[Discuss-gnuradio] Help: Switching usrp to capture different frequencies alternately using python thread.

[ton ph]

Hi everyone ,
 I have been trying an experiment in trying to capture different frequencies using python thread to alternately capture different frequencies.
what i am trying is like this [ pseudo code ].
  #freq_list = [ '222','787']
  1: capture 222  using usrp_rx_cfile.py...  by supplying freq  = 222 to usrp_rx_cfile.py  
  2: wait for 2 min and let frequency 222 to be used for capturing data
  3; Now switch to frequency 787 and start capturing data, by simply changing the frequency parameter to usrp_rx_cfile.py
  4 .... and the loop goes on.

I am using python thread to switch the frequencies to usrp_rx_cfile.py.

But i am not able to get the required output... can someone help me in explaining how does usrp reacts when a frequency is fed to usrp_rx_cfile.py  
to capture data.I am confused why my experiment is not working.
Please tolerate me if i have post with mistakes...

Thanks

On Mon, Sep 13, 2010 at 9:30 PM, <address@hidden> wrote:

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Today's Topics:

  1. USRP2, FPGA speed grade (Malihe Ahmadi)
  2. Re: USRP2, FPGA speed grade (Josh Blum)
  3. sync_and_start_rx_streaming_at (David Campbell)


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Message: 1
Date: Sun, 12 Sep 2010 13:03:03 -0600
From: Malihe Ahmadi <address@hidden>
Subject: [Discuss-gnuradio] USRP2, FPGA speed grade
To: address@hidden
Message-ID: <address@hidden>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Hi,

what is the speed grade of XC3S2000 FPGA on USRP2 board?

Thanks,
Malihe



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Message: 2
Date: Sun, 12 Sep 2010 12:18:29 -0700
From: Josh Blum <address@hidden>
Subject: Re: [Discuss-gnuradio] USRP2, FPGA speed grade
To: address@hidden
Message-ID: <address@hidden>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

all project properties can be found here:

http://ettus-apps.sourcerepo.com/redmine/ettus/projects/uhd/repository/revisions/master/entry/fpga/usrp2/top/u2_rev3/Makefile.udp

On 09/12/2010 12:03 PM, Malihe Ahmadi wrote:
> Hi,
>
> what is the speed grade of XC3S2000 FPGA on USRP2 board?
>
> Thanks,
> Malihe
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio



------------------------------

Message: 3
Date: Sun, 12 Sep 2010 14:41:53 -0700 (PDT)
From: David Campbell <address@hidden>
Subject: [Discuss-gnuradio] sync_and_start_rx_streaming_at
To: address@hidden
Message-ID: <address@hidden>
Content-Type: text/plain; charset=us-ascii

Hi All,
 I have an issue with the pps syncing on the USRP2.  If I  call
sync_and_start_rx_streaming_at(0,0,0)  then the function call  will complete
about 1 out of 15 tries (so it just hangs in that call  most of the time).
I've

looked at my pps signal going into the  USRP2 and it is exactly what is
required.  When the call does run to  completion and data starts streaming it
looks like the timestamp  counter is being set properly (i.e. set to 1) .  Has
anyone run into  this problem?  I've experienced this on multiple USRP2s.

  Thanks,
David



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