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27: Listen to "single side band" conversations

How do you transmit speech over long distances? You can use "amplitude modulation", where you change the volume of the carrier frequency to model your audio.

As a side effect, the bands to the sides of the carrier will contain a signal, as well.

One trick is to transmit *just* those sidebands, which saves power! But you have to "guess" the base frequency when listening.

SDR++ makes it very easy to play with this! :) Here's someone from Serbia!