Thanks Jones, this is making more sense. The noisy tones are '- - - . . . - - - . . ', so at least there is what is an O and an S in there, but separation of audible tones might be muffled effecting my interpretation. On another note, SQL is maxed, and the tone is still coming through. WRAK968: I'll grab a recording after I find the time to drive further out from my home toward ROS NDB to see if the ROS theory holds true. I pinged a pilot in the family to learn a little more about that side of things. Best, S.