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  #11  
Old 11-20-2018, 08:12 AM
sjhurlbut sjhurlbut is offline
 
Join Date: Jan 2005
Posts: 834
Default Fine

They?re find under cowl. You?ll still have way more satellites than required. I?ve put them all over the airplane and never had any issues. Usually tracking the max 24 satellites even partially buried. I?ve also had antennas next to each other without affect
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  #12  
Old 11-20-2018, 08:32 AM
Dan B Dan B is offline
 
Join Date: Mar 2006
Location: Edmond, OK
Posts: 194
Default Garmin multiple GPS antenna install min distance

From the Garmin install manual for IFR installations:

"no closer than 12 inches (center to center, 9 inches minimum) from other antennas, including passive antennas such as another GPS antenna or XM antenna. This will minimize the effects of shadowing at 5° elevation angles."

"4. To maintain a constant gain pattern and limit degradation by the windscreen, avoid mounting the antenna closer than 3 inches from the windscreen.
5. For multiple GPS installations, the antennas should not be mounted in a straight line from the front to the rear of the fuselage. Also varying the mounting location will help minimize any aircraft shading by the wings or tail section (in a particular azimuth, when one antenna is blocked the other antenna may have a clear view)."
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Last edited by Dan B : 11-20-2018 at 08:36 AM. Reason: Additional information
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  #13  
Old 11-20-2018, 10:00 AM
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9GT 9GT is offline
 
Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,966
Default

I had absolutely wonderful satellite reception with my Garmin G3X antennas mounted on a shelf under the cowling on my RV-10 with the GTN-650 GPS antenna mounted on the cabin cover. I will be putting the G3X antennas again under the cowling of my -9A along with the GTN-650 GPS antenna under there. 6'-6" is the minimum GPS antenna cable length for the 650.
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Howell, MI
RV-10: #41686 Under Construction
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  #14  
Old 12-01-2018, 08:50 PM
MConner MConner is offline
 
Join Date: Mar 2018
Location: Snead Island, Florida
Posts: 205
Default

My G3x and 650 antennas almost touch each other and work just fine. No feedback on Dynon but I don?t think these passive antennas are very sensitive to other passive antennas. YMMV
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  #15  
Old 12-02-2018, 07:17 AM
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Dan Langhout Dan Langhout is offline
 
Join Date: Mar 2008
Location: Huntsville, AL USA
Posts: 546
Default Inside Right Wingtip

Dynon GPS-2020 and Garmin GA-57X. The top edge of each antenna just barely clears the inside top of the wingtip. No issues with either one.

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  #16  
Old 12-02-2018, 07:30 AM
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Walt Walt is offline
 
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Location: Dallas/Ft Worth, TX
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Quote:
Originally Posted by MConner View Post
My G3x and 650 antennas almost touch each other and work just fine. No feedback on Dynon but I don?t think these passive antennas are very sensitive to other passive antennas. YMMV
Actually GPS antennas are not passive, they have amplifiers and associated electronics in them. Many instances of the old GA35 antennas going bad and taking out nearby GPS's. Mount them next to each other at your own risk, I will never mount an IFR antenna next to another GPS antenna.
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  #17  
Old 12-02-2018, 08:03 AM
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Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,065
Default

I have a Garmin 296 GPS antenna and uAvionix SkyFYX-EXT ADS-B antenna mounted side-by-side on a shelf under the fiberglass cowling on my RV-12. No problems ? excellent GPS reception and dozens of good PAPR reports.

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Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622

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  #18  
Old 12-02-2018, 08:23 AM
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az_gila az_gila is offline
 
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Location: 57AZ - NW Tucson area
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Exclamation

Quote:
Originally Posted by Walt View Post
Actually GPS antennas are not passive, they have amplifiers and associated electronics in them. Many instances of the old GA35 antennas going bad and taking out nearby GPS's. Mount them next to each other at your own risk, I will never mount an IFR antenna next to another GPS antenna.
Note that the Dynon GPS antenna doesn't even have a co-ax cable going to it. All of the processing electronics are within the antenna and it has a digital output.
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