Re: [Discuss-gnuradio] N210 XCVR2450

[Nick Foster]

On Wed, 2011-08-03 at 22:09 +0300, Burak Kelleci wrote:
> Hi,
> 
> I have replaced XCVR2450 with LFTX and checked the output using an 
> oscilloscope. I have applied an AM signal with 100KHz carrier frequency and 
> 10KHz message signal frequency. I selected the amplitudes so that total 
> signal amplitude is always less than 1. Sampling frequency is selected as 
> 1MHz. For 003.002.000 release the output is not as expected. However, for 
> 003.002.001 release the output matches to the expected waveform. However, 
> XCVR2450 did not work with 003.002.001 release. I attached the error. I also 
> tried to recompile and reinstall UHD and gnuradio. Unfortunately the result 
> is the same.
> Any suggestions?

OK, I know the problem now. There was a timing bug in the 3.2.0 FPGA
image release that affected some N210 users. The issue has been resolved
in 3.2.1. 

Like Josh says, the error you are seeing indicates that there are
multiple copies of the UHD host library on your machine, or you haven't
built the corresponding 3.2.1 host code yet.

--n

> 
> Burak Kelleci
> 
> 
> -----Original Message-----
> From: Nick Foster [mailto:address@hidden 
> Sent: Friday, July 29, 2011 7:59 PM
> To: Burak Kelleci
> Cc: address@hidden
> Subject: Re: [Discuss-gnuradio] N210 XCVR2450
> 
> On Fri, 2011-07-29 at 19:40 +0300, Burak Kelleci wrote:
> > Hi,
> > 
> > I am trying to send data from a N210+XCVR2450 to another N210+XCVR2450.
> > Both equipment have antennas connected at J2 antenna input and they are
> > connected to the same computer using 2 gigabit ethernet ports. I have
> > assigned different ip addresses and executing "uhd_find_devices" gives the
> > following result
> > 
> > --------------------------------------------------
> > -- UHD Device 0
> > --------------------------------------------------
> > Device Address:
> >     type: usrp2
> >     addr: 192.168.20.2
> >     name: 
> >     serial: E2R12XEUP
> > 
> > 
> > --------------------------------------------------
> > -- UHD Device 1
> > --------------------------------------------------
> > Device Address:
> >     type: usrp2
> >     addr: 192.168.10.2
> >     name: 
> >     serial: E3R12X7UP
> > 
> > Executing uhd_usrp_probe --args=addr=192.168.10.2 gives
> 
> <snip>
> 
> > 
> > Both devices have UHD-images-003.002.000 fw and fpga built. I have tried
> > usrp_n210_r4_fpga.bin and usrp_n210_r2_fpga.bin FPGA images. They both give
> > similar performances. Couple of days ago I have compiled UHD and gnuradio
> > after I get the latest version from git repository.
> 
> First, don't upload r4 images to your N210. Use the version that
> corresponds to the sticker on the back of your N210, which is R2 since
> we haven't actually shipped any rev 4 units yet. Using rev 4 FPGA images
> on your rev 2 N210 will result in transmitting and receiving nothing but
> zero samples.
> 
> Other than that, your flowgraph looks OK and you should see something on
> your receiver spectrum.
> 
> --n
> 
> > 
> > Since I don,t have a spectrum analyzer, I can not check the output of TX.
> > Both devices are tuned to the same frequency I am expecting to get some
> > signal at the RX. Till now I have received only noise.
> > 
> > There is a 2.4GHz WLAN in the building and I tried to capture WLAN signals
> > using uhd_fft.py but this also failed.
> > 
> > I have attached gnuradio-companion file that I used and screen captures.
> > 
> > Is there anything I am missing? Any suggestions?
> > 
> > Regards,
> > 
> > Burak Kelleci
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > address@hidden
> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
>