New Allen Telescope Array Development

doing the dishes…

The basic health of a feed is currently determined by the phase rms as measured on the A and C correlators during a weekly “array health” correlator observation. Another indicator is the cryotemp.

phase rms:

Command: ahcheck.py --attr prms-a,prms-c -a 2b,3l,2e,1e,2a,2m,1h,1k,2h,4j,2j,3d -f all --fmt csv 
 [0.00001,2.0],     #EXCELLENT
 [2.00001,5.0],     #GOOD
 [5.00001,10.0],    #MARGINAL
 [10.00001,300.0]   #POOR

cryotemp:

Command: ahcheck.py --attr cryotemp -a 2b,3l,2e,1e,2a,2m,1h,1k,2h,4j,2j,3d  --fmt csv 
[0.0,59.99],     #TOO LOW
[60.0,65.0],     #EXCELLENT
[65.01,75.0],    #GOOD
[75.01,150.0],   #MARGINAL
[150.01,400.0]   #POOR

ant1j                        down  elin              2017-04-06 12:00:00  both az/el encoders fine. relay card bad. replaced. Still has no feed however
ant2g                        down  elin              2017-04-28 08:36:34  (maint) removed rfcb-018 to use in 4j
ant3f                        down  elin              2013-07-31 15:24:55  removed control box, powered off
ant3g                        down  elin              2013-07-31 15:25:06  removed control box, powered off
ant3h                        down  elin              2013-07-31 15:25:14  removed control box, powered off
ant4f                        down  elin              2016-09-13 10:54:02  removed control box (to install in 1a). Leave ant in nofeed group
ant4h                        down  elin              2017-02-02 10:52:25  (maint) both lnas have gone bad

The 16 new feeds are on antennas: 1c,1e,1g,1h,1k,2a,2b,2e,2h,2j,2m,3c,3d,3l,4j,5b

The 6 antennas with no feeds (or missing other parts - not yet 100% clear) are: 1j,3f,3g,3h,4f,4h

The 19 antennas with rev 1 feeds *and* cryo readings are: 1a,1b,1d,1f,2c,2d,2f,2k,2l,3e,3j,4e,4g,4k,4l,5c,5e,5g,5h

The 1 rev 1 antenna with *unreachable* cryo is: 2

• A description of how the feeds are tested each week, see Feed Testing
• Feed control commands document

• Notes page
• Install date: 2017-12-06
• SN: 5C4-002
• Noisy - wobbling bearing sound from behind vacuum box. Needs new diaphragm pump. Can be repaired on site by Minex.
• Cryotemp: 66.3

• Notes page
• Install date: 2017-06-14
• SN: 5C4-013
• NOTE: 1h is not hooked up to fxa
• Cryotemp: 70.1

• Notes page
• Install date: 2017-06-14
• SN: 5C4-012
• Cryotemp: 67.0

• Notes page
• Install date: 2015-10-23
• SN: 5C4-005
• Cryotemp: 65.2

• Notes page
• Install date: 2016-01-28
• SN: 5C4-010
• NOTE: not hooked up to fxa
• Cryotemp: 71.7

• Notes page
• Install date: 2015-10-23
• SN: 5C4-004
• NOTE: Not hooked up to fxc
• Cryotemp: 70.0

• Notes page
• Install date: 2016-01-28,
• SN: 5C4-009
• NOTE: Not hooked up to fxa
• Cryotemp: 78.0

• Notes page
• Install date: 2017-06-13
• SN: 5C4-014
• Cryotemp: 69.0

• Notes page
• Install date: 2017-06-13
• SN: 5C4-015
• NOTE: Not hooked up to fxc
• Cryotemp: 68.0

• Notes page
• Install date: 2017-06-15
• SN: 5C4-017
• Cryotemp: 71.8

• Notes page
• Install date: 2015-12-16
• SN: 5C4-011
• Noisy - wobbling bearing sound from behind vacuum box. Needs new diaphragm pump. Can be repaired on site by Minex.
• Cryotemp: 65.0

• Notes page
• Install date: 2017-12-06
• SN: 5C4-006
• Cryotemp: 65.0

• Install date: 2015-10-23
• SN: 5C4-007
• STATUS: DOWN
• 2017-09-25 sent back to Minex for repair: cryo cooler/pump unit still not working properly even after change

• Install date: 2015-12-16
• SN: 5C4-008
• STATUS: DOWN
• 2017-12-19 (maint) iced over. 24h roughing pump did not clear. Feed turned off. Needs to be looked at by Minex Minex.

• Install date: 2017-06-13
• SN: 5C4-016
• STATUS: DOWN
• 2018-02-07 Feed lost vacuum/shut off

• Install date: 2015-08-15
• SN: 5C4-003
• STATUS: DOWN
• 2018-02-07 (maint) 24V ps died. Replaced. Roughing pump not coming up.

There is a great script that uses the results of the latest correlator array health obs and allows you to sort the antenna pols from best to worse.

The available frequencies are 1430, 3040, 4500, 6667, 8400, 10000

Run from: obs@tumulus:~/elin/arrayhealth/ah/progs

bestantpols.py -f 1430 --details --attr prms-a,prms-c
bestantpols.py -f 1430 --details --attr tsys-a,tsys-c
bestantpols.py -f 1430 --details --attr prms-a,prms-c,tsys-a,tsys-c