Coaxial Cable Types & Characteristics for Amateur Radio
Understanding the different types of coaxial cable and their electrical and mechanical characteristics
is essential for building an efficient amateur radio station. Coaxial cables vary in impedance, shielding, loss,
flexibility, and power-handling capability, all of which directly affect signal performance.
This guide explains common coaxial cable families used in amateur radio and highlights the characteristics that determine
where each type performs best.
RG-Series Coaxial Cable
Traditional RG-series coaxial cables have been used in amateur radio for decades. These cables are typically flexible,
durable, and suitable for HF and lower VHF operation.
- RG-8 / RG-213: Full-size 50-ohm coax with good power handling and moderate loss
- RG-8X: Smaller, lighter cable suited for short runs and portable installations
- RG-58: Compact coax commonly used for jumpers and low-power applications
LMR Low-Loss Coaxial Cable
LMR-series coaxial cable is designed to reduce signal loss at VHF and UHF frequencies. These cables use improved
dielectric materials and shielding to provide better attenuation performance over longer runs.
- LMR-240: Lower loss than RG-8X with improved shielding
- LMR-400: Popular low-loss option for base stations and long feedlines
- LMR-600: Very low-loss cable used in demanding installations
Hardline & Heliax Coax
Hardline coaxial cable, often referred to as Heliax, offers extremely low signal loss and high power handling.
These cables are typically used in permanent installations where maximum performance is required.
- Corrugated copper outer conductors for low attenuation
- Excellent durability for outdoor and tower installations
- Less flexible than standard coax, requiring careful routing
Shielding & Construction
Shielding effectiveness plays a major role in noise rejection and signal containment. Coaxial cables may use:
- Single or double braided shields
- Foil and braid combinations
- Solid or stranded center conductors
Higher-quality shielding improves performance in high-RFI environments and reduces signal leakage.
Selecting the Right Coax Type
No single coaxial cable is ideal for every application. Selecting the right type depends on frequency, run length,
power level, and installation conditions. Understanding cable characteristics helps operators balance performance,
cost, and practicality.
Related Coax & Feedline Guides
→ How to Choose the Right Coaxial Cable
→ Feedline Loss, Attenuation & Frequency Effects
→ Installing & Weatherproofing Coaxial Cable
This page is part of the Elmer Reference Library and provides a practical overview of coaxial cable
types and characteristics commonly used in amateur radio installations.
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