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Page last modified 17:45, 24 Mar 2015 by Christiaan Brinkerink
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CARMA

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    Version as of 17:01, 18 Apr 2025

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    CARMA provides 2 VLBI stations:
    • 8 antennas are phased together in a set of beamformers and recorded on one Mk6 recorder. 
    • a separate 'reference' antenna is connected to a standard BDC and R2DBE and is recorded on a separate Mk6 recorder.
     
    The exact LO1 frequency for the 2015 experiment is:
    f(LO1) = 3 * (7 * (9 * fsynth - 10 MHz) + 50 MHz)
       = 221099.999970 MHz (for fsynth = 1170.158730 MHz)

    A diagram of the CARMA IF system is shown below.  The signals for the reference antenna are taken from wideband directional couplers in the fiber IF receiver boxes; these 1-9 GHz bands are sent to standard EHT block downconvertes and R2DBEs.  The signals for the beamformers are taken from the outputs of the CARMA analog downconverters.

    CARMA-IFdiagram.png

    The beamformers are channelized as shown below (same as 2013):

    DEBlayout.png

    DSC00447-001.JPG

     
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