it's a silly historical artifact of OP25 that when -T is in use the CC frequency is
taken from the trunk TSV file, but you still have to give a valid (dummy) frequency on the
command line with the -f parameter. As far as the trunk TSV there is the trunk control
channel frequency (or a comma separated list of CC frequencies), and separately there is
the "center" frequency. I recommend setting that to zero (unless the
log-all-talkgroups-to-disk mode is being used). Likewise use "-S 1000000",
unless the logging mode is being used.
Max