uses of RG-59 Siamese cable, its technical specifications, and answer frequently asked questions about this versatile cable.

Common Coaxial Cable Sizes

Coaxial cables come in several sizes, each suited to different applications. The most common types include:

  1. RG-59
    • Smaller diameter and lighter weight.
    • Best suited for short-distance, low-frequency applications like older CCTV systems.
  2. RG-6
    • Thicker and better-shielded than RG-59.
    • Handles higher frequencies, making it ideal for HDTV, satellite, and broadband internet.
  3. RG-11
    • Largest diameter with the least signal loss.
    • Used for long-distance and outdoor installations.

What is RG-59 Cable Used For?

RG-59 Siamese coaxial cable is primarily used in applications that require both video signal transmission and a power source, including:

  1. CCTV Security Systems
    The most common use of RG-59 Siamese cable is in CCTV installations. It provides a single cable solution to connect security cameras to a central recorder (DVR or NVR) while also supplying power to the cameras.

  2. Analog and HD Video Transmission
    RG-59 is ideal for transmitting analog video signals or HD signals over short distances, typically up to 750 feet. It supports technologies like HD-CVI, HD-TVI, and AHD.

  3. Residential and Commercial Surveillance
    RG59 Siamese cable is widely used in both residential and commercial settings due to its convenience and cost-effectiveness.

  4. Audio-Visual Systems
    It can also be used in setups that require low-frequency signal transmission for AV systems, such as intercoms or simple home theater systems.

Specs

RG-59 Siamese cable is designed to handle both video signal and power requirements. Below are its technical specifications:

Coaxial Cable Component

  • Core Conductor: Made of copper or copper-clad steel, which transmits the video signal.
  • Impedance: 75 ohms, optimized for video signal transmission.
  • Shielding: Single or double shielding with aluminum foil or braided wire to minimize electromagnetic interference (EMI).
  • Outer Jacket: Typically made of PVC for indoor installations or polyethylene for outdoor applications.

Power Cable Component

  • Wire Gauge: Typically 18 AWG (American Wire Gauge), sufficient to carry power over moderate distances.
  • Conductors: Two insulated copper wires, one for positive (+) and one for negative (-) power.
  • Voltage Support: Suitable for low-voltage applications, typically 12V or 24V DC.

Physical Characteristics

  • Cable Diameter: Approximately 6 mm for the coaxial part, with an additional 4-5 mm for the power cable.
  • Length Options: Available in pre-cut lengths (e.g., 100 ft, 500 ft) or bulk reels for custom installations.
  • Signal Range: Effective for video signals up to 750 feet; may require amplifiers for longer runs.

FAQ

The primary difference lies in their use cases. RG-59 Siamese is designed for CCTV systems with a built-in power cable, whereas RG-6 is typically used for higher-frequency applications like HDTV and satellite TV. RG-59 also has a smaller core and less shielding compared to RG-6.

No, RG-59 is not ideal for 4K video. It is best suited for standard analog and HD resolutions. For 4K, RG-6 or fiber optic cables are recommended.

Yes, but only if the cable is rated for outdoor use. Outdoor-rated RG-59 Siamese cables have weatherproof and UV-resistant jackets.

The power transmission distance depends on the gauge of the power wire and the camera’s power requirements. For 18 AWG wires, the typical range is around 200-300 feet.

Yes, direct burial-rated RG-59 Siamese cables are available for underground installations. These cables feature robust, weatherproof jackets to withstand moisture and soil conditions.

RG-59 Siamese coaxial cable is a practical and cost-effective solution for CCTV systems and similar applications that require video and power transmission in a single cable. Its integrated design simplifies installation, reduces clutter, and ensures reliable performance for security and surveillance systems. Whether for residential or commercial use, RG59 Siamese cable remains a trusted choice for professionals and DIY installers alike.

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