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07-29-2009, 07:47 AM
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Join Date: Feb 2005
Location: Fort Collins, CO
Posts: 133
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GPS signal and metallic paint
For those of you that have mounted your GPS antenna under the cowl or under a fiberglass access panel, have you found that metallic paint on these surfaces degrades the signal?
I have two GPS antennas and a weather receiver under a fiberglass access panel on the front deck. These antennas have functioned perfectly in this location. However, my plane is now in the paint shop and I am wondering if the JetGlo metallic paint that will be used will affect performance of these antennas.
Thanks,
Jason
__________________
Jason Rouault
RV-7A TMX IO-360 3-Blade MT CS Prop, Flying
Fort Collins, CO
http://www.rouault.us
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07-29-2009, 08:21 AM
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Join Date: Dec 2005
Location: Middle Georgia
Posts: 654
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Hi Jason,
I recently researched this on VAF and the conclusion I seem to remember is that it is not a problem. I think the search terms I used were "GPS antenna cowl" or something like that. From what I remember, either there is not enough metal in the paint or what they are using is not really metal. I am putting my antennas under the cowl as well.
I hope this helps.
__________________
Tony
RV8A
N97AP
Warner Robins, GA
Phase I complete
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07-29-2009, 04:14 PM
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Join Date: Nov 2008
Location: princeton mn.
Posts: 48
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gps signal & metalic paint
I have urathane metalic paint on my cowl, with gps ant. underneath, no problems.
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07-29-2009, 07:31 PM
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Join Date: Nov 2007
Location: Keller, TX
Posts: 151
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Metalics
I don't think any of the current JetGlo products have metal metalic in them. We used to have to be careful lest a metalic stripe on a radome would attenuate the radar, but it isn't an issue any more.
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07-30-2009, 05:31 AM
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Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
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No problem..
...since my buddy has a silver paint on his -4. I've flown it many times and the 496 acquires satellites quickly and wx comes in with no problem either.
Regards,
__________________
Pierre Smith
RV-10, 510 TT
RV6A (Sojourner) 180 HP, Catto 3 Bl (502Hrs), gone...and already missed
Air Tractor AT 502B PT 6-15 Sold
Air Tractor 402 PT-6-20 Sold
EAA Flight Advisor/CFI/Tech Counselor
Louisville, Ga
It's never skill or craftsmanship that completes airplanes, it's the will to do so,
Patrick Kenny, EAA 275132
Dues gladly paid!
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07-30-2009, 11:25 AM
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Join Date: Aug 2007
Location: Shallotte NC
Posts: 594
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Metallics
It is my understanding, after a discussion with a DuPont rep, that modern metallics use a polymer similar to Mylar in there flake metallics. If so, it doubt it would cause an issue with signal transparency. I have my GPS puck on the firewall, so it sees the sky through my cowl. All was perfect until I added some heat reflective sticky back aluminum stuff to the top cowl. On the next flight, my GPS was very quiet!! Felt like an idiot......
Regards,
Chris
__________________
Chris Schmitt
Shallotte, NC
RV9A 90970 N614RV
Sold to nice folks in Texas and badly missed.
RV9 in progress
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08-02-2009, 07:18 PM
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Join Date: Feb 2005
Location: Fort Collins, CO
Posts: 133
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Thanks for the responses. Great to hear it may not be a problem.
__________________
Jason Rouault
RV-7A TMX IO-360 3-Blade MT CS Prop, Flying
Fort Collins, CO
http://www.rouault.us
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