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Re: [Discuss-gnuradio] IF sampling in ISM band
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] IF sampling in ISM band |
Date: |
Mon, 7 Jul 2008 17:27:40 -0700 |
User-agent: |
Mutt/1.5.17 (2007-11-01) |
On Tue, Jul 08, 2008 at 10:16:53AM +1000, Phaysal Khan wrote:
>
> Hi List,
> Just re-stating the issues I am having with capturing IF samples of an RF
> signal: I am trying to sample a 16MHz wide spectral content from a signal,
> originally centered at 2.414 GHz. I am using RFX2400, gnuradio 3.1.2 and
> using following command:
>
> python usrp_rx_cfile.py -f 2404.5M -s --no-hb -8 -N 40000 data1.dat
> using "-f 2404.5M" to get IF (downconverted) signal centered at 10MHz.
> using "-s --no-hb -8" to be able to capture 16MHz wide bandwidth.
> I am having following issues:
> 1. I am getting a downconverted signal centered at zero freq and not at 10MHz
> which I expected.
> 2. I can see downconverted signal's spectrum to be only +/-4MHz wide, and not
> +/-8MHz.
In the trunk (sorry, I didn't take time to build 3.1.2), when I do
this, I see 16MHz of spectrum:
address@hidden ~]$ usrp_fft.py -8 -f 92.1 -d 4
How do you _know_ you're not getting +/- 8MHz?
How wide is the signal that you want offset by 10MHz?
Eric
16MHz-wide-fft.png
Description: PNG image