2012.03.21_Test_observations - david-macmahon/wiki_convert_test GitHub Wiki

GBT GC 2011 - go back

Accumulation Time Bug

Acc time for these obs should be

((768*256*32+2)/32.0)/360e6 = 546.1335069444444 microseconds?

Calibration on 0359+5057

  • Previous user had done Q-band OOF so we kept their solution and thermal zernike
  • Did AutoPeakFocus on 0359+5057
    • Beams 3,7, Tsys ~62 K
    • Source Tant ~ 12.8 K, source flux ~ 10 Jy --> Gain ~ 1.2 K/Jy
2012.03.21_224455

On source 0359+5057 with noise source sent from VEGAS at ~25 Hz. Cal signal in fits files is inverted from polarity at receiver. The frequencies were set to 18.55, 19.8, 21.05, 22.30, 23.55, 24.8, 18.55, 17.0 from Anish's original script.

2012.03.21_230400

Configured correct frequencies. Still on 0359+5057 with noise cal switching.

19:12 - Move of in R.A. +4 minutes still in this scan. Now off source

2012.03.21_231257

Off source 0359+5057 by +4 minutes RA. Move to 0355+54 with noise source still on

19:20 - Turned off noise source

2012.03.21_232019

On source 0355+54 noise OFF. 19:28 - up until now I had frequencies flipped: vegas-hpc1 - 25.225, vegas-hpc2 - 23.927 etc. Now corrected to vegas-hpc1 - 18.735, 20.33125. Only affects fits files. Anish's script had proper frequencies. Starting a new data capture

2012.03.21_232800

On source. Looks like vegas-hpc2 is not receiving, so restarting

2012.03.21_233106

We're back all nodes up, on source 0355+54 noise OFF. This is a good set of data (we hope)

19:54 - Stopping to do 25 Hz cal, generated by telescope, so should be exactly 25 Hz. Telescope stopped, drifting

19:59 - On B0329+54

2012.03.21_235937

On B0329+54 with 25 Hz cal ON

2012.03.22_000132

20:02 - On B0329+54 Cal OFF Going to try configuring guppi.

20:06 - stopped after telescope took off when tracking using GUPPI

20:10 - Back on B0329+54

2012.03.22_001018

On B0329+54 Cal OFF

20:13 - Trying guppi again

20:34 - Stopping, moving to B0355+54

2012.03.22_003632

On B0355+54.

20:37 - Radiator tone ON at 22.414 GHz. Glass door closed. Wire antenna.

20:41 - Submitting GUPPI script

20:47 - Going to try track command with antenna out of coordinator to get guppi going

20:51 - Changed radiator tone to 22.050 GHz.

20:55 - Moving LO for guppi to move center frequency to 21.85 GHz

20:56 - Trying opening glass door and moving radiator outside.

Noticed dropped packets on vegas-hpc1 - was trying to plot a bunch of data and must have overloaded the machine.

2012.03.22_005837

Started again on B0355+54

21:13 - Running script to change guppi LO

21:18 - Going to calibrate on 0319+4130

21:21 - Cal source set to manual to come from Vegas

2012.03.22_012135

On 0319+4130, cal from VEGAS at ~25 Hz.

21:23 - Moving off source, continuing same data file. Was having some trouble deciding when we're off soruce. We tried going +4 minutes in RA, then -4 minutes in RA.

2012.03.22_012653

Should be off source from 0319+4130.