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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: Space/Satellites (More) AMSAT 21st Space Symposium--2003 -- Proceedings of the AMSAT-NA 21st Space Symposium and AMSAT-NA Annual Meeting. October 17-19, 2003. Toronto, Ontario, Canada. Weather Satellite Handbook -- Explore weather satellites and see your world from a different point of view! SETICon 02, Proceedings of--2002 -- Proceedings of the second SETI League Technical Symposium. April 26-28, 2002. Ewing, NJ. The ARRL Image Communications Handbook -- Use Amateur Radio to see and talk with other hams! Enjoy the imaging modes: NBTV, ATV, SSTV and WEFAX. AMSAT 20th Space Symposium--2002 -- Proceedings of the AMSAT-NA 20th Space Symposium and AMSAT-NA Annual Meeting. November 7-11, 2002. Fort Worth, TX.

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 ().