By Joseph Carr, Joe Carr
Joe Carr has supplied radio amateurs and short-wave listeners with the definitive layout consultant for sending and receiving radio indications with Antenna Toolkit second edition.Together with the robust suite of CD software program, the reader can have an entire answer for developing or utilizing an antenna - bar the particular undefined! The software program offers an easy Windows-based relief to undertaking the layout calculations on the middle of profitable antenna layout. all of the person must do is pick out the antenna style and set the frequency - a way more enjoyable and no more errors providers technique than utilizing a standard calculator to resolve formulae. the recent variation has been revised to incorporate extra situations of propagation, extra antennas and likewise new chapters - Small Loop Antennas (a subject of substantial curiosity, which has been the topic of a lot contemporary debate within the novice radio press); and Yagi Beam Antennas (widely used at HF and VHF). The CD software program has additionally been updated.Joe Carr's services within the quarter of antenna layout is famous. Antenna designers, no matter if hobbyist or technician, should be guaranteed they want glance no additional than Antenna Toolkit for the whole consultant to knowing the practicalities of utilizing and designing antennas this day. an entire resolution for antenna layout in a single package.Includes unfastened CD-ROM with state-of-the-art software program for all layout calculations.The definitive consultant to antenna layout for radio amateurs and short-wave listeners.
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Additional info for Antenna Toolkit, Second Edition
The number of strands used to make the wire sets the ﬂexibility of the wire. Coarse stranded wire has fewer strands, and is less ﬂexible than wire of the same overall diameter that is made up of many more strands of ﬁner wire. 1 Antennas should normally be built with stranded wire. The reason is that the stranded wire stands up better to the constant ﬂexing an antenna experiences, especially in windy areas. All wire will begin to stretch because of both gravity and wind. Solid wire will stretch rather rapidly, and eventually come to a point where it is too thin at the strain point to hold its own weight – and will come tumbling down.
CHAPTER 2 Antenna basics Before looking at the various antennas we need to look at some of the basics of antenna systems. In this chapter you will learn some of these basics. And while they will not make you a red-hot professional antenna engineer they will set you up well enough to understand this book and others on amateur and hobbyist antennas. We will look at the matter of antenna radiation, antenna patterns, the symbols used to represent antennas, voltage standing wave ratio (VSWR), impedance, and various methods suitable for constructing wire antennas in the high-frequency (HF) and very high-frequency (VHF) regions of the spectrum.
For a center-fed halfwavelength dipole, or a bottom-fed quarter-wavelength vertical, the proper way to resonate the antenna is to adjust its length to the correct point. The formulas in the books and magazines only give approximate lengths – the real length is found from experimentation on the particular antenna after it is installed. Even commercial antennas are adjusted this way. On certain CB mobile antennas, for example, this trick is done by raising (or lowering) the radiator while watching the VSWR meter.