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Navigation in the 1940s: The Four Course Radio Range

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Uploaded on Apr 8, 2010

Click to download Approach Plate A http://goo.gl/LPO4c
Click to download Approach Plate B http://goo.gl/ktnKR

Recently, the staff of Radio Station WWRB and its parent company, Airline Transport Communications Inc. put together a model four course radio range, operated by control operators WA4SZE and KF4MVG. The original four course ranges were very large because they operated in the very low frequency range, requiring 200 foot high towers with wide spacing. This model system operates in the high frequency 28 MHz band, so it is much smaller. Despite the size difference, it is functionally identical to its 1930s-1970s forebears.

We'll be setting up a web page on the four course range soon with construction plans, photographs, history, and schematics for amateur radio operators to build their own ranges. More information on four course ranges can be found at http://en.wikipedia.org/wiki/Low_Freq...

The staff of Airline Transport Communications, Inc and Radio Station WWRB have been experimenting with various aircraft navigation systems for several years. If you would like to see pictures of our nondirectional beacon LYQ or our VOR, please see our web site photo gallery at http://www.wwrb.org .

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