It’s time to use your Morse paddle and transmitter to send some messages! Turn on your AM radio, tune it to 540AM, and power up the Gemma M0.

Tap out your secret messages — you could be hidden away in a secret location sending information to an operative nearby with an AM receiver and discrete earphone and nobody will ever know!

This guide was first published on Mar 08, 2018. It was last updated on May 17, 2024.

This page (Send Secret Messages) was last updated on Mar 08, 2024.

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