Re: [Discuss-gnuradio] static peaks spectrum

[Cinaed Simson]

On 01/18/2017 01:31 PM, Marc Pàmies Massip wrote:
> Hi,
> 
> Maybe this is a stupid question for experts in SDR, but I haven't find a
> clear explanation yet. I know it is normal to have a DC offset in the
> center of the spectrum, but I am surprised by the amount of static peaks
> that I see sometimes in specific bands (you can find attached some
> images to better understand what am I talking about). It is obvious that
> those are not "real" signals, in fact when I re-tune the SDR peripheral
> they don't move according to the frequency displacement. I want to
> understand if it is due to a software problem (the screenshots were
> taken from SDR#) or if it has something to do with the hardware (maybe
> those are just harmonics from some kind of square signal, i.e clock). I
> am worried because they are extremely strong and because of this I could
> have trouble detecting weaker signals nearby.
> 
> Summarising, my questions are:
> 
> - What causes those peaks?
> - Is it necessary to remove them for a proper signal detection?
> 
> Thanks in advance,
> 
> Marc.

You haven't indicated what hardware you used or the sampling rate.

Try reducing the sampling rate - the sampling rate used may be unstable.

> 
> 
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