ATNF VLBI Wiki

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

• DAS mode is correct
  • Don't forget to press тАЬConfig HwrтАЭ 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)