By J.L. Smith

ISBN-10: 0240810732

ISBN-13: 9780240810737

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" method unearths the basics of NEC operation, teaches broadcast functions and indicates the reader tips on how to use NEC-2 to: version non-radiating networks, determine calculations, detune unused towers, layout top-loaded and skirted antennas, reduce coding by means of relocating and duplicating buildings, and lots more and plenty extra! entire with CD, the publication is a useful toolkit with software program important for the layout and research of broadcast antenna arrays. *Learn to take advantage of the tactic of moments desktop courses to layout and research MF directional antennas *CD contains a changed model of NEC-2, courses for geometry viewing and development plotting, in addition to author-written submit processing courses to transform goal box ratios to base force voltages and to make sure the integrity of the NEC-2 research *Concepts taught during this e-book follow to research generated through NEC-2, NEC-4, MININEC and different approach to moments laptop courses

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Additional resources for Basic NEC with Broadcast Applications

Example text

The Z coordinates are the same in either system.

The coordinates of the corners can be calculated as follows. 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 broadcaster measures the elevation angle, theta (Θ), referenced to the horizon with the zenith being taken as 90Њ. It is plain that the two coordinate systems differ, so those of us who use NEC-2 for broadcast work have to reconcile these differences by defining a coordinate system that is convenient for the broadcaster to use and is also acceptable to NEC-2. Fortunately, that is not a difficult task. NEC-2 expects to receive XYZ coordinates. The X coordinate and the Z coordinate are specified the same by both NEC-2 and the broadcaster, so no change is required in specifying those two coordinates.

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Basic NEC with Broadcast Applications by J.L. Smith

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