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Magnetometer Near Transponder Antenna

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billhuntersemail(at)gmail
Guest

Posted: Wed Mar 08, 2017 11:22 am Post subject: Magnetometer Near Transponder Antenna

Hi cyber Friends!!! 

I am building a composite pusher airplane and due to the rather large size of the Dynon SV ADAHRS it is it difficult to find a suitable installation location.  Dynon sells a remote magnetometer MAG-236 however the box size is the same (both units share the exact same box). The Skyview will not work with another vendors unit because of the proprietary nature of the network. 



In the nose I have a landing light, autopilot servos, and an electric trim motor.  In the tail I have an engine with electronic ignition and strobe power box.The the most convenient location for my SV-ADAHRS-200 is under the back seat and I could install it onto the ground plane of the transponder ... the transponder antenna is mounted onto this aluminum ground plane and then the transponder antenna is stuck straight down through the airplane floorboard so that it sticks out from the belly of the airplane so this ground olane would be a convenient installation rack. Would the transponder antenna cause magnetic interference if mounted in this manner?  The cable to the transponder will of course be shielded. The kids will be seated back there and they will have all of their various digital gear (iPads, etc) fired up and chargers plugged in however I do not know much magnetic interference the iPads and chargers will cause 2 feet away from the unit under their seat.Any suggestions?

THANKS!!! 



Bill Hunter 



On Mar 8, 2017 10:59 AM, "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)> wrote: 	  Quote: 	
		  --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>

 

 There could be a mechanical problem with the engine or starter.  If those have been ruled out, next check for voltage drops in the starter circuit.  It is much easier to find bad connections when the circuit is under heavy load.  Disconnect the starter motor and connect a heavy load in its place.  While current is flowing, measure the voltage between the battery positive post and the positive terminal at the starter end.  And then measure voltage between the battery negative post and starter ground.

 

 --------

 Joe Gores

 

 

 

 

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 http://forums.matronics.com/viewtopic.php?p=467028#467028

 

 

 

 

 

 

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alec(at)alecmyers.com
Guest

Posted: Wed Mar 08, 2017 12:06 pm Post subject: Magnetometer Near Transponder Antenna

It's not just electrical currents you have to watch out for. Any item with an appreciable amount of soft iron content will cause issues. Aside from it's own residual magnetic field the mere presence of a local magnetically permeable object distorts the direction of the very weak Earth's field that your magentometer is trying to sense. 



 Something that might cause an issue, for instance, would be a toolbox put on the back seat.



There will be some kind of self-calibration procedure, but that won't help much if the putative toolbox moves in flight.

On 8Mar2017, at 2:18 PM, William Hunter <billhuntersemail(at)gmail.com> wrote:



Hi cyber Friends!!! 



I am building a composite pusher airplane and due to the rather large size of the Dynon SV ADAHRS it is it difficult to find a suitable installation location.  Dynon sells a remote magnetometer MAG-236 however the box size is the same (both units share the exact same box). The Skyview will not work with another vendors unit because of the proprietary nature of the network. 



In the nose I have a landing light, autopilot servos, and an electric trim motor.  In the tail I have an engine with electronic ignition and strobe power box.



The the most convenient location for my SV-ADAHRS-200 is under the back seat and I could install it onto the ground plane of the transponder ... the transponder antenna is mounted onto this aluminum ground plane and then the transponder antenna is stuck straight down through the airplane floorboard so that it sticks out from the belly of the airplane so this ground olane would be a convenient installation rack. 



Would the transponder antenna cause magnetic interference if mounted in this manner?  The cable to the transponder will of course be shielded. 



The kids will be seated back there and they will have all of their various digital gear (iPads, etc) fired up and chargers plugged in however I do not know much magnetic interference the iPads and chargers will cause 2 feet away from the unit under their seat.



Any suggestions?



THANKS!!! 



Bill Hunter 

On Mar 8, 2017 10:59 AM, "user9253" <fransew(at)gmail.com> wrote:




There could be a mechanical problem with the engine or starter.  If those have been ruled out, next check for voltage drops in the starter circuit.  It is much easier to find bad connections when the circuit is under heavy load.  Disconnect the starter motor and connect a heavy load in its place.  While current is flowing, measure the voltage between the battery positive post and the positive terminal at the starter end.  And then measure voltage between the battery negative post and starter ground.



--------

Joe Gores





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=467028#467028

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Wed Mar 08, 2017 12:41 pm Post subject: Magnetometer Near Transponder Antenna

While it can be challenging to find magnetically quiet areas on certain 

aircraft, the Dynon Skyview ADAHRS is NOT large in size. The units are 

smaller than a pack of cigarettes. Usually the separate magnetometer can 

be located near a wing tip if there isn't a quiet area in the fuselage.

I built a shelf at the top of my fuselage to keep mine away from moving 

cables, flight controls and other electrics.

On 3/8/2017 1:03 PM, Alec Myers wrote:

 	  Quote: 	
		   



 It's not just electrical currents you have to watch out for. Any item with an appreciable amount of soft iron content will cause issues. Aside from it's own residual magnetic field the mere presence of a local magnetically permeable object distorts the direction of the very weak Earth's field that your magentometer is trying to sense.



  Something that might cause an issue, for instance, would be a toolbox put on the back seat.



 There will be some kind of self-calibration procedure, but that won't help much if the putative toolbox moves in flight.

 On 8Mar2017, at 2:18 PM, William Hunter <billhuntersemail(at)gmail.com> wrote:



 Hi cyber Friends!!!



 I am building a composite pusher airplane and due to the rather large size of the Dynon SV ADAHRS it is it difficult to find a suitable installation location.  Dynon sells a remote magnetometer MAG-236 however the box size is the same (both units share the exact same box). The Skyview will not work with another vendors unit because of the proprietary nature of the network.



 In the nose I have a landing light, autopilot servos, and an electric trim motor.  In the tail I have an engine with electronic ignition and strobe power box.



 The the most convenient location for my SV-ADAHRS-200 is under the back seat and I could install it onto the ground plane of the transponder ... the transponder antenna is mounted onto this aluminum ground plane and then the transponder antenna is stuck straight down through the airplane floorboard so that it sticks out from the belly of the airplane so this ground olane would be a convenient installation rack.



 Would the transponder antenna cause magnetic interference if mounted in this manner?  The cable to the transponder will of course be shielded.



 The kids will be seated back there and they will have all of their various digital gear (iPads, etc) fired up and chargers plugged in however I do not know much magnetic interference the iPads and chargers will cause 2 feet away from the unit under their seat.



 Any suggestions?



 THANKS!!!



 Bill Hunter

 On Mar 8, 2017 10:59 AM, "user9253" <fransew(at)gmail.com> wrote:

 



 There could be a mechanical problem with the engine or starter.  If those have been ruled out, next check for voltage drops in the starter circuit.  It is much easier to find bad connections when the circuit is under heavy load.  Disconnect the starter motor and connect a heavy load in its place.  While current is flowing, measure the voltage between the battery positive post and the positive terminal at the starter end.  And then measure voltage between the battery negative post and starter ground.



 --------

 Joe Gores





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=467028#467028

 ====================================

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 Electric-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

billhuntersemail(at)gmail
Guest

Posted: Wed Mar 08, 2017 1:54 pm Post subject: Magnetometer Near Transponder Antenna

Kelly,



Thanks for the information.  Are you running a Skyview?



The Skyview system has a remote mounted ADAHRS-200 box (both attitude and

compass) and also an optional SV-MAG-236 remote mounted magnetic compass for

challenging installations where the location of the ADAHRS is too

magnetically noisy.



Sadly, both boxes listed above use the exact same design case and its

dimensions are 2.60 inches front/back (plus some for the serial connector),

4.71 inches side to side, and 1.22 inches tall.  If they offered a cigarette

box sixed gizmo then I would be super happy however the SV-MAG-236 is all

they have to offer and the space I have out at my strake end is too small.

I really do not want to have to get involved in carving out a chunk of my

wing foam...that would suck.



.



Cheers!!!



Bill  Hunter



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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Wed Mar 08, 2017 4:24 pm Post subject: Magnetometer Near Transponder Antenna

Yes, I have a Skyview system. Yes, the box is a little fatter than 

cigarette pack, but not by much. I have both the ADAHRS-200 and 201 for 

redundancy. I don't know how you would package them much smaller, 

especially the ADAHRS to make the necessary static and pitot connections.



On 3/8/2017 2:52 PM, William Hunter wrote:

[quote] 



 Kelly,



 Thanks for the information.  Are you running a Skyview?



 The Skyview system has a remote mounted ADAHRS-200 box (both attitude and

 compass) and also an optional SV-MAG-236 remote mounted magnetic compass for

 challenging installations where the location of the ADAHRS is too

 magnetically noisy.



 Sadly, both boxes listed above use the exact same design case and its

 dimensions are 2.60 inches front/back (plus some for the serial connector),

 4.71 inches side to side, and 1.22 inches tall.  If they offered a cigarette

 box sixed gizmo then I would be super happy however the SV-MAG-236 is all

 they have to offer and the space I have out at my strake end is too small.

 I really do not want to have to get involved in carving out a chunk of my

 wing foam...that would suck.



 ..



 Cheers!!!



 Bill  Hunter



 --

- The Matronics AeroElectric-List Email Forum -

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:

http://www.matronics.com/Navigator?AeroElectric-List

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

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