Re: [Discuss-gnuradio] Difference in Spectrum Analysis between Wx and Qt?

[CEL]

Hi Martijn,

Can you please use a file sink to record the signal, so that you can
verify that it's different when visualized with Qt and Wx?

Because: there might be a scaling difference between Qt and Wx GUI, but
the math should really be the same inside. I'd hence assume that
there's really a different signal causing the different pictures.

Just to pull one tooth right away: staying with WX will force you to
stay on GNU Radio release 3.7 forever, and within that, using a
component that nobody in the GNU Radio developer community knows how to
maintain. So, I'd still really recommend moving away from WX.

Best regards,
Marcus

On Mon, 2019-06-24 at 12:04 +0000, Martijn Scale wrote:
> I’m using GNU Radio v 3.7.11 on Windows 10, 1903 with Intel i5-3550 CPU and 
> on Linux Ubuntu 18.04, with i7-3720 CPU. Both have 16GB mem.
> Further, I have connected a HackRF One with firmware 2017.02.1. To the HackRF 
> One I have connected a Siglent SDG1025 Waveform generator, with external GPS 
> disciplined oscillator. I used a DC blocker and 30 db attenuation between de 
> generator and the HackRF One.
>  
> The waveform generator generates a sinewave of 9.76 MHz, I have setup GNU 
> Radio with a osmocom Source with 2M sps and Frequency of 10.3 MHz.
> To the osmocom Source I have connected first a QT GUI Frequency Sink.
>  
> To my surprise I see an AM modulated signal of around 70 kHz on the 9.76 Mhz 
> carrier. I have tried many things, removed the external oscillator and used 
> the internal one, tried a different waveform generator (HP33120A), but same 
> result, on both machines.
>  
> Today by coincidence I found that there is NO AM modulated signal when using 
> WX GUI and the WX GUI FFT Sink.
>  
> Anyone any thoughts on this? Qt will prevail over Wx in the future, but for 
> me this is unexpected behavior and I would like to stick to Wx.
>  
> 
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