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Re: [Discuss-gnuradio] N210 XCVR2450

From: Burak Kelleci
Subject: Re: [Discuss-gnuradio] N210 XCVR2450
Date: Wed, 3 Aug 2011 22:09:09 +0300


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?

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:
>     name: 
>     serial: E2R12XEUP
> --------------------------------------------------
> -- UHD Device 1
> --------------------------------------------------
> Device Address:
>     type: usrp2
>     addr:
>     name: 
>     serial: E3R12X7UP
> Executing uhd_usrp_probe --args=addr= gives


> 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.


> 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

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