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observing:changetest2014jun10

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observing:changetest2014jun10 [2014/06/11 03:23] (current)
Jim Lovell created
Line 1: Line 1:
 +Observing log:
  
 +<​code>​
 +12m antenna
 +-----------
 +May not have observed in optimum position
 +Data on HOB+1005
 +
 +Data recorded:
 +14:02:05 - 14:02:47 : on source
 +14:04:51 - 14:05:37 : off source (1d offset in Az)
 +Tsys off source ~110K
 +14:07 "on source"​. Tsys ~150K
 +</​code>​
 +
 +<​code>​
 +26m antenna
 +-----------
 +Data on FGI-0004
 +
 +14:12:03 At offset position
 +  source=off,​145620.06,​-141518.8,​2000.0
 +which is 4 min of RA from commanded 'on source'​ position of 145220.06,​-141518.8
 +14:13:48 - 14:​14:​45 ​ data recorded off-source
 +   Tsys ~ 60 K
 +   IF# at ten = 12 dB
 +   BBC voltages 0.1 - 0.35 V
 +14:17 on source (i.e. nominal position). Data signal seen at ~2dB higher than off-source
 +   BBC voltages 0.12 - 0.46 V
 +14:17:43 - 14:​18:​46 ​ recorded data
 +   Tsys 75 - 80 K
 +Next searched for peak signal. Found at source=off,​145159.04,​-141635.5,​2000.0 at 14:29 UT
 +Nominal source pos at this time was source=lunar,​145252.70,​-141702.4,​2000.0
 +
 +Offset applied was RA - 00:​00:​53.66,​ Dec + 00:00:27
 +
 +14:48:07 searched for peak signal. Found at source=on,​145230.02,​-141821.5,​2000.0
 +Recorded on source data from 14:47:09 to 14:47:39
 +
 +Expected position at 14:48 UT was source=lunar,​145326.12,​-141842.2,​2000.0
 +
 +Offset applied was RA - 00:00:55.1, Dec + 00:00:20.7
 +
 +14 dB of attenuation in IF3 is in range for BBCs, gives 60 K off source and 190K on source except in channel 8 where it's 383 K.
 +
 +</​code>​
/home/www/auscope/opswiki/data/pages/observing/changetest2014jun10.txt · Last modified: 2014/06/11 03:23 by Jim Lovell