Re: [Discuss-gnuradio] Some help required piping samples to the USRP2/WBX

[Matt Ettus]

On 02/18/2010 08:06 AM, Charles Brain wrote:
> Hello,
>
> I am trying to write a python script which will allow me to take some 16
> bit IQ samples from a file and write them out to my USRP2/WBX.
>
> The background is that I am trying to implement what has been done on
> here http://www.m0dts.co.uk/datv_live.htm
>
> but instead taking the output of gbDVB piping it through
> an app I am writing (to do the raised cosine filtering) then piping that
> to the USRP2
>
> Unfortunately GnuRadio is a bit daunting at the moment
> especially finding what various things are especially as some usrp
> blocks don't seem to exist for the usrp2 or their input formats are
> different.
>
> What I need to do is set the tx frequency to 1249 MHz
> select the correct antenna output then pipe samples from
> the input file to the usrp2 sink.
>
> Any pointers would be most useful.
>
> Be gentle
>
> - Charles


Charles,

Glad to hear from you.  I would suggest that the easiest thing for you 
to do would be to build a flowgraph in GRC.  Assuming your file is 
binary, you can just use the file source and a USRP2 sink.

I've attached a sample flow graph.  I'm away from any hardware right now 
so I can't test it, but it is simple enough it should work.  You'll need 
to set the interpolation ratio based on the sample rate of your data.


Matt

send_shorts.grc
Description: application/gnuradio-grc