Basic NEC with Broadcast Applications by J.L. Smith

By J.L. Smith

Basic NEC with Broadcast Applications addresses computing device modeling of MF directional broadcast antennas and illustrates the resources and liabilities of the Numerical Electromagnetic Code (NEC). The book's "how to" process unearths the basics of NEC operation, teaches broadcast purposes and exhibits the reader tips on how to use NEC-2 to: version non-radiating networks, be sure calculations, detune unused towers, layout top-loaded and skirted antennas, reduce coding by way of relocating and duplicating constructions, and masses extra! whole with CD, the publication is a useful toolkit with software program invaluable for the layout and research of broadcast antenna arrays.

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0 meters). 9675 meters must be added above the spider. 7374 segments on the tower. 7374 segments to be stacked. 2475 meters. 0191 Next comes the standard tower section (a component of wire 4), which is very similar to the height adjuster section. 048 meters) in height. 0191 It is important to notice here that this standard section starts with the wire at tag 104, segment 1 and it includes five more wires, each with tag 104 and each with one segment. The entire section carries the tag 104 and there are a total of six segments in the standard section.

3 Two-Wire Configuration The two-wire configuration shown in Figure 3-1(c) is a modified representation of the four-wire configuration. Wires 1, 2, and 3 of Figure 3-1(b) have been combined into a single vertical feed wire in Figure 3-1(c). The length and equivalent radius of this wire can be used as an adjustment parameter to match calculated and measured impedance. The logic here is that the equivalent radius of the ground connections to the tuning network cabinet as well as that of the base insulator and pedestal are unknown and probably large, so some license can be taken in setting a value for them.

EXE. 3-3. 4214 meters northeast of the existing tower. 3-4. EXE. 3-5. BMP file. 1 The Coordinate System An antenna array is described to NEC-2 as a series of straight wires whose locations are specified in terms of their end coordinates. To specify the end coordinates, NEC-2 uses the conventional spherical coordinate system commonly used in mathematics, as sketched in Figure 4-1. Azimuth displacement (Φ) in the X-Y plane is measured from the ϩX-axis and increases in the counterclockwise direction.

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