Antennas, Feed Lines, & Topics in Radio Propagation
Antennas and propagation are the heart of what makes radio a unique form of communication. Amateurs enjoy building and experimenting with antennas, one of the most active areas of experimentation. Amateurs have also excelled over the years in ferreting out new and useful modes of propagation. Resources for these two chapters of the Extra Class exam will support you as you study.
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- How Antennas Work - a collection of antenna articles
- The ARRL Antenna Book - the amateur’s standard reference for information on antennas, feed lines, and propagation
- Antennas - Service and Education - L.B. Cebik W4RNL’s informative Web site on antennas
- Antennex - antenna experimenter Web magazine
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- ARRL TIS Transmission Lines - articles and references about feed lines and SWR
- ARRL TIS Antenna Tuners - information on impedance matching equipment
- ARRL Guide to Antenna Tuners - publication
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- Propagation - several introductory and basic propagation articles
- RSGB Propagation - thorough list of resources from the Radio Society of Great Britain
- AC6V Propagation Resource List - compilation of propagation links and resources
- Propagation Prediction Software - software package list on the AC6V Web site
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- NCDXF Beacons - the Northern California DX Foundation maintains a world-wide system of beacons for hams to use for checking HF propagation
- Directories of Beacon Stations
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Solar Activity and Geophysical Information
- Spaceweather - what’s going on around the Earth
- HF Radio - real-time information and predictions
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Click here to download a PDF file with a complete explanation of the Smith Chart with some design and calculation examples.
The Smith Chart Amateur Radio Society publishes a history of Philip Smith and his chart.
Licensing, Education & Training >> Getting Licensed >> Upgrading to an Extra License >> Extra Class License Manual >> Chapters 9 & 10 - Antennas, Feed Lines, & Topics in Radio Propagation
