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04-22-2019, 08:46 PM
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Join Date: Feb 2019
Location: Sausalito CA in Northern CA near wine country
Posts: 45
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WAAS and Serious Satellite GPS Antenna Location
What is the consensus on mounting GPS antennas? I am somewhat reluctant to mount these two antennas on the top of the fuselage aft of canopy but I don't want to mess around and mount internally on a ledge under back canopy only to get lousy reception.
Thoughts?
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04-22-2019, 08:50 PM
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Join Date: Jul 2018
Location: CA
Posts: 227
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FWIW I just spoke to a very experienced avionics pro today and he said he is mounting GPS antennas on the dash visor with good effect
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20 dues paid member since 2018
RV6A
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04-23-2019, 08:13 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,145
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Quite a few of us (myself included) have built a small shelf under the FWF engine cowling and installed them there. The fiberglass cowling is transparent to the GPS radio signals as long as you don't use paint with metallic pigments.
I've got two Garmin and one Dynon GPS antennas up there with excellent reception.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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04-23-2019, 08:55 AM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,596
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I ran with a GX-60 GPS antenna and a 396 GPS and XM weather antennas on the glare shield of the RV-8A for years with no issue. I mounted a SkyView GPS receiver and GTN-650 antenna on the glare shield in the RV-10 and it worked. I note the Garmin GPS antennas are more sensitive to mounting than the SkyView, so your mileage may vary depending on what you are installing. For the new RV-8 project the SkyView GPS receiver is going on the glare shield but the GTN-650 antenna is mounted on the fuselage just aft of the rear seat, but still under the canopy.
Carl
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04-23-2019, 10:22 AM
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Join Date: Nov 2008
Location: Baton Rouge, LA
Posts: 671
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My xm and gps antennas are on glare shield. The antennas need to be black or the reflection is a problem. Also, gps antennas located too close to each other will interfere with one another. John
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04-23-2019, 10:50 AM
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Join Date: Mar 2010
Location: KSGJ / TJBQ
Posts: 2,039
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Quote:
Originally Posted by jpowell13
My xm and gps antennas are on glare shield. The antennas need to be black or the reflection is a problem.
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Similar to my setup except mine are under my glareshield with phonelic covered cutouts.
My G430W antenna has been there since 2009 while my Dynon antenna has been there since 2013. I have never had a problem with either of them while both of them show full satellite reception.

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Galin
CP-ASEL-AMEL-IR
FCC Radiotelephone (PG) with Radar Endorsement
2020 Donation made
www.PuertoRicoFlyer.com
Last edited by GalinHdz : 04-25-2019 at 11:22 AM.
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04-23-2019, 12:08 PM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,145
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Quote:
Originally Posted by jpowell13
Also, gps antennas located too close to each other will interfere with one another. John
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Not universally true - I've got almost 400 hours like this with no interference.

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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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04-23-2019, 01:35 PM
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Join Date: Nov 2008
Location: Baton Rouge, LA
Posts: 671
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Interference
In my case, it was my iLevil portable ADSB/GPS receiver that was interfering with the Garmin antenna for my 400W. It was interesting to watch the signal strength bars on the 400W drop as you moved the iLevil closer to the Garmin antenna. John
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04-23-2019, 07:40 PM
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Join Date: Oct 2009
Location: Edson, Alberta, Canada
Posts: 483
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GPS puck location
I have my Dynon under the rear window and on a shelf mounted to the crossbar.
Many before me did this with no problems.
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Dave Cobb
[color="Red"]=VAF=2019 Donation - and a bit extra for great work![/COLOR="blue"]
Empennage RV 7 - Tipper
Wings complete
Dynon installed and running
Fuse closer to completion, Canopy complete
AME reviewed and repaired O-320-Lyc installed
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04-23-2019, 11:13 PM
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Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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Black pucks on the glare shield...works beautifully. I use the "hook" velcro on the pucks which grabs the acrylic carpet on the glare shield like crazy.
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Doug
RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019! 
Tail number N427DK
Donation made for 2020
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
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