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I suspect it is a design and/or magnetometer-quality issue. They have decided to fit everything in a tight space, and with everything else that is going on in there electrically, it must be an impossible balancing act.
I have a Dynon Skyview with a separate ADHRS unit (which contains the magnetometer). This is located remote from the EFIS, but not very far away and is still behind the panel and I have not had any trouble with stable magnetic compass using this installation. Even so, Dynon offers a separate magnetometer for problematic installations. Dynon’s setup also allows for installing a second ADHRS unit for redundancy in a stack, although I have not done this.
I think that uAvionix wanted to make a splash by doing everything in a very small self-contained unit and they have found out by now that stray EM energy is impossible to block within a small distance of a pile of electronics, screens and power supplies. They should have anticipated this in the design phase. Sounds like a marketing-department imposed constraint.
You may be able to mitigate the “precession” by identifying any component that changes its EM emission profile over time. The only one of these I can think of is the flat screen, as it may build up static electricity on it’s surface over time. Maybe finding a way to discharge this, like a small bare ground wire wrapped around the perimeter of the screen? Just thinking out loud here.
From: main@Q-List.groups.io <main@Q-List.groups.io> On Behalf Of hgflier via groups.io
Sent: Friday, December 2, 2022 10:26 AM
Subject: Re: [Q-List] AV30
Isn't the precession problem inherent in any gyro-based compass/DG?
On Saturday, November 26, 2022 at 08:28:09 AM PST, Jim Patillo <logistics_engineering@...> wrote:
Good morning all,