Basic NEC with Broadcast Applications by J.L. Smith

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By J.L. Smith

Easy NEC with Broadcast functions 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" strategy finds the basics of NEC operation, teaches broadcast functions and exhibits the reader the way to use NEC-2 to: version non-radiating networks, be certain calculations, detune unused towers, layout top-loaded and skirted antennas, reduce coding through relocating and duplicating buildings, and lots more and plenty extra! entire with CD, the ebook is a useful toolkit with software program precious for the layout and research of broadcast antenna arrays. *Learn to exploit the tactic of moments laptop courses to layout and learn MF directional antennas *CD encompasses a changed model of NEC-2, courses for geometry viewing and trend plotting, in addition to author-written put up processing courses to transform aim box ratios to base force voltages and to ensure 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 machine courses

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Example text

The triangular tower in this example has a 24-inch face (F ϭ 24Љ). If we set the tower such that it is centered on the origin with one corner pointing north, the X-Y coordinates of the north corner are calculated by recognizing that the north corner of the tower is located on the ϩX axis at a distance equal to the radius of a circumscribed circle about the tower or X1 ϭ F(cosec 60Њ)/2. The Y coordinate,Y1, of this corner is, of course, zero. The X coordinate of the lower right corner is the negative of the radius of a circle inscribed within the tower or X2 ϭ ϪF(cot 60Њ)/2.

2-3. Using the data given in the output file created by the modified listing in exercise 2-2, calculate the total current moment for the tower. How does this current moment compare with that determined from the output data of exercise 2-1? Why? The antenna towers and any other conducting objects in the vicinity that affect its performance must be included in the model. 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.

OUT. OUT) in the currently active folder. If your input file contains an error, NEC-2 does not signal that error during the run time. Instead, it records the error in the output file and aborts the run if it is a fatal error. Therefore, you must examine the output file to identify an error. A brief description of the error will appear at the place in the output file where the error occurred. More error descriptions are given in general in Appendix B. The output file can be quite long and it contains some lines longer than 100 characters; thus, it is difficult to read in a DOS window.

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