> Hello!
>
> I am working on a radio astronomy project with the Green Bank
> Observatory / NRAO Central Development Lab this summer, utilizing GNU
> Radio and an Ettus Research SDR, and I've got a question regarding how
> to collect metadata information from a filesink.
>
> I have attached the flowgraph I am using to this email. The project
> requires that I use two computers in tandem for data collection -- one
> is connected to the Ettus -- it is the TCP server, and sends an
> interleaved data stream to the TCP client flowgraph (attached) on the
> machine which will be storing the data. As you can see, I am saving
> integrated spectra to a file. My question is simply, how do I retrieve
> a time stamp corresponding to each spectra using the metadata time
> sink? I have been fiddling with this all afternoon attempting to get
> it to work properly, and I have been able to save data to a file, read
> out spectra (using attached Python program), and display header
> information using the command gr_read_file_metadata in the terminal,
> but this is just showing me a timestamp for the beginning of the data
> collection run, rather than showing me timestamps for each spectrum
> which is saved to file, and I am not sure how to implement this.
>
> Any advice would be much appreciated! If I can provide any more info
> about my system or what steps I have tried, please let me know. Thank
> you so much for your time -- have a good afternoon!
>
> Best,
> Ellie
So, another thing to keep in mind is that the TCP source/sink DO NOT
CARRY metadata tags--only the samples. So if you're relying on that,
it won't work.
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