This is the System Screen for the
software. It represents a basic component lineup for a frequency conversion stage. Each of
the triangular yellow icons represents a mini cascade of five components (passive or active),
the square green icons represent a filter, the round blue icon represents a mixer. and the
square red icon represents a local oscillator.
The relative positions of the input amplifier/filter can be swapped (filter first), as
can the output amplifier/filter positions. To edit each component, just click on the icon
and a window will open with all the necessary fields. Every input is fully tested for validity
so that erroneous data cannot be entered.
The white rectangle at the input represents all of the input parameters, and can be edited
by clicking on it. If desired, the output data of a previous stage (as with a multiple frequency
conversion) can be used rather than simply sweeping the input across a frequency range.
All necessary mixer parameters, including the spur table, is set by clicking on the mixer
icon. Mixer spur table files can be loaded from the editor screen.
The local Oscillator (LO) can be either a fixed or swept frequency, and its power level
set in its editing window.
Once all the parameters are set, then out data is viewed in the graph at the bottom. All
parameters can be individually turned on or off. Graph scale can be set manually, defined
with the mouse, or allowed to auto-scale. Clicking on the white Midband Output rectangle opens
a wind with a tabulated list of output numerical values.