Definition
A coaxial cable in which the inner conductor is held in place along the center of the outer conductor by a series of evenly spaced insulating beads, rather than by a continuous solid dielectric. The beads keep the two conductors precisely concentric while leaving most of the space between them as air, which has very low signal loss at high radio frequencies.
Plain English
A radio cable built like a tube with a wire running down the middle, held perfectly centered by small insulating spacers placed at intervals. The gaps between the spacers are just air, which lets high-frequency signals travel through with very little loss.
Context Anchor
Seen in aircraft radio, navigation, radar, and antenna installation or maintenance discussions.
Derivation
‘Coaxial’ comes from Latin co- (together) and axis (axle) — two conductors sharing one axis, one inside the other. ‘Beaded’ refers to the small ring-shaped insulators strung along the inner wire like beads on a string. The name describes the construction directly.
Why Pilots Care
Provides low-loss signal paths for communication and navigation radios, reducing interference and maintaining reliable performance in demanding flight environments.
Analogy
Think of a wire running through the center of a pipe, held in place by small plastic rings. The rings keep the wire centered without filling the whole space around it.
Intuition Check
“Beaded” does not mean decorative here. It means the cable uses small insulating beads as spacers inside the cable.
Example Sentence 1
The technician replaced the antenna feedline with beaded coaxial cable to reduce signal loss on the high-frequency run.
Example Sentence 2
Beaded coaxial cable is often chosen for high-power transmitter runs because the air dielectric reduces signal attenuation.