Feedline & Connectors

Getting power from the shack to the antenna without losing it on the way.

Feedline is the least glamorous part of a station and one of the most common sources of lost signal. This category covers cable types, the connectors that terminate them, and the transformers and chokes that keep current where it belongs.

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Antenna

Coaxial Cable

The standard unbalanced feedline: centre conductor, shield, and the dielectric between them.

Z: 50 ohmloss: 2.1 dB/30m

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Antenna

Ladder Line

Two parallel conductors held apart by spacers. Very low loss, and very fussy.

Z: 450 ohmloss: 0.3 dB/30m

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Antenna

PL-259 Connector

The ubiquitous HF connector. Not constant impedance, but perfectly serviceable below 300 MHz.

Z: 50 ohmf: DC-300 MHz

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Antenna

N Connector

A constant-impedance, threaded connector that holds up at VHF and above.

Z: 50 ohmf: DC-11 GHz

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Antenna

Balun

Bridges the balanced antenna and the unbalanced coax, with or without a ratio change.

ratio: 1:1 / 4:1f: 1.8-30 MHz

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Antenna

Feedline Choke

Stops shield current on the coax, which is the usual cause of mysterious RF interference.

Z: >1000 ohmf: 3.5-30 MHz

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Feedline & Connectors

Coaxial Cable

Ladder Line

PL-259 Connector

N Connector

Balun

Feedline Choke

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