Medium Transmitter Model
The Medium Transmitter provides more flexibility by letting you specify gain and power separately instead of entering their product (EIRP) directly, as in the Simple model. The Medium Transmitter Model uses an isotropic, omnidirectional antenna, which is an ideal spherical pattern antenna with constant gain. You can set the following parameters for the Medium model:
Model specs
Frequency is the RF carrier frequency of the transmitter.
Power is the RF power output of the transmitter as measured at the input to the antenna.
Gain is the transmitter antenna's isotropic gain.
Polarization. To specify a polarization model, select Use and select a polarization type. For descriptions of the polarization parameters, see Polarization.
Modulator
STK Communications enables you to select from multiple modulators, including user-defined modulators. STK Modulators can be separated into five general categories: Common Analytical Modulators, Jammer/Interference Modulators, Coded Modulators, External File Modulators, and Script Plugin Modulators.
For more information on modulators, see one of the following categories:
- Common Analytical Modulators
- Jammer/Interference Modulators
- Coded Modulators
- External File Modulators
- Script Plugin Modulator
Filter
To specify a filter model, select Use and browse to a filter model. For more information, see Filter Models.
Additional gains and losses
During communications analyses, it is often necessary to model gains and losses that affect performance but are not defined using built-in analytical models. STK enables you to model these by specifying miscellaneous gains and losses to add to the equation.
Post Transmit Gains/Losses. To define a Gain or Loss, click Add. Enter a brief description of the Gain or Loss in the Identifier field and its value in the Gain field. Remember to make it negative if you are entering a Loss. Once you enter the values, you can click Remove to delete an entry from the table. To change an existing entry, simply edit the fields in the grid. The value in the Pre-Receive field will reflect the net value of all gains and losses recorded in the table.