View page
Talk page

Current Status Summary

Modified 21:36, 11 Aug 2011 by horneff | Page History

    Version as of 15:55, 30 Apr 2024

    to this version.

    Return to Version archive.

    View current version

    Hardware Status as of 11. August 2011

    Electronics:

    All RCU modules plugged in.

    No know problem with the HBAs.

    Several LBAs with low power.

    High Band Antennas:

    All tiles are working. Two tiles (RCUs 179, 181) seem to oscillating from time to time.

    Low Band Antennas:

    One dipole may be oscillating.

    Some (even-numbered) dipoles show little to no power in the spectrum (like as if the LNA is not working). The problem is not always consistent: some seem to recover without active intervention, some seem to recover after pulling and re-connecting the RCU.

    Date RCUs with low power in rcumode 3
    Thu 11.8.2011 8 12 44 54   72   78 82 86   130 1381 148 150 1521 164 178
    Fri. 8.7.2011A 8 12 44   68 72 743 78 82 86   130   148 150 1522 164 178
    Mon 4.7.2011 8 12 44     72 741 78 822 86   130   148 150   164 178
    Fri 1.7.2011A 8 12 44   68 72   78   86   130   148 150   164 178
    Wed 29.6.2011A 8   44     72   78   86 92   138 148 150   164  

    Notes:
    A No attempt to recover signal by switching rcumodes done.
    1Recovered after switching to rcumode 1 and back (a number of times)
    2Showed changing power levels.
    3 At 50-50 MHz about 10-15 dB reduced at 20 MHz about 30 dB reduced.

    Computer Status as of 3. August 2011:

    Data Taking PCs

    All data taking PCs are working.

    Server

    lofarsrv is down due to a miss-connected network cable.

    Important or Interesting Webpages