GaryParticipantGary November 26, 2022 at 12:23 pm
Don’t know how long its been in Spike, but I recently discovered the “Waterfall Spectrum View”. It’s AWESOME! A hearty well-done whoever put together that feature! It’s now become my number one go-to when I switch to zero span in Spike. I’ve used it to look at the spectra of individual Mode A/C/S & ADS-B bursts at 1090 MHz, demonstrate FM and FSK, and understand ramp up, sync, and ramp down in burst transmissions.
Again, excellent!Andrew November 28, 2022 at 8:18 am
Thanks for the feedback Gary, glad you’re liking it! I think it’s our RF engineers favorite view as well.
Andy LevissParticipantAndy Leviss January 31, 2023 at 12:12 pm
Where is the waterfall view tucked away? I have seen screenshots of it from a BB60C in the past, but I have yet to figure out where to switch to it from the flat spectogram view. Am I missing something obvious?Andrew January 31, 2023 at 12:17 pm
Gary was referring to the waterfall view in zero-span mode. Once in zero-span mode use the “Add Measurement” button in the upper left of the application to add a water fall plot. It shows you a very dense spectrogram plot over the duration of the time domain capture, usually overlapping FFTs by 90% or more depending on settings.
In sweep mode, it’s just a matter of clicking the “spectrogram” checkbox in the upper left as well. Same general functionality, less overlap between lines in the plot as compared to zero-span.
Speaking of which, maybe we should be a bit more consistent in our naming.
All of our waterfall/spectrogram views are “flat” 2D plots, if that is what you were referring to.
Let me know if you have more questions.
Andy LevissParticipantAndy Leviss January 31, 2023 at 12:46 pm
Thanks, Andrew. I’ve definitely seen screenshots of 3D waterfalls from Spike, is that not a thing anymore?
(See, for example, Jason Glass’s screenshot and video capture at the top of http://www.plsystem.com/pl_spectrum-page.htm – I know you can basically see the same wiggly modulation in a 2D spectrogram, but it’s a lot easier to visualize what it’s doing through time in that 3D graph, in my opinion. Might just be the way my brain is wired, though…)Andrew January 31, 2023 at 1:49 pm
The 3D waterfall was removed in 2017. We decided to add more features to the 2D waterfall instead of supporting both moving forward.
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