Topics

    Sources:

• Sources Table
• ra,dec rise,transit,set lst's with keyhole for 3.5 to 12deg za
  

    Observing plans:

•  Jun10:

• Observation plan V4 (.pdf)
• Aug10:
• definitions of maps
• Observing plan (V2)(.pdf)
  

    Observing log files

• June10 observing
• Aug10 observing

    History:

• Modifications, hardware, software
• Super fine grids done
  
• fine grids done
• Mosaics on extended sources
• az strips on weak sources
• absorber measurement
  

    All measurements, miscellaneous in chronological order

    BYU paf results:

• 31x31 super fine grid sensitivity maps
• 15x15 fine grid sensitivity maps
• 7x7 coarse grid sensitivity maps
• z focus scans
• beam patterns
• Extended sources
• Weak sources
• Frequency scan
• Absorber
  

    Misc:  (top)

• possible problems with tracking sources.
• communications: AO BYU computers
  
• ip addresses,gateways
• The byumap mapping routines
• The coordinate systems used.
• Mounting reference pictures
• Mounting reference pictures for single pol feed (.pdf)
• aug10: single pol mount picture(.jpeg)
• aug10: dual pol mount picture (.jpeg)
  
• The positioner.

    Articles:  (top)

Sources:  (top)

• catalog codes:
• N nvss.
•  flux is at 1400 MHz,
  
• coordinates are J2000
• maj,min are major minor axis in asecs
  
• C
•  ao calibrator file .
  
• flux is at 1600 MHz
• The source name links are nvss images of the source at 1405 Mhz.
• The images are +/- 7.5 amin, ra increases to left , dec increases up
  

at least a double...
16 51 11.70 +04 59 19.0 23Jy
16 51  3.85 +04 59 41.9 11.1 Jy
16 51  4.94 +04 59 42.3  8.5 Jy

Source ra,dec, rise/transit/set times  (top)

• The  plots show the declination vs ra for each source.
• Page 1: Source tracking limited to 3.5 <=za <= 12 degrees
• We are currently constrained to 3.5<za<12 and the temperature < 75F.
  
• Sources that hit the keyhole (3.5 deg za) are split into two sections (before and after transiting the keyhole).
• The vertical dashed lines show 20:00 AST (black) and 7:00 AST (red) on 15jun10. This is the time range when we can expect 75 F or less temp.

• Page 2: Unlimited za range (za 1.06 to 19.69 deg)
• The bottom of each page shows the source name, flux, and tracking time.

Possible problems tracking sources: (top)

• Daytime tracking of sources  can be hampered by losing tensions in the tiedown cable tensions.
• Currently no daytime tracking is allowed so this is not a problem!!!
  
• If the dome is at a large za and the azimuth points  toward a tiedown, the unbalanced moment arm can cause tension to be lost. This can  cause a pointing error of a few arcminutes and it can cause the horn to move in the focus direction (because the platform has an incorrect tilt).
• The apr10 run especially around noon will have this problem with 3C48,CTA21.
• The path that the horn takes as the dome moves in az/za in not exactly on the paraxial surface.
  
• We run the azimuth arm in an unbalanced mode (the dome weighs much more that the carriage house). This causes pitch,roll, and focus errors as we track a source.
  
• The elevation rails are shimmed to minimize this error. The shimming doesn't do much for the az dependence.
• After the last shimming feb03, a theodolite survey was done july03 to measure these errors:
• Two za strips were done going 2 to 19 degrees za at az=242.87 (pointing at corner 8) and az=302.87
• Two az swings were done with dome za=5 and 15 degrees.
• The dome location was measured with a theodolite from AO9 (center of the dish).
• The pitch,roll, focus errors after the last theodolite survey.

Communications: AO and BYU computer   (top)

• The BYU system is a  slave. The AO control system will be in control
• Communications will be message oriented.
• Messages will all be in ascii (I know, this is different than what i said before, but i changed how the AO system interacts with BYU).
  
• A message will end with a newline character .. \n
• The BYU system will listen for a connection on a  port number and accept the connect request from AO.
• It only needs to have 1 connection active at a time.
• Sequence of events
• BYU listens on port
• Ao connects to BYU port
• messages are exchanged always initiated by AO.
• An AO message is always followed by a BYU reply (except for the aocmd EXIT).
  
• Ao sends an EXIT  messages or the connection is dropped.
• BYU goes back to listening on the port (or it could just quit).
• Message formats:
• From Ao:
• "AOCMD"  info
  
• Reply from Byu
• "aocmd"  stat  info
• stat coming back from BYU can be ok or err.
  
• If stat == err then info can be an error message.
  
• AoCmds:
• The aocmd will always be in upper case.
  
• The BYU replies will start with the aocmd in lower case to help keep things synchronized.

Ip addresses/gateways  (top)

• Gateway for all byu/positioner  devices to use: 192.65.176.1  (observer)
  
• positioner (on rotary floor):
• Positioner address: 192.65.176.161
  
• Will talk to cor computer at: 192.160.174.7
• byu host telescope communications (computer in transmitter room in dome)
  
• byu host address: 192.65.176.160  listens on port 5010.
  
• Will take to cor computer at : 192.160.174.7
• byu host remote desktop login (computer in transmitter room in dome).
• 192.65.176.162 gateway 192.65.176.1
• Davids laptop :
  
• 192.65.176.164  gateway 192.65.176.1s.
  

The byu mapping routines:  (top)

• byumapdipoles ra dec secPnt focus off_steer {posOffAzAmin 0.} {posOffZaAmin 0.}
• positions source in each dipole
  
• Uses the file byu/dipoffAmin.dat for the dipole positions.
• Uses germans number scheme.
• byumaplowres ra dec secsPnt focus off_steer {posOffAzAmin 0.} {posOffZaAmin 0.}
• does the low res grid 7x7 with 1.5 amin stepping..

• byumap ra dec azOffAmin zaOffAmin stepAmin secsPnt focus off_steer {firstZaStrip 1} {firstAzPnt 1} {posOffAzAmin 0.} {posOffZaAmin 0.}
• does a grid of   azOffAmin/stepAmin *2 + 1 points in az an similar in za.
  
• byucross ra dec azOffAmin zaOffAmin stepAMin secsPnt focus off_steer {posOffAzAmin 0.} {posOffZaAmin 0}
• do a cross in az then za.
• The routine will perform two separate setup calls to the byu computer. One for the az and on for the za strip.
  
• Assume there are 31 steps in the az and the el direction, with 1.5 Amin steps. and 4 sec integrations then
  
• az strip: SETUP 1 31 1 1 1.5 4 0 1
• za strip: SETUP 31  1 1 1 1.5 4 0 2
  
• byugetfile filename pntI
• input an ascii  file of az,za offsets (units: amin).
  
• # in col 1 is a comment line, everything after the 2nd token in a data line is ignored.
  
• Info returned in pntI()
• pntI(npnts)  number of points
• pntI(0)    pnt 0   azoffAmin  zaOffAmin as a list
• pntI(n-1) pnt n-1)  azoffAmin zaOffAmin as a list
• byupnts ra dec pntI secsPnt focus off_steer {posOffAzAmin 0.} {posOffZaAmin 0.}
• go through a list of points sequentially
• used byugetfile to input the points.
  

• 29apr10: Testing the byumap pointing routine.
  
• 28apr10: Errors in arclength using arclength/sin(za) approximation
• ricks 20 meter code

Time to execute patterns:

• No cals are included in these measurements
• 4 second integrations were used.
  

The positioner  (top)

Controller:aires 9000 4 axis controller from parker motion.

• Manuals
• Communicating with positioner (davids email).
• feed clearance (david) (.pdf)   feed clearance (german) (.pdf)
• hexagon beam below floor cuts into the outer hoop of  turret (.jpeg)

Articles (top)

• van Veen & Buckley,1988, Beamforming: a versatile approach to spatial filtering (.pdf)
• Landon et all, 2009, Phased array feed calibration, beamforming, and imaging (.pdf)
• gbt test with byu 19 feed array.
  
• Fischer et al, Phased array feeds (astro2010 technology development white paper).
• jeffs et al, Progress in Phase array feed development for radio astronomy (.pdf)
• presentation seti institute july,2009
• International Workshop on Phased Array Antenna Systems for Radio Astronomy, BYU may10 presentations.
• German cortes presentation at byu meeting (.pdf) 75 mb)
• Uniform aperture approximation (german 08jul10) (.pdf)
• AOPAF preliminary report (germain 13sep10) (.pdf).
• polarimetric calibration of paf  IEEE 2011 warnick.
  

Measurements/Misc.:  (top)

• 100902: System sensitivity using 1 dipole. Absorber measurement, and all crosses.
  
• 100819: beam A1 thru A6 position offsets from A0 (on the sky) after correcting for pointing errors.
• 100816: beam A1 thru A6 position offsets from A0 (on the sky) after correcting for pointing errors.
  
• 100626: Plots of dipole offsets for various positions of dipole. In focal plane and on sky.
• updated to the configuration actually used.
  
• 100625: email from brian jeffs: finishing the single pole observations.
  
• 100621: position errors for A0 super fine grid with rick fischers iterations.
  
• 100617: data:14jun10... crosses on center dipole position A0 (.ps) (.pdf)
  
• 100616: computed spillover of typical dipole on tertiary. What would Tsys for center dipole be? (.ps) (.pdf)
• 
  
• 100607:Testing the offset equations using the turret motion and lbw
• 100521: weight of equipment to be installed in dome (.eml)
  
• 100429: Testing the byumap pointing routine.
  
• 100428: Errors in arclength using arclenth/sin(za) approximation
• How long can we track a source at a given declination (.ps) (.pdf)
• The horizontal lines are declination strips in 1 deg increments.
• The vertical lines are time steps in 5 minute increments. dash vertical lines are placed every 30 minutes.
• Dipole layout (german) (.pdf)
• pitch,roll, focus errors after the last theodolite survey.

Byu paf results  (top)

• 31x31 super fine grid sensitivity maps
• 15x15 fine grid sensitivity maps
• 7x7 coarse grid sensitivity maps
• z focus scans
• Extended sources
• Weak sources
• Frequency scan
• Absorber
  

Note:

• the definition of +za in the grids was switched after the jun10 data and before the aug10 data. I think the jun10 definition was correct, but it was switched none the less.
  

31x31 super fine grid sensitivity maps:  (top)

• A0 final  A0 preliminary,
  
• 21jun10.
• z=0,src:J1330+251(row.col:1.1-20.14), J1609+264(r,c:20.16-end)
• A0 super fine grid
•  19aug10
• z=10 ,J0321+123 (1.1- 22.17) ,J0502+252(22.18 ->end)
• rcvr chain 1,2,3,4->1,2,3,20
  
• A1 final  A1preliminary
• 21jun10
• z=0,src:J1609+264(r.c:1.1 - 6.30), J1840+097(r.c:6.30-21.31),J2014+235(r.c:22.1-end)
• note that 2nd source redid point row6,col 30 so this point is in the end of the first and start of the 2nd files.
• A1 super fine
• 20aug10,23aug10
• z=10,J2015+235(1.1 to 23.9),J0221+123(23.10 to 28.28) never finished
• rcvr chain switch: dipoles 1,2,3,4->17,18,19,20
  
• A2 (this is the dual pol array data)
  
• 24jun10 old antenna
• J2014+235 (1.1 to 20.3),J2323+250 (20.4 to 26.8) restarted (26.9 to..) lots of short files old
• 25jun10 new dual pol antenna z=-2.5cm
• J2014+234 (1.1 to 21.5), J2123+250 (21.6 to end)
• A2
• 20aug10
• z=10,J1640+123(1.1-12.13),J1758+134(12.14-29.13),J1845+098)(29.14-31.31)
• rcvr chain dipoles 1,2,3->1,2,3 before switch
  
• A3 final  A3 preliminary
  
• 21jun10
  
• z=0, src:J2123+250(r.c:1.1-16.25),J2253+161(r.c:16.26-23.27),J2253+161(r.c:23.27-28.21)
• J2253.161 has two sets since it went into the keyhole
• 23.27 was redone since it was a short file on the byu computer.
• A3
• 23aug10,26aug10 z=10
• 23aug10: single pol array J0502+252(1.1-15.31), rcvrChain, 1,2,3,4->1,2,3,20
  
• 26aug10:dual pol array, 20 channel system:       ,rcvrChain , 1,2,3,4->17,18,19,20
  
• A4
  
• 22jun10,23jun10
  
• J1330+251 (1.1 to 21.1), J1330+251 (21.2 -> end) z=0
• A4
• 25aug10:J0502+252(1.1-20.31)
• 26aug10:J2232+117(21.1-30.25),J2340+223(30.26-31.31)
• dual pol array 20 channel system. rvrchain:1,2,3,4->17,18,19,20
  
• A5 final
• 23jun10
  
• z=0, src:J1330+251 (1.1->10.3),J2014+234(10.4->30.19),J2123+250(30.20->31.31)
• A5
• 25aug10
• J2232+117(1.1-8.24),J2350+223(8.25-24.8),J0129+236(24.9-31.31)
• dual pol array, 20 chan system. rcvr 1,2,3,4->17,18,19,20
  
• A6
• 23jun10
• J2123+250 (1.1 to 12.25), J2232+117 (12.26 to 26.20), J2253+161(26.21 to end)
• A6
• 25aug10 rcvrchain 1,2,3,4->17,18,19,20
• J0129+236(1.1-14.16),J0318+164(1417-31.31)
• 
  
• A0-A6 combined Jun10 data (preliminary)
  
• 20Meter sensitivity map:

15x15 fine grid sensitivity maps: (top)

• A0 using 40 channel system and single pol antenna
• 19aug10
• foc=-7.5 cm, J2133+250 (no last cal)
  
• A0 using 40 channel system dual pol
• 24aug10 afternoon (J1609+266) phase cal cable replaced.
• foc=-5+2.5=-2.5cm
  
• C1
• 26aug10
• J2232+117 (7.2 Jy).
  
• Central pixel using AO system (.gif)
• the offsets are telescope offsets, sky offsets are minus this
• C2
• 26aug10
• J0318+164 (7.7 Jy) (1.1 to 13.12 then ran out of time). not a complete grid.
  
• Central pixel using AO system (.gif)
• the offsets are telescope offsets, sky offsets are minus this
• this has a pretty good offset..didn't have time to do crosses before hand.
  
• C5
  
• 19aug10
• J2340+223 (1.9jy)
  
• Central pixel using AO system (.gif)
• the offsets are telescope offsets, sky offsets are minus this
• C6
• 25aug10
• J2123+250 (10.34 Jy)
  
• Central pixel using AO system (.gif)
• the offsets are telescope offsets, sky offsets are minus this
• C7
• 25aug10
• J2232+117  (7.2 Jy)
  
• Central pixel using AO system (.gif)
• the offsets are telescope offsets, sky offsets are minus this
• D1
  
• 26aug10
• J0318+164  (7.7 Jy)
  
• Central pixel using AO system (.gif)
• the offsets are telescope offsets, sky offsets are minus this
• D5
• 19aug10
• J0129+236 (2.46Jy)
• Central pixel using AO system (.gif)
• the offsets are telescope offsets, sky offsets are minus this
• D6
• 19aug10
• J0129+236 2.46 Jy
• Central pixel using AO system (.gif)
• the offsets are telescope offsets, sky offsets are minus this
• D6
• 26aug10 updated sky offsets positions from 19aug10 data
  
• J2123+250 10.34 Jy
• Central pixel using AO system (.gif)
• the offsets are telescope offsets, sky offsets are minus this

7x7 grids at locations A0-A6 for focus=-8,0,10,20. Sensitivity maps  (top)

• focus=-8 (.pdf)
  
• 19-20jun10. Source J2232+114(A0,A4,A5,A6,A1,A2  J2253+161(A3)
• focus=0
• 18-19jun10. Source J2123+250(A0,A4,A5,A6,A1,A2 J2253+1161 (A3)
• focus=10
• 19-20jun10. Source J1347+122(A0,A4,A5,A6,A1) J2014+235(A2,A3)
• focus=20
• 19-20jun10. Source J2014+234 (A0,A4,A5) J2123+250(A6,A1,A2,A3)

Z focus scan results

• 18-19jun10 (.pdf). -10 to +28 cm in 2cm steps. 4 secs on , 4secs off at each position
• J1758+134(A0,A1)
  

BEAM PATTERNS

• JUN10 8x8 thumbnails of beam pattern (db scale) (.pdf)

Extended sources

• 18jun10 - W51 A0 foc=-8. 5x5 grid with 7.5 amin spacing
• 24jun10 -
  
• M87 3 5x5 wide grids (7.5 amin steps) evening
  
• At least 1 short file in each 5x5 grid.
• 8x8 preliminary image (.pdf)
  
• W51 5x5 wide grid. foc=0, pos=A0, step 7.5 amin
• short files
• 25jun10: W51 A0, polA (dual pol antenna)
• 3 grids but all had short files. (see log).
• 26aug10: crab. foc=-5cm. 5x5mosaic 7.5 amin setsp, 4sec per point. cal at end each row.
  

Weak sources:

• 21jun10. foc=0. 5 1.5 amin steps in az
• J1539+142 . 2 horizontal strips 40 secs/pnt
• J1538+147. 12 mJy. 2 hor strips 40 secs/pnt
• 26aug10: J0319+141 (35 mJy@1405Mhz). foc=-5cm. (see log).
  

Frequency Scan

• 21jun10:
•  1200 to 1900 in 20 Mhz steps. J1758+097. foc=0. pos=A0.
• 1210 to 1910 in 20 Mhz steps. On and off at each freq.

Absorber:

• 26aug01
  

History  (top)

equipment/software changes changes  (top)

• 25aug10: after C6 grid updated C6 position (fine grid taken with old position).
  
• 25aug10: added line drivers to 40 chan trigger inputs.
  
• 24aug10: afternoon, replaced bad phase cal cable going to 40 chan system.
  
• 24aug10: pm added C7 position for fov check
  
• 23aug10: increased phase cal amplitude.
  
• 23aug10: switched to dual pol array.
  
• 20aug10: switched receiver chain 1,2,3, <->17,18,19
  
• 16aug10:
• Updated positions for A1-A6 using crosses taken 21jun-25jun. Also updated the modelBYU for A0. These changes were 0 to about 25 asecs..
  
• 25jun10: day
  
• switched to dual pol antenna,
• switched drives from spare computer to byu20meter drive F:
  
• 24-25jun10: short files all night, no good data
  
• 21-22jun10: modified mapping,focus routines to update az,za offset a la rick fischer (only done at start of each 4 sec integration).
  
• 19jun10: updated xytosky mapping file after the crosses were done.
  
• 13may10: added srclisting with rise,set times. Also added observing plan version 4.
  
• 10may10: start command from ao to byu now includes elOff azOff ra dec seqnumber.

Super fine grids 31x31 done  (top)

• 21jun10:A0,A1,A3
• 22jun10: A4 (r.c:1.1 - 21.1)
• 23jun10: A4 finished. A5,A6 completed
• 24jun10: trouble with byu system completed A2 with 40 short files..
  
• 25jun10: tried A2 with dual pol array using pola. had about 45 short files.

• Aug10
• A0: foc=7.5+2.5=10cm
  
• 19aug10: single pol array, 20 chan system
  
• A2: foc=7.5+2.5=10cm
• 20aug10, single pol array, 20 chan system
  
• Switched rcvr chain 1,2,3 <--> 17,18,19
  
• A1: foc=7.5+2.5=10cm
  
• 20aug10: 23aug10 single pol array, 20 chan system
• A3: foc=7.5+2.5=10cm
• 23aug10: single pol Array, 20 chan system rows 1.1 to 15.31
• 23aug10: dual pol array installed.
• 23aug10: dual pol array, 40 chan system rows (16.1 to 28.31)
  
• 24aug10:dual pol array, 40 chan system, (29.1 to end)
• 26aug10:dual pol array, 20 chan system (16.1 to end)
• redid the 40 chan data on 26aug10
  
• A4: foc=7.5+2.5=10cm
• 24aug10:dual pol array, 40 chan system (1.1 to 13.19)
• did not complete.. redone on 25,26aug10.
  
• 20 chan system with dual pol array
  
• A5: foc=7.5+2.5=10cm
• 25aug10: dual pol array, 20 chan system
• A6: foc=7.5+2.5=10 cm
• 25aug10: dual pol array, 20 chan system
• A4: foc=7.5+2.5=10cm
• 25aug10: dual pol array, 20 chan system (1.1 to 20.31)
• 26aug10: dual pol array, 20 chan system (21.1 to end)
  

Fine grids done (15x15) done (top)

• A0: foc=-7.5+2.5=-5cm
• 19aug10: single pol array, 40 chan system, no last cal
• A0: foc=-7.5+2.5=-5cm
• 19aug10: single pol array, 20 chan system
• C5: foc=7.5+2.5=10cm
• 19aug10:single pol array, 20 chan system
• D5: foc=7.5+2.5=10cm
• 19aug10:single pol array, 20 chan system
• D6: foc=7.5+2.5=10cm
• 19aug10:single pol array, 20 chan system
• switched rcvr chain 1,2,3 <->17,18,19
• Dual pol array installed
• A0: foc=-5 +2.5=-2.5 cm
• 23aug10:dual pol array, 40 chan system
• increased phase cal amplitude 40 chan system.
  
• A0: foc=-5 + 2.5=-2.5cm
• 24aug10:dual pol array, 40 chan system, but only recorded polB (node 2 down)
• replaced bad phase cal cable in 40 chan system.
  
• A0: foc=-5+2.5=-2.5cm
• 24aug10:dual pol array, 40 chan system
  
• C6: foc=7.5+2.5=10cm
• 25aug10: dual pol array, 20 chan system.
  
• C7: foc=7.5+2.5=10cm
• 25aug10:dual pol array, 20 chan system.
• this position is in the direction of C5 by about 10cm closer to paraxial ray.
• Added line drivers to 40 chan trigger inputs
  
• A0: foc=-5+2.5=-2.5 cm
• 25aug10: dual pol Array, 40 chan system.
• D6: foc=7.5+2.5=10cm
• 26aug10: dual pol array, 20 chan system
• updated telescope offsets positions from 19aug10 D6 array.
• C1: foc=7.5+2.5=10cm
• 26aug10: dual pol array, 20 chan system
• D1: foc=7.5+2.5=10cm
• 26aug10:dual pol array, 20 chan system
• C2: foc=7.5+2.5=10cm
• 26aug10: dual pol array, 20 chan system
• A0: foc=-5 + 2.5=-2.5 cm
• 26aug10: dual pol array, 40 chan system (polarized 7% source)
• completed thru (row 15, point 10 then byu system stopped.. ran out of time).
  

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