ALMA Holography Map Log


TIP Last Update: JeffMangum - 22 May 2007

May 2007 Maps

Date SDM File Name Band Nrow Sdir VDSP(SS/RR) PTX(dBm) Focus(mm) RMS(A/P) Quality Comment Observer
2007/05/21
Holoxf42.hpb
104
180
AZ
12.0/12.0
+10
-2.0
2.38e(-3)/0.867
good
Rx cabin overheating (HVAC failure). Wind gusting to 20 MPH. Tamb = 22C. The AEC max velocity and acceleration for are set to the default (600,1200) and (300,800). Outer edge has excessive residual (for unknown reasons). RMS ~ 20 micron.
DTE
2007/05/21
Holoxf66.hpb
104
180
AZ
12.0/12.0
+10
-3.5
2.28e(-3)/0.315
good
Rx cabin overheating (HVAC failure). Outer edge has excessive residual (for unknown reasons). RMS ~ 22 micron.
DTE
2007/05/22
Holoxf9d.hpb
104
180
AZ
12.0/12.0
+10
-3.5
1.31e(-3)/0.432
good
Rx cabin temp now back to normal. New tower position used. Wind at 22 MPH. Map scanning speed reduced from the original 300"/s down to 150"/s. This map lasted 2 hours because of the slower speed.
DTE
2007/05/22
Holoxfb6.hpb
104
180
AZ
12.0/12.0
+10
-3.5
1.168e(-3)/0.200
good
Map scanning speed reduced from the original 300"/s down to 150"/s. This map lasted 2 hours because of the slower speed. Wind ~ 20mph steady, temperature 20.6 C.
DTE
2007/05/22
Holoxfcd.hpb
104
180
AZ
12.0/12.0
+10
-3.5
0.992e(-3)/0.150
good
Slow-speed map.
DTE
2007/05/23
Holoxfee.hpb
104
180
AZ
12.0/12.0
+10
-3.5
1.322e(-3)/0.589
good
Slow-speed map.
DTE
2007/05/23
Holox100c.hpb
104
180
AZ
12.0/12.0
+10
-3.5
0.890e(-3)/0.102
good
Slow-speed map.
DTE
2007/05/23
Holox102a.hpb
104
180
AZ
12.0/12.0
+10
-3.5
1.853e(-3)/0.1424
good
 
DTE
2007/05/23
Holox1036.hpb
104
180
AZ
12.0/12.0
+10
-3.5
1.384e(-3)/0.232
good
Slow-speed map.
DTE
2007/05/24
Holox1096.hpb
104
180
AZ
12.0/12.0
+10
-3.5
1.976e(-3)/0.298
good
Slow-speed map. Wind 10 mph gusting to 20 mph. Temp 21.4 C.
DTE
2007/05/24
Holox10b4.hpb
104
180
AZ
12.0/12.0
+10
-3.5
1.543e(-3)/0.215
good
Slow-speed map. Wind 10 mph, Temp 20.3 C.
DTE
2007/05/24
Holox10d6.hpb
104
180
AZ
12.0/12.0
+10
-3.5
1.151e(-3)/0.281
good
Slow-speed map. Wind 15 mph, fairly steady. Temp 18.2 C.
DTE
2007/05/24
Holox10f5.hpb
104
180
AZ
12.0/12.0
+10
-3.5
1.528e(-3)/0.226
good
Slow-speed map. Wind 10 mph very steady, and temp 16.6C.
DTE
2007/05/24
Holox1117.hpb
104
180
AZ
12.0/12.0
+10
-3.5
2.585e(-3)/0.498
good
Slow-speed map. Wind <5mph.
DTE
2007/05/24
Holox1136.hpb
104
180
AZ
12.0/12.0
+10
-3.5
3.318e(-3)/0.900
bad
Poor phase stability. Wind 2 mph.
DTE
2007/05/24
Holox114b.hpb
104
180
AZ
12.0/12.0
+10
-3.5
6.6561e(-3)/0.633
good
Slow-speed map. Wind 4 mph.
DTE
2007/05/24
Holox114f.hpb
104
180
AZ
12.0.12.0
+10
-3.5
4.817e(-3)/0.428
good
Slow-speed map. Wind 2 mph Partly cloudy during this map.
DTE
2007/05/25
Holox69.hpb
104
180
AZ
12.0/12.0
+10
-3.5
1.195e(-3)/0.328
good
Wind 2 mph, Temp 16.2 C.
DTE
2007/05/25
Holox148.hpb
104
180
AZ
12.0/12.0
+10
-3.5
1.693e(-3)/0.4132
good
Wind 6 mph, Temp 11 C.
DTE
2007/05/25
Holox15f.hpb
104
180
EL
12.0/12.0
+10
-3.5
1.371e(-3)/0.4277
good
Wind 6 mph, Temp 11.1 C.
DTE
2007/05/26
Holox193.hpb
104
180
AZ
12.0/12.0
+10
-3.5
1.476e(-3)/0.6404
good
Wind 13 mph, Temp 15.2 C.
DTE
2007/05/26
Holox1ab.hpb
104
180
EL
12.0/12.0
+10
-3.5
1.929e(-3)/1.150
good
Wind 7 mph, Temp 18.8 C. Somewhat poorer residual phase than typical, but an ok map nonetheless.
DTE
2007/05/26
Holox1c0.hpb
104
180
AZ
12.0/12.0
+10
-3.5
3.744e(-3)/1.670
bad
Wind at start 4 mph Temp 20.3 C. At subscan 75-80, ~18:25 UTC, wind gusts up to 56 mph!!
Very short-lived blast of wind. By subscan ~140, 18:50 UTC, wind steady down at ~10 mph. Excessive phase residual (due to wind?). Resultant RMS a bit high.
DTE
2007/05/26
Holox1c3.hpb
104
180
AZ
12.0/12.0
+10
-3.5
1.548e(-3)/0.442
good
Wind at start 9 mph, Temp 20.3 C.
DTE
2007/05/26
Holox1ec.hpb
104
180
EL
12.0/12.0
+10
-3.5
2.005e(-3)/0.488
bad
Wind 11 - 13 mph, Temp 21.9. Total power stability poor, which apparently lead to less-than-optical calibration. This map only slightly "bad".
DTE
2007/05/26
Holox209.hpb
79
180
AZ
12.0/12.0
+10
-3.5
5.535e(-6)/0.445
bad
79 GHz map but with 104 GHz feed installed. Tower position set to 154.592 degs 7.9725 degs. SB "Holography 78.92 GHz". Wind 17 mph, Temp 20.5 C.
DTE
2007/05/26
Holox220.hpb
104
180
AZ
12.0/12.0
+10
-3.5
7.017e(-3)/0.611
good
Wind varying from 8 mph to 20 mph. Temp 20.5 C. Amplitude stability poorer than usual. About 2/3 way through map nominal amplitude drop.
DTE
2007/05/26
Holox239.hpb
104
180
EL
12.0/12.0
+10
-3.5
1.487e(-3)/0.517
good
Wind 10 mph, Temp 17.5 C.
DTE
2007/05/27
Holox25a.hpb
104
180
AZ
12.0/12.0
+10
-3.5
1.096e(-3)/0.461
good
Wind 9 mph, Temp 20.5 C.
DTE
2007/05/27
Holox271.hpb
104
180
EL
12.0/12.0
+10
-3.5
1.021e(-3)/0.299
good
Wind 12mph Temp 21.5 C.
DTE
2007/05/30
Holox12147.hpb
104
180
AZ
12.0/12.0
+10
-3.5
1.123e(-3)/0.511
good
Taken after software changes (upgrades?). For unknown reasons, absorber around prime focus not in-place. Actually looks ok under the circumstances. Ringing a bit worse than usual around outer edge (due to missing absorber?).
DTE
2007/05/30
Holox1214d.hpb
104
180
EL
12.0/12.0
+10
-3.5
1.890e(-3)/0.318
good
Same as above. Last map made before shipping to Chile.
DTE


January 2007 Maps

Date SDM File Name Band Nrow Sdir VDSP(SS/RR) PTX(dBm)Sorted ascending Focus(mm) RMS(A/P) Quality Comment Observer
2007/01/02
Holo9a5.hpb
104
180
AZ
12.0/12.0
+13
-2.0
2.56e(-3)/0.329
good
Absorber removed from reference side of Rx. Ripples worse.
DTE
2007/01/02
Holo9b8.hpb
104
180
EL
11.0/12.0
+13
-2.0
1.27e(-3)/0.262
good
Same as 9a5 but vertically scanned. Ripples about same as 9a5.
DTE
2007/01/02
Holo9cb.hpb
104
180
AZ
12.0/12.0
+13
-2.0
2.09e(-3)/0.271
good
Eccosorb around Rx reference feed box re-installed just before this map. Ripples
DTE
2007/01/02
Holo9de.hpb
104
180
EL
12.0/12.0
+13
-2.0
1.31e(-3)/0.204
good
Same as 9cb, but vertically scanned. Ripples, but perhaps not as bad???
DTE
2007/01/02
Holoa1d.hpb
104
360
AZ
12.0/12.0
+13
-2.0
???
bad
??? Screwed-up? Cannot export. Archive software problem? Bug in SDM writer. NO GOOD.
DTE
2007/01/03
Holoa5a.sdm
104
180
AZ
12.0/12.0
+13
-2.0
8.14e(-3)/0.420
bad
IMPORTANT! This map was obtained after adding an additional piece of ecosorb around the "step" in the signal feed mount area of the
Rx. The outer rim of this absorber has a triangular pattern to attempt to break-up a suspected knife-edge reflection. Marginal phase stability. Amplitude stability much worse than usual.
DTE
2007/01/03
Hoload7.sdm
104
180
AZ
12.0/12.0
+13
-2.0
???
bad
SDM-to-hpb conversion failed.
DTE
2007/01/03
Holoaff.sdm
104
180
AZ
12.0/12.0
+13
-2.0
2.09e(-3)/0.395
bad
Marginal phase stability. Ripples worse. Significant emission beyond edge of reflector (reflections?).
DTE
2007/01/03
Holob12.sdm
104
180
AZ
12.0/12.0
+13
-2.0
2.00e(-3)/0.434
bad
Marginal phase stability. Ripples worse. Significant emission beyond edge of reflector (reflections?).
DTE
2007/01/03
Holob25.sdm
104
180
AZ
12.0/12.0
+13
-2.0
4.32e(-2)/2.240
bad
Very poor amplitude and phase stability. Amplitude/phase jump 2/3 way through map. Significant emission beyond edge of reflector (reflections?).
DTE
2007/01/03
Holob38.sdm
104
180
AZ
12.0/12.0
+13
-2.0
2.324e(-3)/0.504
bad
Very poor amplitude and phase stability. Amplitude/phase drift throughout map. Significant emission beyond edge of reflector (reflections?).
DTE
2007/01/04
Holob4d.sdm
104
180
AZ
11.5/11.5
+13
-2.0
1.55e(-3)/0.381
bad
Reasonably good phase stability. Still some amplitude signal beyond edge of reflector, though not as bad as before. Ripples still bad.
DTE
2007/01/04
Holob60.sdm
104
180
AZ
12.5/12.5
+13
-2.0
2.09e(-3)/0.322
bad
NOTE: Sawtooth absorber around "step" in Rx signal feed mounting plate removed. Reasonably good phase stability. Still some amplitude signal beyond edge of reflector. Ripples still bad.
DTE
2007/01/04
Holob73.sdm
104
180
AZ
12.0/12.0
+13
-2.0
1.24e(-3)/0.316
bad
Reasonably good phase stability. A lot of amplitude signal beyond edge of reflector. Ripples still bad. Poorest map this week.
DTE
2007/01/04
Holob86.sdm
104
180
AZ
12.0/12.0
+13
-2.0
2.34e(-3)/0.345
bad
Reasonably good phase stability. Some amplitude signal beyond edge of reflector. Ripples still bad.
DTE
2007/01/04
Holob99.sdm
104
360
AZ
11.5/12.0
+13
-2.0
???
bad
Attempt to try a large map again fails. Archive error still. NO GOOD.
DTE
2007/01/05
Holobc2.sdm
104
180
AZ
12.5/12.5
+13
-2.0
1.87e(-3)/0.584
good
Marginal phase stability. Ripples still bad.
DTE
2007/01/05
Holobd5.sdm
104
180
AZ
12.5/12.5
+13
-2.0
1.96e(-3)/1.03
bad
Poor phase stability. Ripples still bad.
DTE
2007/01/09
Holoc13.sdm
104
180
AZ
12.0/12.0
+13
-2.0
3.32e(-3)/0.692
bad
Poor phase stability. Ripples still present.
DTE
2007/01/09
Holoc26.sdm
104
180
AZ
12.0/12.0
+13
-2.0
1.44e(-3)/0.402
good
Transmitter repointed to point it 1 degree off-axis (to try to minimize reflections; wanted 2 degrees). Marginal phase stability. Still ripples.
DTE
2007/01/09
Holoc39.sdm
104
180
AZ
12.5/12.5
+13
-2.0
2.32e(-3)/0.302
good
Still ripples.
DTE
2007/01/10
Holoc4e.sdm
104
180
AZ
12.0/12.0
+13
-2.0
1.70e(-3)/0.426
good
Marginal phase stability. Still ripples.
DTE
2007/01/10
Holoc61.sdm
104
180
AZ
12.2/12.2
+13
-2.0
2.50e(-3)/0.485
good
Marginal phase stability. Still ripples.
DTE
2007/01/10
Holoc74.sdm
104
180
EL
11.2/11.2
+13
-2.0
1.49e(-3)/0.535
good
Marginal phase stability. Still ripples.
Two changed made for this map: (1) Absorber over front to Tx feed has been angled by about 5 degrees upwards. This should be enough to put any reflection coming from the ALMA antenna, reflected back off the front surface of this absorber, to be reflected about 10 degrees away from the ALMA antenna. (2) Pointing of the Tx has been realigned to maximize the power into the holography receiver. This increased the received power by about 16% or 0.67 dB. This confirms that Jack's attempt to change the tx pointing to the -3 dB point, which had been the intention, didn't work out. I suspect that the Tx antenna may have started off, say, -1 degree away from optimum, and Jack changed it as requested by +2.3 degrees, but it then ended up at about +1.3 degrees from the maximum, not far enough for the test I had in mind.
DTE
2007/01/10
Holoc87.sdm
104
180
AZ
11.9/11.9
+13
-2.0
1.15e(-3)/0.320
good
Good. Still ripples
DTE
2007/01/11
Holoc9a.sdm
104
180
AZ
12.0/12.0
+13
-2.0
1.80e(-3)/0.449
good
Good. Still ripples. Note that the outer absorber sheet at the prime focus, in the bottom left quadrant if you stand in front of the antenna looking at the surface, was flapping in the breeze during these measurements.
DTE
2007/01/12
Holocaf.sdm
104
180
AZ
12.5/12.5
+13
-2.0
6.03e(-3)/2.520
bad
Bad. Wind gusting to 16 m/s. Very poor amplitude and phase stability. Lots of emission beyond edge of reflector. Bad ripples.
DTE
2007/01/12
Holocc2.sdm
104
180
AZ
12.5/12.5
+13
-2.0
4.53e(-3)/1.940
bad
Bad. Wind gusting to 16 m/s. Very poor amplitude and phase stability. Bad ripples.
DTE
2007/01/12
Holocd5.sdm
104
180
AZ
12.5/12.5
+13
-2.0
2.01e(-3)/1.840
bad
Bad. Wind gusting to 11 m/s. Very poor amplitude and phase stability. Bad ripples.
DTE
2007/01/13
Holoce8.sdm
104
180
AZ
12.5/12.5
+13
-2.0
2.48e(-3)/1.260
bad
Very poor phase stability. Absorber near prime focus coming loose and Rx reference feed absorber fallen off. Wind 9 to 14 m/s.
DTE
2007/01/13
Holod0e.sdm
104
180
AZ
12.5/12.5
+13
-2.0
7.93e(-4)/0.527
bad
Several changes: (1) A piece of absorber has been put in front of the SIGNAL receiver feed. The phase response of this is unknown, so the absolute structure measured on the surface from this map will be meaningless. However, it does seem have significantly reduced the 1.25 Hz modulation on the reference signal, and the main signal seems much more stable. This could be because (a) it has reduced the reflection of the transmitter back from the main signal feed back to the tower, or (b) because it has reduced the amount of LO power being radiated out of the main signal feed. More likely, Murphy is busy and it's just the wind direction or the phase of the moon. This is just an experiment. (2) The flapping absorber around the main sig receiver has been tied down. It is fixed in place more firmly. (3) A new sheet of flat absorber has been installed around the reference receiver feed. This is a single flat sheet of thicker (1-inch?) absorber somewhat larger in extent than the receiver width, glued to the flat front face of the receiver, behind the reference horn.
DTE
2007/01/17
Holod23.sdm
104
180
AZ
5.8/8.0
+13
-2.0
1.23e(-3)/0.415
bad
Wind low now (3.5 m/s; gusting to 6 m/s). Absorber still in front of Rx signal feed feed.
Before this map, a slanted
copper plate in front of the holo tx was installed. Slant angle about 10 degrees,
redirecting incoming radiation up to the sky. There is a hole in this copper plate matching the outer ring of the holography antenna. The copper plate is put on top of the absorber layer that was
already in place, and which still covers the lens/horn antenna. The theory is that we were seeing spurious radiation, LO or whatever,
being scattered back from the absorber sheet over the transmitter. The copper sheet should be better, in that it won't scatter, it'll reflect any unwanted radiation on to the sky.
Also added extra absorber on the tower, in particular trying to eliminate any "corner-cube" type of reflection. The trace in Labview on or besides boresight was excellent after
this plate was put in place - any 1.25 Hz ripple is no more than 0.5% peak to peak in either reference or main sig receiver, and comparable with the natural noise level. Never seen it better.
HOWEVER, the improvement could still be because of the relatively low wind at the moment.
Expect this map to have excellent calibration, but to have horrible aperture phase and amplitude, just like yesterday's last map. The absorber in front of the prime focus holo feed is still there.
Marginal phase stability. Ripples.
DTE
2007/01/17
Holod36.sdm
104
180
AZ
13.3/12.2
+13
-2.0
1.86e(-3)/0.177
good
Wind 4 m/s, gusting to 5 m/s. Before this map absorber in front of the main holo rx feed was removed. So, this should be a valid map. Copper plate still in front of the tx (proposing to leave that
there permanently).
Very good. Minimal ripples.
DTE
2007/01/17
Holod49.sdm
104
180
AZ
13.3/13.0
+13
-2.0
3.52e(-3)/0.529
good
Wind 4 m/s gusting to 5 m/s. Same configuration as for d36.
Marginal amplitude and phase stability. Amplitude and phase jump half-way through map. Map not bad nonetheless.
DTE
2007/01/17
Holod5c.sdm
104
180
AZ
11.5/11.1
+13
-2.0
1.88e(-3)/0.533
bad
Wind 4 m/s gusting to 6 m/s. Same configuration as for d36 and d49.
Marginal phase stability. Emission beyond edges of reflector. Some ripples.
DTE
2007/01/17
Holod6f.sdm
104
180
AZ
11.8/11.2
+13
-2.0
1.02e(-3)/0.074
good
Wind 3 m/s gusting to 4 m/s. Same configuration as for d36, d49, d5c.
Very good amplitude and phase stability. Map pretty good, but still with some rippling.
DTE
2007/01/18
Holod82.sdm
104
180
AZ
12.2/13.1
+13
-2.0
 
unknown
COULD NOT EXTRACT FROM ARCHIVE.
Wind 1.5 m/s; 2 m/s gust.
DTE
2007/01/18
Holod83.sdm
104
180
AZ
12.2/12.8
+13
-2.0
 
unknown
COULD NOT EXTRACT FROM ARCHIVE. Wind 3 m/s; 4 m/s gust. Experimental metal plate installed behind the Rx signal feed.
DTE
2007/01/18
Holod84.sdm
104
180
AZ
13.1/12.1
+13
-2.0
1.44e(-3)/0.297
good
Wind 3.5 m/s; 4.5 m/s gust. Removed the circular 35-cm diameter metal plate behind the prime focus feed. Also removed the nice flat layer of absorber that was still behind the metal plate, which we put there some time ago to replace the old absorber with the cuts and gaps in it. Then glued a fresh flat disk of absorber (35 cm diameter) to the plate just removed, and put that plate+absorber back behind the Rx signal feed. The end of the feed is now about 1 cm in front of the absorber. The end of the feed is 1.5 cm in front of the absorber, so the metal plate has now pushed the absorber sheet about 0.5 cm further out. Good amplitude and phase stability. Ripples still present.
DTE
2007/01/18
Holod97.sdm
104
180
AZ
13.3/12.6
+13
-2.0
1.50e(-3)/0.324
good
Wind 3.5 m/s; 4.5 m/s gust. Same Rx signal feed configuration as for d84. Good amplitude and phase stability. Ripples still present. Some emission beyond reflector.
DTE
2007/01/19
Holodaa.sdm
104
180
AZ
12.2/13.1
+13
-2.0
8.20e(-4)/0.200
good
Wind 3 m/s; gust 4 m/s. Very cold (-3 C). Same Rx signal feed configuration as d97. Some of the best amplitude and phase stability I have ever seen in ATF holography. Still some ripples.
DTE
2007/01/19
Holodbd.sdm
104
180
AZ
12.2/13.1
+13
-2.0
5.05e(-4)/0.173
good
Wind 3 m/s; gust 4 m/s. Very cold (-3 C). Starting to snow a little bit. Some small amount of snow collected on reflector. Same Rx signal feed configuration as d97. Some of the best amplitude and phase stability I have ever seen in ATF holography. Still some ripples.
DTE
2007/01/19
Holodd0.sdm
104
180
AZ
12.1/12.7
+13
-2.0
1.56e(-3)/0.342
good
Wind 4 m/s; gust 5 m/s. Very cold (-3 C). Snow collected on reflector previously gone. Same Rx signal feed configuration as d97. Some of the best amplitude and phase stability I have ever seen in ATF holography. Still some ripples. Some emission beyond reflector.
DTE
2007/01/19
Holode3.sdm
104
180
AZ
12.7/12.0
+13
-2.0
8.58e(-4)/0.323
good
Wind 4 m/s; gust 5.5 m/s. Very cold (+1 C). Surface clear and dry. Same Rx signal feed configuration as d97. Some of the best amplitude and phase stability I have ever seen in ATF holography. Still some small ripples.
DTE
2007/01/19
Holodf6.sdm
104
180
EL
12.6/11.8
+13
-2.0
1.124e(-3)/0.213
good
Wind 4.5 m/s; gust 6 m/s. Cold (+2 C). Surface clear and dry. Same Rx signal feed configuration as d97. Some of the best amplitude and phase stability I have ever seen in ATF holography. Few if any ripples. Maybe the best map we have taken during Winter 2006/2007.
DTE
2007/01/19
Holoe09.sdm
104
180
EL
13.0/12.6
+13
-2.0
1.79e(-3)/0.669
good
Wind 5 m/s; gust 6 m/s. Cold (+2 C). Surface clear and dry. Same Rx signal feed configuration as d97. Not great phase stability. Few if any ripples. Pretty good map considering the less than marginal phase stability.
DTE
2007/01/19
Holoe1c.sdm
104
180
AZ
13.3/12.7
+13
-2.0
1.52e(-3)/0.671
good
Wind 5 m/s; gust 8 m/s. Cold (+0 C). Some moisture on 1 or 2 of the bottom panels at start of map, but clear at end. Same Rx signal feed configuration as d97. Not great phase stability. Some ripples. Pretty good map considering the less than marginal phase stability.
DTE
2007/01/19
Holoe2f.sdm
104
180
AZ
11.9/12.8
+13
-2.0
1.36e(-3)/0.335
good
Wind 5 m/s; gust 8 m/s. Cold (+0 C). Reflector surface clear and dry. Same Rx signal feed configuration as d97. Not great phase stability. Some ripples. Good map.
DTE


December 2006 Maps

Date SDM File Name Band Nrow Sdir VDSP(SS/RR) PTX(dBm) Focus(mm) RMS(A/P) Quality Comment Observer
2006/12/01
Holo3ff01.hpb
104
180
EL
12.0/12.0
+13
-2.0
2.22e(-3)/0.190
good
Vertically-scanned version of 3fc72. Absorber still covering Tx feed and panels still offset. Ripples and asymmetry.
JGM
2006/12/01
Holo3ff02.hpb
104
180
AZ
12.0/12.0
+13
-2.0
4.33e(-3)/0.629
good
Same as 3ff01 but scanned horizontally. Ripples and asymmetry.
JGM
2006/12/01
Holo0401a1.sdm
104
180
AZ
12.0/12.0
+13
-2.0
3.29e(-3)/0.385
good
Removed offsetset adjustment of panels 7-63 and 11-64 (i.e. pushed them back down 100 micron). Tx feed still covered with absorber. Ripples.
JGM
2006/12/17
Holo074e0.sdm
104
180
AZ
13.0/13.0
+13
-2.0
1.95e(-3)/0.421
good
First map since ACS6.0 upgrade. High winds (gusts to 55 MPH). Using new holography SB with resolution parameter set to 6.667cm (which is clearly wrong). Also first map since extra eccosorb installed on holography tower. Ripples still present with similar amplitude. Apparently holography tower eccosorb had no affect on ripple pattern. Note that Tx feed still covered with absorber. NOTE: periodic every-other-panel-holes on boundary between rings 3 and 4 due to photogrammetry patches.
DTE
2006/12/18
Holo07640.sdm
104
180
AZ
13.0/13.0
+13
-2.0
2.22e(-3)/1.020
bad
Poor phase stability (poor weather?). Using new holography SB with resolution parameter set to 6.667cm (which is clearly wrong). Made with extra eccosorb installed on holography tower. Ripples still present with similar amplitude. Apparently holography tower eccosorb had no affect on ripple pattern. Note that Tx feed still covered with absorber. NOTE: periodic every-other-panel-holes on boundary between rings 3 and 4 due to photogrammetry patches.
DTE
2006/12/18
Holo07930.sdm
104
180
AZ
13.0/13.0
+13
-2.0
3.05e(-3)/0.793
bad
Poor phase stability (poor weather?). Using new holography SB with resolution parameter set to 6.667cm (which is clearly wrong). Made with extra eccosorb installed on holography tower and with improved eccosorb installed at signal-feed region. Ripple structure much better, with pattern eliminated from amplitude map, but still present at a lower level in phase map. Better absorber at signal feed helped, but holography tower eccosorb did not. Note that Tx feed still covered with absorber. NOTE: periodic every-other-panel-holes on boundary between rings 3 and 4 due to photogrammetry patches.
DTE
2006/12/18
Holo7a70.sdm
104
180
AZ
13.0/13.0
+13
-2.0
1.23e(-3)/0.201
good
Pretty good phase stability (considering iffy weather). Using new holography SB with resolution parameter set to 6.667cm (which is clearly wrong). Made with extra eccosorb installed on holography tower and with improved eccosorb cover over signal feed region. Note that Tx feed still covered with absorber. NOTE: periodic every-other-panel-holes on boundary between rings 3 and 4 due to photogrammetry patches.
Ripples much better, indicating the improved signal-feed region absorber helped a lot. Not back to 2003/2004/2005 quality, though.
DTE
2006/12/19
Holo7bc.sdm
104
180
AZ
13.0/13.0
+13
-2.0
1.39e(-2)/0.437
bad
Very poor amplitude stability. NO GOOD.
DTE
2006/12/19
Holo88d.sdm
104
180
EL
13.0/13.0
+13
-2.0
1.36e(-3)/0.314
unknown
 
DTE
2006/12/19
Holo876.sdm
104
180
AZ
13.0/13.0
+13
-2.0
 
bad
BAD ROW (antenna went way off track). NO GOOD.
DTE
2006/12/20
Holo8a0.sdm
104
180
AZ
13.0/13.0
+13
-2.0
1.38e(-3)/0.215
bad
ICE ON SURFACE (mainly bottom). NO GOOD.
DTE
2006/12/20
Holo8ca.sdm
104
180
EL
13.0/13.0
+13
-2.0
 
unknown
 
DTE
2006/12/20
Holo8dd0.sdm
104
180
AZ
13.0/13.0
+13
-2.0
2.78e(-3)/0.367
good
Good map.
DTE
2006/12/20
Holo8f0.sdm
104
180
EL
13.0/13.0
+13
-2.0
1.79e(-3)/0.212
good
Good map.
DTE
2006/12/20
Holo903.sdm
104
180
EL
13.0/13.0
+13
-2.0
 
unknown
Changed the Tx frequency by -60 MHz, to put it into the LSB sideband of the receiver, which normally runs as a USB system. Didn't touch the receiver frequency or attenuators. The level in the receiver was nearly identical (perhaps 5% weaker, that's all). The new Tx frequency, according to the Labview control, is 103.95998486 GHz (instead of the usual ~104.02 GHz).
DTE
2006/12/21
Holo943.sdm
104
180
AZ
11.5/11.5
+13
-2.0
2.78e(-3)/0.329
good
Map made after having removed the 3rd feed leg cover out from the prime focus, on each of the 4 feed legs. This was the cover that was giving reflections from feed to dish, as indicated by Darrel's laser pointer.
DTE
2006/12/22
Holo97c.sdm
104
180
AZ
12.0/12.0
+13
-2.0
2.56e(-3)/0.404
good
NEW ABSORBER PLACED AROUND TX.
Map made after fixing Tx (had failed to start again after holography tower absorber installation). Amplitude stability not great at start due to Tx warming up after restart.
DTE
2006/12/22
Holo98f.sdm
104
180
AZ
12.5/12.5
+13
-2.0
1.26e(-3)/0.266
good
Good map.
DTE


November 2006 Maps

Date SDM File Name Band Nrow Sdir VDSP(SS/RR) PTX(dBm) Focus(mm) RMS(A/P) Quality Comment Observer
2006/11/09
Holo355d3.sdm
104
180
AZ
?
+7.5
 
?
good
Fixed Tx frequency problem.
JGM
2006/11/09
Holo35ae1.sdm
79
180
AZ
?
+7.5
 
?
good
79 GHz observation with what is suspected to be 104 GHz horn installed. Also more Eccosorb on front of prime focus.
JGM
2006/11/09
Holo35c41.sdm
104
180
AZ
?
+7.5
 
?
good
104 GHz observation with what is suspected to be 104 GHz horn.
JGM
2006/11/09
Holo35c42.sdm
79
180
AZ
?
+7.5
 
2.51e(-3)/0.244
good
79 GHz observation with what is suspected to be the 79 GHz horn installed. Fit focus = 6.6mm. Extreme ripples (DSP input too high?).
JGM
2006/11/09
Holo35ec1.sdm
79
180
AZ
?
+7.5
 
?
good
79 GHz observation with what is suspected to be the 79 GHz horn installed.
JGM
2006/11/09
Holo35ec2.sdm
79
180
AZ
?
+7.5
 
?
good
79 GHz observation with what is suspected to be the 79 GHz horn installed.
JGM
2006/11/09
Holo35ec3.sdm
79
180
AZ
?
+7.5
 
?
good
79 GHz observation with what is suspected to be the 79 GHz horn installed.
JGM
2006/11/10
Holo362e1.sdm
79
180
AZ
?
+7.5
 
2.90e(-3)/0.229
good
Hornless observed at 79 GHz. Best fit focus = -27.2mm.
JGM
2006/11/10
Holo36481.sdm
104
180
AZ
?
+7.5
-4.0
3.08e(-3)/0.219
good
104 GHz horn reinstalled. Unidirectional. Peaked axial focus to -4mm.
JGM
2006/11/10
Holo365d1.sdm
104
180
AZ
?
+7.5
-4.0
3.11e(-3)/0.176
good
Unidirectional. Eccosorb over manhole for half of map. RR power near saturation at end. Ripples.
JGM
2006/11/10
Holo36721.sdm
104
360
AZ
?
+7.5
-4.0
2.12e(-3)/0.923
bad
Double number of rows (to 360). Segfaults CLIC. Poor phase stability.
JGM
2006/11/10
Holo36722.sdm
104
180
AZ
?
+7.5
-4.0
?
bad
Died near middle of map for no apparent reason.
JGM
2006/11/11
Holo368b1.sdm
104
180
AZ
18-5/18-5
+7.5
-4.0
1.61e(-3)/0.285
good
Ran at high (RR/SS=18.0) boresight signal levels at beginning. Dropped to 5.0 for both at end. Ripples.
JGM
2006/11/11
Holo368b2.sdm
104
180
AZ
15-5/15-5
+7.5
-4.0
5.97e(-3)/0.388
good
Ran at high (RR/SS=15.0) boresight signal levels at beginning. Dropped to 5.0 for both at end. Ripples.
JGM
2006/11/11
Holo36b62.sdm
104
180
AZ
15/15
+7.5
-4.0
1.62e(-3)/1.45
bad
Ran at high (RR/SS=15.0) boresight signal levels throughout. Very poor phase stability. Windy.
JGM
2006/11/11
Holo36df1.sdm
104
180
AZ
15/15
+7.5
-4.0
1.44e(-3)/1.67
bad
Ran at high (RR/SS=15.0) boresight signal levels throughout. Also scanned at 600 arcsec/sec with boresight every row. Windy.
JGM
2006/11/11
Holo370c1.sdm
104
180
AZ
15/15
+7.5
-4.0
2.13e(-3)/1.01
good
Ran at high (RR/SS=15.0) boresight signal levels throughout. Removed eccosorb from focus ring around signal feed. Windy. Ripples not as extreme.
JGM
2006/11/11
Holo370c2.sdm
104
180
AZ
15/15
+7.5
-4.0
1.21e(-3)/0.986
good
Ran at high (RR/SS=15.0) boresight signal levels throughout. Removed eccosorb from focus ring around signal feed. Windy. Ripples not as bad.
JGM
2006/11/11
Holo370c3.sdm
104
180
AZ
5/5
+7.5
-4.0
1.05e(-3)/0.820
good
Ran at low (RR/SS=5.0) boresight signal levels at throughout. Removed eccosorb from focus ring around signal feed. Windy. Not as rippled.
JGM
2006/11/15
Holo37601.sdm
104
180
AZ
10/10
+13
-2.0
3.91e(-3)/0.335
good
Ran with now-thought-to-be-correct high +13 dBm transmitter output power. Ripples.
DTE
2006/11/15
Holo37602.sdm
104
180
AZ
10/10
+13
-2.0
?
bad
Ran with now-thought-to-be-correct high +13 dBm transmitter output power. DSP oscillation at start.
DTE
2006/11/15
Holo37603.sdm
104
180
AZ
1/1
+13
-2.0
2.42e(-3)/0.212
good
Ran with now-thought-to-be-correct high +13 dBm transmitter output power. Ripples (so existence of ripples is not correlated with DSP input).
DTE
2006/11/15
Holo379b1.sdm
104
180
AZ
13/13
+13
-2.0
1.28e(-3)/0.158
good
Ripples.
DTE
2006/11/15
Holo38041.sdm
104
180
EL
8-11/8-11
+13
-2.0
1.78e(-3)/0.479
good
Ripples.
DTE
2006/11/16
Holo37dc1.sdm
104
180
EL
10/10
+13
-2.0
1.59e(-3)/0.393
good
 
DTE
2006/11/16
Holo37dc2.sdm
104
180
EL
13/13
+13
-2.0
2.29e(-3)/0.226
good
Ripples.
DTE
2006/11/17
Holo38191.sdm
104
180
EL
13/13
+13
-2.0
?
bad
"TELCAL" failed (segmentation fault), crashing the elevation scans after 178 subscans.
DTE
2006/11/17
Holo381b1.sdm
104
180
AZ
10/10
+13
-2.0
2.85e(-3)/0.381
good
 
DTE
2006/11/18
Holo38301.sdm
104
180
AZ
13-8/13-18
+13
-2.0
1.30e(-2)/0.730
bad
Amplitude jump during map. By the end of the map, the reference signal had crept up from 13 V to 18 volts, which is where saturation has already set in to some degree. The main signal however had gone down from 13 volts to 8 volts, which is the normal behavior we've been seeing.
I don't understand this, unless there were ice or dew or something on the reference feed while I was setting the dBs in the receiver, and it melted or dried off during the observations. The antenna is facing the sun.
DTE
2006/11/18
Holo38302.sdm
104
180
AZ
11-10/11-10
+13
+2.5
3.55e(-3)/0.341
good
Set the focus from -2000 to +2500, which takes the main signal to approximately the -3 dB point in focus. The theory is that with this map, the spurious rings in the outer surface map should decrease by 6 dB.
DTE
2006/11/18
Holo38303.sdm
104
180
AZ
11.5/11.5
+13
-2.0
4.12e(-3)/0.473
good
 
DTE
2006/11/23
Holo3e541.sdm
104
180
AZ
13-14/13-14
+13
-2.0
1.27e(-3)/0.473
good
First map since position-tagging fix. Appears that positions are being tagged correctly now. Ripples just as bad as before.
NJE
2006/11/27
Holo3e6e2.sdm
104
180
AZ
?
+13
-2.0
?
good
reference map for stability
RLucas
2006/11/27
Holo3e6e3.sdm
104
180
AZ
?
+13
-2.79
?
unknown
move the focus by about lambda/4, ringing pattern unchanged
RLucas
2006/11/27
Holo3e6e4.sdm
104
180
AZ
?
+13
-2.0
?
unknown
reference map for stability again
RLucas
2006/11/28
Holo3eab2.sdm
104
180
AZ
?
+13
-2.0
?
unknown
 
RLucas
2006/11/28
Holo3eab3.sdm
104
180
AZ
?
+13
-2.0
?
unknown
 
RLucas
2006/11/28
Holo3eab5.sdm
104
180
AZ
?
+13
-2.0
?
unknown
 
RLucas
2006/11/28
Holo3eab6.sdm
104
180
AZ
?
+13
-2.0
?
unknown
 
RLucas
2006/11/28
Holo3eab8.sdm
104
180
AZ
?
+13
-2.0
?
unknown
 
RLucas
2006/11/28
Holo3eab9.sdm
104
180
AZ
?
+13
-2.0
?
bad
Not in the archive
RLucas
2006/11/28
Holo00022.sdm
104
180
AZ
?
+13
-2.0
?
unknown
 
RLucas
2006/11/29
Holo00023.sdm
104
180
AZ
?
+13
-2.0
?
unknown
 
RLucas
2006/11/29
Holo00024.sdm
104
180
AZ
?
+13
-2.0
?
unknown
 
RLucas
2006/11/29
Holo00025.sdm
104
180
AZ
?
+13
-2.0
?
unknown
 
RLucas
2006/11/29
Holo3f1e1.sdm
104
180
AZ
?
+13
-2.0
?
unknown
 
RLucas
2006/11/29
Holo3f1e4.sdm
104
180
AZ
?
+13
-2.0
?
unknown
Snow on the dish
RLucas
2006/11/29
Holo3f5b1.sdm
104
180
AZ
?
+13
-2.0
?
unknown
Horn replaced by waveguide Snow on the dish
RLucas
2006/11/29
Holo3f751.sdm
104
180
AZ
?
+13
-2.0
?
unknown
Horn replaced by waveguide,Snow on the dish, snow on transmitter?
RLucas
2006/11/30
Holo3f8b1.sdm
104
180
AZ
12.0/12.0
+13
-2.0
1.97e(-3)/0.287
good
Signal feed horn replaced by waveguide. Ice on dish
melted. Ripples
JGM
2006/11/30
Holo3f8b2.sdm
104
180
AZ
12.0/12.0
+13
-2.0
3.74e(-3)/0.411
good
Signal feed horn relaced by waveguide. Absorber placed over Tx feed (to test reflection theory). Ripples and astigmatism still present (but maybe a little bit diminished?).
JGM
2006/11/30
Holo3f8b4.sdm
104
180
AZ
12.0/12.0
+13
-2.0
2.02(e-3)/0.315
good
Signal feed horn put back. Absorber placed over Tx feed (to test reflection theory). Ripples and astigmatism still present (but maybe a little bit diminished relative to no-absorber case?).
JGM
2006/11/30
Holo3fc72.sdm
104
180
AZ
12.0/12.0
+13
-2.0
298/3.77
bad
Adjusted panels 7-63 and 11-64 up (i.e. toward the prime focus) by 100 micron. Also rotated signal feed 180 degrees. Amplitude and phase had big jump at start of map. DATA NO GOOD.
JGM


Legacy Maps

Date SDM File Name Quality Comment Observer
5 November 2006
Holo33f9.sdm
bad
RL notes data dropouts and timing problems.
JGM,DTE,RM
6 November 2006
Holo34331.sdm
bad
DSP symmetric failure at start. RL finds many samples with zero position. Bug in data acquisition. Fixed by RS 2006/11/07
JGM,DTE
6 November 2006
Holo34332.sdm
bad
Possible few-percent reference signal saturation. RL finds many samples with zero position. Bug in data acquisition. Fixed by RS 2006/11/07
JGM,DTE,RM
6 November 2006
Holo34333.sdm
bad
NOT EXTRACTABLE FROM ARCHIVE. NOT ANALYZABLE.
JGM
6 November 2006
Holo346f1.sdm
bad
NOT EXTRACTABLE FROM ARCHIVE. Seems to have died with "Failed to invoke 'cleanup' LifeCycle...". Then, the ever popular "other exception"! NOT ANALYZABLE.
JGM
6 November 2006
Holo34711.sdm
bad
No apparent problems noticed. RL finds many samples with zero position. Bug in data acquisition. Fixed by RS 2006/11/07
JGM
6 November 2006
Holo34712.sdm
bad
No apparent problems noticed. RL finds many samples with zero position. Bug in data acquisition. Fixed by RS 2006/11/07
JGM
6 November 2006
Holo34713.sdm
bad
No apparent problems noticed. RL finds many samples with zero position. Bug in data acquisition. Fixed by RS 2006/11/07
JGM
6 November 2006
Holo34714.sdm
bad
No apparent problems noticed. Slightly adjusted attenuation on reference at start of map. RL finds many samples with zero position. Bug in data acquisition. Fixed by RS 2006/11/07
JGM
7 November 2006
Holo34ac1.sdm
bad
Timing drop problem.
JGM
7 November 2006
Holo34d61.sdm
unknown
??
JGM
7 November 2006
Holo34d62.sdm
unknown
??
JGM
7 November 2006
Holo34d63.sdm
bad
Crappy positioning and points with 10**7 amplitudes. Trash.
JGM
8 November 2006
Holo35471.sdm
bad
Attempt at 79 GHz map. Failed. M&C issues (tuneLow does not work, for example).
JGM
8 November 2006
Holo352f1.sdm
bad
Scan and pointing data look ok. Positions still not right. Could not fit for focus. Found later that Tx was tuned to second frequency sidelobe.
JGM
8 November 2006
Holo355d1.sdm
bad
Found later that Tx was tuned to second frequency sidelobe.
JGM
8 November 2006
Holo355d2.sdm
bad
Found later that Tx was tuned to second frequency sidelobe.
JGM


This topic: Main > TWikiUsers > JeffMangum > AlmaHolography > AlmaHolographyMapLog
Topic revision: 2007-06-07, JeffMangum
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