One of the demonstrable advantages of software-defined receivers is the enormous flexibility and a potential for development of new features, or innovative and improved implementations of existing features.
For example, the functions commonly referred to as IF shift or Passband Tuning are implemented in the WR-G313 receivers in an innovative and powerful way, which combines the real-time spectrum analyzer with the ability to adjust the IF filter passband precisely to suit the received signal.
In the WR-G313 receivers, this feature works in two possible modes:
1. IF Shift (without BFO change) which makes it possible to tune the receiver to another frequency by simply dragging the entire filter passband over a peak of a visible signal.
2. Passband Tuning (with tandem BFO change), making it possible to adjust the filter position in SSB and CW modes without detuning the received station.
The first mode applies if the passband center is dragged using the left mouse button. The second mode is activated if the passband center is dragged using the right-mouse button (a PBT symbol will appear to indicate this mode).
See also the wide-band spectrum analyzer.