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

[Ian Holland]

Hi Matt

I have tried usrp2_fft.py -f 2.4G and also usrp2_fft.py -f 5.7G as you
suggest below. In both cases, the fft window opens but no trace is
displayed, and I see the following output in the terminal:

usrp2: channel 0 not receiving
usrp2::rx_sample() failed

I only recently received my USRP2s and XCVR2450s, which were shipped at
the end of December. Are there any known issues with the firmware on the
SD cards at this time, or do you have any other idea why I can't seem to
tune frequencies on these cards?

Thanks

Ian.

-----Original Message-----
From: Matt Ettus [mailto:address@hidden 
Sent: Friday, 29 January 2010 12:35 PM
To: Manav Seth
Cc: Ian Holland; address@hidden
Subject: 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
> <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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