Addendum to yesterday's post. I  was unable to communicate via pat
because  the  serial TNC  method  was  not working  correctly  and
was  hard  coding settings  that  would  not  allow the  radio  to
communicate. I had to use Winlink  RMS instead. It appears KISS is
the best way to make it work on  Linux. So today I set up KISS and
used the TH-D74  (which is KISS only) on a  mag mount Diamond MR77
dual band antenna.

Turned that semi-victory into a full victory.