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Will other wiring interfere with Magnetometer?

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Allen Fulmer

Joined: 10 Jan 2006
Posts: 79
Location: Alexander City, AL

Posted: Mon Jan 05, 2009 4:15 pm Post subject: Will other wiring interfere with Magnetometer?

Rather than hijack the thread on interference with Bob Archer VOR antennas I

thought I would start a new thread on Magnetometer interference:



My magnetometers will be on the end ribs of my RV7.



GRT Magnetometer installation instructions read:

-----------------------------------------------

"The most important consideration when mounting the magnetometer is that of

choosing a location in the airplane that is away from magnetic disturbances.

It is quite amazing how sensitive the magnetometer is to these disturbances,

and how much error this can cause in the magnetic heading reported by the

AHRS."

and then:

"... be sure to keep the magnetometer at least 12 inches away from any

current carrying wires (such as navigation or landing light wires), and more

than 18 inches away from ferrous metal, such as the steel mass balance tube

that is typically used in the leading edge of ailerons."

-----------------------------------------------



On my RV7, I only put two conduits in the wings as I was building:  one near

the trailing edge that runs parallel (and within 12 inches) to the aileron

"steel mass balance tube" and the other just behind the spar.  This forward

run was originally going to carry all the wires to strobes, nav. lights,

landing lights, and coax to Bob Archer VOR antenna.



I guess I could run all the electrical stuff in the rear conduit and the

magnetometer wires in the forward one.



Opinion Bob?  Other's experience?



Thanks,



Allen Fulmer

RV7 wiring

Alexander City, AL

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_________________
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N808AF reserved
Alexander City, AL

Bob McC

Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON

Posted: Mon Jan 05, 2009 9:41 pm Post subject: Will other wiring interfere with Magnetometer?

Allen;



The instructions you cite seem to be referring to the location of the

magnetometer itself NOT the routing of its connecting wires. The

instructions say "when mounting the magnetometer - - etc choose a location

away from magnetic disturbances" They make no mention of any precautions to

be taken in routing or location of the connecting wires which is what you'd

be running through your conduit.

No personal experience one way or the other, just my interpretation of the

quotes you've submitted.



Bob McC



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Falco #908
(just starting)

Allen Fulmer

Joined: 10 Jan 2006
Posts: 79
Location: Alexander City, AL

Posted: Tue Jan 06, 2009 5:51 am Post subject: Will other wiring interfere with Magnetometer?

Okay, so it would be okay to run all the wires and cables thorough the same

conduit but the current carrying ones "(such as navigation or landing light

wires)" would still need to pass at least 12" from the magnetometer.



With the magnetometer 18" forward of the rear spar (and thus the aileron

steel mass balance tube) the wires for Nav and strobes will have to be

routed 12" forward of that on their way to forward end of wingtip.  That

should be consistent with Bob Archer's antenna design.



Thanks,



Allen Fulmer



[quote]>>--

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
RV7 QB Fuselage
Eggenfellner H6 on orde
N808AF reserved
Alexander City, AL

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