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10-30-2018, 04:44 PM
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Join Date: Jan 2005
Location: Ontario, Canada
Posts: 1,544
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I have mounted them forward the firewall, just under the cowling. This has worked well for a number of years on two or three different airplanes. It may not work if you use a metallic paint.
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Tom Martin RV1 pilot 4.6hours!
CPL & IFR rated
EVO F1 Rocket 1000 hours,
2010 SARL Rocket 100 race, average speed of 238.6 knots/274.6mph
RV4, RV7, RV10, two HRIIs and five F1 Rockets
RV14 Tail dragger
Fairlea Field
St.Thomas, Ontario Canada, CYQS
fairleafield@gmail.com
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11-01-2018, 12:11 AM
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Join Date: Jul 2013
Location: US
Posts: 2,245
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FWIW, I have a Garmin antenna feeding a 430W *and* a Dynon SV-GPS-2020 on a shelf mounted on the forward firewall, basically next to each other, and after 600 hours I've had zero issues with either antenna (now that I say that, of course, one or the other or both will go wonky on my next flight ha ha!). Signal strength on both is always great, no dropouts, no problems. Even have an XM antenna that I stuck under the cowling so I could listen to SiriusXM on XCs. Everything is copacetic.
YMMV.
Oh, and I do recall reading something about not painting GPS antennae. I believe it's in the Garmin install manuals.
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2019 Dues paid!
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11-01-2018, 08:28 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,120
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Quote:
Originally Posted by RV7A Flyer
FWIW, I have a Garmin antenna feeding a 430W *and* a Dynon SV-GPS-2020 on a shelf mounted on the forward firewall, basically next to each other, and after 600 hours I've had zero issues with either antenna (now that I say that, of course, one or the other or both will go wonky on my next flight ha ha!). Signal strength on both is always great, no dropouts, no problems. Even have an XM antenna that I stuck under the cowling so I could listen to SiriusXM on XCs. Everything is copacetic.
YMMV.
Oh, and I do recall reading something about not painting GPS antennae. I believe it's in the Garmin install manuals.
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Same here, with the Dynon GPS2020 and Garmin 430W antennae sitting next to each other on a small shelf under the cowling just forward of the firewall, works great.
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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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11-01-2018, 09:24 AM
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Join Date: Feb 2011
Location: Colorado Springs CO
Posts: 30
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Do not paint
Garmin GA 35 and 57X antennas admonish DO NOT PAINT imprinted on on the units.
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11-01-2018, 11:25 AM
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Join Date: Feb 2008
Location: Largo, FL
Posts: 1,027
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Yet....
People put them under painted fiberglass cowls...??
Just thinking there is a disconnect.
R.
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RV-10 Co-built, maintained, flown (sold)
RV-8A Maintained and flown (Sold)
RV-6A Bought and Flying (N177RV), upgrades $$$
IO360, 180HP/CS, AFS 5600T, D10A, G650, G430, G327, ADS-B, VIZ385 AP
Very Happy Contributor
Comm, SMEL, CFII, A&P
Based at KCLW (Clearwater, FL)
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11-01-2018, 11:56 AM
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Join Date: Aug 2007
Location: Ontario, Canada
Posts: 2,280
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The "do not paint" comes from the very real instances of people painting the antennas with paint that is not absolutely RF-transparent. One CAN paint antennas. It is inadvisable unless one is very familiar with the RF transparency characteristics of the paint.
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11-01-2018, 02:41 PM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,120
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And it's fine under the cowling as long as you use non-metallic pigments in the paint.
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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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