Heliograph - License Free Solar Telegraphy

Started by Luigi, May 24, 2014, 05:58:24 pm

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Heliograph: is a device that can be used to send messages using reflected light (http://en.wikipedia.org/wiki/Heliograph)
From time to time I get old hard drives from my company that need to destroyed. I usually end up keeping the magnets from the drive because they are useful for other applications. The rest of the components are usually discarded. Today I kept the hard drive platters. The platters are highly reflective and very durable.

I think these platters can make an excellent signalling mirror. While not technically radio, it is sending messages using electromagnetic waves in the visual part of the spectrum. No license is required. The durability is much better than a standard mirror.

All that is needed is a tripod, a mounting system and a way to cut/move the beam. In a few minutes on a sunny day, you can signal others and maintain radio silence.