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resolution bandwidth of the windowed FFT result. Limited by the computing
power, RBW can only be set within a certain range under a certain sweeping
bandwidth. As for time-varying signals that are larger than the real-time
bandwidth, the amplitude on the splicing point could possibly leap due to the
fact that those two sides of the splicing point are sampled at different
moments. What's more, the shape of the signals could be quite different from
those in the conventional sweeping spectrometer. Take the spectrums of
modulated signals as an instance, what KC908 displays is the peak value (or
average value, according to the setting), without the "illusion", which is caused
by the concept of sweeping from left to right, that at any moment only one
frequency can be swept. For this reason, the experience of analysing signals
on a traditional spectrometer, which is mostly abstracted from those
"illusions", may not work anymore.
From another persepective, real-time spectrometer does not necessarily
represent the "truth". The fact is there is a limit for the time resolution. In
other words, even there is some sort of machine that are capable of achieving
10k FFT/s, no monitor can match this speed, let alone human eyes to catch up
with that monitor. It's believed that no matter what amount of data is to be
dealt with, there will always be some kind of method to abstract the essence in
it and present those essence within a budget of several dozens of data frames.
This process is known as "detection". The detection mode setting is to set the
rule to which the abstracting process is made according. Options are like
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