Is this likely to be an issue? Magnetic Interference

[edhunter]

Installed my dual Dynon ADAHRS units using the Van's supplied mount. Only issue was the location was where the previous owner had installed the Garmin GPS antenna. I spaced the ADAHRS unit forward to clear the antenna , not even considering the proximity might be an issue. The GPS is installed w/ SS screws/nuts, and the coax connector is very close as well. I used brass to install the ADAHRS.
What is the likelihood I'll have magnetic interference? Wondering if I should move it all now, or wait and see...

 

[MacCool]

You could call Rob Hickman at advanced flight, but I seriously doubt that's gonna work. My previous installation had a magnetometer there and I know that the previous owner had to relocate the Garmin GPS antenna to under the cowl because it interfered with both calibration of the compass and functionality of the GPS.

 

[BillL]

Ed, I am not sure about the EMI there, but the RG400 and BNC are pretty tight to keep the RF inside.

I would, however, suggest nut plates for your GPS antenna screws, eliminate the angle of that plate sitting on the bucked rivets and make a joggle so it does not deform the skin. Think about future removal - it should all be able to replaced with one person on the outside of the airplane. The backer plate could be attached with pro-seal to avoid a need for rivets.