We have put up on you tube a Video of an actual Four course Radio
Range Station that we built and placed on the air. . The four course
radio range system was the backbone navigation system used world wide
from 1928 to 1970 until replaced by the VOR. We have actual flying
with Audio of what the four course radio range sounded like to pilots
in flight! To view go to you tube,.... In the search bar enter : Four
Course Radio Range you will see a picture with the caption
navigation in the 1940's You will enjoy this video as this is
aviation history that is not talked about much
Please feel free to make any comments on the you tube page