The Challenge: Make a Transmitter and Receiver |
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How did we send
our message?
The buzzer sparked
quite a lot but it was a bright white spark: lots of heat and light but
not much radio energy. The high voltage output from the transformer was
blue. The radio could pick up the buzzer spark but the high voltage output
spark was louder.
When the Morse key
was held down the buzzer buzzed, the current pulsed to the transformer
which stepped up the voltage to several hundred volts producing a nice
bright spark. The radio waves created by the spark (arc) were then radiated
by the antenna which was connected electrically to the arcing terminals
(saw blade) of the output of the transformer. Often we found that we could
not get a reliable arc (probably due to the humidity), so we wired
the output from the transformer (using a common connection) onto the buzzing
switch which created a lovely reliable blue arc.

Receiving the message 
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