| Antenna No. |
K SN No. |
Gain Curves |
Status |
| ANT 1 |
K SN 13 |
ps , gif |
19jul02 -- New Tcals entered (changed after retrofit but never
reported). This may have affected Tsys values and caused good data to
be too much down weighted.
27mar02 -- Receiver successfully re-installed. It now has 3
O-rings, ecofoam plus RTV sealant. Soida: T_rx looks good across the band, and
seems to be a good feedhorn fit. (had a blown resistor at first test)
12mar02 -- Receiver pulled for moisture problem upgrade
apr01 -- Top feed cone segment O-ring and new mylar cover installed. O-rings
in bottom two feed cone segments not installed yet.
18jul00 -- Feed cone purged. Rx temp (To) still poor wet weather.
30jun00 -- To > 100 K -- weather very wet, contamination of water in the
feed cone.
24jun00 -- To = 40 K. looks nice
17may00 -- New K band receiver successfully installed.
01mar00 -- Antenna azimuth drive problem -- in barn for maintenance.
Antenna history file.
|
| ANT 2 |
K SN 16 |
ps |
20jul02 -- Tcals have been low, adjusted in the field using LN2
as a cold load.
03jul02 -- Receiver successfully re-installed. It now has 3
O-rings, ecofoam plus RTV sealant.
26jun02 -- Receiver pulled for moisture problem upgrade
may01 -- Panel adjustments are being made using results from Q-band holography.
13dec00 -- New K band Rx 16 installed. This
rx has O-rings in all feed cone segments. We expect good, stable performance
in all weather conditions.
28jul00 -- panel readjustment scheduled completion date.
16mar00 -- To = 120 K
Antenna history file.
|
| ANT 3 |
K SN 17 |
ps |
04Sep02 -- The rx had to be pulled due to oscillating LNAs, need replacement.
24jul02 -- Receiver successfully re-installed. It now has 3
O-rings, ecofoam plus RTV sealant.
17jul02 -- Receiver pulled for moisture problem upgrade
20nov01 -- New K band receiver installed.
16mar00 -- To = 110 K
Antenna history file.
|
| ANT 4 |
K SN 20 |
ps |
25jul02 -- Tcals are mismatched between RCP and LCP, were
adjusted in the field so that the lowest values are close to 2K. Used
LN2 as a cold load.
28may02 -- SN20 now is reinstalled and works fine.
24apr02 -- New K-band receiver SN20 installed. Receiver does not cool, may be a thermal short after installation?
30jan02 -- Old K band receiver appears to have one side bad.
16mar00 -- To = 150 K
Antenna history file.
|
| ANT 5 |
K SN 2 |
ps |
19jul02 -- New Tcals entered (changed after retrofit but never
reported). This may have affected Tsys values and caused good data to
be too much down weighted.
jan01 -- New feed cone with all three O-rings installed during scheduled
maintenance.
10nov00 -- data appears to be OK
25oct00 -- F3 module swapped out. Appeared to fix K but not Q.
24oct00 -- fringe amplitudes vary by > 10%. some data blanked at K and
Q bands.
16mar00 -- To = 50 K
Antenna history file.
|
| ANT 6 |
K SN 23 |
ps |
12feb03 -- New receiver installed. First tests show fringing at 50%. Turns out to be a phase centre offset due to a slighlty different installation position. This receiver is located at the old K-band rx position, in order not to have to rebuild the doghouse twice (it will be rebuild soon for EVLA).
16mar00 -- To = 120 K
Antenna history file.
|
| ANT 7 |
K SN 18 |
ps |
31jul02 -- Receiver successfully re-installed. It now has 3
O-rings, ecofoam plus RTV sealant.
24jul02 -- Receiver pulled for moisture problem upgrade
6dec01 -- New K band receiver installed.
16mar00 -- To = 115 K
Antenna history file.
|
| ANT 8 |
K SN 21 |
ps |
21aug02 -- New K band receiver installed. Initially the subreflector were not set to the new values, was fixed on Aug 22. In terms of G/T this receiver looks like one of the best.
16mar00 -- To = 100 K RCP & 170 K LCP
Antenna history file.
|
| ANT 9 |
K SN 1 |
ps |
apr01 -- New feed cone with all three O-rings installed.
14feb01 -- ANT 9 will go into the barn briefly on 20feb01 to correct the
positions of the Q & K band receivers.
16mar00 -- To = 35 K
Antenna history file.
|
| ANT 10 |
K SN 8 |
ps |
20jul02 -- Tcals have been low, adjusted in the field using LN2
as a cold load.
19jul02 -- New Tcals entered (changed after retrofit but never
reported). This may have affected Tsys values and caused good data to
be too much down weighted.
17apr02 -- Receiver successfully re-installed. It now has 3
O-rings, ecofoam plus RTV sealant. Cooled down as it should, and worked
well during system startup.
3apr02 -- Receiver pulled for moisture problem upgrade
28mar01 -- Top feed cone segment O-ring and new mylar cover were installed.
Bottom 2 feed cone segments (in the rx shelter) were not installed.
18jul00 -- Feed cone purged. Rx temp(To) still high in wet weather.
30jun00 -- To between 60 & 90 K -- weather very wet, contamination
of water in the feed cone.
23may00 -- panel adjustments complete.
11may00 -- panel readjustment scheduled completion date.
16mar00 -- To = 35 K
Antenna history file.
|
| ANT 11 |
K SN 14 |
|
01may02 -- Receiver successfully re-installed. It now has 3
O-rings, ecofoam plus RTV sealant.
25apr02 -- Reinstallation delayed one week due to high Trec around 23 GHz seen in the lab, this has been fixed by changing the inner mylar window. Reinstallation scheduled for next week.
17apr02 -- Receiver pulled for moisture problem upgrade
apr01 -- Top feed cone segment O-ring and new mylar cover installed. O-rings
in bottom two feed cone segments not installed yet.
27july00 -- New K band Rx 14 installed -- looks OK.
16mar00 -- To = 110 K RCP & 140 LCP
Antenna history file.
|
| ANT 12 |
|
ps |
15jan03 -- LNA swapped on AB side due to bad data. Successful.
16mar00 -- To = 100 K
Antenna history file.
|
| ANT 13 |
|
ps |
16mar00 -- To = 100 K
Antenna history file.
|
| ANT 14 |
|
ps |
16mar00 -- To = 130 K
Antenna history file.
|
| ANT 15 |
K SN 19 |
ps |
30oct02 -- Noise diode swapped, fixed problem.
20oct02 -- Rx shows intermittent behaviour in Tsys, which on timescales of hours reached several 1000K and then slowly drops. Occurs on all IFs.
25jul02 -- Tcals are mismatched between RCP and LCP, were
adjusted in the field so that the lowest values are close to 2K. Used
LN2 as a cold load.
28may02 -- New K band receiver nr 19
installed -- looks OK.
16mar00 -- To = 100 K
Antenna history file.
|
| ANT 16 |
K SN 22 |
ps |
24sep02 -- Problem fixed. Turned out to be a number of reasons: delays were incorrect; the focus setting was off by 5 cm; the polarizations were swapped.
12sep02 -- New K band Rx 22 installed. Does not fringe, FE group working on the problem. Delays, subreflector positions OK. LO OK (get tip scan data as a funct. of elevation). Tsys readings OK, but no signal in to the correlator.
16mar00 -- To = 120 K
Antenna history file.
|
| ANT 17 |
K SN 11 |
ps |
17jul02 -- Receiver re-installed. It now has 3
O-rings, ecofoam plus RTV sealant. Did not fringe first due to swapped polarisations, Rudy corrected this in the morning of July 18. First attempt to reinstall was on July 10, then a LNA went bad and the receiver had to go back to the AOC.
03jul02 -- Receiver pulled for moisture problem upgrade
28mar01 -- Top feed cone segment O-ring and new mylar cover were installed.
Bottom 2 feed cone segments (in the rx shelter) were not installed.
15aug00 -- Feed cone purged. Rx temp(To) still high in wet weather.
11jul00 -- K band template panel adjustment complete.
30jun00 -- To 100-300 K -- weather very wet, water contamination in the
feed cone.
16mar00 -- To = 45 K
05jan00 -- To = 45 K -- data look great.
Antenna history file.
|
| ANT 18 |
K SN 5 |
ps |
20jul02 -- Tcals have been low, adjusted in the field using LN2
as a cold load.
19jul02 -- New Tcals entered (changed after retrofit but never
reported). This may have affected Tsys values and caused good data to
be too much down weighted.
12mar02 -- Receiver successfully re-installed. It now has 3
O-rings, ecofoam plus RTV sealant.
27feb02 -- Receiver pulled for moisture problem upgrade
03may01 -- Panel adjustments made using results from Q-band holography.
28mar01 -- Top feed cone segment O-ring and new mylar cover were installed.
Bottom 2 feed cone segments (in the rx shelter) were not installed.
04feb01 -- Receiver temp, To, jumped from 40K to 170K on all IFs in good
weather. This will cause low amps at K band. Problem temporary, not repeatable.
18jul00 -- Feed cone purged. Rx temp (To) still high in wet weather.
30jun00 -- To > 150-250 K -- weather very wet, contamination of water in
the feed cone.
16mar00 -- To = 35 K
Antenna history file.
|
| ANT 19 |
K SN 6 |
ps
POOR
gain
curve
|
19jul02 -- New Tcals entered (changed after retrofit but never
reported). This may have affected Tsys values and caused good data to
be too much down weighted.
20feb02 -- Receiver equipped with 3 O-rings, RTV sealant and ecofoam (soida tests fine).
Re-installation successful. Data taken shows normal system temperatures etc.
14feb02 -- Receiver pulled (first one of the K-bands to be
equipped with sealant plus ecofoam).
28mar01 -- This rx will not receive O-ring or mylar replacement. It will
be used as a baseline to determine whether O-ring replacements on other
rx's improve the performance.
18jul00 -- Feed cone purged. Rx temp (To) still high in wet weather.
30jun00 -- To = 60-150 K -- weather very wet, contamination of water in
the feed cone.
30may00 -- pointing OK
17mar00 -- up to 20" sinusoidal pointing variations over 5-10 min timescales.
16mar00 -- To = 35 K
05jan00 -- To - 35 K -- receiver looks OK
Antenna history file.
|
| ANT 20 |
K SN 12 |
ps |
09sep02 -- LO switch replaced (switches LO output between K and Q band) to fix problems with very high Tsys att all IFs.
7feb01 -- Receiver fixed and reinstalled. It now has 3 O-rings plus rtv sealant (but no ecofoam).
01nov01 -- K-band receiver was pulled to fix bad LNAs.
04apr01 -- Top feed cone segment O-ring and new mylar cover were installed.
Bottom 2 feed cone segments (in the rx shelter) were not installed.
16mar00 -- To = 35 K -- receiver looks great.
22feb00 -- New receiver installed.
01feb00 -- Antenna out of the barn and being checked out for operations.
14jan00 -- K band rx being assembled on the bench. All parts are in. Modified
F3 is ready to go.
jan00 -- antenna in the barn for maintenance low values of To)
Antenna history file.
|
| ANT 21 |
K SN 7 |
ps
POOR
gain
curve
|
13may02 -- Polarizations were swapped during reinstallation, this is now fixed.
08may02 -- Receiver successfully re-installed. It now has 3
O-rings, ecofoam plus RTV sealant.
01may02 -- Receiver pulled for moisture problem upgrade.
apr01 -- Top feed cone segment O-ring and new mylar cover installed. O-rings
in bottom two feed cone segments not installed yet.
18jul00 -- Feed cone purged. Rx temp (To) still high in wet weather.
30jun00 -- To = 150-250 K -- weather very wet, contamination of water in
the feed cone.
30may00 -- pointing OK
17mar00 -- up to 20" sinusoidal pointing variations over 5-10 min timescales.
16mar00 -- To = 40 K
Antenna history file.
|
| ANT 22 |
|
ps |
16mar00 -- To = 95 K
Antenna history file.
|
| ANT 23 |
K SN 3 |
ps
POOR
gain
curve
|
19jul02 -- New Tcals entered (changed after retrofit but never
reported). This may have affected Tsys values and caused good data to
be too much down weighted.
3apr02 -- Receiver successfully re-installed. It now has 3
O-rings, ecofoam plus RTV sealant. Tipping data looks ok.
27mar02 -- Receiver pulled for moisture problem upgrade
apr01 -- Top feed cone segment O-ring and new mylar cover installed. O-rings
in bottom two feed cone segments not installed yet.
26jul00 -- K band template panel adjustment complete.
16mar00 -- To = 35 K
01feb00 -- data look great now.
24jan00 -- Amps look reasonable. Still a bit low -- Ken S. will verify
pointing, also, dish requires panel adjustment with K band template.
05jan00 -- New receiver installed, initial checkout
by Ken S. looks good.
Antenna history file.
|
| ANT 24 |
K SN 9
K SN 10
|
ps |
20jul02 -- Tcals have been low, adjusted in the field using LN2
as a cold load.
26jun02 -- Receiver SN9 (from AN26) successfully re-installed. It now has 3
O-rings, ecofoam plus RTV sealant.
04jun02 -- Feedhorn returned to the AOC. This antenna is being painted, and will be held with reinstallation. The receiver will instead be installed at AN26, together with the first WVR.
16may02 -- Feedhorn has been sent to CV for repair.
08may02 -- Receiver pulled for moisture problem upgrade.
26mar02 -- Panel adjustments were completed (from Q-band holography).
28mar01 -- Top feed cone segment O-ring and new mylar cover were installed.
Bottom 2 feed cone segments (in the rx shelter) were not installed.
18jul00 -- Feed cone purged. Rx temp (To) still high in wet weather.
30jun00 -- To = 90 - 150 K -- weather very wet, contamination of water
in the feed cone.
08jun00 -- k band template panel adjustment complete.
16mar00 -- To = 35 K
26may00 -- panel readjustment scheduled completion date. Amps currently
25% below normal.
Antenna history file.
|
| ANT 25 |
K SN 15 |
ps |
19jul02 -- New Tcals entered (changed after retrofit but never
reported). This may have affected Tsys values and caused good data to
be too much down weighted.
27feb02 -- Receiver equipped with 3 O-rings, RTV sealant and
ecofoam. Reinstalled, some problems with cooling at first. NB
Polarisations swapped, fixed the following day???
20feb02 -- Receiver pulled for moisture problem upgrade.
apr01 -- Top feed cone segment O-ring and new mylar cover installed. O-rings
in bottom two feed cone segments not installed yet.
20oct00 -- delays and pointing done, receiver looks reasonable.
18oct00 -- New K band Rx 15 installed
16mar00 -- To = 110 K
Antenna history file.
|
| ANT 26 |
K SN 10
WVR1
|
ps |
14feb03 -- The WVR interface module is pulled, since we detected periodic interference every 0.5MHz at P-band total power spectra. The unit will be shielded before reinstallation.
WVR -- This antenna has high Tcals (2times higher than other new K-bands) because of the WVR, scientific staff needs to monitor the switched power with a high SNR.
12jun02 -- Receiver SN9 pulled for moisture problem upgrade, will be reinstalled at AN24. Retrofitted SN10 (from AN24) was installed, together with the first WVR unit.
28mar01 -- Top feed cone segment O-ring and new mylar cover were installed.
Bottom 2 feed cone segments (in the rx shelter) were not installed.
04oct00 -- Focus was found to be off by ~ 1cm at K band causing low amplitudes.
This was corrected today.
27mar00 -- receiver with re-built WVR installed and checked out for operations.
16mar00 -- Antenna being checked out after maintenance.
31jan00 -- Antenna to the barn for maintenance.
Antenna history file.
|
| ANT 27 |
|
ps |
16mar00 -- To = 130 K
Antenna history file.
|
| ANT 28 |
K SN 4
WVR2
|
ps |
14feb03 -- The WVR interface module is pulled, since we detected periodic interference every 0.5MHz at P-band total power spectra. The unit will be shielded before reinstallation.
WVR -- This antenna has high Tcals (2times higher than other new K-bands) because of the WVR, scientific staff needs to monitor the switched power with a high SNR.
31dec02 -- WVR connected.
26dec02 -- WVR installed but not yet connected.
19dec02 -- Rx reinstalled.
17dec02 -- Rx pulled for WVR testing.
30oct02 -- Rx reinstalled.
04sep02 -- While the antenna was in the AAB the K-band receiver
was taken to the AOC for moisture retrofit. A bad LNA (old sort)
required replacement (both were replaced with the new sort). The rx is
kept at the AOC for testing with WVR number 2.
04apr01 -- Top feed cone segment O-ring and new mylar cover were installed.
Bottom 2 feed cone segments (in the rx shelter) were not installed.
15jun00 -- k band template panel adjustment complete.
23jun00 -- panel readjustment scheduled completion date. Amps currently
25% below normal.
16mar00 -- To = 40 K
05jan00 -- To = 35 K, New receiver looks great
Antenna history file.
|
National Radio
