[Elecraft] O.T. Morse is not dead, at least in the U.S. Navy

[Bill Frantz]

Back in the day, when people used modems with a LED that blinked 
when transmissions were occurring, someone aimed a telescope at 
the LED and was able to intercept the modem's transmission since 
the LED was operated from the output data stream. When people 
started experimenting, data rates of up to 1 megabit/second were 
achieved. Think about the possibilites for field day. :-)

73 Bill AE6JV

On 11/21/17 at 8:34 PM, ron at cobi.biz (Ron D'Eau Claire) wrote:

>Fred, it's called LiFi and uses the ability of LED light 
>sources to handle high frequency modulation to send data 
>securely since one has to intercept the actual beam to even get 
>the data, much less decode the information. Apparently pretty 
>high data rates are possible with the system.
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Bill Frantz        |"Web security is like medicine - trying to 
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