hba sensitivity problems
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HBA sensitivity problems
M.A. Brentjens
Radio ObservatoryASTRON, Dwingeloo, The Netherlands
February 8, 2012
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 1 / 50
Outline
1 HBA sensitivity problems
2 One faulty RSP board
3 Two faulty RSP boards
4 Two faulty RSP boards
5 What can holography do?
6 Now what?
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 2 / 50
L44551 3C295
CS001HBA0 CS001HBA1
CS002HBA0 CS002HBA1
CS003HBA0 CS003HBA1
CS004HBA0 CS004HBA1
CS005HBA0 CS005HBA1
CS006HBA0 CS006HBA1
CS007HBA0 CS007HBA1
CS013HBA0 CS013HBA1
CS017HBA0 CS017HBA1
CS021HBA0 CS021HBA1
CS024HBA0 CS024HBA1
CS026HBA0 CS026HBA1
CS028HBA0 CS028HBA1
CS030HBA0 CS030HBA1
CS031HBA0 CS031HBA1
CS032HBA0 CS032HBA1
CS101HBA0 CS101HBA1
CS103HBA0 CS103HBA1
CS201HBA0 CS201HBA1
CS301HBA0 CS301HBA1
CS302HBA0 CS302HBA1
CS401HBA0 CS401HBA1
CS501HBA0 CS501HBA1
RS106HBA RS205HBA
RS208HBA RS306HBA
RS307HBA RS406HBA
RS503HBA
0 500 1000 1500 2000 2500 3000 3500 4000Time [s]
RS508HBA
0 500 1000 1500 2000 2500 3000 3500 4000Time [s]
RS509HBA
/data/L44551/L44551_SAP000_SB217_uv.MS: abs(vis) with CS002HBA0 at 157.42 MHz
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 3 / 50
L44650 3C295, CS501& RS306 PPS tuned
CS001HBA0 CS001HBA1
CS002HBA0 CS002HBA1
CS003HBA0 CS003HBA1
CS004HBA0 CS004HBA1
CS005HBA0 CS005HBA1
CS006HBA0 CS006HBA1
CS007HBA0 CS007HBA1
CS013HBA0 CS013HBA1
CS017HBA0 CS017HBA1
CS021HBA0 CS021HBA1
CS024HBA0 CS024HBA1
CS026HBA0 CS026HBA1
CS028HBA0 CS028HBA1
CS030HBA0 CS030HBA1
CS031HBA0 CS031HBA1
CS032HBA0 CS032HBA1
CS101HBA0 CS101HBA1
CS103HBA0 CS103HBA1
CS201HBA0 CS201HBA1
CS301HBA0 CS301HBA1
CS302HBA0 CS302HBA1
CS401HBA0 CS401HBA1
CS501HBA0 CS501HBA1
RS106HBA RS205HBA
RS208HBA RS306HBA
RS307HBA RS406HBA
RS503HBA
0 1000 2000 3000 4000 5000 6000 7000 8000Time [s]
RS508HBA
0 1000 2000 3000 4000 5000 6000 7000 8000Time [s]
RS509HBA
/data/L44650/L44650_SAP000_SB219_uv.MS: abs(vis) with CS002HBA0 at 157.81 MHz
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 4 / 50
5 ns quantization CS013 HBA0 X M. Eikelboom
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 5 / 50
5 ns quantization CS013 HBA1 X M. Eikelboom
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 6 / 50
Other evidence
Gains appeared to be quantized at 157 MHz at 30–35% and60–70%.Gains for some stations fluctuated wildly between observations(Ger de Bruyn).Previous problems with PPS synchronization.Superterp does not show this issue at all. Very stable.
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 7 / 50
Outline
1 HBA sensitivity problems
2 One faulty RSP board
3 Two faulty RSP boards
4 Two faulty RSP boards
5 What can holography do?
6 Now what?
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 8 / 50
RSP delays 5, 0, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
120.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 9 / 50
RSP delays 5, 0, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
125.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 10 / 50
RSP delays 5, 0, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
130.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 11 / 50
RSP delays 5, 0, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
135.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 12 / 50
RSP delays 5, 0, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
140.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 13 / 50
RSP delays 5, 0, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
145.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 14 / 50
RSP delays 5, 0, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
150.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 15 / 50
RSP delays 5, 0, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
155.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 16 / 50
RSP delays 5, 0, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10m
[deg]
160.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 17 / 50
RSP delays 5, 0, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10m
[deg]
165.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 18 / 50
RSP delays 5, 0, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10m
[deg]
170.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 19 / 50
RSP delays 5, 0, 0, 0, 0, 0 ns
505l [deg]
5
0
5
m [
deg]
175.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 20 / 50
Outline
1 HBA sensitivity problems
2 One faulty RSP board
3 Two faulty RSP boards
4 Two faulty RSP boards
5 What can holography do?
6 Now what?
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 21 / 50
RSP delays 5, 5, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
120.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 22 / 50
RSP delays 5, 5, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
125.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 23 / 50
RSP delays 5, 5, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
130.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 24 / 50
RSP delays 5, 5, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
135.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 25 / 50
RSP delays 5, 5, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
140.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 26 / 50
RSP delays 5, 5, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
145.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 27 / 50
RSP delays 5, 5, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
150.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 28 / 50
RSP delays 5, 5, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
155.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 29 / 50
RSP delays 5, 5, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10m
[deg]
160.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 30 / 50
RSP delays 5, 5, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10m
[deg]
165.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 31 / 50
RSP delays 5, 5, 0, 0, 0, 0 ns
1050510l [deg]
10
5
0
5
10m
[deg]
170.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 32 / 50
RSP delays 5, 5, 0, 0, 0, 0 ns
505l [deg]
5
0
5
m [
deg]
175.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 33 / 50
Outline
1 HBA sensitivity problems
2 One faulty RSP board
3 Two faulty RSP boards
4 Two faulty RSP boards
5 What can holography do?
6 Now what?
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 34 / 50
RSP delays 0, 0, 5, -5, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
120.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 35 / 50
RSP delays 0, 0, 5, -5, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
125.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 36 / 50
RSP delays 0, 0, 5, -5, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
130.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 37 / 50
RSP delays 0, 0, 5, -5, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
135.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 38 / 50
RSP delays 0, 0, 5, -5, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
140.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 39 / 50
RSP delays 0, 0, 5, -5, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
145.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 40 / 50
RSP delays 0, 0, 5, -5, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
150.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 41 / 50
RSP delays 0, 0, 5, -5, 0, 0 ns
1050510l [deg]
10
5
0
5
10
m [
deg]
155.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 42 / 50
RSP delays 0, 0, 5, -5, 0, 0 ns
1050510l [deg]
10
5
0
5
10m
[deg]
160.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 43 / 50
RSP delays 0, 0, 5, -5, 0, 0 ns
1050510l [deg]
10
5
0
5
10m
[deg]
165.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 44 / 50
RSP delays 0, 0, 5, -5, 0, 0 ns
1050510l [deg]
10
5
0
5
10m
[deg]
170.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 45 / 50
RSP delays 0, 0, 5, -5, 0, 0 ns
505l [deg]
5
0
5
m [
deg]
175.00 MHz:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 46 / 50
Outline
1 HBA sensitivity problems
2 One faulty RSP board
3 Two faulty RSP boards
4 Two faulty RSP boards
5 What can holography do?
6 Now what?
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 47 / 50
15× 15 Holography sim
Beam 15x15 HBA holography phase
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 48 / 50
Outline
1 HBA sensitivity problems
2 One faulty RSP board
3 Two faulty RSP boards
4 Two faulty RSP boards
5 What can holography do?
6 Now what?
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 49 / 50
Now what?
Determine PPS delays per RSP board instead of per subrack.Rubidium pulse ill-defined? ⇒ exchange rubidiums.Attempt to detect issue at swlevel 2 initialization⇒ retry untilstarted up properly.Install modified superterp clock distribution boards elsewhere.Redetermine all mode 5, 6, and 7 calibration tables.Include PPS delay info in calibration table headers.Implement holography mode
M.A. Brentjens (ASTRON) HBA sensitivity problems February 8, 2012 50 / 50
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