Changes

In EM.Terrano, transmitters and receivers are indeed point radiators used for transmitting and receiving signals at different locations of the propagation scene. From a geometric point of view, both transmitters and receivers are represented by point objects or point arrays. These are grouped as base locations in the "Physical Structure" section of the navigation tree. As radiators, transmitters and receivers are defined by a radiator type with a certain far-field radiation pattern. Consistent with [[EM.Cube]]'s other computational modules, transmitters are categorizes as an excitation source, while receivers are categorized as a project observable. In other words, a transmitter is used to generate electromagnetic waves that propagate in the physical scene. A receiver, on the other hand, is used to compute the received fields and received signal power or signal-to-noise ratio (SNR). For this reason, transmitters are defined and listed under the "Sources" sections of the navigation tree, while receivers are defined and listed under the "Observables" section.  EM.Terrano provides three radiator types for transmitter sets: *Half-wave dipole oriented along of the the principal axes*User defined (arbitrary) antenna with imported far-field radiation pattern*Two collocated, orthogonally polarized, isotropic radiators  EM.Terrano also provides three radiator types for receiver sets: *Polarization-matched isotropic radiator*Half-wave dipole oriented along of the the principal axes*User defined (arbitrary) antenna with imported far-field radiation pattern The default transmitter radiator type is a vertical (Z-directed) half-wave dipole, while the default receiver radiator type is isotropic.  There are three different ways to define a transmitter set or a receiver set: *By defining point objects or point arrays under physical base location sets in the navigation tree and then associating them with a transmitter or receiver set*Using Python commands emag_tx, emag_rx, emag_tx_array and emag_rx_array*Using the "Basic Link" wizard