Beam2a jumps 28nov11

• file: wapp.20111128.a2048.0002.fits was used. ( I excluded the 2 cal spectra at the start).
• Page 1: total power vs time . Black in beam2A, red is beam 2B.
  
• Top: total power vs time. The vertical scale in linear in power
• You can see the jumps at: 69,114,693, and 731 seconds.
• Bottom: blowup samples 680 - 750 seconds.
• The power has been normalized to the median value.
• At 711 seconds it gets down to about 30% of Tsys.
• The values at 710 and 712 are equal.  A bit of a coincidence if this was an analog variation.
  
• Page 2: Spectra for time samples 700 - 714 seconds.
• Top: spectra 700-714 over plotted.
  
• Middle: spectra 700 and 711 over plotted.
• Bottom: Ratio spectra[700]/spectra[711]
• The HI line at 1420 MHz has canceled out so tsys must not have changed appreciably for the 2 spectra.

Summary:

• Beam 2a showed jumps that for many seconds.
• The system temperature did not change during the largest dropout.
• Looks like it might be a problem with the wapps (maybe the attenuators?)