[Pafgbt] PAF/GBT code

[Rick Fisher]

Hi Richard,

Thanks very much.  Now that you point it out, I'm probably closer to 
having all of the information I need than I realized.

Rick

On Wed, 5 Dec 2012, Richard Black wrote:

> Dr. Fisher,
> I designed section 4.3 to describe all the commands that would be used by
> the M&C system to control the DAQ. However, I would take those descriptions
> with a grain of salt; I just realized that additional information will be
> needed. Hopefully the DAQ's command descriptions will be finished by the end
> of the week; I need to finalize the specifications with Dr. Jeffs and Dr.
> Warnick tomorrow.
> 
> Regarding the correlator mode, that's been sitting in a code freeze for a
> month or so.  We'll pull it out and dust it off and get back to you. Last I
> checked, we had the correlator working for 32 elements, but this hasn't been
> formally verified yet.
> 
> We've been working on a single system. If there's anything else about the
> system that I can inform you about, feel free to let me know.
> 
> Thanks,
> 
> Richard Black
> 
> 
> On Wed, Dec 5, 2012 at 1:07 PM, Rick Fisher <rfisher at nrao.edu> wrote:
>       Hi Richard,
>
>       It's been awhile since we last communicated on PAF/DAQ so just
>       thought I'd
>       touch base to take stock.  Aside from a question on whether the
>       DC channel
>       was counted in the spectral channel count, I think we had pretty
>       well
>       converged on my understanding of the streaming data packet
>       format.  I've
>       started rounding up some code to write a data display for this
>       format
>       that might help with data integrity checks at the beginning of a
>       data
>       acquisition session.
>
>       It looks like section 4.3 of your documentation spells out what
>       we need to
>       control the streaming mode.  That will be next on our TODO list
>       and will
>       be the beginning of writing the "Modification Request" that we
>       need to
>       provide to the GBT control system programmers.
>
>       I think that your data acquisition mode of greatest interest for
>       tests of
>       the beamforming array on the telescope will be the Correlator.
>        Data from
>       this mode allows us to calibrate the array and gives us the most
>       information about array performance and anomalies.  How far
>       along are you
>       in bench testing and documentation of this mode?  When you have
>       some
>       sample data from the correlator we can start writing a software
>       reader on
>       our end.  The streaming data sample that you provided was really
>       instructive.
>
>       Dr. Jeffs may have told me this and I've since forgotten, but
>       are you
>       building two copies of the data acquisition hardware (one for
>       development
>       and one to go to either Green Bank or Arecibo as needed) or just
>       one?
>       Quite some time ago we received a list of components that went
>       into your
>       system, but we haven't thought much more about whether we should
>       invest in
>       a copy of this hardware.  We should give this more thought now
>       that it's
>       clearer who is available here to work on that part of the
>       project.
>
>       Best regards,
>       Rick
>
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> 
> 
>