Re: [Discuss-gnuradio] Problem in using connect(gr.file_source, usrp.sink_s)

[Eliane Hook]

Thanks for the responses.

I have used twice the interpolation number as the decimation number that is used to record or receive the data.

I did not understand this part:
"Secondly, there is likely frequency offset between your original
transmitter and the USRP on receive, as well as between the USRP on
transmit and whatever receiver you're using.  Depending on what the
modulation is you're dealing with, it might not survive these."

I am using RFX2400 daughetr boards and am using 2.4G to transmit and recieve on the 2 boards. I am using gmsk modulation scheme.

To answer this:
"Are you not receiving the data back, or are you receiving nothing at all
(power, distorted signal)? Is this a digital waveform? What are you
doing for frequency synchronization?"

I am not recieving the data back. I also used the oscope and checked the signal. It jus looks like noise but anything with gmsk modulation looked like noise to me.
I did not understand what is meant by frequency synchronization.

I really appreciate any help that I recieve.
Thanks!
--Eliane

On 7/17/07, Tom Rondeau <address@hidden> wrote:

Eliane Hook wrote:
> Thanks for the inputs. There was some issue with the hardware. I
> changed the USRP Board and this worked. But I still have a problem.
>
> This output.dat file is obtained by running the usrp_rx_cfile.py at a
> particular frequency that has some meaningful data being transmitted.
> So the I and Q data being captured by the usrp_rx_cfile has meaningful
> data. Now, when I run my current script that connects the file_source
> to usrp_sink at some particular frequency and I cannot recieve this
> data from another radio at the same frequency. Is this flawed
> conceptually?
>
> Thanks again for any and all help.
> -- Eliane

Are you not receiving the data back, or are you receiving nothing at all
(power, distorted signal)? Is this a digital waveform? What are you
doing for frequency synchronization?

Tom



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