Transmitters act as sources in a propagation scene. A transmitter is a point radiator with a fully polarimetric radiation pattern defined over the entire 3D space in the standard spherical coordinate system. You can model a radiating structure using [[EM.Cube]]'s other computational modules, [[EM.Tempo]], [[EM.Picasso]], [[EM.Libera]] or [[EM.Illumina]], and generate a 3D radiation pattern data file for it. The far-field radiation patter data are stored in a specially formatted file with a "'''.RAD'''" file extension. It file contains columns of spherical φ and θ angles as well as the real and imaginary parts of the complex-valued far-zoned electric field components '''E<sub>θ</sub>''' and '''E<sub>φ</sub>'''. The θ- and φ-components of the far-zone electric field determine the polarization of the transmitting radiator.
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[[Image:Info_icon.png|40px]] Click here to learn more about the format of '''[[Data_Visualization_and_Processing#Far_Field_Data_Files | Radiation Pattern Files]]'''.
A transmitter set always needs to be associated with an existing base location set in the project workspace. Therefore, you cannot define a transmitter for your scene before drawing a point object under a base location set.
[[Image:Info_icon.png|40px]] Click here to learn how to define a '''[[Glossary of EM.Cube's Excitation Sources# | Transmitter Set]]'''.
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To define a transmitter source in EM.Terrano, first you need to have at least one base location point in your project workspace. Follow the procedure below:
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<td> [[File:PROP20A.png|thumb|600pxleft|720px|EM.Terrano's Transmitter Chain transmitter chain dialog.]] </td>
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