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System - General

$/!\$ The 30-m telescope is now operating using the New Control System (NCS) (2005-11-30 HU)

[http://www.iram.es/IRAMES/ncs30m/ NCS documentation]
[http://mrt-lx1/mainWiki/ Wiki with up-to-date Notes on NCS]

NCS supports only source coordinates in Equatorial J2000.0 system. (More systems will be made available as soon as possible)

Observations near and towards the Sun are not yet supported.

NCS supports observing modes and source offsets in:

Projection "Radio" (same offsets as in old CS) in Equatorial J2000.0
"true angle" horizontal
Nasmyth (receiver offsets)

All 4 Switching Modes are supported by the NCS (total power, beam switching, wobbler switching, frequency switching.)

Observations with "rotated" wobbler and the bolometer are now possible within the pool; contact Stephane Leon and/or Hans Ungerechts on how to prepare such observations. After finishing with rotated Wobbler, make sure that the operator puts the rotation back to exactly 0 degrees.

Observing modes supported by the NCS:

Calibrate (for heterodyne)
Pointing
Focus
Tip
Track (Frequency Switching)
ON-OFF (Position Switching or Wobbler Switching)
On-The-Fly Map
VLBI

Automatic calibration and processing of heterodyne data using the MIRA software is in operation for all observing modes. MIRA can also be used manually and offline.

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Antenna

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Wobbler

Available under NCS.

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Pointing Model

The Pointing Model is maintained with respect to the receiver B100. The misalignment and focus error (D-focus) of the other receivers with respect to B100 is the following:

  Rx       misal.(")       date            D_focus(mm)       date
 A100     0.16 ±0.06     27-Feb-07,        +0.09 ±0.03     13-Mar-07
 A230     1.34 ±0.18     27-Feb-07,        +0.43 ±0.02     13-Mar-07
 B100     0.00                              0.00
 B230     1.74 ±0.16     27-Feb-07,        +0.33 ±0.04     13-Mar-07
 C150     1.26 ±0.24      5-Feb-07,
 C270     0.78 ±0.18      5-Feb-07,
 D150     1.03 ±0.13     12-Mar-07,        +0.26 ±0.02     12-Mar-07
 D270     1.40 ±0.19     12-Mar-07,        +0.18 ±0.05     12-Mar-07

heterodyne: OK, (last model update: 2007-01-31).

bolometer: OK, (last model update: 2007-01-30).

attachment:pointingCorrBolo-Dec06-Feb07small.png

Azimuth (blue triangles), Elevation (red crosses) pointing corrections with Mambo2 during the period December'06-February'07 (SL, Feb 2007)

$/!\$ Pointing on spectral line sources like SiO masers is not yet supported by the data processing.

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SIS Receivers

A, B, C, D receivers are supported by NCS for observations.

Image/Signal gain-ratio calibration is supported by NCS.

[http://gra-lx1.iram.es/mainWiki/ReceiverGroupColdloadPlots A standard table of T_cold] calibration temperatures (same as in old CS) for A, B, C, D receivers is implemented in NCS with an additional scaling/correction factor; note that this covers only a limited standard range of frequencies. $/!\$ Outside this range, T_cold has to be set manually.

$/!\$ Temporarily, the standard calibration system for A, B, C, D receivers is out of operation. It is replaced by using a container of L-N2. For this the T_cold temperature for these receivers at all frequencies should be set to 77K; this needs to be done manually in paKo. (2007-02-16 HU).

$/!\$ Receiver C150 shows low continuum signal at the higher frequencies (>168 GHz). It has to be fully checked. Use D150 instead. (2005-11-16)

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HERA

HERA is supported by the NCS. (2006-02 HU)

Second polarization installed. BR One previously blind pixel is now fixed (2006-04). BR SSB tuning tables for standard frequencies. BR Sideband rejections not determined (2004-12-01 AW). Use standard value of 0.1! BR

For HERA calibration, measured values of the load temperatues are automatically used!

$/!\$ Watch the computer control of the derotator closely (2002-12-22). BR $/!\$ Make sure the derotator tracking is stopped after observations, i.e, set to zero degrees in "frame". BR

HERA 2 is more noisy than HERA 1, limiting HERA2's useful frequency range to below about 242 GHz (2006-09-27 HU according to info from SN)BR

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Pointing and Flux monitoring with SIS receivers:

Continuum instability ("ripple") can occur with all receivers, making pointing and focusing difficult.

In general some receivers are better then others in this respect as summarized here:

A100 generally OK for pointing. (2003-11-12) BR B100 OK, is best for pointing. B100 is the standard reference for the heterodyne pointing modelBR $/!\$ C150 often bad for pointing, ripple. (2002-07-16) BR D150 generally good performance for pointing.(2002-07-16) BR $/!\$ A230 often unstable, bad for pointing and flux monitoring. (2003-11-12) BR B230 OK BR $/!\$ C270 very bad for pointing at 265 Ghz. (2002-07-16) BR $/!\$ D270 can be unstable and difficult for pointing. (2002-07-16) BR
With HERA pointing may be difficult using beam switch mode - total power mode may give better results but requires excellent weather BR

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Bolometers

Bolometer Observations are supported by the NCS.

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Backends

Support by NCS:

Continuum Backends for heterodyne receivers
4 MHz Filterbanks
1 MHz Filterbank in parts of 256, 512, 768, or 1024 channels
100 kHz Filterbank only for receivers in "narrow" mode (this includes A100 and B100)
WILMA is supported by NCS for observations with HERA (2006-02 HU)
VESPA
ABBA for MAMBO bolometer

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Computer/Software

$/!\$ The 30-m telescope is now operating using the New Control System (NCS) (2005-11-30 HU). Note that the NCS supports most essential features, but still has some limitations!

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Other Items

Remote observing via VNC is available on a trial basis from Granada. Coordinate with Walter Brunswig.

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Updates/History

To see the changes between the actual and the last version, please see Show Changes in the Wiki Interface. If you want to see the Revision History of this page, please see Get Info in the Wiki Interface.

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Legend

: OKBR $/!\$ : WarningBR : ErrorBR

The wiki markup of these icons is:

{{{(./) : OK $/!\$ : Warning : Error }}}

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-  ⇤ ← Revision 1 as of 2005-04-21 16:25:33 → 
  Size: 4572
  Editor: gra-lx8
  Comment:
+   ← Revision 74 as of 2007-03-29 10:25:13 → ⇥
  Size: 7083
  Editor: ManuelRuiz
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 1:
+##language:en
#pragma section-numbers off
-Line 3:
+Line 5:
-= Telescope System Status =
-Line 5:
+Line 6:
-''(Date 2004-12-01)''
-Line 12:
+Line 11:
-NORMAL OPERATION
+/!\ The 30-m telescope is now operating using the New Control System (NCS) (2005-11-30 HU)

 [http://www.iram.es/IRAMES/ncs30m/ NCS documentation]

 [http://mrt-lx1/mainWiki/ Wiki with up-to-date Notes on NCS]


NCS supports only source coordinates in Equatorial J2000.0 system. 
(More systems will be made available as soon as possible)

Observations near and towards the Sun are not yet supported.

NCS supports observing modes and source offsets in:
 * Projection "Radio" (same offsets as in old CS) in Equatorial J2000.0 
 * "true angle" horizontal
 * Nasmyth (receiver offsets)


All 4 Switching Modes are supported by the NCS (total power, beam switching, wobbler switching, frequency switching.)  

 * (./) Observations with "rotated" wobbler and the bolometer are now possible within the pool; contact Stephane Leon and/or Hans Ungerechts on how to prepare such observations. After finishing with rotated Wobbler, make sure that the operator puts the rotation back to exactly 0 degrees.

Observing modes supported by the NCS:

 * Calibrate (for heterodyne)
 * Pointing
 * Focus
 * Tip
 * Track (Frequency Switching)
 * ON-OFF (Position Switching or Wobbler Switching)
 * On-The-Fly Map 
 * VLBI

(./) Automatic calibration and processing of heterodyne data using the MIRA software is in operation for all observing modes. MIRA can also be used manually and offline.
-Line 18:
+Line 50:
-OK
+(./) OK
-Line 24:
+Line 56:
-Avoid wobbler throw of 120"; with a throw of 120" the specification of a phase time may not work properly.  With a throw of 119 or 121 is should be OK. (2003-07-09)
Results from first pointing after unlocking the wobbler can be  wrong! Usually it's sufficient to ignore the first pointing and repeat the pointing (2003-07-09)

Wobbler rotation implemented. Current range: +/- 60deg (2004-12-01 AW)
+Available under NCS.
-Line 33:
+Line 62:
-heterodyn: OK (last model update: 2004-11-17 ).
bolometer: OK (last model update: 2004-11-02 ).
+The Pointing Model is maintained with respect to the receiver B100. The misalignment and focus error (D-focus) of the other receivers with respect to B100 is the following:
-Line 36:
+Line 64:
-Operator/AOD: Check regularly that automatic P4 P5  is working (2002-12-13).
Narrowband continuum pointing (for SiO masers) is out of service! (2003-07-09, 2003-07-30)
+{{{
  Rx       misal.(")       date            D_focus(mm)       date
 A100     0.16 ±0.06     27-Feb-07,        +0.09 ±0.03     13-Mar-07
 A230     1.34 ±0.18     27-Feb-07,        +0.43 ±0.02     13-Mar-07
 B100     0.00                              0.00
 B230     1.74 ±0.16     27-Feb-07,        +0.33 ±0.04     13-Mar-07
 C150     1.26 ±0.24      5-Feb-07,
 C270     0.78 ±0.18      5-Feb-07,
 D150     1.03 ±0.13     12-Mar-07,        +0.26 ±0.02     12-Mar-07
 D270     1.40 ±0.19     12-Mar-07,        +0.18 ±0.05     12-Mar-07
}}}

heterodyne: OK, (last model update: 2007-01-31).

bolometer: OK, (last model update: 2007-01-30).

attachment:pointingCorrBolo-Dec06-Feb07small.png 

Azimuth (blue triangles), Elevation (red crosses) pointing corrections with Mambo2 during the period December'06-February'07 (SL, Feb 2007)

/!\ Pointing on spectral line sources like SiO masers is not yet supported by the data processing.
-Line 43:
+Line 90:
-A, B, C and D receivers are aligned within  3", checked (2003-09-24)
+(./) A, B, C, D receivers are supported by NCS for observations.
-Line 45:
+Line 92:
-Calibration Tcold temperatures have been checked by receiver group.
New scaling factor of 1.0 has been implemented into obs.
Obs Tcold should be ok (2004-01-17)
+(./) Image/Signal gain-ratio calibration is supported by NCS.

(./) [http://gra-lx1.iram.es/mainWiki/ReceiverGroupColdloadPlots A standard table of T_cold] calibration temperatures (same as in old CS) for A, B, C, D receivers is implemented in NCS with an additional scaling/correction factor; note that this covers only a limited standard range of frequencies.  /!\ Outside this range, T_cold has to be set manually. 

/!\ Temporarily, the standard calibration system for A, B, C, D receivers is out of operation.  It is replaced by using a container of L-N2.  For this the T_cold temperature for these receivers at all frequencies should be set to 77K; this needs to be done manually in paKo. (2007-02-16 HU).

/!\ Receiver C150 shows low continuum signal at the higher frequencies (>168 GHz). It has to be fully checked. Use D150 instead. (2005-11-16)

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== HERA ==

(./) HERA is supported by the NCS. (2006-02 HU)

Second polarization installed. [[BR]]
(./) One previously blind pixel is now fixed (2006-04). [[BR]]
SSB tuning tables  for  standard frequencies. [[BR]]
Sideband rejections not determined   (2004-12-01 AW).  Use standard value of 0.1! [[BR]]

(./) For HERA calibration, measured values of the load temperatues are automatically used!

/!\ Watch the computer control of the derotator closely (2002-12-22). [[BR]]
/!\ Make sure the derotator tracking is stopped after observations, i.e, set to zero degrees in "frame". [[BR]]

HERA 2 is more noisy than HERA 1, limiting HERA2's useful frequency range to below about 242 GHz (2006-09-27 HU according to info from SN)[[BR]]
-Line 53:
+Line 122:
-Continuum instability ("ripple") can occur with all receivers, making pointing and focussing difficult.
 In general some receivers are better then others in this respect as summarized here:
+Continuum instability ("ripple") can occur with all receivers, making pointing and focusing difficult.
-Line 56:
+Line 124:
-    A100 generally OK for pointing. (2003-11-12)
    B100 OK, will be replaced  (2003-11-12)
    C150 often bad for pointing, ripple. (2002-07-16) 
    D150 generally good performance for pointing.(2002-07-16)
    A230 often unstable, bad for pointing and flux monitoring. (2003-11-12) 
    B230 OK, will be replaced (2003-11-12)
    C270 very bad for pointing at 265 Ghz. (2002-07-16)
    D270 can be unstable and difficult for pointing. (2002-07-16)
    HERA pointing difficulties using beam switch mode - total power mode gave better results (2004-01-17)
+In general some receivers are better then others in this respect as summarized here:

    A100 generally OK for pointing. (2003-11-12) [[BR]]
    B100 OK, is best for pointing. B100 is the standard reference for the heterodyne pointing model[[BR]]
    /!\ C150 often bad for pointing, ripple. (2002-07-16) [[BR]]
    D150 generally good performance for pointing.(2002-07-16) [[BR]]
    /!\ A230 often unstable, bad for pointing and flux monitoring. (2003-11-12) [[BR]]
    B230 OK [[BR]]
    /!\ C270 very bad for pointing at 265 Ghz. (2002-07-16) [[BR]]
    /!\ D270 can be unstable and difficult for pointing. (2002-07-16) [[BR]]

    With HERA pointing may be difficult using beam switch mode - total power mode may give better results but requires excellent weather [[BR]]
-Line 68:
+Line 139:
-== HERA ==

Second polarization installed. One blind pixel.
No SSB tuning tables except for few standard frequencies.
Sideband rejections not determined   (2004-12-01 AW)


Watch the computer control of the derotator closely (2002-12-22). 
Make sure the derotator tracking is stopped after observations, i.e, set to zero degrees in "frame".
With VESPA, only two spectra per pixel can be used.

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-Line 83:
+Line 142:
-Mambo II is installed and ready for operation (AW 2004-12-01)
+(./) Bolometer Observations are supported by the NCS.
-Line 89:
+Line 148:
-MHz shift in 100kHz FB header (AW 2004-12-01)
 Software and/or hardware problem in the 1MHz FB  - problem is currently investigated (AW 2004-12-01)
 Spikes in VESPA at intersection of different units (AW 2004-12-01)
+Support by NCS:

 * (./) Continuum Backends for heterodyne receivers
 * (./) 4 MHz Filterbanks
 * (./) 1 MHz Filterbank in parts of 256, 512, 768, or 1024 channels
 * (./) 100 kHz Filterbank ''only'' for receivers in "narrow" mode (this includes A100 and B100)
 * (./) WILMA is supported by NCS for observations with HERA (2006-02 HU) 
 * (./) VESPA
 * (./) ABBA for MAMBO bolometer
-Line 97:
+Line 162:
-Mirroring between IRAM Grenoble ( http://www.iram.fr ) and Granada( http://www.iram.es/ ) websites sometimes takes several days to update.   (2003-07-01)
+/!\ The 30-m telescope is now operating using the New Control System (NCS) (2005-11-30 HU). Note that the NCS supports most essential features, but still has some limitations!
-Line 103:
+Line 168:
-OK
+ * (./) Remote observing via ''VNC'' is available on a trial basis from Granada.  Coordinate with Walter Brunswig.
-Line 110:
+Line 175:
-''(in reverse order by date!)''

    2004-12-01 AW [[BR]]
    2004-07-24 RM [[BR]]
    2004-03-24, 25 HU [[BR]]
    2004-01-17 AW [[BR]]
    2003-11-12 HU [[BR]]
    2003-09-25 MR [[BR]]
    2003-09-08 HU [[BR]]
    2003-08-20 HU [[BR]]
    2003-08-05 AS [[BR]]
    2003-07-09 RM [[BR]]
    2003-07-01,04/5, 7 HU [[BR]]
    2003-06-08, 09 HU [[BR]]
    2003-04-22, 26 HU [[BR]]
    2003-04-06 AS [[BR]]
    2003-03-31 HU [[BR]]
    2003-03-20 RM [[BR]]
    2003-02-11 AW [[BR]]
    2003-01-10, 2003-01-17, 2003-02-05 RM [[BR]] 
    2003-01-14 TG [[BR]]
    2003-01-03, 06 HU [[BR]]
    2002-12-31 HU [[BR]]
    2002-12-21, 22 HU [[BR]]
    2002-12-19 RM [[BR]]
    2002-12-13, 14, 15, 16 HU [[BR]]
    2002-12-11 RM [[BR]]
    2002-12-05  TG [[BR]]
    2002-11-27 RM [[BR]]
    2002-11-05 AW [[BR]]
    2002-10-18 DJ [[BR]]
    2002-10-15 DJ [[BR]]
    2002-10-09, 12, 14 HU [[BR]]
    2002-10-08 AW [[BR]]
    2002-09-27 TG [[BR]]
    2002-09-26 DJ [[BR]]
    2002-09-23 AW [[BR]] 
    2002-09-11/12, 17 HU [[BR]]
    ... (?) [[BR]]
    2002-08-07,10 HU [[BR]]
    2002-07-22 DJ [[BR]]
    ... (?) [[BR]]
    2002-07-16  HU [[BR]]
    ... (?) [[BR]][[BR]]
+To see the changes between the actual and the last version, please see '''''Show Changes''''' in the Wiki Interface. 
If you want to see the Revision History of this page, please see '''''Get Info''''' in the Wiki Interface.
-Line 157:
+Line 180:
-'''Created by R. Mauersberger, June 18th, 2002'''
+== Legend ==

(./) : OK[[BR]]
/!\ : Warning[[BR]]
{X} : Error[[BR]]


The wiki markup of these icons is:

{{{(./) : OK
/!\ : Warning
{X} : Error
}}}

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