Re: [Discuss-gnuradio] N210 XCVR2450

[Burak Kelleci]

Hi,

Thanks for your help. Unfortunately, even after I have uploaded r2 FPGA code, I 
am not able to see anything on the spectrum. I have also tried to connect 
antennas directly to the sma connector on the XCVR2450 board. Both antennas are 
connected to J1 antenna port. I tried to send a modulated signal at 5.5GHz and 
detect it using uhd_fft.py But I haven't seen any tone at the spectrum. Could 
it be a hardware problem? Do you have any test programs that I can use to check 
the hardware?

Regards,

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
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