Re: [Discuss-gnuradio] UHD on USRP N210 + WBX

[Josh Blum]

On 09/16/2011 11:06 PM, address@hidden wrote:
> 
> Hi, all
> 
> I want to use UHD on USRP N210 + WBX.
> 
> 
> case 1:
> 
>  I try to use "uhd_fft.py".
> 
>  USRP2 (+ WBX) transmit signal by "benchmark_tx.py",
>  and USRP N210 (+ WBX) receive signal by uhd_fft.py.
>  But N210 could not receive the signal.
> 

Is the correct antenna selected?

Can you verify the transmitted signal?

> 
> case 2:
> 
>  I try to use "share/uhd/examples/tx_samples_from_file".
> 
>  Exec this command.
>   $ sudo ./tx_samples_to_file --file /file-path --freq 477e6 --rate 1e6
> 

Why use sudo?

>  But program finish after return this message
> 
>    Error: RuntimeError:
>    Please update the firmware and FPGA images for your device.
>    See the application notes for USRP2/N-Series for instructions.
>    Expected FPGA compatibility number 7, but got 6:
>    The FPGA build is not compatible with the host code build.
> 
>  I think that I use latest version.
> 
> 

The FPGA does not match the library version.

>  BUT, I could use "share/uhd/examples/tx_waveforms"
> 

You have multiple versions of libuhd. You should pick 1.

>  When I try "tx_waveforms", usrp2_fft.py on USRP2 receive signals.
>  I can see the signal on screen.
> 
> 
>  Why I could not use "tx_samples_from_file"??
> 
> 
> 
> case 3:
> 
>  I think that "tx_samples_from_file" is transmit an unmodulated signal.

The file represents baseband samples.

>  I want to transmit an modulated ( by gmsk, dqpsk, dbpsk) signal.
> 

Cool.

>  I want to use programs on USRP N210 + WBX,
>  that is similar to gnuradio/examples/digital/benchmark_tx/rx.py.
> 
>  Does anyone have sample program??
> 
> 

There have been some uhd ports of benchmark example apps on the list.
Tom has the new official ones here, but i think you need to install his
gr-digital branch to use:

https://github.com/trondeau/gnuradio/tree/digital/gr-digital/examples

I highly recommend experimenting with gnuradio companion first.

-josh