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Re: [Discuss-gnuradio] USRP DDC and GNURadio Bandwidth Problem
From: |
CEL |
Subject: |
Re: [Discuss-gnuradio] USRP DDC and GNURadio Bandwidth Problem |
Date: |
Mon, 14 May 2018 07:54:46 +0000 |
Hi Ali,
just like the console will tell you, 25 kS/s is simply impossible with
an X310; instead, the minimum possible rate was used.
You should probably just configure your X310 to get you e.g. 500 kS/s,
and then resample in digital domain. If you're hesitant to design your
own decimating filter, use the "rational resampler" block and configure
it to decimate by (500/25)=20.
Best regards,
Marcus
On Mon, 2018-05-14 at 10:18 +0300, Ali wrote:
> Hi to all,
>
> I am using GNURadio to control an X310. I want to get IQ samples for only 25
> kHz bandwidth.
>
> When I wrote 25 kHz to the bandwidth line in UHD-Source block in GNURadio, I
> still see the signals at 50 kHz or 75 kHz away from the center. My sampling
> rate is 195312 Hz. When checked in MATLAB, the signals are there. It looks
> like I cannot control the bandwidth with GNURadio.
>
> I suspected that there is not any DDC filter for this bandwidth. If it is so,
> what is the minimum bandwidth for USRPs? Are the bandwidths that I can use
> discrete? I am confused.
>
> Thanks in advance,
> Ali
>
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