GMVA 4Gbps test (4.4.2019)

    Version as of 10:28, 28 Mar 2024

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    Summary

    Prior to the regular fringe test of session c191 a test for recording at 4 Gbps will be executed

    Participating stations: VLBA, Pv, On, Ys, Mh, Ef, Noema

    Sky frequency band: 86012 - 86524 MHz  (512 MHz)

    Setup

    VLBA

    RDBE DDC mode with 4x128 MHz bands, dual-pol

    sky  start sky  stop bandwidth Sideband
    86012 86140 128 USB
    86140 86268 128 USB
    86268 86396 128 USB
    86396 86524 128 USB

    DBBC2 stations (Pv, On, Ys, Mh, Ef)

    All DBBC2 stations should use:

    • DDC mode (firmware 107 beta3)
    • 8x64 MHz bands, dual-pol.
    • IF setup: identical to standard GMVA 2Gbps mode using 2 core boards
    • Use 2nd Nyquist zone: 512 -1024 MHz
    • dbbcform=astro

     

    bbc freq sideband bandwidth sky start sky stop
    576 LSB 64 86524 86460
    USB 64 86460 86396
    704 LSB 64 86396 86332
    USB 64 86332 86268
    832 LSB 64 86268 86204
    USB 64 86204 86140
    960 LSB 64 86140 86076
    USB 64 86076 86012

    DBBC3 stations (Pico Veleta P3)

    Pico Veleta will do simultaneous processing on the DBBC2 and DBBC3 backends.

    • DDC_V mode (firmware V124)
    • 16x32 MHz bands, dual-pol.
    • 1st LO=92100 (dictated by the DBBC2 IF requirements)
    • 2nd LO= 8000 (DBBC3 GComo)
      • Use E90LI IFs (4-8 GHz LSB
      • Baseband: 0-4 GHz USB => 84100 - 88100 sky freq

     

    bbc freq sideband bandwidth sky start sky stop
    1944 LSB 32 86012 86044
    USB 32 86044 86076
    2008 LSB 32 86076 86108
    USB 32 86108 86140
    2072 LSB 32 86140 86172
    USB 32 86172 86204
    2136 LSB 32 86204 86236
    USB 32 86236 86268
    2200 LSB 32 86268 86300
    USB 32 86300 86332
    2264 LSB 32 86332 86364
    USB 32 86364 86396
    2328 LSB 32 86396 86428
    USB 32 86428 86460
    2392 LSB 32 86460 86492
    USB 32 86492 86524

    R2DBE stations (NOEMA)

    Will use EHT mode: 1 x 2048 MHz dual-pol

    sky freq start sky freq start bandwidth sideband
    TBD TBD 2048 TBD