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

[Matt Ettus]

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
> <address@hidden <mailto:address@hidden>> wrote:
>
>     On Wed, Jan 27, 2010 at 8:52 PM, Ian Holland
>     <address@hidden <mailto:address@hidden>>
>     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:address@hidden
>     <mailto:address@hidden>]
>      >Sent: Thursday, 28 January 2010 3:29 PM
>      >To: Ian Holland
>      >Cc: address@hidden <mailto:address@hidden>
>      >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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