M3JWKJOHN W. KIRBY • AMATEUR RADIO

ENGINEERING / M3JWK

Aerials, Feeders and Practical Installation

Good radio starts with thoughtful design and safe construction

An aerial is part of a system

The performance of a station depends on the aerial, its mounting position, feedline losses, matching and local environment. A more expensive transceiver will not compensate for poor siting or a damaged coaxial connector.

VHF and UHF priorities

At 2 metres and 70 centimetres, mounting height, line of sight and feeder quality can make a substantial difference. The position of a metal gutter, wall bracket or nearby structure may affect performance. Weatherproofing and proper strain relief matter.

Build safely

Mounting systems must take account of wind loading, secure fixing, safe access, lightning and electrical safety. Do not improvise structural fixings or work near overhead power lines. RF exposure compliance must also be considered under the relevant licence requirements.

What will be documented

The station journal can share antenna measurements, SWR, installation photographs and lessons learned. Planned parts will be labelled as planned, not displayed as operational installations before they exist.

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