There's a fairly active Winradio group on
http://www.qth.net, and a much smaller one on
http://groups.yahoo.com. You might find some more
specific answers there.
As to ACARS, I'm not sure how the Digital Suite
is set up, but unlike most digital modes, you *must*
have the squelch open at all times. The reason is
that there is brief sync tone before each transmission-
if that tone isn't heard, the software won't sync
up.
Good Luck and 73s Mike
ka3jjz@erols.com