So it turns out there are a bunch more digital modes that this beacon can transmit. Digging into the original project by Etherkit here, there's a related link that shows Hellschreiber. Checking out Etherkits' github page shows two Arduino libraries:
- Si5351 Library - https://github.com/etherkit/Si5351Arduino
- JTEncode Library - https://github.com/etherkit/JTEncode
The JTEncode library offers JT65, JT9, JT4, or WSPR as well as FSQ at 2, 3, 4.5 and 6 baud. Looks like most of my heavy lifting is done on the Arduino side. Which is great I can repurpose the beacon depending on the sketch I load onto it. I haven't played much with the weak signal modes yet, it's on my TODO, but I'm trying to limit myself to a defined set of projects I can realistically complete rather than go down many tangents.