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Post by Admin on Aug 29, 2018 12:46:47 GMT 8
original link here Modulated lightOn the evening of 19 February 2005 the authors spanned a 167 km (104 mile) path between Mount Barrow's South peak and Mount Wellington in Tasmania with audio modulated light beams. This was the culmination of about 35 years of intermittent experiments by the two authors of this web page, initially individually and later in association. The suggestion to try the Barrow-Wellington path originated in a chance comment to Chris Long by Jason Reilly VK7ZJA, that Mount Wellington was visible from the top of Barrow. Jason is a technician for Optus, regularly visiting the transmitter site on Mount Barrow, otherwise we would never have known that crucial piece of information! Both summits are above the 1200 metre contour, and the earth's curvature on the land between only accounts for approximately a 600 metre bulge, with reasonable clearance all along the path. We were surprised to find that the expected rapid optical fading cycles caused by atmospheric turbulence over this long path were not too severe, presumably because the effect rapidly diminishes with elevation.
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