AO19 phased array feed

apr 2013


Topics

Pre installation:
Sources
History of what we did
Results
Misc:



Pre installation:

     

Sources:  (top)


  Strong lband calibration sources available:

Source
Cat
Flux Jy
 Notes


1400
1665

point src calibrators
J0108+133
N
12.05
10.31
maj,min :18.1,<16.2 .. chris say 4' size?
J0137+331 (3C48)
C
15.77
13.67
This transits @noon around 19apr10. freq @ 1665
J0318+164 (CTA21)
C 7.85
7.17

J0437+296(3C123) N 54.9
maj,min 27.7,<18
J0502+252 N 5.7

maj,min  , 15.4,<18.5
J0521+166 (3C138)
C 9.22
8.27
8% polarized @ 1665
J1229+020 (3C273) N
54

maj,min 21.5,<15.9
J1331+305 (3C286)
C 14.55
13.32
9% polarized @1600MHz.
J1330+251 (3C287)
N 6.93
6.26
maj,min  < 16.0 < 15.55
J1347+122 N 5.41
5.02
maj,min <18.2 < 17.1
J2014+23 (3C409) N

11.23
maj,min 21,<14.8 (at 1665MHz via chris salter).
J2123+250 (3C433)
N
10.27

maj,min 19,<13.9 (chris says 2')
J2232+117
N
7.2

maj,min <19,<17
J2253+161 (3C454.3) C 13.16
13.34
This is a variable. Strength probably different.
extended sources
J0534+22(crab)
N
324

maj,min 127,127
053428.03 +2202 02.5
M87 (.25 deg) image
M87 (.25 deg) contour map: (.ps) (.pdf)
123049.46 122321.6
N 138

maj,min 48.4 18.7
J1648+0504 (3C348) Hercules A

47

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
192342.51 143031.1
 (W51 image .5 deg square)
W51 contour map (.ps) (.pdf)
N 36.8

maj,min 83.9,63.7
B2018+295 (3C410)
C 8.65

size:41 arc secs
B2121+248 (3C433)
C 10.63

size 120 arc secs





J1538+147 (.ps) (.pdf) contour map
N
.012

12 mJy (peak) nvss source . 40 sec integrations.

Source ra,dec, flux and AST rise times  (top)


  processing:x101/ao19/sources/srcsched.pro


Ip addresses  (top)

The ip addresses, gateways to use:



arduino cal ctrl  (top)

    There is a cal multiplexor in the Cornell rack on the rotary floor. It selects which dipole will receiver the cal rf signal (from the noise diode)



byu documentation


20jun13 weight on rotary floor  (top)

    The weights on the turret floor for the jul13 experiment are:

equipment
weight (lbs)
notes
dewar
400
495 with mount - 95 lbs of mount
weighted in xmter room.
dewar mount
40
guess by steve
Cornell rack
450lbs
weighed in transmitter room.(450)
includes most cables/
byu rack
195 lb
weighed in xmter room
no cables
total
1085bs


rcv
weight (lbs)
notes
sbh
150
denis weighed it in lab
cbh
250

800
85
just used value from old 610 system
probably light since we have refrig
sbw
244

cb
254

total
983

    So we will be adding 102 lbs extra to the floor.


Other:

 

Results: 

BYU plots/images (top)


25-29jul13:Calibration run results: (top)

    x102 calibration scans were done using ao19. The cal never worked so there is no Gain or Tsys value. We tried various setups:

    The plots show the calibration results (.ps) (.pdf)

summary:

processing: x101/1307..25,26,27,29/ao19x102.pro, x101/projects/ao19/procdata/x102dat.pro

30jul13: scans across the moon with ao19 and lbw using ao system. (top)

    On 30jul13 scans were done across the moon. Data was taken at 1400 MHz.

The plots show the results of scanning across the moon on 30jul13 (.ps) (.pdf):

Summary:

processing: x101/projects/ao19/procdata/moon30.pro


03aug13: yfactors, sefd @ 1400 & 1665MHz (top)

    On 03aug13 on,offs were done on source J0603+219 (B0600+219):

The plots show  the results of the on, offs (.ps)  (.pdf)

SUMMARY:

    The table shows the yfactor and sefd results.

Freq
MHz
Measurement
Source
Yfactor
SEFD
1400
ao
1.22
1.23
12.23
11.70
byu
Unformed beam
1.26
1.22
10.34
12.23
byu formed
beam
1.39
1.36
6.90
7.47
1665
ao 1.37
1.28
6.59
8.71
byu
Unformed beam
1.40
1.31
6.10
7.87
byu formed
beam
1.51
1.38
4.78
6.42

processing: x101/130803/ao19.pro


03aug13: Byu system: yfactors, Tsys on moon. (top)

 
  We did on/offs on the moon at 1400 and 1665 MHz with the byu system. The yfactor was then computed for each beam. 

The plots shows jay's yfactors with bad beams removed (.pdf)

The second plot showsTsys for various moon yfactors (.ps) (.pdf)

processing: x101/projects/ao19/procdata/tsysVsYf.pro

01,03aug13: Yfactors, tertiary skirt, moon, Ao system.  (top)

    Moon on,offs were done using the ao system :

The plots compare the results with/without the tertiary screen (.ps) (.pdf):

SUMMARY:

processing: x101/projects/ao19/procdata/moonskirt.pro

02,03,04aug13: yfactor, SEFD vs frequency (top)

    Frequency scans were done on 02,03,04 aug13 to measure the yfactor and SEFD vs frequency using the ao system. The setup was:

The plots show On/Off and SEFD vs frequency  (.ps) (.pdf):

SUMMARY:

processing: x101/projects/ao19/procdata/freqscan.pro

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