Basic NEC with Broadcast Applications by J.L. Smith

By J.L. Smith

Simple NEC with Broadcast purposes addresses laptop modeling of MF directional broadcast antennas and illustrates the resources and liabilities of the Numerical Electromagnetic Code (NEC). The book's "how to" technique finds the basics of NEC operation, teaches broadcast purposes and indicates the reader the right way to use NEC-2 to: version non-radiating networks, ascertain calculations, detune unused towers, layout top-loaded and skirted antennas, reduce coding by means of relocating and duplicating constructions, and masses extra! entire with CD, the e-book is a useful toolkit with software program useful for the layout and research of broadcast antenna arrays. *Learn to exploit the tactic of moments desktop courses to layout and research MF directional antennas *CD encompasses a changed model of NEC-2, courses for geometry viewing and development plotting, in addition to author-written publish processing courses to transform aim box ratios to base force voltages and to make sure the integrity of the NEC-2 research *Concepts taught during this publication observe to research generated through NEC-2, NEC-4, MININEC and different approach to moments laptop courses

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6. A bit of reassurance is in order at this time. We have just used 28 lines to describe one tower and these lines have required considerable effort to generate. It would then appear that an eight-tower array will require 224 hard-earned lines to describe the entire array. But such is not the case. If all towers in the array are identical, then the GM command can be used to duplicate the entire tower with a single line. 3 Tower Configurations array will require only 7 more lines, all of which can be generated with relative ease.

Although one might be inclined to duplicate the physical detail of the antenna as closely as possible, it must be kept in mind that NEC-2 has significant limitations concerning radius changes, segment lengths, spacing, and so on that sometimes make an exact physical duplication yield inaccurate NEC-2 responses. Therefore, the suggestion offered here is that you use the simplest model that conforms to the rules and produces a reasonably close approximation to measured data. Although a model configuration is recommended here, guidelines and experience gained by using the code will aid the user in developing a satisfactory model to suit individual need.

Please read the description of the GM card in Appendix A. The configuration shown in Figure 3-1(d) will be used to illustrate a method of writing such an input file. 9675 meters. 0191 meters. A good starting place in coding the tower is the feed wire, which is also the wire carrying the base insulator. In this case, the insulator, including flanges, is arbitrarily assigned 1 meter in height with the bottom being 1 meter above ground. This assembly includes the spider connections necessary to connect the feed wire to the tower legs and a ring girth around that spider.

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