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Distance between Dynon and Garmin GPS Antenna/Pucks
I searched and couldn't find an answer on the distance between my two GPS Antennas, one being the Dynon SV-GPS-2020 and the other being the Garmin GA35. I know that per the manuals the Dynon needs to be 36? from any transmitting (COM) Antenna and the GA35 needs to be 24?. What I can?t figure out is what should be the minimum spacing between the Dynon and Garmin GPS pucks be.
Thanks in advanced, Lynn |
The install manual for the GDL-82 WAAS antenna says 9" is the minimum to any other passive (GPS or XM) antenna.
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Ok, my current plan has them about 12" apart so sounds like it will work.
Thanks, Lynn |
why the distance?
I planned on side by side in the engine compartment with a mount on firewall will that work?
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I should be able to get the oil filter off with the GPS as they are. If I need a little more room, the GPS rack comes off with the removal of the 4 screws. ![]() ![]() http://www.kitlog.com/photos/project...2017A00018.jpg |
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Personally, I wouldn't put them here. The distance between them may be fine but the airplane itself will shadow any signal coming from the rear. In other words, a satellite signal from the back will be invisible. For travel on the ground all we need are a few satellites in view to get a good 2D location fix. In the air we want as many satellites in view as possible in order to get a 3D location. And the further apart those satellites are from each other the better the 3D fix. That means satellites overhead along with satellites at low angles (closer to the horizon) together give us the best position in 3 dimensional space. In this location any satellites behind the aircraft are useless. ... This is essentially why in an aircraft we use external GPS antennas at all. In your car we don't care. Any position fix is typically good enough. Not so in an airplane. I would recommend moving them - particularly if you intend to do GPS LPV approaches. |
I have three Garmin gps antennas under my engine cowling. Two non-WAAS antennas (for my 430 non-WAAS unit?s) and one WAAS antenna for my 335 ads-b unit. The distance between all three units is about 16 inches. The non-WAAS antennas have been positioned there for about eight years and the WAAS antenna for two years. Have not had any trouble at all with the antennas (knot on wood). Just remember while separation distance is somewhat flexible the minimum length of your WAAS antenna wire is not. Unfortunately, I do not remember that minimum length you need to have but you can call Steinair to confirm it. Just loop the wire under your panel.
Good luck. |
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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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)." |
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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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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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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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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