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Leif Asbrink leif at sm5bsz.comOn Wed, 14 Aug 2013 19:55:03 -0700 (PDT) m240zz at gmail.com wrote: > The thing that confuses me is why is it during the sweeps due the fft look > so different in each of the windows and it seems like the timing of the > sweeps are different. The sweeps happen at the same time for each dongle, > right? The dongles are all listening in parallel at the same time? If > so, seems like they would look more alike at the same time. My apologies > for the density on this end. The purpose of the vido was to demonstrate that dongles are different. The sweeps indeed happen at the same time for all the dongles. The very point is that they do not look very much alike. It is non-trivial to know in advance which one will perform best in a real life situation. It was the first video. It just shows that dongles are (very) different. I am uploading some more videos as a response to the feedback I received so far. (Upload is extremely slow from here...) It would be trivial, but it would take a lot of time, to use a dongle to provide a wideband map from 50 to 500 MHz or whatever on a particular antenna in a particular location. With that knowledge it would be easier to decide what dongle to choose for a particular situation. It is trivial to add a selective filter and that can make a big difference for the dongles. 73 Leif