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  #21  
Old 01-20-2019, 09:51 AM
mulde35d's Avatar
mulde35d mulde35d is offline
 
Join Date: Dec 2017
Location: Williamsburg, VA
Posts: 79
Default Sync Wire

I was curious and emailed AeroLED about how much amperage runs through their Sync wire. They said it is about 10 ma or 0.01 Amps (if I did the conversion correctly). Definitely not enough to effect a magnetic field.
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RV-14A #140512 (N122X probably)
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  #22  
Old 01-20-2019, 09:52 AM
JDA_BTR JDA_BTR is offline
 
Join Date: Dec 2013
Location: Baton Rouge, LA
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Default

My setup is stock. Shielded 18G 3 strand in the fuse for nav, strobe, and sync. Unshielded to the tips connected at the wing root. Strobe ground and light ground connect together and run to the wing root where it attaches to fuse. Shield in fuse length grounded at wing root fuse.

Heated pitot with no controller has twisted 14g in the wing with a ground at the wing root.

No noise in my GMA245 audio from lights or strobe. All AeroLED. Gmu22 in the left wing doesnít blip at all. Probably will help to look at your audio jacks and make sure they arenít grounded in any way and that your shields for audio are exactly per plans.
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  #23  
Old 01-20-2019, 06:38 PM
Mudfly Mudfly is offline
 
Join Date: Dec 2011
Location: Alpharetta, Ga
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Default Thanks

Thanks guys for the info and ideas.
Jon, I like the idea of keeping the sync wire separate and using the third conductor in the shielded wire for the ground. The only reason I was going to use the shield as ground is because I believe I remember reading that method "may" reduce the magnetic field better. I may need that capability due to the location of my magnetometer in the left wing. However, I'll need more information as to whether using the shield as a ground return is an accepted practice in the aviation world. Using the shield as "shield only", if I recall correctly, provides better reduction of external noise..radio interference , etc. Based on that info, your plan seems solid since you are mounting the magnetometer in the tail cone.
This seems like one of those areas where there are a few right answers. I just need to make a decision and move forward.
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  #24  
Old 01-20-2019, 07:30 PM
JDA_BTR JDA_BTR is offline
 
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You should use the third wire for ground. It is twisted with the other two so will mitigate any magnetic flux effect of the varying DC current. If you make the shield the return ground you don't get that benefit.
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  #25  
Old 01-21-2019, 11:43 AM
Mudfly Mudfly is offline
 
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JDA_BTR . You talked me into it. I'm going with the shielded 3 conductor, and will use the 3rd wire as a real ground vs using the shield. Final answer!
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RV-14A (140174)
www.myrv14build.blogspot.com
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Last edited by Mudfly : 01-21-2019 at 06:26 PM.
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