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  #11  
Old 07-02-2018, 10:33 PM
tommylewis's Avatar
tommylewis tommylewis is offline
 
Join Date: Jan 2005
Posts: 769
Default My experience

I have a Garmin GPS 18 gps mounted in the left wing tip of our RV7a as gps2 into the GRT EFIS. It works flawlessly. There is no coax to run, just power and a serial line back to the GRT.. simple
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Tom Lewis
RV7a N967BT 1900 hrs.
RV10 N143EB 960 hrs.
Granbury, Tx
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  #12  
Old 07-03-2018, 07:08 AM
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1001001 1001001 is offline
 
Join Date: Dec 2014
Location: Just Minutes from KBVI!
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Are there any particular requirements for GPS receiver/antenna distance from aircraft centerline that are relevant to an installation intended for use as an IFR navigator for enroute and approach guidance?
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  #13  
Old 07-03-2018, 07:28 AM
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Dan Langhout Dan Langhout is offline
 
Join Date: Mar 2008
Location: Huntsville, AL USA
Posts: 546
Default Requirements

Quote:
Originally Posted by 1001001 View Post
Are there any particular requirements for GPS receiver/antenna distance from aircraft centerline that are relevant to an installation intended for use as an IFR navigator for enroute and approach guidance?
When I went through this with my Avidyne IFD440, I couldn't find anything that specifically required center line mounting - just the typical admonitions to make sure it had a clear view with no shadowing, etc. That said, I moved the Garmin GA-57X antenna for my GDU-375 out to the wingtip from its previous location on the top of the aft fuselage to make room for the GA-37 antenna used for the IFD440. For IFR work, I didn't want the approx 12.5 foot offset from center line I would have had with it in the wing. Probably wasn't really an issue but . . . . .
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Dan Langhout
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  #14  
Old 07-03-2018, 04:36 PM
Dan B Dan B is offline
 
Join Date: Mar 2006
Location: Edmond, OK
Posts: 194
Default

Quote:
Originally Posted by 1001001 View Post
Are there any particular requirements for GPS receiver/antenna distance from aircraft centerline that are relevant to an installation intended for use as an IFR navigator for enroute and approach guidance?
Garmin provides GPS and comm antenna installation guidance in their installation manuals.
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Dan Burdette
Skyview, ADS-B, Garmin 420W, TT Gemini AP
RV-9A, IO-320, E-Mag
Guthrie-Edmond Rgnl, OK (KGOK)
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  #15  
Old 07-03-2018, 06:33 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
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Default

Quote:
Originally Posted by Dan Langhout View Post
For IFR work, I didn't want the approx 12.5 foot offset from center line I would have had with it in the wing. Probably wasn't really an issue but . . . . .
I use an Archer antenna in the wingtip for ILS approaches. I just can't fly well enough to notice that I'm 12.5 feet off center due to the antenna.... -

However, for GPS I would follow the manufacturer's instructions. They're usually in the installation manual. Remember these signals are incredibly weak, and the TSO instructions promise you will get the best performance possible under the most trying conditions. Something that few of us are capable of easily testing on our own.
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