[aprssig] Filter port 14580

[Robbie, wa9inf]

Ok, I've changed my filter string to several different configurations, I 
still am being fed Europe, Africa, Australia and South America stations, 
as well as from all over the U.S. 

I've rebooted the computer, makes no change. I guess some recent changes 
in the filter software, Case sensitive, is the culprit or what?

What is my problem? Help!

Robbie