Most spectrum analysers have a functionality called "Zero Span". What this does is to show the centre frequency in time domain, as opposed to the frequency domain of the spectrum: the result is similar to an oscillocope.
- Just enter 0 MHz in the span frequency box
- Click twice on a given frequency, so that Marker 1 and Marker 2 have the same frequency value. Now select MARKER in the "Frequency Preset" group
- Doing so has allowed me to learn a lot about Zero Span in spectrum analysers!
- I consider that the VMA Simple Spectrum Analyser software is a great learning tool: if you learn how to use it, you will be able to use a regular spectrum analyser, so it does make sense to add this function, even if it's implementation doesn't allow a practical use.
- If future hardware devices of this family support a higher sampling rate, this function may become more useful.
- While the sampling rate is definitly insufficient to look for instance at analogue TV scanlines (a single scanline only takes 64us!), there might be other applications where the current sampling rate is actually enough (if so, please let me know).
- The Signal Source tab has now programmable preset buttons!
- The frequency input is now verified - if you enter a frequency which is out of range or doesn't make sense, it will be ignored, instead of crashing/freezing the software.