Albert James Myer was a telegrapher and physician who began his military career in 1854 as an Assistant Surgeon in the U.S. Army. Fascinated by non-verbal methods of communication, Myer devised a scheme for transmitting a kind of binary code through the use of a single flag by day and kerosene lamp by night.
HAM Radio 101 - Intro to Repeaters - Geek Prepper
Very Rare WWII Enigma Cipher Machine. This highly important three-rotor Enigma deciphering machine was used by the Nazis during World War II. It is believed that acquisition of an Enigma, and the subsequent deciphering of the German codes by the Allies, shortened the war in Europe by at least two years. Examples of Enigma machines are exceptionally rare and almost all known models are in museums.
Survival Communications- More Resources For Passing Your HAM Technician Test
Cloud Computing and the Mobile Enterprise [Infographic]
#CloudComputing and the Mobile Enterprise [#Infographic]
Esta foto tomada de http://content.time.com/time/photogallery/0,29307,1636836_1389493,00.html Muestra como experimentaban los policias de Chicago con los primeros telefonos radio. 1922