Re: [Discuss-gnuradio] Problem with vrt code

[Josh Blum]

It looks like the trailer (which is zero) is being written into the 
file. The vrt::expanded_header::parse routine should be calculating the 
correct length from the header. This call can be found in the usrp2_impl.cc

I dont think the parser is wrong, nor do i think the 
rx_streaming_samples is getting the length wrong. You may want to check 
wireshark and verify what you are seeing over the wire.

-Josh

On 02/22/2010 08:24 AM, Per Zetterberg wrote:
> Hi All,
>
> I am transmitting using tx_samples and receiving with
> rx_streaming_samples. I use basic daughterboards. The signal transmitted
> is just a sequence of the value 10000+10000j. The carrier frequency is
> set to 10MHz. The interpolation/decimation rate is 64. The transmitter
> is repeating i.e. "-r" option is used.
>
> The plot http://www.s3.kth.se/~perz/usrp/p1.jpg shows the absolute value
> of the received data when the transmitter is using vrt code. The plot
> http://www.s3.kth.se/~perz/usrp/p2.jpg shows the received signal when
> the transmitter is using trunk code (checked out a few weeks ago). The
> receiver is using vrt code in both cases.
>
> The interval between the points where the signal disappears is
> suspiciously close to 371. I think I also observed this "signal loss"
> when looking at the signal output using oscilloscope (although it's an
> old analog scope and therefore difficult to say).
>
> BR/
> Per
>
>
>
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