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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: |
Thu, 3 Jul 2008 20:58:54 -0700 |
User-agent: |
Mutt/1.5.17 (2007-11-01) |
On Fri, Jul 04, 2008 at 12:21:25PM +1000, Phaysal Khan wrote:
> Hi List,I am using an RFX2400 d'board, for IF sampling a signal
> which is 20MHz wide, centered at 2.4125GHz. I know it's not possible
> to sample whole 20Meg, but I am happy with a 16MHz version at this
> stage (which we belive is the widest we can go). I am using
> python usrp_rx_cfile.py -f 2404.5M -s --no-hb -8 -N 40000 data1.dat
I'm pretty sure that the 8-bit support is still missing from the FPGA.
Until somebody fixes that, the highest rate you'll be able to run at
is 8MS/s complex. That's what you'll get with -d 8.
> 1. Am I correct in using 2404.5M to downconvert the IF signal at
> 10MHz? I need "real" IF samples at 10MHz, do I need to change
> something here?
You set the frequency that you want to appear at DC in the complex
baseband.
> 2. this frequency in the above command is LO frequency or incoming
> signal frequency?
The -f <freq> argument is the RF frequency that you want to appear at
zero in the complex baseband.
> 3. My signal is in the range 2402.5-2422.5MHz range, which is well
> with in defined range of RFX2400 (2.4-2.483GHz), do I still need to
> cut lines for ISM filter on-board, as one of my project mates was
> advised to do. If yes, can't I use the other signal input on the
> board, which hasn't got any filter around it?
> 4. when I look at the spectrum of the IF samples collected using
> above command, they appear to have lesser bandwidth (4MHz) than the
> expected bandwidth(20MHz).
With -d 8 you'll get 64M/8 = 8MS/s complex. That'll be +/- 4MHz.
> Sorry if any/all of these questions sound stupid, but consider me
> novice :S
Welcome!
Eric
- [Discuss-gnuradio] IF sampling in ISM band, Phaysal Khan, 2008/07/03
- Re: [Discuss-gnuradio] IF sampling in ISM band,
Eric Blossom <=
- Re: [Discuss-gnuradio] IF sampling in ISM band, Johnathan Corgan, 2008/07/04
- RE: [Discuss-gnuradio] IF sampling in ISM band, Phaysal Khan, 2008/07/04
- Re: [Discuss-gnuradio] IF sampling in ISM band, Eric Blossom, 2008/07/04
- RE: [Discuss-gnuradio] IF sampling in ISM band, Phaysal Khan, 2008/07/06
- RE: [Discuss-gnuradio] IF sampling in ISM band, Phaysal Khan, 2008/07/07
- Re: [Discuss-gnuradio] IF sampling in ISM band, Eric Blossom, 2008/07/07
- Re: [Discuss-gnuradio] IF sampling in ISM band, Eric Blossom, 2008/07/07