Introduction:

• loop over the 20 bands covering 0 to 10 GHz
  
• configure filters, amps, spectrum analzyer for 1 band
• do a 1 minute peak hold
• read analyzer, write data to disc
• move to the next band

   Yearly movies were made  by taking a daily average over each band.

Some problems with the movies

• When the 430 or 2380 MHz radar is used, spurious signals get generated in many of the bands.
• via software (and then manually) i  tried to exclude all spectra taken while one of the radars was on.
• Occasionally the switch driver would not switch when commanded to. You would get data from the wrong frequency in a band.
• This did not happen very often. I tried to edit out most of these problems.
• For some periods, the air conditioner in the rfi shack was not working correctly. This changed the gain of the system
• some of the baselines  will  jump up and down a little from this.
• The value displayed are the dbm levels measured at the spectrum analyzer.
• Each band has a different set of filters/amplifiers so the band to band values will vary.
• The high frequency bands have less sensitivity.
• They use a 1-10Ghz amp. The gain can not be increased because of saturation from the cell phone bands.
• Some rfi makes harmonics/intermods in the system.
• The aerostat radar balloon at 1246,1261  causes birdies at 3200, 3400
• The cell phone bands: 1900,2100 cause birdies at 3900,4100.
• In the movies i've put solid lines (white,red) around the fundamentals.
• dashed colored lines bound the frequencies where the internally generated birdies may appear.
  

The movies:

    For each year 2 sets of movies were made:

•  low freq movie covering 260-1250Mhz in 6 band
• hi freq movie covering 1200-7000 Mhz in 6 bands

Notes:

• 2020:
• 12feb20: K&L switch controller failed. After this date, only 1325 band data.
• 2019:
• 31oct19: 330 and 430 bands absent.. relay failed that controlled these two bands.

processing: x101/rfi/hilltop/movie/

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