STAFILE is the name of the external stations file. See Section 3.3 for the required formats. If STAFILE is not specified, it defaults to $SCHED/catalogs/stations_RDBE.dat. If STAFILE='none' is specified then no external catalog will be read.
This must be specified among the first scan inputs since SCHED will read the station catalog while setting up the first scan. If STAFILE is not specified with the first scan's inputs, SCHED will read the default catalog. This is done because, while reading the scans, SCHED needs to know some station information (like codes in case you choose to specify them for the STATIONS input).
Under unix, environment variables may be used. For example, if SCHED is defined to mean /users/cwalker/sched, the base area under which all sched stuff is kept (substitute your local directory), then one can specify the station file with STAFILE = $SCHED/catalogs/stations_RDBE.dat. Use the setenv (c or t shell) or export (korn shell) to set environment variables.