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lbaops:fringetroubles [2015/12/18 16:38] (current)
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 +===== 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)