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| resources:tools-software:linux-software:spectrum_analyzer_plugin [12 Jan 2016 23:12] – add some details Robin Getz | resources:tools-software:linux-software:spectrum_analyzer_plugin [20 Jan 2016 08:18] (current) – [Issues] Robin Getz | ||
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| * Minimum signal detection time - This is related to the sampling rate of the converter and the FFT rate. Since we are doing FFTs in software, they are pretty slow (relatively). Since the LO is sweeping, if the frequency of interest is hopping, it needs to remain at one place for some duration, so it can be captured and displayed. | * Minimum signal detection time - This is related to the sampling rate of the converter and the FFT rate. Since we are doing FFTs in software, they are pretty slow (relatively). Since the LO is sweeping, if the frequency of interest is hopping, it needs to remain at one place for some duration, so it can be captured and displayed. | ||
| * Blind time: On traditional spectrum analyzers, they are able to sample the incoming RF spectrum in the time domain and convert the information to the frequency domain using the FFT process. Since we capture, and then convert, we do have times we are not capturing - and we can miss information. | * Blind time: On traditional spectrum analyzers, they are able to sample the incoming RF spectrum in the time domain and convert the information to the frequency domain using the FFT process. Since we capture, and then convert, we do have times we are not capturing - and we can miss information. | ||
| + | * DC correction: The AD9361 will remove signals which are exactly at the LO frequency - so you may miss something if it is very narrow band, at the LO. This is normally solved by shifting the LO a tiny bit (few Hz) on different sweeps. | ||
| ===== Spectrum Analyzer Controls ===== | ===== Spectrum Analyzer Controls ===== | ||
resources/tools-software/linux-software/spectrum_analyzer_plugin.txt · Last modified: 20 Jan 2016 08:18 by Robin Getz