hi guys! i have always been confused by the systems of navigation:see the picture:what does the tone and ANT/ADF do?what about the one above: voive/both/range(V/B/R) ?thanks!

anybody there>?

Have a read of this: http://www.avweb.com/news/avionics/183233-1.html

thanks man but PMDG didn't seem to simulate the ANT mode?

No, I doubt you even could in FS. Anyways, ANT and BFO, I've never had to use that anywhere. Guess in a few years those will be relicts from past times.