Re: [Discuss-gnuradio] USRP Output to Spectrum Analyzer

[CEL]

Hello Yeo Jin Kuang Alvin,

that's probably because your Spectrum Analyzer has a sweep rate, and
you get something like a reduced probability of seeing the sweep at
all.
I think it's very likely you should read a tutorial on what a spectrum
analyzer is, and what the various settings on it mean, until you can
expect to observe a sweep with it (hint: it's near impossible to see a
sweep as a sweep with a SA, unless that sweep is very slow).

Best regards,
Marcus

On Wed, 2018-05-09 at 09:24 +0000, Yeo Jin Kuang Alvin (IA) wrote:
> Hello,
>  
> I managed to get the waveform! Was due some misconfigurations with the RBW 
> and VBW on the Spectrum Analyzer.
>  
> However, may I know why is the waveform bandwidth reduced by a lot. I tried 
> to send a chirp with a bandwidth of 1MHz but when I transmit out, I got 50kHz 
> of BW. Is it due to some loss when transmitting?
>  
> Thank you in advanced!
>  
> From: Discuss-gnuradio [mailto:address@hidden On Behalf Of Ron Economos
> Sent: Wednesday, 9 May 2018 3:28 PM
> To: address@hidden
> Subject: Re: [Discuss-gnuradio] USRP Output to Spectrum Analyzer
>  
> Here's what I get from the flow graph below.
> 
> 
> 
> 
> 
> Ron
> 
> On 05/08/2018 10:28 PM, Yeo Jin Kuang Alvin (IA) wrote:
> > Hi all,
> >  
> > Theoretically, in frequency domain, the spectrum for SQUARE wave should be 
> > a SINC  and for the spectrum of RAMP wave should be decreasing with every 
> > odd harmonics. A question that I want to ask is, will I get to see these 
> > frequency spectrum in the Spectrum Analyzer after being transmitted out 
> > from the USRP B210? As I have tried to send a Square and a Ramp wave using 
> > GNU Radio Companion, I see the waveform I want in GNU Radio plot, but I 
> > don’t see any nice expected waveforms in the Spectrum Analyzer.
> >  
> > Is it because of the IQ Modulation in the AD9361 of the USRP B210 that 
> > causes me not seeing the expected results? Or is it because of some 
> > configurations not done properly? Hope to get a reply soon!
> >  
> > Thank you in advance!
> >  
> 
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