Transmitting WSPR with an LED! No radio required.

A demonstration of a simple unbalanced RF mixer to upconvert WSPR Audio to RF 40m band. Although in this case a HackRF One was used to generate an RF Carrier, any other source could have been used such as a crystal or ceramic oscillator, a function generator or even an RPi/Arduino. Transmit power is less than 1mW. No neighbouring signals were hurt during the making of this video!

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