Re: [Discuss-gnuradio] Radio Astronomy GSoC 2017 group possible?

[Marcus D. Leech]

On 02/14/2017 09:22 AM, Glen I Langston wrote:
> Hi Marcus,
>
> Thanks again for pointing me at your spectro_radiometer.grc, a very amazing 
> creation.
>
> (https://github.com/ccera-astro)
>
> Your example is a valuable in showing the many different ways GNURadio blocks 
> can be connected
> by named Variables and Parameters.
>
> It appears that much of the magic is in the use of your Variable called 
> “fft_log_status”,
> which enables a complex call to your spectro_helper.py code, passing all your 
> sampled
> vectors.
>
> One question: Does this scheme create a separate thread that does the writing 
> of the
> sampled data (or does this run under thread doing other functions)?
>
> It seems that my humble goal of writing Astronomical format FITS files could be 
> achieved
> by writing code that performs a similar function to fft_log_status.
>
> Best regards,
>
> Glen
Every "function probe" runs in its own thread.

If you look at the helper code, there's a function called "fft_log", 
where the logging happens.  This is where you'd write out a FITs file.

I take ruthless advantage of the dependency evaluator in GRC to allow my 
own functions to get called on a regular basis, for various things,
  including low-rate data-logging in text format.

The way it works is that the FFT vector is connected both to a 
probe-vector block and a Qt Vector Display block, so the logger is "seeing"
  what the vector display is seeing, more-or-less.   The total power is 
calculated from the FFT vector, after applying an RFI mask.


> > On Feb 7, 2017, at 7:13 PM, Marcus D. Leech <address@hidden> wrote:
> >
> > On 02/07/2017 05:40 PM, Glen I Langston wrote:
> > > Hi Marcus,
> > >
> > > I just found the problem.  My device only has one channel.  I deleted
> > > all the 2nd channel stuff and the spectro_radiometer is working great.
> > >
> > > I’ve got to find where the data is going, but I like the many features you’ve
> > > added.
> > >
> > > Cheers
> > >
> > > Glen