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.