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  #11  
Old 10-17-2015, 06:41 PM
aerhed aerhed is offline
 
Join Date: Dec 2008
Location: Big Sandy, WY
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If you're installing an overhead console they work well in there. I've put 4 different gps antennas in two overheads and they all worked great.
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  #12  
Old 10-17-2015, 09:10 PM
togaflyer togaflyer is offline
 
Join Date: Apr 2013
Location: Southeast
Posts: 663
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I m not installing an overhead console so center cabin wont work for me. I did read how Vans is now installing one in the cowling, but I do understand the heat issues, which was my concern.
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  #13  
Old 10-17-2015, 09:30 PM
BobTurner BobTurner is offline
 
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Location: Livermore, CA
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Mine is just behind the baggage bulkhead, mounted on top of the empenage, with a doubler. Works great.
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  #14  
Old 10-17-2015, 10:37 PM
ernestn ernestn is offline
 
Join Date: Feb 2012
Location: Bowen Island, BC, Canada
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I have an RV-6 with a Dynon Skyview with the GPS antenna mounted under the fiber glass cowl using a bracket attached to the upper part of the engine mount and also have a Garmin Aera 560 with the antenna mounted on top of the glare shield. Have not had any problems with either location. Aircraft is VFR only.
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  #15  
Old 10-18-2015, 01:17 AM
bob888 bob888 is offline
 
Join Date: Jul 2012
Location: Fresno, CA
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What about ground plane when mounting on cabin cover?
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  #16  
Old 10-18-2015, 06:48 AM
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Auburntsts Auburntsts is offline
 
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Location: Tampa, FL
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Quote:
Originally Posted by bob888 View Post
What about ground plane when mounting on cabin cover?
I did not install a ground plane but was prepared to, per the 650 install manual, if any antenna related issues materialized. To this point performance has been within the manual's listed specs. YMMV. ..
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  #17  
Old 10-29-2015, 09:06 AM
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Bluelabel Bluelabel is offline
 
Join Date: Aug 2013
Location: San Diego, Ca
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Quote:
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What about ground plane when mounting on cabin cover?
Did mine on the cabin top. Put in an aluminum plate under the ant and then ran a wire back to the metal airframe. Easy
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  #18  
Old 10-29-2015, 09:59 AM
Evolution10 Evolution10 is offline
 
Join Date: Jun 2014
Location: oregon
Posts: 94
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For the ground plane on composites (Lancair Evolutions) we use the Electrodag products (specialty conductive coatings - basically copper paint). Where possible we paint the inside (overheads), sometimes the outside (wing tips to help with static relief). With thus in mind, I used this product for my RV-10 (taped off and painted the cabin inside where the overhead goes), all equipment works perfect!. Be very careful to space the antennas according to the manufactures specs as best you can.
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  #19  
Old 10-29-2015, 10:51 AM
Dorfie Dorfie is offline
 
Join Date: Aug 2009
Location: Lexington, KY
Posts: 454
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Quote:
Originally Posted by aerhed View Post
If you're installing an overhead console they work well in there. I've put 4 different gps antennas in two overheads and they all worked great.
Any pictures?
Curious to know how you mounted them and how you accommodated the bottom connectors.
Thanks.
Johan
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  #20  
Old 10-29-2015, 03:06 PM
Canadian_JOY Canadian_JOY is offline
 
Join Date: Aug 2007
Location: Ontario, Canada
Posts: 2,291
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From a general RF engineering perspective the under-cowl mount has two strikes against it.
Since all of these GPS antennas have amplifiers built into them, we need to consider the following:

1) electronic component reliability is an inverse function of temperature. Heat is not your friend in this case.

2) amplifier noise figure is a direct function of temperature. Amplifier noise is not good, so we want to keep the amp as cool as possible in order to keep it as quiet as possible (thus allowing our receivers to better pick out that minuscule GPS signal).

I know of at least one GPS antenna which became "flaky" while under the cowl. They're really not made for that environment. Sure, some will work well and will survive there - we've seen plenty of anecdotal evidence here to support that conclusion. But others will fail prematurely. Besides the obvious cost of a replacement antenna, I suspect most of us would not want to lose GPS functionality while in flight.
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