Testing procedure:

    Felix turned on and off the camera using about a 2 minute cycle.

• To turn on the camera he had to open the huffman, turn on the power and the close the huffman box
• After turning on the camera it would move in azimuth and elevation for about 40seconds.
  
• To turn off the camera, the huffman box had to be opened to shut off the power.
• The test cycle was:
• turn on the camera, report time
• report when moving stopped
• turn off the camera and report time
  
• The tables below shows the testing cycle.

• Sband test

  test #	on time	Stopped moving	offTime	Moving time
  recording start	8:53:00
  1	8:55:08	8:55:53	8:57:59	45
  2	9:00:05	9:00:48	9:02:10	43
  3	9:04:15	9:05:00	9:06:43	45
  4	9:08:46	9:09:29	9:10:48	43
  recording stop	9:10:56

•  

• Xband test

  test #	on time	Stopped moving	offTime	Moving time
  recording start	9:11:47
  1	9:13:55	9:14:39	9:16:05
  2	9:18:10	9:18:54	9:20:13
  3	9:22:21	9:23:06	9:24:25
  4	9:26:29	9:27:12	9:28:34
  recording stop	9:28:44

  
  

Processing the data.

• sband:
• 1013 seconds of data,
• 1 file was input
• xband:
  
• 1018 seconds of data
• 7 files were input (one for each freq band)
• for each file:
  
• PolA and B were averaged for each second.
  
• dynamic spectra were made by flattening the spectra with the median spectra.
• The dynamic spectra were smoothed/decimated by a factor of 2 in time  (to 2 second resolution)
• sband:
  
• For the entire freq range:
• the freq was smoothed/decimated by a factor of 6 giving 1365 freq channels of 126Khz resolution.
  
• Images with blowups in freq were also made:
• 34 MHz junks, (1600 channels) with no frequency smoothing (21 KHz resolution)
• Xband
• dynamic spectra for each 172 MHz freq band was made with 126Khz resolution (no blowups in freq).
  
• For each dynamic spectra:
• horizontal colored lines were drawn on the images to show when transitions occurred.
• Green: off to on
• Yellow: camera stopped moving
• red    : camera turned off.

The dynamic spectra:

    the tables below show the dynamic spectra for the sband and xband measurements.

Summary 26aug22 at 12meter pad

• sband:
• continuum rfi was seen in the sband receiver.
• it started a few seconds after the 45 second move.
• felix had noted that after the 45 second initial move there was a period of about 30 seconds when the camera sat still and then is did another short sequences of moves. the rfi looks like it is occurring during this 30 seconds when the camera sits before the final move.
  
• I wonder if the camera is trying to report back via ethernet that it has completed its startup up?
• This test did not include the fiber optic transceiver that will go from the ethernet switch out to the rest of the world.
• xband
• No camera rfi was seen in the xband receiver.

processing: x101/220826/testcamerasb.pro,testcameraxb.pro

31aug22: camera mounted on 12meter control building

    On 31aug22 a   stationary camera was placed on top of the 12meter control building and an rfi test was done (the previous tests used a camera with a motor that could point in different directions). Data was taken at sband and xband. A number of tests were done:

• test#1: sband
  
•  huffman box power switched on,off (this also powered on,off the camera).
  
• the fiber media converter in control building was left on.
• test #2: xband
  
• huffman box power switched on,off (this also powered on,off the camera).
  
• the fiber media converter in control building was left on.
• test #3: sband
• media converter in control room and  huffman box powered on,off
• test #4: sband
• huffman box, median converter left off
• ethernet switch in control building switched on,off.
  

Setup:

• The camera was placed on the roof of the 12meter control building.
  
• A fiber and power cable went from the control room to the huffman box.
• the huffman box:
• had a media converter fiber to copper.
• Power over ethernet was then sent to the camera.
• in 12meter control room:
• a media converter went from fiber to copper.
• The copper ethernet was plugged into a multi port ethernet switch. A fiber cable exited the switch and went down to the ao Network.
  
• photos:
• camera attached to huffman box in electronics lab (.jpg)
• camera and huffman box on top of the 12meter control building (.jpg)
• the camera on the  poll is another camera that has been at the 12meter site for awhile.
  
• The 12meter telescope was rotated to az=0, el=6  to point at the camera.
• The receivers used:
•  sband receiver with center freq of 2270MHz.
• xband receiver  7x172MHz bands covering 8135 to 9150 MHz.
  
• The mock spectrometer was used to record the spectra:
• sband:
• 1 mock box, 172.032 MHz bw,  512 channels,  pola,b, .2 second integrations.
• xband
• 7 mock boxes, 172.032 MHz bw , 512 channels, pola,b  , .2 second integrations.
  
• the data recording was started on a 1  second tick and ran continuously during each test.
• The 512 channels was a mistake, I really wanted 8192 channels
• the rbw was 336Khz instead of 20Khz. This will make total power rfi stand out better in the images, but narrow tones will be harder to see.'
• the .2 second spectra were integrated to 1 sec before display.
  

Testing procedures:

    Felix turned on and off equipment with a 2 on, 2minute off cycle.

•  Test1: sband: huffman box power on,off  with 2 minute cycle
• 09:10:13 to 09:31:11
• mock file .00000
  
• 5 cycles
• on 2 minutes, off 2minutes
• (but we started with camera on rather than camera off)
• The media converter in the control room was left on
• Test2: xband: huffman box power on,off with 2 minute cycle
• 09:33:14 - 09:51:28
• mock file: 00100 .. 7 bands
• 4 cycles
  
• on 2 minutes, off 2 minutes
• started with an off.
• the media converter in the control room was left on.
• Test3: sband:media converter and huffman box power on,off with 2 minute cycle
• 09:56:25 to 10:12:50
• mock file 00200
• 3 cycles
• on media converter
• 1 minute later huffman box on
  
• 1 minute later both off for 2 minutes.
• Test4: sband: huffman box off, media converter off, cycle ethernet switch in control room on,off.
• 10:13:37 to 10:28:17
• mock file .00300
• 3 cycles
  
• switch on 2minutes
• switch off 2minutes
• started with an off.

Processing the data.

• for each file:
  
• PolA and B were averaged for each second.
  
• dynamic spectra were made by flattening the spectra with the median spectra.
• The dynamic spectra were smoothed/decimated by a factor of 2 in time  (to 2 second resolution)
• the freq was blown up by 2 to give 1024 pixels.
  
• For each dynamic spectra:
• horizontal colored lines were drawn on the images to show when transitions occurred.
• Green: off to on
• red    : on to off.

The dynamic spectra:

    the tables below show the dynamic spectra for the sband and xband measurements.

Summary 31aug22 camera on top of control building

• No rfi was seen from the camera, huffman box, media converter or network switch.
• The channel width was 336 KHz so narrow birdies might not have been seen.

processing: x101/220831/testcamerasb.pro,testcameraxb.pro,testcamera_mc_sb.pro,testswitch.pro

221102 testing new camera on top of control building

    On 02nov22 a new cameras was installed on top of the 12meter control building for rfi testing.

Setup:

• camera in huffman box on top of control building
• fiber and acline -> inside control building.
• 12m: sband, cfr 2270
• mocks: 172.032Mhz, 8192 channels, 1 sec dumps.

Datataking:

• Start the mock spectrometer running (file: x101.20221102.b0s1g0.00100.fits
• off for 2 minutes (pull the ac power in the control building)
  
• on for about 3 minutes. leave 2 minutes after video appeard.
• cycle off,on 3 times.

The image shows the dynamic spectra taken while cycling the camera (.jpg)

• xaxis:
• 172.032 Mhz bw/8192 chan=20Khz. The image was then smoothed, decimated by 5x (100Khz) to fit on the screen.
• yaxis:
• the time was smoothed, decimated by 2 to fit on the screen giving 2 sec resolution.
  
• The green line shows the start of camera off
• the red lines shows the start of camera on
• the video usually appeared 53 seconds after power on

Summary 221102:

• no rfi connected with cycling the camera was seen using 2 second time resolution and 100Khz freq resolution.

processing:x101/221102/testcamerasb.pro