Andy, If you are looking at frequencies for your Winmor operation in the auto control subbands I can suggest some frequencies to avoid since they are the primary NTS Digital operating frequencies..with Pactor 1, 2, and 3. NTS Digital for the most part only operates in the auto control subbands and we are using Winlink Classic which does have a busy detector.
3591.9 3593.9 7100.4 7102.4 10140.9 and 10142.9.... 14095.9 14097.9 and 14112.4 Good luck . 73 Dave WB2FTX Eastern Area Digital Coordinator- National Traffic System Digital