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GPS + AIS RX/TX : Careful with DC to DC converters
#1
Hi everyone!

I want to share a long-standing issue I’ve been dealing with that drove me absolutely nuts for countless hours as I tried to figure out what was wrong with my system.

For a long time, I experienced intermittent reception issues with my Moitessier 2. After the hack, I thought the device had become unreliable. Sometimes it worked fine, receiving both GPS and AIS signals; other times, it only picked up AIS, or nothing at all—not even connecting to SignalK.

To improve things, I bought a USB GNSS receiver. For a while, it worked well, and Moitessier 2 could detect AIS targets most of the time. It wasn’t perfect, but it was manageable.

Later, I invested in the Maiana AIS, but I couldn’t get it to work reliably. Sometimes it would get a GPS fix; other times, absolutely nothing. AIS reception was sporadic, and it never transmitted properly. It also barely connected to the Mac Arthur Hat. 

Then, one day, all devices stopped receiving any signals from GPS or AIS. It was bizarre!

Finally, I discovered the culprit: a small DC-to-DC converter in my system was generating so much electrical noise that it disrupted all signals completely.

So, here’s my advice: if you’re facing similar issues, check for noisy components like DC-to-DC converters or other potential sources of interference as USB 3.0 SSD cases. It could save you all the time and frustration I went through!
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#2
Glad you found the culprit—who knew a tiny adapter could cause such chaos? Thanks for the tip; I'll be sure to check for noisy neighbors in my setup!
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#3
Glad you found the issue, and thanks for reporting back.

Another common source of RF noise are LED lights, especially the color-changing strings.
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