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 strong suite of CD software program, the reader may have a whole answer for developing or utilizing an antenna - bar the particular undefined! The software program offers an easy Windows-based reduction to undertaking the layout calculations on the middle of winning antenna layout. the entire person must do is choose the antenna variety and set the frequency - a way more enjoyable and not more blunders services procedure than utilizing a traditional calculator to unravel formulae. the recent version has been revised to incorporate additional instances of propagation, extra antennas and likewise new chapters - Small Loop Antennas (a subject of substantial curiosity, which has been the topic of a lot fresh debate within the beginner 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 known. Antenna designers, no matter if hobbyist or technician, may be guaranteed they wish glance no additional than Antenna Toolkit for the entire consultant to knowing the practicalities of utilizing and designing antennas this present day. a whole resolution for antenna layout in a single package.Includes loose CD-ROM with state-of-the-art software program for all layout calculations.The definitive advisor to antenna layout for radio amateurs and short-wave listeners.
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Extra resources for Antenna Toolkit, Second Edition
1. You can see that doubling a signal strength results in a +3 dB gain, while halving it produces a À3 dB loss. To put these ﬁgures into perspective, most S-meters on receivers use a scaling factor of 6 dB per S-unit (some use 3 dB per S-unit). 9 26 ANTENNA TOOLKIT needed for barely perceptible but reliable communication for a listener who tries hard to hear what is being said. e. they work the same on transmit as they do on receive. If an antenna has a certain gain and directivity on transmit, then that exact same pattern is seen in the receive mode.
As a consequence, many professional antenna installers go to pains to make the transmission line j/2 or an integer multiple of j/2. The VSWR and impedance looking into the line will reﬂect the situation at the feedpoint. Be aware that the velocity factor of the transmission line reduces the physical length required to make an electrical half wavelength. (3) An easy way to check if your SWR measurements are being accurately made is as follows: Add a piece (j/8 to j/4 wavelength) of identical line to your feedline.
The act of making these impedances equal to each other (a very desirable thing, as you will ﬁnd out) is called impedance matching, and is covered in Chapter 11. Transmission lines come in a bewildering variety of species, but there are only a few basic types: parallel open lead, twin-lead, and coaxial cable are the main types that we need to consider. 4 shows all of these varieties. 4A. It consists of a pair of wires, run parallel to each other, and separated by a constant space. Insulating spacers (made of ceramic, nylon, or some other material) are used in practical parallel open line to keep the distance between the conductors constant.
Antenna Toolkit, Second Edition by Joseph Carr, Joe Carr