After hours of trial and error and reading Forum posts and watching YouTubes, I am happy to say I think I have it figured out as my NDBs are now functioning correctly in DCS Nevada Map.
Like some one said, when flying the F-86 or WW2 era planes it nice to at least have a NDB on every field/airport.
Here's a couple of things I wasn't doing correctly.
When using either the Trigger Zone or assigning a NDB to an object it must have a Sound file, either .wav or .ogg. I attached a simple letter E in Morse code which works fine. Remember to check the loop box so it plays continuously. I put my sound file in my Saved Games folder under DCS Mods/Sounds which I had to create.
The Frequency has to be converted from Kilohertz to Megahertz, example 985 KHz = .985 MHz. This .985 is what goes into the Frequency entry.
If assigning to an object using the advanced option you need two entries, one for the frequency and one to broadcast the sound file, which is send message option.
This video has some good info.
https://www.youtube.com/watch?v=RADZkVJYQ8U&t=19s
Thanks RAZO+R for the reply.
Ed
31_The_Number_5.ogg