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Red Pitaya - preliminary work

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    The red pitaya board (version 1.1, aka STEMlab 125-14) can be adapted to work as a digitizer for pulsed radar.

    We don't yet have a radR plugin to use this board, but the basic approach is:

    • use high-speed (125 MS/s) 14-bit ADC-A for video;
      set jumper for +/- 1 Volt input
      use resistor network for impedance matching
       
    • use high-speed 14-bit ADC-B for trigger
      set jumper for +/- 20 Volt input
       
    • use low-speed (100 kS/s) 12-bit ADC for ARP / heading (Analog input 0 = E2:pin 13);
      use resistor network to adjust range, limit current draw
       
    • use low speed 12-bit ADC for ACP / azimuth (Analog input 1 = E2:pin 14);
      use resistor network to adjust range, limit current draw.

    Pinout for header (extension connector E2) on which Analog Inputs 0 and 1 are available is here:

    http://redpitaya.readthedocs.io/en/l...sion-connector

    Front-end resistor networks are used to match impedance on the video line,
    and to limit voltage range on the other three lines.

    The forked version of the red pitaya source code base that supports this application is here:

    https://github.com/jbrzusto/digdar

    An image for a 4 GB micro SD card generated from the source above is here:

    http://discovery.acadiau.ca/radR/redpitaya/

    A capture utility that grabs from a networked red pitaya into sweep files is here:

    https://github.com/jbrzusto/capture

    Two of these boards have been deployed on radars:

    • Bridgemaster E 25 kW with 8' open array antenna, at the FORCE visitor centre (since Nov., 2014)
    • Furuno FR8252 with 6' open array antenna, at the Cape Sharp Lighthouse (since May, 2018)

    Images:

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    FileSizeDateAttached by 
     digdar_board_closeup.jpg
    close-up of cable connections
    1388.42 kB02:17, 6 Feb 2017JohnActions
     digdar_red_pitaya_open_box.jpg
    open box showing fan, cable connections
    1300.19 kB02:17, 6 Feb 2017JohnActions
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