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Re: Interesting SDR project funded by DARPA

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  • rlramirez77
    Yowsa that s a lot of processing in a small package Sid! Russ K0WFS (another IBM refugee)
    Message 1 of 36 , Oct 24, 2012
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      Yowsa that's a lot of processing in a small package Sid!

      Russ
      K0WFS
      (another IBM refugee)

      --- In softrock40@yahoogroups.com, Sid Boyce <sboyce@...> wrote:
      >
      > Another interesting project is parallela.
      > I subscribed $99.00 to the project last week. Details on adapteva.com.
      > http://www.adapteva.com/white-papers/sdr-and-cognitive-radio-on-parallella/
      > 73 ... Sid.
      >
      > On 23/10/12 23:07, m0fmt wrote:
      > >
      > > Hi all
      > >
      > > The 8 bit ADC seems to work ok on RX applications using the DVB-T USB
      > > stick with HDSDR application, subjectively. It is on the cusp with
      > > clarity of the waterfall presentation of cw but audibly it sounds
      > > fine. I up convert to HF (probably missing the point at this stage)and
      > > to see the whole HF spectrum as an endless ribon is a joy but with a
      > > 1meg screens worth of signals is impossible so you have to ride the
      > > zoom control. We are not talking TX here only RX.
      > >
      > > Will follow this thread with interest.
      > >
      > > 73 Pete m0fmt
      > >
      > > --- In softrock40@yahoogroups.com
      > > <mailto:softrock40%40yahoogroups.com>, Sylvain AZARIAN
      > > <sylvain.azarian@> wrote:
      > > >
      > > > Hi,
      > > >
      > > > Decimation sounds to be a good option but in fact it requires a huge
      > > amount
      > > > of processing to remove with enough attenuation unwanted signals
      > > (low-pass
      > > > filtering + decimation). It means having a long set of coefficients for
      > > > DSP, and this processing must be done at full speed (at the rate of the
      > > > incoming samples). This typically requires a carefully written code + a
      > > > multi core machine...
      > > >
      > > > The good thing is to be able to see the full band but... apart from
      > > the 350
      > > > Khz we have in the 20 meter band... (Ok, this could be useful for
      > > VHF/UHF
      > > > where the bands are not that busy (at least in france); but from my
      > > > personal experience, not very easy to identify a QSO on a 2MHz wide
      > > > waterfall...)
      > > >
      > > > 73
      > > > F4GKR
      > > >
      > > > 2012/10/23 David Turnbull <dturnbull@>
      > > >
      > > > > **
      > > > >
      > > > >
      > > > > Alex,
      > > > >
      > > > > I asked if hams would be interested and what I posted is the
      > > answer I got.
      > > > > The image is a problem in transmit because it's a spurious
      > > emission and in
      > > > > receive because, for example, a CW contest becomes a maddening
      > > problem. The
      > > > > dynamic range is also a problem as you describe but you can't get
      > > more with
      > > > > decimation trickery. Maybe someone will figure out some hardware hacks
      > > > > though.
      > > > >
      > > > > 73 David AE9RB
      > > > > http://AE9RB.com/
      > > > >
      > > > >
      > > > > On Mon, Oct 22, 2012 at 4:45 PM, Alex Turcu <talex004@> wrote:
      > > > >
      > > > >>
      > > > >>
      > > > >> David,
      > > > >> Wouldn't oversampling help in this case? Given the ADC can do
      > > > >> 8bit/20msps, wouldn't that be roughly equivalent to 16bit/78ksps
      > > ? Also,
      > > > >> shouldn't the problem be due to dynamic range, instead of image
      > > > >> rejection (stronger stations would make weaker stations inaudible,
      > > > >> regardless of where they are with respect to the center
      > > frequency)? I just
      > > > >> want to make sure I understand all these notions right.
      > > > >> Thank you,
      > > > >> Alex
      > > > >>
      > > > >>
      > > > >> On Mon, Oct 22, 2012 at 12:17 PM, David Turnbull
      > > <dturnbull@>wrote:
      > > > >>
      > > > >>> **
      > > > >>>
      > > > >>>
      > > > >>> I know Jared from this project and will be seeing him tonight.
      > > > >>> Unfortunately, he's told me this radio won't be good for hams.
      > > The ADC
      > > > >>> is 8-bit which doesn't offer much image rejection. Since it has huge
      > > > >>> bandwidth, this really isn't a problem for research or ISM use.
      > > > >>>
      > > > >>> 73 David AE9RB
      > > > >>> http://AE9RB.com/
      > > > >>>
      > > > >>>
      > > > >>> On Mon, Oct 22, 2012 at 8:37 AM, shaynal01 <steve@>
      > > > >>> wrote:
      > > > >>> >
      > > > >>>
      > > http://www.forbes.com/sites/andygreenberg/2012/10/19/darpa-funded-radio-hackrf-aims-to-be-a-300-wireless-swiss-army-knife-for-hackers/
      > > > >>> >
      > > > >>> > http://ossmann.blogspot.com/2012/06/introducing-hackrf.html
      > > > >>> >
      > > > >>> >
      > > > >>>
      > > > >>>
      > > > >>
      > > > >>
      > > > >>
      > > > >
      > > > >
      > > >
      > >
      > >
      >
      >
      > --
      > Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
      > Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
      > Senior Staff Specialist, Cricket Coach
      > Microsoft Windows Free Zone - Linux used for all Computing Tasks
      >
    • Sid Boyce
      They must get a real good deal as the Origen board starts at $199.
      Message 36 of 36 , Oct 29, 2012
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        They must get a real good deal as the Origen board starts at $199.
        http://www.samsung.com/global/business/semiconductor/minisite/Exynos/platform_partners_platform.html#Arndale-Board
        73 ... Sid.

        On 29/10/12 22:02, Alex Turcu wrote:
         

        ODROID-X is indeed an impressive platform. However at $129 it seems subsidized (the CPU module itself sells for $119 and is out of stock), but as with the BeagleBone, I like the modularity!

        Alex

        On Mon, Oct 29, 2012 at 5:37 PM, Sid Boyce <sboyce@...> wrote:
         

        I gave up on the Pi largely because of the USB load problems and the tussles I had with trying unsuccessfully to get sound working.

        I have replaced it with the ODROID-X which is running hiqsdr-server, dspserver and QtRadio happily.
        73 ... Sid.

         
        On 29/10/12 20:25, Shirley Márquez Dúlcey wrote:
         

        > Cheap as it is, I dislike the RPi for its closed SoC, and I seriously doubt it has the horsepower for SDR (last time I checked I had no confirmation it would work). While it does have a GPU that may have enough horsepower, > it lacks OpenCL support and Broadcom don't seem to eager to implement it anytime soon (nor release specs for the open-source community to implement)


        The closed-source issue is no longer true as of a few days ago: http://www.raspberrypi.org/archives/2221

        The lack of computing power remains. I don't know whether the GPU in the Pi has enough flexibility to implement meaningful OpenCL support... though with the driver source now available it's something the community can investigate.

        Broadcom has historically been a problem for the open-source community, notably its WiFi interfaces. Kudos to them for opening up the source for the SoC in the Pi.



        -- 
        Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
        Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
        Senior Staff Specialist, Cricket Coach
        Microsoft Windows Free Zone - Linux used for all Computing Tasks
        



        -- 
        Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
        Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
        Senior Staff Specialist, Cricket Coach
        Microsoft Windows Free Zone - Linux used for all Computing Tasks
        
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