P1978 pulsar polarization work

Problems with the cal deflections:

•    The cal deflection in the two polarizations were not correlating. This could be caused if two diodes were being used rather than 1. The measurement dates were:
  
• P1978:
• Ok: MJD 53370-7 (2005 Jan 0-7)
• Fail: MJD 53485-7 (2005 April 25-27) 
• Fail: MJD 53489 (2005 April 29)
• Fail: MJD 53490 (2005 April 30)
• P2110:
• OK:MJD 53779 (2006 Feb 13)
  
• Fail: MJD 53859 (2006 May 4)
• Fail: MJD 53860 (2006 May 5)
• Fail: MJD 53862 (2006 May 7)
• P2115:
• Ok: MJD 53697
  
• Fail: MJD 53699-700
  

• The data was in file: P1978.J1911+1758_north.wapp1.53485.0003.
• 11 cal cycles (about .5 seconds) were averaged together.
• The top plot shows the spectral band passes for the 4 stoked parameters. The solid line in cal on + Tsys, the dashed line is calOff + Tsys. No bandpass correction has been done. White is I,  red is Q, green is U, and Blue is V.
• The bottom plot has the stokes parameters of the cal deflection (calOn-calOff). This should be 100 % polarized if a single diode was used. Both U and V are zero. There is a small amount of power in Q. This is because the polA,PolB band passes have not been calibrated properly... The plot shows that two diodes were used.

• This has 3 seconds of cal on followed by 3 seconds of cal off.
• The first page shows the calOn and calOff stokes values. The dashed lines are cal Off.
• The 2nd page shows the stokes parameters for the cal deflection. The bandpass has been corrected using calon-caloff. The phase ramp from the iflo has also been corrected.
• The power in Stokes U is equal to the power in stokes I. This is to be expected for a single diode feeding both polarizations:

Conclusions:

• Two diodes were used for the wapp  cal deflections on 25apr05.
  
• Spider scan data taken on the same day with the interim correlator used a single diode.
  
• The hardware was functioning properly. The problem must have been that the gui did not configure the cal type correctly before taking the data.
• The wapp pulsar headers do not have the cal type used for the measurement (hcorcal,hcal, etc..).
• The cima.log file shows that the hcorcal was the cal that was requested but it does not show if this value was actually sent to the system (no vwsend line).