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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/FrontPage/ Wiki with up-to-date Notes on NCS (only available locally)]

NCS supports only source coordinates in Equatorial J2000.0 system.

NCS supports observing modes and source offsets in:

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

(More systems will be made available as soon as possible)

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

Observing modes supported by the NCS:

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

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Antenna

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Wobbler

Available under NCS.

$/!\$ Wobbler rotation (actually, secondary rotation) not yet available under NCS.

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Pointing Model

heterodyne: usable, but should be improved (last model update: 2005-11).

bolometer: OK, but could be improved (last model update: 2005-11).

$/!\$ Operator/AOD: Check regularly that secondary/ spindle control, weather data for refraction correction, and automatic P4/P5 are working correctly -- if necessary ask a member of the NCS team for instructions about this (2005-12).BR

$/!\$ Pointing on spectral line sources like SiO masers is not yet available under NCS.

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SIS Receivers

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.

$/!\$ Image/Signal gain-ratio calibration is not yet supported by NCS.

Standard table of T_cold calibration temperatures (same as in old CS) is implemented in NCS; note that this covers only a limited standard range of frequencies. $/!\$ Outside this range, T_cold has to be set manually.

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

$/!\$ HERA is not yet supported by NCS. (to be done for 2006, February).

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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, but is out of operation (2005-11-30)! 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
HERA pointing difficulties using beam switch mode - total power mode gave better results but requires excellent weather BR Wobbler switching may avoid ripple, beam switching is most sensitive to ripple

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HERA

$/!\$ HERA is not yet supported by NCS. To be done for 2006-02.

Second polarization installed. $/!\$ One blind pixel. BR SSB tuning tables for standard frequencies. BR Sideband rejections not determined (2004-12-01 AW) BR

$/!\$ 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 $/!\$ With VESPA, the maximum of 4 spectra per pixel can be used. BR $/!\$ $/!\$ Much higher noise in HERA 2 than HERA 1 when using Vespa. This is being investigated by S. Navarro [RM 30.6.2005]BR $/!\$ When using HERA 1 and 2 configure only 1 Channel for continuum observations in OBS, never-the-less the continuum drifts of all channels are reduced (calibrated) by ODP [AS 11.10.2005]

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Bolometers

Bolometer Observations are supported by the NCS.

Mambo II is installed and ready for operation (AW 2004-12-01)

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Backends

Support by NCS:

Continuum Backends for single-pixel heterodyne receivers supported by NCS
4 MHz Filterbanks supported by NCS
1 MHz Filterbank in parts of 256, 512, 768, or 1024 channels; $/!\$ without frequency shifts.
$/!\$ 100 kHz Filterbank not yet supported by NCS
$/!\$ WILMA not yet supported by NCS
VESPA supported by NCS

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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 so far supports only a restricted set of features!

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Other Items

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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 33 as of 2005-12-23 11:15:21 → ⇥
  Size: 6354
  Editor: HansUngerechts
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
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+#acl RainerMauersberger:read,write WalterBrunswig:read,write SantiagoNavarro:read,write DavidJohn:read,write JuanPenalver:read,write SalvadorSanchez:read,write ManuelRuiz:read,write FernandoAnel:read,write MarianoEspinosa:read,write EnriqueLobato:read,write DavidMartinez:read,write  JuanLuisSantaren:read,write NuriaMarcelino:read,write HansUngerechts:read,write SergioMartin:read,write AlbrechtSievers:read,write AxelWeiss:read,write FredericDamour:read,write GabrielPaubert:read,write KarlSchuster:read,write RosaMontalban:admin,read,write VictorEspigares:admin,read,write All:read
##language:en
#pragma section-numbers off
-Line 3:
+Line 6:
-= Telescope System Status =
-Line 5:
+Line 7:
-''(Date 2004-12-01)''
 Line 12:
-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/FrontPage/ Wiki with up-to-date Notes on NCS (only available locally)]


NCS supports only source coordinates in Equatorial J2000.0 system.

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

(More systems will be made available as soon as possible)

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

Observing modes supported by the NCS:

 * Calibrate (for hetrodyne)
 * Pointing
 * Focus
 * Tip (for bolometer)
 * Track (Frequency Switching)
 * ON-OFF (Position Switching or Wobbler Switching)
 * On-The-Fly Map
-Line 18:
+Line 44:
-OK
+(./) OK
-Line 24:
+Line 50:
-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)
+Available under NCS.
-Line 27:
+Line 52:
-Wobbler rotation implemented. Current range: +/- 60deg (2004-12-01 AW)
+/!\ Wobbler rotation (actually, secondary rotation) not yet available under NCS.
-Line 33:
+Line 58:
-heterodyn: OK (last model update: 2004-11-17 ).
bolometer: OK (last model update: 2004-11-02 ).
+heterodyne: usable, but should be improved (last model update: 2005-11).
-Line 36:
+Line 60:
-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)
+bolometer: OK, but could be improved (last model update: 2005-11).

/!\ Operator/AOD: Check regularly that secondary/ spindle control, weather data for refraction correction, and automatic P4/P5 are working correctly -- if necessary ask a member of the NCS team for instructions about this (2005-12).[[BR]]

/!\ Pointing on spectral line sources like SiO masers is not yet available under NCS.
-Line 43:
+Line 70:
-A, B, C and D receivers are aligned within  3", checked (2003-09-24)
+A, B, C and D receivers are aligned within 3", checked (2003-09-24)
-Line 45:
+Line 72:
-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)
+(./) A, B, C, D receivers are supported by NCS for observations.

/!\ Image/Signal gain-ratio calibration is not yet supported by NCS.

Standard table of T_cold calibration temperatures (same as in old CS) is implemented in NCS; note that this covers only a limited standard range of frequencies.  /!\ Outside this range, T_cold has to be set manually.

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

/!\ HERA is not yet supported by NCS. (to be done for 2006, February).
-Line 53:
+Line 86:
-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 88:
-    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, but is out of operation (2005-11-30)! [[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]]

    HERA pointing difficulties using beam switch mode - total power mode gave better results but requires excellent weather [[BR]] 

    Wobbler switching may avoid ripple, beam switching is most sensitive to ripple
-Line 70:
+Line 107:
-Second polarization installed. One blind pixel.
No SSB tuning tables except for few standard frequencies.
Sideband rejections not determined   (2004-12-01 AW)
+/!\ HERA is not yet supported by NCS. To be done for 2006-02.
-Line 74:
+Line 109:
+Second polarization installed. /!\ One blind pixel. [[BR]]
SSB tuning tables  for  standard frequencies. [[BR]]
Sideband rejections not determined   (2004-12-01 AW) [[BR]]
-Line 75:
+Line 113:
-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.
+/!\ 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]]
/!\ With VESPA, the maximum of 4 spectra per pixel can be used. [[BR]]
/!\ /!\ Much higher noise in HERA 2 than HERA 1 when using Vespa. This is being investigated by S. Navarro [RM 30.6.2005][[BR]]
/!\ When using HERA 1 and 2 configure only 1 Channel for continuum observations in OBS, never-the-less the continuum drifts of all channels are reduced (calibrated) by ODP [AS 11.10.2005]
-Line 82:
+Line 122:
+Bolometer Observations are supported by the NCS.
-Line 89:
+Line 131:
-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 single-pixel heterodyne receivers supported by NCS
 * (./) 4 MHz Filterbanks supported by NCS
 * (./) 1 MHz Filterbank in parts of 256, 512, 768, or 1024 channels; /!\ without frequency shifts.
 * /!\ 100 kHz Filterbank not yet supported by NCS
 * /!\ WILMA not yet supported by NCS 
 * (./) VESPA supported by NCS
-Line 97:
+Line 144:
-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 so far supports only a restricted set of features!
-Line 110:
+Line 159:
-''(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 164:
-'''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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