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GCLM Chapters GCLM Homepage Introduction Procedures and Practices Rules and Regulations Components and Circuits Radio Signals and Equipment Antennas Propagation Electrical and RF Safety   ARRL Products: Operating (More) The ARRL DXCC Handbook -- Worldwide ham radio operating and the ARRL DXCC Award! FCC Rules and Regulations for the Amateur Radio Service -- Now Shipping! -- FCC Part 97 Rules & Regulations. Now Including: The FCC Rules and You Radio Amateur Callbook CD-ROM (2010) -- Coming early December! -- Winter Edition! More than 1,600,000 licensed radio amateurs! Includes International and North American listings and Amateur Radio Prefix Maps. The ARRL Operating Manual for Radio Amateurs -- Everything for the active ham radio operator! Explore new activities, learn new skills, find new references and more. The ARRL Repeater Directory (Pocket-sized) -- Now Shipping! -- 2009/2010 Edition. Find Repeaters FASTER!

Chapter 6 – Antennas

Antennas are the key to radio — without them, signals are not transmitted or received.  Amateurs enjoy building and experimenting with antennas and you will, too!  Section 6 covers this important section in detail.

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

Table 6-1 Feedline Characteristics

The table printed in the 1st printing of the General Class License Manual is in error. The following table contains the correct typical loss data for several popular types of coaxial cable.  Cable loss and other parameters such as velocity of propagation vary between manufacturers and sometimes from batch to batch.  If you are using the cable in a way that depends on an exact value, measure the cable with test equipment.  The values in the table below were calculated using the on-line calculator at Times-Microwave ().