Hi, Sorry, just realized that decreased bandwidth = decreased signal to noise. Had a memory slip on that one! But I am still interested in the main part of the question.
Thanks in advance! Ellie On Sat, Jul 15, 2017 at 11:13 AM, Ellie White <elliewhite1...@gmail.com> wrote: > Hello! > > > > I have a quick question to ask, related to sampling rate and observed > frequency on the waterfall sink. I’ve been testing an antenna (connected to > an SDR dongle) with both GNU Radio and SDR#, and have noticed something > kind of odd. In SDR#, I can see some strong signals at ~125040 kHz (125 is > my LO frequency, so the actual signal is at 40 kHz). In GNU Radio, if I set > the sampling rate to 2M, everything matches up with the SDR# display, but > if I set it to a lower sampling rate, say 800k, the same strong signal > shows up at 125031 kHz. Why is that? > > > > The reason I would like to know is that I want to use a smaller bandwidth > for this flowgraph, to increase S/N. Is there a way to decrease sampling > rate – and thus bandwidth – without distorting the placement of the > signals? > > > > I’ve included my flowgraph, in case that would be of any use. Thanks so > much – have a good day! > > > > Ellie > > > > p.s. Hopefully this doesn’t post more than once – it wouldn’t deliver from > my other email address, so I sent it from this one. > > >
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