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Meridian Amateur Radio Club
MARC Newsletter 2017

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Coaxial

By Frank WG5X

The Spark Gap transmitter, first demonstrated by David Edward Hughes in 1879, was one of the early forms of generating electromagnetic radio waves. If you remember from your high school science, German physicist Henrich Hertz demonstrated that electrical energy does not leave a wire unless the flow of current is being started and stopped. Around the turn of the century, the rotary spark gap oscillator was how this was accomplished. The speed of the motor also controlled the wave length of the transmitted signals. This form of generating radio frequency was extremely broad banded and soon after the perfection of better oscillators was outlawed because it caused so much interference.

The Italian electrical engineer and inventor Guglielmo Marconi is generally credited with being the inventor of radio. For his efforts he received the 1909 Nobel prize in physics. One of the early methods for detecting these radio waves was with a tank circuit attached to a galena crystal and a crude antenna. This was one of the first solid state devices and was soon replaced by the vacuum tube. It took another fifty years for the semiconductor detector to be reinvented.

My Dad (W5MAV) used a spark gap transmitter and a crystal detector receiver when he was the radio operator on a coastal tanker back in the twenties. He was able to acquire an old 1912 spark gap signal receiver when they were replaced with the tube type equipment, and it is still in almost perfect condition. 73 WG5X

 

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