Status:

• beam 4a has not been working since shortly after alfa was reinstalled in aug11. It has strong oscillations.
  
• On 06oct11 (in the afternoon) the drain current was lowered from 17 to 11 milliamps.
  
• The oscillations stopped and 4a started working.
  
• With the drain current = 11mamps, the Tsys was about 90 K.
  
• A 12 db amp was placed after the dewar to increase the power level. Tsys decreased to about 55 K
• beam6b has intermittently been failing.

Data acquisition and processing:

• a2010 took data on 06oct11 from 21:00 to about 3:00 (07oct11) with beam4a and 6b both on.
• The total power was computed over each 100 Mhz band using the rms by channel to remove rfi.

• 06oct11 (.ps) (.pdf)
• page 15 starts the evening observing for 06oct11 (after the changes to 4a).
• The 12 sec peaks are the FAA radar which is very strong
  
• Both bm4a and bm6b are going into compression much more often than the other beams.
• 4b is not compressing while 4a compresses with a 6 second period (must be a second radar doing this).
• 6b compresses every 12 seconds while 6A does not compress.
  
• 07oct11 (.ps) (.pdf)
• 4a continues compressing.
• 6b starts to fail on page 1 around 00:13:34 am.This continues for the rest of the run.