CACOR Commands

Enter the following commands only into CACOR. All words that make up commands can be abbreviated to the first four characters. CACOR commands (like all other AT online commands) are not case sensitive. Do not type the square brackets that surround options when entering the command. The letters n and m are used to indicate numbers. For example, in ca0n, replace n with 1-6 to select an antenna.

config

Reconfigure the correlator (see previous section for a complete description of this process).

exit

Exit CACOR.

quit

Exit CACOR.

tda[nt] [f1 [f2]

] Define which antennas are active in the tied array units, and the tied array polarisation mode, linear or circular. f1 is for frequency one, f2 for frequency two. f1 and f2 are a string of antenna numbers, preceded by an optional L or C character, e.g. C1246, meaning that the tied array is in circular polarisation mode and antennas 1,2,4 & 6 are active whilst 3 & 5 are inactive. If no parameters are given the current settings will be printed in the log window. If no polarisation mode is given, the current settings will apply, assumed on restart of the program to be linear.

tdt[sys] n

Open a tied array $Tsys$ log file and write the $Tsys$ values every n integrations. If a file is already open, it will be closed and a new one will be opened. If n = 0, the current file will be closed and $Tsys$ logging will be disabled.

tvb[ins] b1 [b2]

In time or pulsar binning mode, defines which bin is used for the time variables, i.e. the data sent to "vis". Only one bin at each frequency is used to form the time variables. b1 is for frequency 1, b2 for frequency 2.

tvb[ins]

Print the current tvbins selection in the log window.

tvch[ans]

Print the current tvchans selection in the log window.

tvch[ans] c1 c2 [c3 c4]

Defines the range of frequency channels over which averaging occurs for the time variables, i.e. the data sent to CACAL and VIS. This can be very useful if you have a birdie or other very strong interference in the central part of your bandpass. Specify the start (c1) and stop (c2) channels for frequency 1 and, optionally, the start (c3) and stop (c4) channels for frequency 2. The default is to take the central 50% of channels at each frequency.

tvch[ans] default

Resets the channel range used by VIS and CACAL to the default, which is the central 50% of channels at each frequency.

See the information on how these selected visibility variable ranges are used by CACAL, CAOBS and VIS