| Antenna No. |
Q SN No. |
Gain curves |
Status |
| ANT 1 |
Q 15
(Q 25) |
|
--nov02 -- Rx successfully reinstalled.
--aug02 -- Rx pulled, LNAs not working.
8mar02 -- latest news on AN1 is that the problem indeed are in the subreflector.
27dec01 -- Receiver
swapped with rx Q 15 in AN19 in order to investigate the low and
variable gains. Results: Problems stay with AN1; likely antenna optics
problem. The receiver at AN1 is now Q 15.
04apr01 -- There are intermittent dropouts in the
Q band data. This may be due to a poor subreflector surface which is more
obvious now that the surface has been adjusted based on K-band holography.
More tests are being run to isolate the problem and determine best way
to solve it. If you see dropouts in the data -- it is best to flag the
affected times.
17nov00 -- The problem is solved. Greg replaced numerous cables, the amplitudes
are a factor of about 2 lower than the best performing antennas. This is
reasonable considering that the dish has not been optimized with Q band
holography yet. No sign of shorting when antenna is tipped.
10nov00 -- latest data shows receiver is OK. But amplitudes are still bad.
Difficult to track down. Something might be shorting when the antenna is
tipped.
01nov00 -- Amplitudes low by a factor of 4 to 5 still. It should be better.
Back to the drawing board.
30oct00 -- Found water leaking onto front end electronics (F-rack) when
antenna was tilted. Water got into the coax -- probable cause of bad data.
Coax was dried out.
29oct00 -- Data still bad, must delete all data for this ant.
20oct00 -- 7 mm phases highly unstable (all IFs), Rx temp OK but data is
not.
28oct00 -- To = 50-60 K
20oct00 -- Pointing optimized. Receiver looks OK now.
18oct00 -- new rx installed. Still needs to
have pointing optimized. Amplitudes are low, probably due to poor pointing.
Antenna history file.
|
| ANT 2 |
Q 26 |
|
may01 -- Panel adjustments are being made using results from Q-band holography.
05dec00 -- To = 50 K, nice receiver performance.
01dec00 -- New rx installed.
30oct00 -- panel readjustment scheduled completion date.
Antenna history file.
|
| ANT 3 |
Q 8 |
ps |
16mar00 -- To = 100 K
Antenna history file.
|
| ANT 4 |
Q 1 |
ps |
01may01 -- The receiver is fixed.
04apr01 -- It appears that there is serious micro phonics oscillations in
the rx hardware in the dewar. This may be the root cause of the RCP dropouts.
The waveguide is solid, not flex (which is subject to micro phonics). This
indicates that an actual connection is bad in the dewar. The rx will have
to be brought back to the lab to be fixed.
20mar01 -- Still looking for the cause of the RCP dropouts. Problem is
intermittent.
12feb01 -- RCP is now alive but there are dropouts in the signal.
04feb01 -- RCP IFs A & B are dead.
31jan01 -- To = 80-90 K, RCP & LCP look OK.
25oct00 -- To = 100 K
18oct00 -- Receiver installed with a new amplifier.
07sep00 -- Tsys fluctuating, fringe amplitudes intermittent. Remove receiver
from antenna for repair
16mar00 -- To = 100 K
Antenna history file.
|
| ANT 5 |
Q 23 |
ps |
21mar01 -- Full check out complete. Pointing accuracy is now good (see
Chris Carilli's page for pointing test results). This rx should be excellent
for Q band operations again.
22feb01 -- Antenna back to the array for checkout.
27nov00 -- Antenna in the Barn for overhaul, scheduled to be finished on
13feb00.
10nov00 -- Amplitude drops to 40% nominal value every 4 minutes on a regular
cycle. The encoder must be completely rebuilt. Will be done in the Antenna
Assembly Building (Barn) when the Ant goes in for major overhaul.
28oct00 -- amplitudes still varying intermittently.
25oct00 -- F3 module was swapped out to try to fix problem.
24oct00 -- fringe amplitudes vary by > 10%. some data blanked at K and
Q bands. Rx temperature, To = 47 K on all IFs so Rx is healthy.
20aug00 -- To = 50 K, very nice.
16aug00 -- successfully installed
Antenna history file.
|
| ANT 6 |
Q 12
(Q 9) |
ps |
26feb03 -- Rx SN12 installed. A bad LCP amplifier caused a problem when this rx was in AN13, which was fixed by replacing the LNAs at both sides with new MAP style LNAs, decresing the rx temp by 15K. T_0 still a bit high.No fringes yet; delays, pointing etc needs to be set.
22dec00 -- drop out problem fixed.
09nov00 -- occasional drop outs observed in raw data on ANT6 baselines
at Q band during a run.
16mar00 -- To = 70 K
Antenna history file.
|
| ANT 7 |
Q 27 |
|
28dec02 -- Still has amplitude variations, also seen at lower frequencys but smaller amplitude.
11nov02 -- F3 module swapped in order to prevent amplitude variations.
30oct02 -- New Rx installed. Seems to have high amplitude variations on timescales of 10 seconds.
Antenna history file.
|
| ANT 8 |
Q 2 |
ps |
16mar00 -- To = 90 K
|
| ANT 9 |
|
|
22feb01 -- ANT 9 in the barn to correct the positions of the K band receiver
so a new Q band receiver can be installed. In the mean time, Q band SN
24 is installed on ANT 23.
15feb01 -- solar cal amplifier fixed by Bob Hayward.
26jan01 -- Forget it, the solar cal amplifier is unstable. It will be stripped
off the Q band receiver so the receiver can be installed without it.
22jan01 -- Solar cal is here and being installed.
jan01 -- Awaiting end-of-year delivery of repaired solar cal amp from Spacek/SW.
Expect rx installation after solar cal has been added.
Antenna history file.
|
| ANT 10 |
Q 18 |
ps |
07jun00 -- sensitivity improved after K-band template panel adjustment.
Still 30% low, will have to live with this until Q-band holography can
be done next year.
23may00 -- panel adjustments complete.
11may00 -- panel readjustment scheduled completion date to improve Q
and K band sensitivity (expect Q-band gains to be a factor of 2 low until
panel adjustment is complete).
16mar00 -- To = 50 K LCP & 85 K RCP
05jan00 -- To = 45 K LCP & 85 K RCP (big spread due to amplifier response).
Antenna history file.
|
| ANT 11 |
Q 5 |
ps |
10nov00 -- data looks good here.
10oct00 -- Rotation correction adjusted to give something reasonable.
25sep00 -- Subreflector rotation correction with elevation wrong for ANT
11 at Q band. This caused pointing errors that changed with elevation.
11sep00 -- gains low and unstable
16mar00 -- To = 70 K
Antenna history file.
|
| ANT 12 |
Q 9
(Q 13) |
ps |
16mar00 -- To = 60 K
|
| ANT 13 |
Q 13
(Q 12) |
ps |
07nov02 -- Rx pulled, taken to AOC to fix a 2-3 times higher AB
Tsys than CD. Instead rx Q, SN13 for AN12 (in the AAB) was
installed.
16mar00 -- To = 45 K
Antenna history file.
|
| ANT 14 |
Q 6 |
ps |
20sep02 -- Rx pulled due to noisy and intermittent signal at IFs CD.
16mar00 -- To = 45 K LCP & 85 K RCP
05jan00 -- To = 45 K LCP & 85 K RCP
Antenna history file.
|
| ANT 15 |
Q 27 |
|
26feb03 -- New rx SN27 installed. T_rx around 30K. T_0 shows around 50K at startup. No fringes yet; delays, pointing etc needs to be set.
No Q-band receiver yet.
Antenna history file.
|
| ANT 16 |
Q 7 |
ps
|
17nov00 -- Discovered that the antenna beam is deforming
somewhat at elevations below 20deg. Measured flux decreases significantly
at these elevations. Expect poor performance at low elevations.
16mar00 -- To = 90 K
Antenna history file.
|
| ANT 17 |
Q 22 |
|
11jul00 -- K band template panel adjustment complete.
30jun00 -- To = 60 K -- looks nice.
29jun00 -- new Rx installed
|
| ANT 18 |
Q 17 |
ps |
19feb03 -- CD X/Q bandswitch replaced, and wet coax connector dried. This was done to fix high Tsys at IFCD.
03may01 -- Panel adjustments made using results from Q-band holography.
04apr01 -- Amplitudes are also low by almost a factor
of 2. This could be due to a poor surface. Surface panel adjustments based
on Q-band holography measurements will be completed within the next few
weeks (subject to wind constraints) to determine if surface accuracy or
dropouts are the cause of the low power.
04apr01 -- There have been reports of intermittent
dropouts in the rx power. Bob Hayward is running tests to see if micro phonics
oscillations are the culprit. If you see dropouts in the data -- it is
best to flag the affected times.
16mar00 -- To = 60 K
Antenna history file.
|
| ANT 19 |
Q 25
(Q 15) |
ps |
27dec01 -- Swapped receiver with AN1 in order to clarify the problems with
AN1. The receiver at AN19 is now Q 25.
30may00 -- pointing OK
17mar00 -- up to 20" sinusoidal pointing variations over 5-10 min timescales.
16mar00 -- To = 70 K
Antenna history file.
|
| ANT 20 |
Q 14 |
|
17feb03 -- replaced LO bandswitch, since it was stuck in one position.
16mar00 -- To = 75 K
01feb00 -- Antenna out of the barn and being checked out for operations.
jan00 -- Antenna in the barn for maintenance.
Antenna history file.
|
| ANT 21 |
Q 16 |
ps |
17nov00 -- Discovered that the antenna beam is deforming
significantly at elevations below 20deg. Expect poor performance at low
elevations.
30may00 -- pointing OK
17mar00 -- up to 20" sinusoidal pointing variations over 5-10 min timescales.
16mar00 -- To = 70 K
09feb00 -- amps down by up to a factor of 2: Holography shows panel adjustments
required.
Antenna history file.
|
| ANT 22 |
Q 11 |
ps |
jul02 -- Antenna have not been fringing at Qband for a while. F3 and F12 modules were swapped, antenna is now fringing again,
25oct00 -- problem found, bias adjusted, rx looks OK again
19oct00 -- Q-band RCP (A/B) is still bad. May be a loose wire in the amplifier.
Engineers are working on the problem.
04oct00 -- Q-band RCP (A/B) is intermittently bad. Data must be deleted
if Tsys is high.
16mar00 -- To = 75 K
Antenna history file.
|
| ANT 23 |
Q 24 |
|
01mar01 -- new Q band receiver installed. Initial
tests look good. This receiver has a solar cal on it -- Solar observations
are now possible at Q band. The solar cal still needs to be tested.
17nov00 -- Discovered that the antenna beam is deforming
significantly at elevations below 20deg. Expect poor performance at low
elevations.
26jul00 -- K band template panel adjustment complete.
|
| ANT 24 |
Q 19 |
ps |
26mar02 -- Panel adjustments were completed (from Q-band holography).
08jun00 -- K band template panel adjustment complete.
16mar00 -- To = 70 K
13jan00 -- Ken S. determined better pointing solution.
05jan00 -- To = 60 K
Antenna history file.
|
| ANT 25 |
Q 4 |
ps |
22dec00 -- Tests show that X-band reference pointing is performing well
now.
13dec00 -- Swapped out the X-band receiver.
01dec00 -- New X band receiver is being built to replace bad one.
22nov00 -- X-band rx has a bad FET ==> reference pointing will not work
for Q band observations. Expect amplitudes to be low, you will probably
have to flag this antenna.
10nov00 -- receiver and amplitudes look nominal. All OK.
01nov00 -- cals and fringe amplitude intermittently 0 at Q band std frequencies
(43.315 & 43.365 GHz), fixed.
16mar00 -- To = 80 K
Antenna history file.
|
| ANT 26 |
Q 21 |
ps |
01jun00 -- To = 55 K; new rx looks good.
23may00 -- New receiver installed successfully.
31jan00 -- Antenna to the barn for maintenance.
Antenna history file.
|
| ANT 27 |
Q 3 |
ps |
16mar00 -- To = 100 K
Antenna history file.
|
| ANT 28 |
Q 20 |
ps |
15jun00 -- K band template panel adjustment complete.
23jun00 -- Panel adjustment scheduled for 23jun00. (expect gains to be
a factor of 1.5-1.8 low until panel adjustment is complete)
16mar00 -- To = 65 K
15feb00 -- To = 60 K --receiver looks great
02feb00 -- New receiver installed. Chantal McPherson,
from Cibola High School in Albuquerque helped to install the receiver.
14jan00 -- Rx being assembled, all parts in, relay rack and modified F3
are ready to go.
Antenna history file.
|
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