I cannot get HRD to work with my FT-450AT.  It displays that it can't read the frequency.  I have a straight through DB-9 cable with a serial/usb converter.  It won't work either way.  This is becoming exceptionally frustrating.  If anybody can help me with this, I would deeply appreciate it.  You can reply to this, but if you can also copy it and send me an email, I would also appreciate it.  Thanks!  Steve 
kj4kki@kj4kki.com