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Samtest

MtPleasant26m.Samtest History

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March 21, 2012, at 03:24 AM by JMc -
Changed lines 32-43 from:

drvon→switch ON the antenna drives
park put the antenna in its normal power-OFF position
longit hh mm ss specify the right ascension (RA) of the radio source
latit dd mm ss specify the declination (Dec) of the radio source
coord b1950 specify the coordinate mode for RA/Dec
slew move antenna to the specified RA and Dec and track
leftlength d.d specify length (deg) of RA scan (choose 1.0–2.0)
rightlength d.d specify length (deg) of Dec scan (choose 1.0–2.0)
leftrate d.d specify rate (deg/min) of RA scan (choose 0.5–1.0)
rightrate d.d specify rate (deg/min) of Dec scan (choose 0.5–1.0)
leftscan execute a scan in RA using parameters specified in leftlength and leftrate
rightscan execute a scan in Dec using parameters specified in rightlength and rightrate

to:

drvon→switch ON the antenna drives
park→ put the antenna in its normal power-OFF position
longit hh mm ss→specify the right ascension (RA) of the radio source
latit dd mm ss→specify the declination (Dec) of the radio source
coord b1950→specify the coordinate mode for RA/Dec
slew→ move antenna to the specified RA and Dec and track
leftlength d.d→ specify length (deg) of RA scan (choose 1.0–2.0)
rightlength d.d→ specify length (deg) of Dec scan (choose 1.0–2.0)
leftrate d.d→ specify rate (deg/min) of RA scan (choose 0.5–1.0)
rightrate d.d→ specify rate (deg/min) of Dec scan (choose 0.5–1.0)
leftscan→ execute a scan in RA using parameters specified in leftlength and leftrate
rightscan→ execute a scan in Dec using parameters specified in rightlength and rightrate

March 21, 2012, at 03:23 AM by JMc -
Changed lines 28-29 from:

to scan across the source. You can set up the length and rate of the scans with the leftlength , leftrate, rightlength and ‘@rightrate@’ commands, and commence the scans with either leftscan or rightscan.

to:

to scan across the source. You can set up the length and rate of the scans with the leftlength , leftrate, rightlength and rightrate commands, and commence the scans with either leftscan or rightscan.

Changed line 32 from:

drvon switch ON the antenna drives\\

to:

drvon→switch ON the antenna drives\\

March 21, 2012, at 03:22 AM by JMc -
Changed lines 28-29 from:

to scan across the source. You can set up the length and rate of the scans with the leftlength , leftrate, rightlength and rightrate commands, and commence the scans with either leftscan or rightscan.

to:

to scan across the source. You can set up the length and rate of the scans with the leftlength , leftrate, rightlength and ‘@rightrate@’ commands, and commence the scans with either leftscan or rightscan.

Changed line 32 from:

drvon switch ON the antenna drives\\

to:

drvon switch ON the antenna drives\\

March 21, 2012, at 03:21 AM by JMc -
Changed line 22 from:
  • Use @@drvon@ to power up the motors and release the brakes.
to:
  • Use drvon to power up the motors and release the brakes.
Changed lines 32-45 from:

drvon switch ON the antenna drives park put the antenna in its normal power-OFF position longit hh mm ss specify the right ascension (RA) of the radio source latit dd mm ss specify the declination (Dec) of the radio source coord b1950 specify the coordinate mode for RA/Dec slew move antenna to the specified RA and Dec and track leftlength d.d specify length (deg) of RA scan (choose 1.0–2.0) rightlength d.d specify length (deg) of Dec scan (choose 1.0–2.0) leftrate d.d specify rate (deg/min) of RA scan (choose 0.5–1.0) rightrate d.d specify rate (deg/min) of Dec scan (choose 0.5–1.0) leftscan execute a scan in RA using parameters specified in

                leftlength and leftrate

rightscan execute a scan in Dec using parameters specified in

                rightlength and rightrate
to:

drvon switch ON the antenna drives
park put the antenna in its normal power-OFF position
longit hh mm ss specify the right ascension (RA) of the radio source
latit dd mm ss specify the declination (Dec) of the radio source
coord b1950 specify the coordinate mode for RA/Dec
slew move antenna to the specified RA and Dec and track
leftlength d.d specify length (deg) of RA scan (choose 1.0–2.0)
rightlength d.d specify length (deg) of Dec scan (choose 1.0–2.0)
leftrate d.d specify rate (deg/min) of RA scan (choose 0.5–1.0)
rightrate d.d specify rate (deg/min) of Dec scan (choose 0.5–1.0)
leftscan execute a scan in RA using parameters specified in leftlength and leftrate
rightscan execute a scan in Dec using parameters specified in rightlength and rightrate

March 21, 2012, at 03:20 AM by JMc -
Added lines 1-45:

Samtest is a small program that provides low-level access to the samplers. This is occasionally used at Ceduna for remote coherence checks and can be used with bruce or vdesk to record scans.

The usage is
samtest -n 2 -i 0 -f 847 -s T -o filename sam26m
where T is the duration of the recording (in seconds) and filename is the filename that the data will be written to. The program produces a file in the Octave format, so ending the filename with .oct is recommended.

You can use vdesk to control the telescope for scans, and some instructions are included below.

You must first have permission from the observatory manager or the next most responsible person on-site before starting the antenna motors or moving the antenna. Be aware that it is not always safe to move the antenna.

The most straightforward way of controlling the antenna is with the vdesk program which can be started either from the link on the newsmerd desktop or from the command line (with the command vdesk, naturally enough). Listed here are the commands that you will find most useful which are entered into the vdesk command line. The normal procedure for moving the antenna is

  • Use @@drvon@ to power up the motors and release the brakes.
  • Specify coorect coordinate mode, coord b1950
  • Specify right ascension (RA) and declination (Dec) coordinates with longit 05:37:23 and latit −45:34:34.
  • Use slew to move the antenna to the source.
  • Once the antenna is on- source use the scanning parameters and commands

to scan across the source. You can set up the length and rate of the scans with the leftlength , leftrate, rightlength and rightrate commands, and commence the scans with either leftscan or rightscan.

Useful commands:

drvon switch ON the antenna drives park put the antenna in its normal power-OFF position longit hh mm ss specify the right ascension (RA) of the radio source latit dd mm ss specify the declination (Dec) of the radio source coord b1950 specify the coordinate mode for RA/Dec slew move antenna to the specified RA and Dec and track leftlength d.d specify length (deg) of RA scan (choose 1.0–2.0) rightlength d.d specify length (deg) of Dec scan (choose 1.0–2.0) leftrate d.d specify rate (deg/min) of RA scan (choose 0.5–1.0) rightrate d.d specify rate (deg/min) of Dec scan (choose 0.5–1.0) leftscan execute a scan in RA using parameters specified in

                leftlength and leftrate

rightscan execute a scan in Dec using parameters specified in

                rightlength and rightrate
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Page last modified on March 21, 2012, at 03:24 AM