The observational setup is:

• sband receiver.
  
• 172 Mhz bandwidth centered  at 2278 Mhz
• the rf filter passes 2208 thru 2343 (135MHz)  so about 20Mhz on each edge of the band has little signal
• 256 freq channels are used (.67 Mhz resolution)
• sampling is 200 usecs for regular pulsars and 32usecs for J0437-4715
• 30minutes of data is taken for the 200 usec sampling (4+  2Gbyte files). Each 2Gbyte file 409 secs of data
  
• 15 minutes of data is taken with the 32usec sampling (13+ 2Gbyte files) Each 2Gbytes file has 100 secs of data.

Generating the movies.

•  Each movie includes observations made for 1 month.
• Movies are made of individual images
  
• the spectra from a scan are first averaged to 1 row of the fits files.
• 32 usec sampling,  spectra averaged to .66 seconds giving 1363 averaged spectra for the 15 minutes of  data
• 200 usec sampling. spectra averaged to 1 second giving 1800 averaged spectra fort the 30 minutef  data.
• dynamic spectra:
• The 15 or 30 minutes of are divided by the median spectra (to flatten the band pass)
• the image is scaled +/-  3 sigma full scale (using a robust estimator of mean and rms).
• the top Frame is polA, the bottom frame is polB
  
  
• rms/mean spectra
• the rms/mean by frequency channel is computed for each 2GByte file of the scan.  These are then over plotted with polA in the top frame and polB in the bottom frame.
• Each color is data from a separate 2 GByte file.
• A green horizontal line is the expected rms/mean (from the radiometer equation)
  
• Note: 200Usec data has 409secs/file. 32usec data has 100 secs/file.
• The title for each frame includes the date yymmdd, pulsar name, the file number for the first file of the scan, and the polarization.
  

Table of movies by month:

• date	dynamic spectra	rms/mean by freq  Chan	lastRun
  apr22	2204.avi	2204.avi	25may22
  may22	2205.avi	2205.avi	05aug22
  jun22	2206.avi	2206.avi	05aug22
  jul22	2207.avi	2207.avi	05aug22
  aug22	2208.avi	2208.avi	06sep22
  sep22	2209.avi	2209.avi	04oct22
  oct22	2210.avi	2210.avi	27nov22
  nov22	2211.avi	2211.avi	4dec22
  dec22	2212.avi	2212.avi	11jan23
  jan23	2301.avi	2301.avi	14feb23
  feb23	2302.avi	2302.avi	06mar23

Notes:

• the dynamic spectra show that the bandpass shape is not always stable.
  
• You can see a region moving from darker to lighter after being divided by the median value.
• The source B0329+54 seems to have this more than others.
• i don't know if  it rfi in that direction or maybe the change in temperature/rain for this time of  day.
  
• the rms/mean shows some 4 minutes files where the rms value is higher than normal
• polA tends to have a ramp fro 2250 going up in freq.
• polB  had increases around 2250 and 2290.
  

How best to watch the movies:

• use mpv
• It lets you
  
• single step forward: (period .)
  
• single step backwards:(comma ,)
• start/stop  movie (space key)
• slow down or speed up movie
  
• [  slowdown
• ]  speed up
• setup the default configuration of mpv to continuously loop when it hits the end  of the movie
• mkdir .mplayer
• cd .mplayer
• vi  config
• loop="0"

Other locations:

•  ben's pulsar processing:  /share/s3453g1/AO12m_data/psr_data/