Previously I'd installed a 470 uF cap across the essential buss but still have some alternator whine on the GoPro audio when playing back audio. I installed a .47 uF mylar capacitor across the main alternator's output and ground to filter the AC ripple out. The pitch trim motor also creates some noise but isn't terrible. I'll see if the .47 uF cap resolves the whine and motor noise. Also need to check whether the whine is worse using Com 1 or 2.
Dynon database and charts were updated. Connector screws were checked. The copilot side display screws were a tiny bit loose but the connector was pretty secure. I reseated the displays ethernet connectors and Wi-Fi dongles.
I installed some more ferrite beads on unshielded nose gear wires that were close to the transponder antenna.
The fuel filter screen was cleaned and reinstalled.
Update - The GoPro audio alternator whine level seems improved. It seems to make a difference which platform (Windows/iPad/iPhone/Linux) you watch it on and also how high the volume is. The noise is less raspy/buzzy than it used to be.
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