Changes

Transmitters and receivers are more complicated source and observable types that can be used to model more realistic communication linksEM. A conventional urban propagation scene can be set up using a transmitter and an array of receivers. In order Terrano uses '''Point''' objects to tie up position transmitters and receivers with receiver in the propagation scene. Points are regular CAD objects that can be moved around (translated) in the project workspace, [[EM.Terrano]] uses The point objects that are used to define represent the transmitters and receiversare grouped together and organized as '''Base Sets''' in the "Physical Structure" section of the navigation tree. These When you move the point objects represent the base or change their coordinates, all of their associated transmitters or receivers immediately follow them to the new location . For example, you can define a grid of transmitters and receivers using a base set that is made up of a uniformly spaced array of points and spread them in the computational domain. Hence, they are grouped together as "Base Sets"your scene. You can easily interchange the role of transmitters and receivers in a scene by switching their associated bases. The usefulness of concept of base sets will become apparent later when you place we discuss placement of transmitters or receivers on an irregular terrain and adjust adjustment of their elevation.

To create a new base set, right click on the '''Base Sets''' item of Navigation Tree and select '''Insert Base Set...''' A dialog for setting up the Base Set properties opens up.follow these steps;

* Click the '''OK''' {key|O}} button to close the Base Set Dialog.

Once a base set node has been added to the Navigation Treenavigation tree, it becomes the active node for new object drawingnew objects. Under base sets, you can only draw point objects. All other object creation tools are disabled. A point is initially drawn on the XY plane. Make sure to change the Z-coordinate of your radiatorpoint, otherwise, it your radiator will fall on the global ground at z = 0. You can also create arrays of base points under the same base set. This is particularly useful for setting up receiver grids to compute coverage maps. Simply select a point object and click the '''Array Tool''' of '''Tools Toolbar''' or use the keyboard shortcut "A". Enter values for the X, Y or Z spacing as well as the number of elements along these three directions in the Array Dialog. In most propagation scenes you are interested in 2D horizontal arrays along a fixed Z coordinate (parallel to the XY plane).