tvchans c1 c2 [c3 c4] | Where c1 and c2 are the start and stop channels for frequency 1, and optionally, c3 and c4 are the equivalent for frequency 2. |
To return to the default central 50% of each channel type:
tvchans default
For other commands relating to channel selection of the visibility
variables refer to the CACOR commands and use the appropriate commands to set the variables.