Transcription of Antenna Height and Communications Effectiveness
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Antenna Height and Communications Effectiveness
Antenna HeightandCommunications EffectivenessSecond EditionA Guide for City Planners and Amateur Radio OperatorsBy R. Dean Straw, N6BV, and Gerald L. Hall, K1 TDSenior Assistant Technical Editor and Retired Associate Technical EditorCopyright 1999 The American Radio Relay League, Main StreetNewington, CT 06111 Page 1 Executive SummaryAmateur radio operators, or hams as they are called, communicate with stations located allover the world. Some contacts may be local in nature, while others may be literally halfwayaround the world. Hams use a variety of internationally allocated frequencies to accomplish for local contacts, which are primarily made on Very High and Ultra HighFrequencies (VHF and UHF), communicating between any two points on the earth rely primarilyon high-frequency (HF) signals propagating through the ionosphere. The earth s ionosphere actsmuch like a mirror at heights of about 150 miles.
horizontal antennas. Ionospheric Propagation Frequencies between 3 and 30 megahertz (abbreviated MHz) are often called the “short-wave” bands. In engineering terms this range of frequencies is defined as the high-frequency or ... Earth itself also acts as a reflector of radio waves coming down from the ionosphere. Quite often
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