Re: [casper] Availability of SNAP board for the Mauritius Deuterium Telescope

[Marcus D. Leech]

On 05/25/2018 11:28 AM, Vinand Prayag wrote:

Marcus:



Vinand

Yes, each station should normally have the same number of antennas which are dual pol. So each pol gets digitised and then we intend to just track a source in the main beam in the first instance, and then move to beam forming. We are still investigating the possibility of fewer channels per station but the maximum will be 48.

So, I just put together the attached simplified simulation in Gnu Radio. Which has 9 antenna inputs at 250ksps, having complex weights on each antenna input, followed by a 1024-bin FFT which is integrated and decimated down to 1 second updates.

  even use Gnu Radio to do it.

It consumes about 10% of my lowly 8-year-old laptop for 9 inputs. My guess is that if you could get all your samples coherently into a modern-but-not-expensive PC server-grade computer, you can do whatever beamforming you want at those sample rates, and perhaps

On Fri, May 25, 2018 at 7:23 PM Marcus D. Leech <mle...@ripnet.com <mailto:mle...@ripnet.com>> wrote:

    On 05/25/2018 11:01 AM, Vinand Prayag wrote:

    Yes, you are absolutely right. I have had numerous conversations
    with Prof Rogers about building a new Deuterium focused array in
    the Southern Hemisphere and we found out that the scientific
    contributions that the instrument would be extremely valuable.

    Vinand Prayag
    Research Assistant
    University of Mauritius

    So, when you say 48 channels, you're talking 48 sky channels
    rather than 48 spectral channels, and you want to beam-form like they
      do at Haystack?

    On Fri, May 25, 2018 at 5:36 PM Marcus D. Leech
    <mle...@ripnet.com <mailto:mle...@ripnet.com>> wrote:

        On 05/25/2018 09:24 AM, Vinand Prayag wrote:

        Hi,

        Please find attached the User Requirement. The bandwidth is
        actually only 250KHz

        Cheers,
        Vinand

        Are you envisaging an array, like the D1 telescope at Haystack?

        On Fri, May 25, 2018 at 5:20 PM Marcus D. Leech
        <mle...@ripnet.com <mailto:mle...@ripnet.com>> wrote:

            On 05/25/2018 07:28 AM, Vinand Prayag wrote:

            Hi all,

            We are looking at building a telescope in Mauritius
            which is called the Mauritius Deuterium Telescope, MDT
            for short. As the name suggests it is a Deuterium
            focused experiment. We have planned for a pathfinder
            station to be built for the end of this year and had in
            mind the SNAP boards for the digital back-end. We were
            set to buy four SNAPs by the end of next month but a
            sudden slash in funding has put a dent in our plans. I
            was wondering if anyone has any unused SNAPs that we
            can get off their hands at a reduced price. Currently
            one SNAP is sitting at $3500 from Digicom. Anything
            below $3000 will greatly help us. We will obviously be
            extremely grateful for donations. Hope to have some
            positive feedback from some of you.


            Kind Regards,
            Vinand Prayag

            Do you have a pointer to a project description?

            Why such high bandwidth if you're looking at Deuterium?




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beamformer.grc
Description: application/gnuradio-grc