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lbaops:fringetroubles

Fringe Finding Troubleshooter

If you fail to find fringes to your telescope check the following:

  • DAS mode is correct
    • Don't forget to press “Config Hwr” button
    • Correct flipped or non-flipped profile selected
    • Has the DAS profile accidently been overwritten?
  • PC clock is correct
    • Check with /usr/bin/ntpdata -q MACHINE

MACHINE is pool.ntp.org for utas or pkvsi1-ext for atnf

  • Antenna pointing at correct location
    • Antenna on source at time of fringe check
    • At Parkes atsnap has to be run after changing receiver
  • Polarisation is correct
  • Maser-GPS offset is as expected
  • Frequency correct
    • Coherence OK
    • Can detect test tone in expected place with fauto
  • Disk recorder is recording OK
    • Correct channels selected in disko
    • Sampler stats (shown in cdisko) look OK
    • fauto give sensible results
    • bigbuffer has not overflowed (restart recorder)
lbaops/fringetroubles.txt · Last modified: 2015/12/18 16:38 (external edit)