n21dk01

    Version as of 22:05, 4 Nov 2024

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    n21dk01 Correlation Report

    General information

    • Project: "Wideband spectral line VLBI study (Dongjin Kim) 22/43GHz 8Gbps"
    • Epochs: G, H, I, J, E, K, L
    • Station feedback:

    Status

    what date
    Effelsberg transfer Epochs G and H complete, remainder postponed due EVN Session 2 VLBI (27 May-17 Jun) 20.05.2021
    Yebes transfer Epochs G, H, I, J, E complete 11.06.2021
    Effelsberg transfer Epochs I, J, E, K, L completed 23.06.2021
    Fringes Ef-Ys K-band and Ef-Ys Q-band, epoch G 10.06.2021
    KVN Yonsei started transfer of epoch G 16.06.2021
    KVN Ulsan started transfer of epoch G... 14.07.2021 still transferring...  

    Epoch Ef xfer Ys Kt Ku Ky
    G 20.5. ok 11.6. ok 22.7. ok 10.7. ok 1.7.
    H 20.5. ok 11.6. ok 25.7. ok -not started- 23.7.
    I 23.6. ok 11.6. ok 5.8. ok 4.8. ok 3.8.
    J 23.6. ok  11.6. ok -not started- -not started ongoing
    E 23.6. ok 11.6. ok 1.8. ok 29.7. ok 28.7.
    K 23.6. ok (not observed) -not started- -not started- -not started-
    L 23.6. ok (not observed) -not started- -not started- -not started-

    A Priori

    Yebes

    • J. Gonzales: rate 1.17e-13 s/s, offsets in logs named n1k01?ys.log on vlbeer.
    • Did not observe K and L due to heavy rain and broken shutter.
    • Transferred the data of G, H, I, J, E.
    • VEX freq block sidebands UUUU UUUU LLLL LLLL rather than the default UL UL ... from SCHED
    • Epoch E: scan No0003 (142-0814) file empty or not recorded

    Effelsberg

    • U. Bach, etransferred epochs G & H. Pending transfer of the remaining epochs.
    • Offset +19.3 usec in G
    • Logs named ndk01g, ndk01h, and later n1k01i, n1k01j, n1k01k, n1k01l, n1k01e on vlbeer
    • H-maser rate same as in GMVA f211a, i.e., 2.05e-13 s/s.
    • VEX freq block sidebands UUUU LLLL rather than the default UL UL ... from SCHED.
    • Epoch G: wind and bad weather, first part ot track unusable, not on source until ~18:30 UT

    KVN Yonsei, Ulsan, Tamna

    • Waiting for e-transfer...
    • Table of clock offsets, sign for VEX same as in table
    • H-maser rate?
    • Tie of KVN to Ef+Ys : shift KVN VEX clocks by -2.83 us from kvn a priori values

    DiFX

    Special setup for correlation, because Effelsberg does not have simultaneous K and Q capability.

    • One v2d file for K-band, with "freqIds=..." to select only K-band recorded frequency IDs
    • Another v2d file for Q-band, with "freqIds=..." to select only Q-band recorded frequency IDs, and "deltaClock=.." to include any clock offsets over K-band reference clocks
    • Zoom bands of 64 MHz due to KVN 2ch x 512 MHz, versus Ef and Ys with 64 MHz wide channels in USB/LSB
    • Same zoom bands also added to Ef and Ys in order to produce all-USB visibility data; otherwise HOPS fourfit issues

    Fringes

    Station Code Fringes Plots Comments
    Ef K   track G No0053 Ef-Ys    
    Ef Q   (todo)    
    Ys K   track G No0053 Ef-Ys     
    Ys Q   track G No0053 Ky-Ys   SNR~21 in 196s
    Kt K   (todo)    
    Kt Q   (todo)    
    Ku K   track G No0044 Ku-Ky   SNR~25 in 156s
    Ku Q   track G No0044 Ku-Ky    
    Ky K   track G No0053 Ef-Ys    
    Ky Q   track G No0053 Ky-Ys    

    Notes

    Post-Correlation checks

    Residuals

    FITS completeness (pclist)