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
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
drvon to power up the motors and release the brakes.
- Specify coorect coordinate mode,
- Specify right ascension (RA) and declination (Dec) coordinates
longit 05:37:23 and
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
rightrate commands, and commence the scans with either
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