The Davis RF High-Quality RG-8U Coaxial Cable is a well-regarded type of coaxial cable used for radio frequency applications. RG-8U coaxial cable is known for having a larger diameter and relatively low signal loss, making it suitable for longer cable runs and higher-power transmissions.

Key features of the Davis RF version often include:

1. High-quality shielding: Provides excellent resistance to signal interference and minimizes signal loss.
2. Durability: Built to withstand outdoor elements, making it suitable for external antenna connections.
3. Impedance: It typically has a characteristic impedance of 50 ohms, commonly used in amateur radio, CB (Citizens Band) radio, and some commercial applications.
4. Compatibility: Useful in HF (High Frequency) and VHF (Very High Frequency) applications, connecting antennas, radios, and other RF devices.

Specifications:

1. Impedance: 50 Ohms (characteristic impedance)
2. Outer Diameter: Approximately 10.3 mm (0.405 inches)
3. Dielectric: Typically made of solid or foam polyethylene for good insulation and lower signal loss.
4. Shielding: Dual shielding (braid and foil, depending on the specific variant) provides excellent RF shielding to minimize interference.
5. Center Conductor: Often a solid copper or copper-clad steel conductor to ensure high conductivity and signal integrity.
6. Frequency Range: Suitable for HF, VHF, and some UHF applications, typically up to 1 GHz.
7. Signal Loss (Attenuation): Loss varies by frequency, but generally, RG-8U has lower loss per 100 feet compared to thinner coax cables like RG-58. For example:
   • At 30 MHz (HF range), typical loss might be around 0.6-0.7 dB per 100 feet.
   • At 100 MHz (VHF range), loss may be around 1.4-1.5 dB per 100 feet.
   • Higher frequencies will experience greater loss.
8. Power Handling Capacity: Can handle relatively high power levels (hundreds to thousands of watts), with exact ratings depending on frequency, length, and specific construction of the cable.
9. Jacket Material: The outer jacket is often made of PVC or a weather-resistant material suitable for outdoor installations, providing durability and protection against the elements.