The Challenge: Make a Transmitter and Receiver
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WARNING: Most unlicensed radio broadcasts are illegal in the U.S. The following is for informational purposes only.
With just a basic
tool kit, some copper wire, a piece of coke, a car battery, a bottle of
rum, and some old kitchen pots and pans would we be able to transmit a signal
across the island and successfully decipher the message?
of signal are we going to transmit?
Since the beginning
of time, people have been trying to communicate over distances greater
than the human voice can travel. More rudimentary attempts included the
use of smoke, fires and waving flags. Mirrors were also used to flash
the image of the sun to distant objects.
the discovery of electricity, a revolution in communication took place.
Wires were stretched from one point to another and an electric current
passed through them, controlled by a switch called a telegraph key. A
light or buzzer could be turned on and off over great distances and using
a simple code, such as the Morse system, people were able to communicate
almost instantly over distances that had previously required days or weeks
by horse or train.
In 1901, Marconi sent
a signal across the Atlantic using the recently discovered radio waves.
It paved the way for today's complex wireless communications systems such
as satellites and mobile phones.
What is a transmitter?