1918 Ground Current Telegraph

With civilian radio (both transmitting and receiving) shut down for the duration of the war, hams a hundred years ago still had a desire to engage in communications. As we’ve seen prevsiously (here, here, here and here), one method of communicating without the use of radio waves is a ground-conduction telegraph. And a hundred years ago […]

1942 Ground Current Communication

During World War II, Amateur Radio was off the air for the duration. However, unlike the situation in the First World War, hams were allowed to keep their equipment, and there were no restrictions on listening. Hams were eager to communicate, and with radio unavailable, they were eager to explore other possibilities. Starting with the […]

1940 Wireless Telegraph

The gentleman shown above is demonstrating a simple wireless telegraph, the plans for which appeared 75 years ago this month in the December 1940 issue of Popular Science. As you can see from the diagram here, the concept was nothing new, and is quite simple.  The transmitter sends an AF signal of about 75 volts […]

Wireless Goes to War: 1914

A hundred years ago, the wireless had unquestionably established itself as one of the tools of war. On this day in 1914, the Mexican Port of Veracruz was under American occupation after three days of fierce fighting under the command of Admiral Frank Friday Fletcher.  The invasion was a response to the arrival of arms bound […]

Mahlon Loomis: Inventor of Radio?

It’s generally accepted in the history of science and technology that radio couldn’t have been invented until James Clerk Maxwell came up with Maxwell’s Equations in 1865.  That theoretically underpinning of radio were verified experimentally by Heinrich Hertz in 1887.  (Hertz, it turned out, was using electromagnetic waves of about two meters in wavelength, it turns, meaning […]