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ECLM Chapters ECLM Homepage Introduction Operating Practices Rules and Regulations Electrical Principles Components and Building Blocks Electronic Circuits Radio Signals and Measurements Radio Modes and Equipment Antenna and Feed Lines Topics in Radio Propagation Safety   ARRL Products: Low Power/QRP (More) QRP Romps! -- Now you can work the world with low power! ARRL's Wire Antenna Classics -- An entire book devoted to wire antennas, from the simple to the complex. ARRL's Low Power Communication with 40-meter CW Cub Transceiver Kit -- Build and operate low-power radio gear--the QRP way! 3rd Edition. Includes the 40-meter CW Cub Transceiver Kit. ARRL's Low Power Communication -- Build and operate low-power radio gear-the QRP way! 3rd Edition. The ARRL Antenna Designer's Notebook -- Now Shipping! -- A rarely presented view of antenna design-from Imagination to Aluminum!

Chapter 9 – Antenna and Feed Lines &
Chapter 10 – 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 sections of the Extra Class exam will support you as you study.

Antennas

• 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

Transmission Lines

• ARRL TIS Transmission Lines - articles and references about feed lines and SWR
• ARRL TIS Antenna Tuners - information on impedance matching equipment

Propagation

• 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

Beacon Stations

• 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

Solar Activity and Geophysical Information

• Spaceweather - what’s going on around the Earth
• HF Radio - real-time information and predictions