Re: [Discuss-gnuradio] gr-usrp library

[Ges]

Hi Eric,

I tried using the gnuradio blocks in gmsk (the old python script : gmsk-test.py) and sending a file across from one usrp (using the basic daughter cards) to the other using SMA cable - the same connection setup I had mentioned earlier. 

I am simply modulating a char stream using the blocks in gmsk-test.py and sending it out using usrp_sink and using usrp_source to receive and then demodualting using the blocks in gmsk-test.py and dumping to a file. 

I am not sure what is happening, but the general_work() of the simple_correlator() simply returns 'zero'. And hence I have no output in the file_sink(). I have set a tx freq of 29.32e6 and a rx freq of the same value. I had tried with a gain of 0 on both sides n then with a gain of 20. But the results seem to be the same....

Is it because of the simple_correlator() or is somehting else possibly going wrong? Please help....

I will be trying out the new blocks in the gmsk2
 implementation. I did not want to do a CVS update due to some other issues. I guess I will grab those blocks and recompile gnuradio-core. 

Thanks a lot

-Gesly


Eric Blossom <address@hidden> wrote:
>  On Sat, Mar 25, 2006 at 11:15:36AM -0800, Ges wrote:
> > Oh k...
> > 
>
> > I am not using the Flex boards. What do you recommend for using with
> > the basic daughter cards - for sending from one board to the other
> > over an SMA cable? Right now I have connected the TX_A port (board 1
> > daughter card) to the RX_A port (board 2 daughter card). Will the
> > default frequency values work right?
>
> I think that benchmark_gmsk_tx and rx will work with the Basic Tx/Rx.
> Use a frequency in the neighborhood of 29MHz, and still use a piece of
> wire as an antenna on each.  Note that you have
>  zero filtering on
> either the transmit or receive path, and that this will be spraying RF
> all over the spectrum.  Definitely not good practice.
>
> > I hope to see something go across from one board to the other and
> > then will try to use those blocks in Click.
>
> You'll have much better luck using either the Flex 400 or Flex 2400 boards.
>
> Are you still trying to glue click and GNU Radio together in the same
> address space?  If so, why?  What's the advantage over using some
> standard IPC mechanism between the two?
>
> Eric

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