=== Hertzian Dipole Sources ===
[[File:PROP18(1).png|thumb|[[Propagation Module]]'s Transmitter dialog with a short dipole radiator selected]]
Earlier versions of EM.Cube's [[Propagation Module]] used to offer an isotropic radiator with vertical or horizontal polarization as the simplest transmitter type. This release of EM.Cube has abandoned isotropic radiator transmitters because they do not exist physically in a real world. Instead, the default transmitter radiator type is now a Hertzian dipole. Note that before defining a transmitter, first you have to define a base set to establish the location of the transmitter. Most simulation scenes involve only a single transmitter. Your base set can be made up of a single point for this purpose.
To define a new Transmitter Set, go to the '''Sources''' section of the Navigation Tree, right click on the '''Transmitters''' item and select '''Insert Transmitter...''' A dialog opens up that contains a default name for the new Transmitter Set as well as a dropdown list labeled '''Select Base Set'''. In this list you will see all the available base sets already defined in the project workspace. Select the desired base set to associate with the transmitter set. Note that if the base set contains more than one point, then more than one transmitter will be created and contained in your transmitter set. After defining a transmitter set, the base points change their color to the transmitter color, which is red by default.
In the "Radiator" section of the dialog, you have two options to choose from: "Short Dipole" and "User Defined". The default option is short dipole. A short dipole radiator has a '''Length'''''dl'' expressed in project units, a current '''Amplitude''' in Amperes and a current '''Phase''' in degrees. The '''Direction''' of the dipole is determined by its unit vector that has three X, Y and Z components. By default, a Z-directed short dipole radiator is assumed. You can change all parameters of the dipole as you wish. Keep in mind that all the transmitters belonging to the same set have parallel radiators with identical properties. [[File:PROP18(1).png]] Figure 1: [[Propagation Module]]'s Transmitter dialog with a short dipole radiator selected.
=== Defining Base Point Sets ===