Occurrence of rfi versus frequency by month

last month added: aug20

    Histograms of interference versus frequency are computed for the data acquired on the telescope using the correlator. For each scan of N separate integrations (typically 1 second) the rms/Mean by channel is computed. A linear baseline is used to remove any zenith angle dependence.

     Histograms are then made of the number of rfiCnts/TotalCnts by frequency channel. Any rms/Mean greater than 3 times the expected sigma is called rfi. This sigma is computed using the bandwidth, integration time, and corrections for: 3/9 level sampling, hanning smoothing, and the instrumental bandwidth of the channels. Any band passes that have more than 80% of their channels "bad" are not included in the rfi or total counts. The histograms have .1 Mhz resolution. The rfi count in the .1 Mhz channel is incremented by 1 (and only 1) if any of the telescope channels within the .1 Mhz bin exceed 3 sigma.

    There is a cumulative plot for the year followed by monthly plots. Each plot has the fractional occurrence of rfi in black. The blue histogram is the total number of counts (nonrfi + rfi) in each bin. The vertical scale on the right tells the total counts per bin. The red line is a histogram of the number of times a bandpass was rejected because more than 80% of the frequency bins were above 3 sigma. This histogram has been scaled to: badcnts/(total counts + badcounts). If there are a large fraction of red lines it may be because of some mapping programs that include large continuum sources or have large za variations for the strip (some of the alfa proposals).

PLOTS OF rfi by year and month.

The entries without links have no data for that month. The 611 and 327 receiver have not been installed a large fraction of the time. Occasionally the rfi monitoring will take data on the receiver when it is not there (so there is just a load connected). This depends on whether I remember to update the receiver file to use (and that electronics reminds me that they have put it up or down). Sband 1800-3100 switched from just sband narrow (2320-2420) to the full range of 1800 to 3100 sept01 when the sband wide receiver was reinstalled. The pattern of dips in the total counts by bin (blue lines) is from the x111 datataking. It steps by 23 Mhz giving an overlap of 1 Mhz and the plotting ignores 1 Mhz from the edge (do to filter rolloff). If you use ghostview to look at the plots, clicking on a mouse button will blowup the region centered on the mouse.
 

Why to do the plots look lousy :

Fractional Occurrence of Rfi
 
327 
(310-340)
430 
(410-445)
800
(700-800)
lband 
(1100-1800)
lband (blowup) 
(1250-1450)
alfa 
(1220-1520)
sband
(1800-3100)
sbh 
(3000-4000)
cband 
(4000-6000)
cb Hi 
(6000-8000)
xband 
(8000-10000)




RFI BY YEAR








YrToDate
YrToDate
YrToDate
YrToDate
YrToDate
YrToDate
YrToDate
YrToDate
YrToDate

Yr2019
Yr2019
Yr2019
Yr2019
Yr2019
Yr2019
Yr2019
Yr2019
Yr2019

Yr2018
Yr2018
Yr2018
Yr2018
Yr2018
Yr2018
Yr2018
Yr2018
Yr2018

Yr2017
Yr2017
Yr2017
Yr2017
Yr2017
Yr2017
Yr2017
Yr2017
Yr2017

Yr2016
Yr2016

Yr2016
Yr2016
Yr2016
Yr2016
Yr2016
Yr2016
Yr2016
Yr2016

Yr2015
Yr2015

Yr2015
Yr2015
Yr2015
Yr2015
Yr2015
Yr2015
Yr2015
Yr2015

Yr2014
Yr2014
Yr2014
Yr2014
Yr2014
Yr2014
Yr2014
Yr2014
Yr2014
Yr2014
Yr2014

Yr2013
Yr2013
Yr2013
Yr2013
Yr2013
Yr2013
Yr2013
Yr2013
Yr2013
Yr2013
Yr2013

Yr2012
Yr2012
Yr2012
Yr2012
Yr2012
Yr2012
Yr2012
Yr2012
Yr2012
Yr2012
Yr2012

Yr2011
Yr2011
Yr2011
Yr2011
Yr2011
Yr2011
Yr2011
Yr2011
Yr2011
Yr2011
Yr2011

Yr2010
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Yr2010
Yr2010
Yr2010
Yr2010
Yr2010

Yr2010
Yr2010
Yr2010

Yr2009
Yr2009
Yr2009
Yr2009
Yr2009
Yr2009
Yr2009

Yr2009
Yr2009
Yr2009

Yr2008
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Yr2008
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Yr2008
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Yr2002
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Yr2002
 
 Yr2001
 Yr2001
Yr2001
Yr2001
Yr2001

 Yr2001
 
 Yr2001

 




RFI BY MONTH








aug20
aug20
aug20
aug20
aug20
aug20
aug20
aug20
aug20

jul20
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jul20
jul20
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feb20
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feb20
feb20
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jan20
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jan20
jan20
jan20
jan20
jan20
jan20
jan20

dec19
dec19
dec19
dec19
dec19
dec19
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nov19
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nov19
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nov19
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oct19
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aug12
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jul12
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jun12
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may12
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apr12
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mar12
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feb12
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jan12
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Year 2011 comments:


Year 2010 comments:


Year 2009 comments:


Year 2008 comments


Year 2005 comments

  • mar05 - The rms for the wapp data was computed and then stored in the old interim correlator format back out on disc. The frequency flip was occasionally getting screwed up. Fixed the problem and then processesed the data nov04 though feb05. The lbw/alfa birdies should now be in the correct positions.
  • feb05  - updated exclude criteria for wapps. Some patterns were being included that shouldn't have been. Reprocessed the data.
  • Year 2004 comments

  • nov04 - include alfa data and wapp data for the other recievers.
  • feb04 - 6 to 8 Ghz (cbh) installed.
  • Year 2003 comments

  • sep03 - xband. the blocks of 25 Mhz that have rejected bands (red) is from the lousy pointing at xband. Some users were doing on/offs on strong continuum sources. The power in the on varied over the scan. When computing the rms by channel you got large values. Since the continuum source affect all channels, the band got rejected (red gt 85% of channels bad)..
  • feb03 - telescope shutdown. drift scans 327,cband (4800) , and lbndrift.
  • feb03 - sbwide,lbw switch in filters while stepping. especially sbwide..
  • Year 2002 comments:

  • sep02 327 data was being taken at the wrong frequency. Was using 260IF and trying to get 4 sub bands out of it. When the new receiver/filters were installed in jul2002, the file x111auto.dat was not updated for the new bandwidths. Was corrected on 16sep02.
  • aug02 327 2 Mhz comb from 430 waveguide power monitor.
  • Year 2001 comments:

  • jan-mar 1366,1382 radar (more info)
  • March:  seti observations, not much data.
  • April:  Tv station at 1408 (more info)
  • May: Tv station at 1408 (see above link)
  • July: aeronomy runs, not much data.
  • August:  A1459 baseline instabilities (1340-1440) from air conditioner in dome (more info).
  • Sept: A1459 baseline ripples (see above).
  • sband wide. The Yr2001 data shows that the fraction of band passes that were rejected (the red lines) stays high up to 2600Mhz and then drops to zero.  I think this is because the birdies at 1940 Mhz are overloading some components after the 1 Ghz filter of the 10 Ghz upconverter. When you are farther than 500 Mhz from 1940, the cellular phones at 1940 start to get filtered out. The culprit is probably the fiber optic link. When the power levels are adjusted, the total power is used. It is high from the 1940 birdie so the spectral density for the rest of the band gets  set to low.
  • processing: rfi/rms/mkyr.pro
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