[aprssig] Packet Engine

[Alan P. Biddle]

I have found it reliable, except that there are a very few systems where the
sound card function will not work in TX mode.  It seems to be the particular
system, not the particular soundcard.  I have used it on 3 systems.  Two
work fine, and one doesn't, though the rest of the functions are normal.  

Alan
WA4SCA