Mag & RF
I had a similar problem in our Europa.
First, try it outside to make sure its not a problem of RF bouncing around the hangar.
I checked out my comm antenna. Be sure the standing wave ratio SWR is low, say less than 1.5:1. I contacted the local ham radio club and found a guy with an antenna analyzer. We checked my antenna and ended up making a balun for it. Similar in design to the one shown on Aeroelectric. I can give more detail if you need them.
I ran shielded cable to the magnetometer. Grounded the shield at the DU only. I wrapped the magnetometer in aluminum foil and connected the shield wire to the aluminum foil. I also found a DB9 filter helped.
If you need more info contact me off list, or contact Carlos at GRT - he's very familar with what I did.
Jim Butcher
Europa N241BW
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