Re: [Discuss-gnuradio] Unable to tune Tx or Rx with XCVR2450 on USRP2

The -f argument to usrp2_fft.py is the frequency. By putting "-f 1000"
you are telling the system to try to tune the xcvr2450 to 1 kHz. The
specified range is 2.4-2.5 GHz and 4.9 to 5.9 GHz. 1 kHz is WAY outside
of that range. I would suggest you try something like:

usrp2_fft.py -f 5.7G

Matt

On 01/28/2010 05:35 PM, Manav Seth wrote:
> Actually no...its always returning false...
> when I use usrp2_fft.py with -f 1000 then output does come but still it
> is unable to set the initial frequency though it did receive.
>
> I am still trying to figure out the problem...
>
> On Thu, Jan 28, 2010 at 3:43 PM, Ian Holland
> <Ian.Holland@rlmgroup.com.au <mailto:Ian.Holland@rlmgroup.com.au>> wrote:
>
> On Wed, Jan 27, 2010 at 8:52 PM, Ian Holland
> <Ian.Holland@rlmgroup.com.au <mailto:Ian.Holland@rlmgroup.com.au>>
> wrote:
> Hi All
>
> I have been trying to set the Tx and Rx frequencies when using an
> XCVR2450 with a USRP2, but it seems these keep failing. A snippet of my
> source code is below for setting the Tx frequency.
> The output of this portion of code is "Failed to tune Tx", and the
> frequencies are all 0, with spectrum_inverted being false.
> I have also tried to use usrp2_fft.py, and this fails saying nothing is
> received on channel 0.
> Does anyone know what the problem could be?
>
> Thanks
>
> Ian.
>
> /* try tuning Tx to a test frequency */
> double Fc = 2400000000.0;
> usrp2::tune_result TxTuneResult;
> bool successTx = device->set_tx_center_freq(Fc,
> &TxTuneResult);
> if(successTx) {
> cout << "Tx Tune Successful:\n";
> cout << " Baseband Frequency: " <<
> TxTuneResult.baseband_freq << "\n";
> cout << " DxC Frequency: " <<
> TxTuneResult.dxc_freq << "\n";
> cout << " Residual Frequency: " <<
> TxTuneResult.residual_freq << "\n";
> cout << " Spectrum Inverted: " <<
> (TxTuneResult.spectrum_inverted ? "true" : "false") << "\n";
> }
> else {
> cout << "Failed to tune Tx.\n";
> cout << " Baseband Frequency: " <<
> TxTuneResult.baseband_freq << "\n";
> cout << " DxC Frequency: " <<
> TxTuneResult.dxc_freq << "\n";
> cout << " Residual Frequency: " <<
> TxTuneResult.residual_freq << "\n";
> cout << " Spectrum Inverted: " <<
> (TxTuneResult.spectrum_inverted ? "true" : "false") << "\n";
> }
> cout << "\n";
>
> _______________________________________________
>
> >From: Manav Seth [mailto:smartymanav@gmail.com
> <mailto:smartymanav@gmail.com>]
> >Sent: Thursday, 28 January 2010 3:29 PM
> >To: Ian Holland
> >Cc: discuss-gnuradio@gnu.org <mailto:discuss-gnuradio@gnu.org>
> >Subject: Re: [Discuss-gnuradio] Unable to tune Tx or Rx with XCVR2450
> on >USRP2
>
> >Ya, its failing for me too...set_tx_center_freq is always failing
> (though I >am writing my code in python)..
> >not able to find the cause...
>
> Have you been able to get any of the pre-written scripts (e.g.
> usrp2_fft.py or usrp_siggen.py) working? I can't even get those to work.
> I tried usrp_siggen.py in verbose this morning and noticed again it was
> unable to set the Tx frequency. Also, I think the error I had mentioned
> above re usrp2_fft.py would be because the rx frequency couldn't be set.
>
> I have tried two of the daughtercards on one USRP2, and one of those two
> cards on the other USRP2, and still can't get it to set, though it
> worked fine using the same code for the BasicTx and BasicRx.
>
>
>
>
>
>
>
>
>
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