Use "spectrum analyzer" tool for time-varying signal captured via an SDR device

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Dear all
I am intested in plotting the full frequency content of a signal captured by using an SDR device. The sample recording process consists of sequential tuning of the device to adjacent frequencies, fc, and storing a certain fixed amount of samples, N, at each tune, with a bandwidth dictated by the sampling frequency, fs. Sometimes, the acquiring filter has a bandwidth a bit smaller than that given by the sampling frequency, so some degree of overlap is also considered.
What I want to know is whether the spectrum analyzer DSP app can be used to plot the entire spectrum at once. For now, I have not been able to hold one representation when trying to plot the next. I mean, the app "refreshes" the plot every so often, and if I try to add frequency content at higher frequencies, I get the previous erased. I've also tried to consider each set of samples a different "channel" for the app, but I do not like the different color representation of each segment.
Is there any way of using the spectrum analyzer app for this purpose? I know I can do it on my own, calculating FFTs of segments, etc, and I have tried. But I believe I might have done something wrong, since I get strange outputs sometimes, and would like to compare with the plot of the app.

Respuestas (1)

Ben Cunningham
Ben Cunningham el 25 de Mzo. de 2022
Hi Toni,
The example shifts each channel so that they display in the correct position in the spectrum analyser.

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