== Defining Transmitters & Receivers for Your Propagation Scene ==
=== Defining a Transmitter Sets Set ===
[[File:PROP20(1).png|thumb|400px|EM.Terrano's Transmitter dialog with Transmitters act as sources in a user defined pattern selectedpropagation 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.
[[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]]'''.
To define a A transmitter source in EM.Terrano, first you need set always needs to have at least one be associated with an existing base location point set in your the project workspace. Follow the procedure below:Therefore, you cannot define a transmitter for your scene before drawing a point object under a base location set.
* Right-click on the [[Image:Info_icon.png|40px]] Click here to learn how to define a '''Transmitters''' item [[Glossary of the navigation tree and select EM.Cube'''Insert New s Excitation Sources# | Transmitter Set...]]''' from the contextual menu. This opens of the Transmitter Set dialog.* Choose  To define a name and color for your transmitter setsource in EM. * From the dropdown list labeled '''Associated Base Point Set'''Terrano, select the desired set.* In the "Custom Pattern Parameters", click the {{key|Import Pattern}} button first you need to set the path for the radiation data file. This opens up the standard Windows Open dialog, with the default file type or extension set to '''.RAD'''. Browse have at least one base location point in your folders to find the right data fileproject workspace. * You can also rotate Follow the imported pattern about the three principal axes. Enter the rotation angles other than the zero default values, if necessary.* Click the {{key|OK}} button of the dialog to close it. procedure below:
<table>
</tr>
</table>
Â
Once you define a new transmitter set, its name is added in the '''Transmitters''' section of the navigation tree. The color of all the base points associated with the newly defined transmitter set changes and an additional little ball with the transmitter color (red by default) appears at the location of each associated base point. You can open the property dialog of the transmitter set and modify a number of parameters including the '''Baseband Power''' in Watts and the broadcast signal '''Phase''' in degrees. The default transmitter power level is 1W OR 30dBm. There is also a check box labeled '''Custom Power''', which is checked by default. In that case, the power and phase boxes are enabled and you can change the default 1W power and 0° phase values as you wish. [[EM.Cube]]'s ".RAD" radiation pattern files usually contain the value of "Total Radiated Power" in their file header. This quantity is calculated based on the particular excitation mechanism that was used to generate the pattern file in the original [[EM.Cube]] module. When the "Custom Power" check box is unchecked, EM.Terrano will use the total radiated power value of the radiation file for the SBR simulation.
<table>
</tr>
</table>
Â
A new transmitter set entry is added in the '''Transmitters''' section of the navigation tree. After defining a transmitter set, the base points associated with it change their color to the transmitter color, which is red by default. In the Transmitter Set dialog, you can also set the '''Baseband Power''' of your transmitter in Watts and its '''Phase''' in degrees. There is a check box labeled '''Custom Power''', which is checked by default. In that case, the power and phase boxes are enabled and you can change the default 1W power and 0° phase values as you wish. [[EM.Cube]]'s ".RAD" radiation pattern files usually contain the value of "Total Radiated Power" in their file header. This quantity is calculated based on the particular excitation mechanism that was used to generate the pattern file in the original [[EM.Cube]] module. When the "Custom Power" check box is unchecked, EM.Terrano will use the total radiated power value of the radiation file for SBR calculations.
EM.Terrano allows you to define a basic '''Heterodyne Transmitter Chain'''. Click the {{key|Transmitter Chain}} button of the Transmitter Set dialog to open the Transmitter Chain dialog. As shown in the figure below, you can specify the characteristics of the baseband/IF amplifier, mixer and power amplifier (PA) including stage gains and impedance mismatch factors (IMF) as well as the characteristics of the transmission line segment that connects the PA to the antenna. Note that the transmitting antenna characteristics are automatically filled from using contents of the radiation file. The transmitter Chain dialog also calculates and reports the "Total Transmitter Chain Gain" based on your input. When you close this dialog and return to the Transmitter Set dialog, you will see the calculated value of the Effective Isotropic Radiated Power (EIRP) of your transmitter in dBm.
</table>
=== Defining a Receiver Sets Set ===
[[File:PROP21(1).png|thumb|400px|EM.Terrano's preliminary Receiver dialog.]]