johnsteichen
New Member
- Joined
- Sep 18, 2010
- Messages
- 227
After hooking up my audio outputs to my PMA4000 audio panel, I noticed annoying hum. I did the direct chassis ground hook up with no improvement. I used a dedicated unswitched input into the audio panel. Summing the audio with the audio from the Garmin GTN 750 reduced the total volume just like Dynon said it would. Do not do that!
The good news, after futzing around a bit, I noticed that the hum is probably related to the voltage control on the Dynon screen. When the screen was on full bright, the hum disappeared completely. I can tolerate the hum the few times I need the screen dimmed.
The good news, after futzing around a bit, I noticed that the hum is probably related to the voltage control on the Dynon screen. When the screen was on full bright, the hum disappeared completely. I can tolerate the hum the few times I need the screen dimmed.