Seat Belt cable magnetism with ADAHRS...need a fix.

[hesty]

I'm wondering if anyone knows if there is a process to reduce the magnetism of the seat belt cables? I am having a bit of interference with my Dynon D6 and a much less extent, my Skyview. I have mounted the ADAHRS and D6 compass on a cross bar aft of the baggage compartment. The seat belt cables pass about 5 inches from them. I am getting some heading swing if I move the cables around. I am in the build stage of my 7A still, so I am looking for an easy solution if there is one. I have wrapped the cables in two layers of plastic shield, but no help.

Thanks for any ideas.

Chad

[SmilingJack]

Yeah ahve to find a NDT shop and have the person run them through their degauss machine.

I did that with my RV-8 rollbar and it worked great!

[Carl Froehlich]

Wrapping in plastic is a waste of time.

If you can find an old bulk magnetic tape eraser you can degaus the cables. These are typically 6" in diameter and 4" tall, and plug into the wall. I used one of these to degaus the roll bar in an RV-8A.

The other option is to find a real SS cables and replace what you have.

Carl

[dynonsupport]

An option is to constrain the cables so they can't move around the area of the AHRS. I've seen people use Nylon cable clamps and clamp the cable to the cross bar. We can calibrate out a fixed error, so as long as the cable doesn't move it will be fine.

[DennisRhodes]

The NDT shops also have a 120V hand held degaussing coil that will demag that cable. I had one at one time and loaned it to an A&P who said it worked perfectly to demag an engine mount that was effecting the onboard compass. If you can locate one you can do it yourself in about 3 minutes. They also have a small meter that will tell you if the magnetism is still there.

[dlloyd3]

Had the same problem. On the passenger side a loose or tight belt would cause 10 degrees or so change. As Dynonsupport said, clamping the cable tight at the baggage bulkhead allowed a good calibration and fixed the problem.

[togaflyer]

Found this out on a goggle search. Get a pistol grip type solder gun, the type that has the wires that extend out and loops at the end. Run the cable through the loop of the two elements. It will demagnetize it. I have done this with drill bits and screwdrivers and it works. Slowly run it through a couple times and done.

[wm708]

togaflyer
you beat me to that but you need it to plug in and turn on
Bill J

[6 Gun]

Mount a shelf on one side of the floor under where it located now and move it there.
Bob

[hesty]

Thanks for all the input! These are some great ideas.
Cheers
Chad