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-   -   Distance between Dynon and Garmin GPS Antenna/Pucks (https://vansairforce.net/community/showthread.php?t=166151)

sjhurlbut 11-20-2018 08:12 AM

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

Dan B 11-20-2018 08:32 AM

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)."

9GT 11-20-2018 10:00 AM

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.

MConner 12-01-2018 08:50 PM

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

Dan Langhout 12-02-2018 07:17 AM

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.


Walt 12-02-2018 07:30 AM

Quote:

Originally Posted by MConner (Post 1306284)
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.

Piper J3 12-02-2018 08:03 AM

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.


az_gila 12-02-2018 08:23 AM

Quote:

Originally Posted by Walt (Post 1306326)
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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