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7 MHz cheap and chirpy CW transmitter

There is a certain basic elegance in being heard hundreds or thousands of kilometres away with a one-transistor transmitter using a handful of components. The game is to get the most power out with the cleanest signal while not breaking the crystal or burning out the transistor. These videos describe my experiments with a 7 MHz CW transmitter using just one active transistor. It's based on a design from SV3ORA's website.


 

 

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