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  #1  
Old 11-13-2018, 02:46 PM
rocketman1988 rocketman1988 is offline
 
Join Date: Jun 2010
Location: Sunman, IN
Posts: 1,203
Default GPS Antenna Inside Overhead Console

Does anyone have any photos of GPS antennas mounted inside the overhead console?

If you have been flying with install, how is the antenna performance?

Deciding on interior or exterior mount for my -10...

Thanks!
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Bob
Aerospace Engineer '88

RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
Doors - Done
On Gear
290 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...

Dues Paid 2018,...Thanks DR+
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  #2  
Old 11-13-2018, 05:38 PM
rvdave rvdave is offline
 
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Posts: 339
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Here are a few of my install in Aerosport overhead using 90 deg fittings , have about 140 hours, get good signal, sometimes get signal in the hangar with door open.







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Cadillac, Mi
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  #3  
Old 11-13-2018, 09:08 PM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
Posts: 1,203
Default Thanks!

Knew there had to be at least 1 out there...

Is it actually mounted to the access panel?
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Bob
Aerospace Engineer '88

RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
Doors - Done
On Gear
290 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...

Dues Paid 2018,...Thanks DR+

Last edited by rocketman1988 : 11-13-2018 at 09:11 PM. Reason: add
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  #4  
Old 11-13-2018, 10:17 PM
rvdave rvdave is offline
 
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Posts: 339
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Yes puck to spacer block, block to access panel. The afs puck is narrower to fit in the rear access but the navigator puck was thicker and had to fit in the forward taller space, all worked out. Coax and wiring run through forward cabin bar.
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Cadillac, Mi
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  #5  
Old 11-14-2018, 09:04 AM
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Walt Walt is offline
 
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Location: Dallas/Ft Worth, TX
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I don't have a dog in this fight but I'm pretty sure most folks don't have the ability to measure/determine antenna performance other than ancedotal evidence "it works ok".

Personally I suggest that antennas be mounted for best performance and not cosmetics, which usually means as close as possible to the install requirements called out in the install manual.
I consider IFR navigator antennas as critical items and treat them as such.
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Walt Aronow, Dallas, TX (52F) RV7A, IO360, C/S, 1500+hrs

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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  #6  
Old 11-14-2018, 09:16 AM
rocketman1988 rocketman1988 is offline
 
Join Date: Jun 2010
Location: Sunman, IN
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Default and...

The Garmin install manual doesn't prohibit antenna installation beneath a composite skin.

I wanted to see if anyone who had done this has had any issues, that's all.

In reality, it is not a big problem because if the antennas do not perform mounted IN the overhead console, they get removed and mounted on the exterior of the cabin top in the same location...no need to change any wiring.

From what Garmin has said, a metallic paint job would pose more of a problem than the fiberglass cabin top. I don't have the equipment to verify it but that is what I was told...

Think I will give it a try as there is nothing to lose if it doesn't work...
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Bob
Aerospace Engineer '88

RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
Doors - Done
On Gear
290 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...

Dues Paid 2018,...Thanks DR+

Last edited by rocketman1988 : 11-14-2018 at 09:18 AM. Reason: content
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  #7  
Old 11-14-2018, 09:46 AM
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Walt Walt is offline
 
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Location: Dallas/Ft Worth, TX
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Default

Just FYI stuff from the GA35 IM...

2.4 Antenna Grounding

The antenna is grounded through the mounting hardware. The mounting hardware (washers and nuts) and doubler plate should make contact with an unpainted surface ensuring proper antenna grounding.

It is very important to have good conductivity between the coaxial shield and the ground plane. This is ensured when all the fasteners properly ground the antenna base to the skin of the aircraft.
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Walt Aronow, Dallas, TX (52F) RV7A, IO360, C/S, 1500+hrs

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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  #8  
Old 11-14-2018, 10:15 AM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
Posts: 1,203
Default and...

"...23.3.5 Antenna Grounding Plane
Although no ground plane is required, the antennas typically perform better when a ground plane is used. The ground plane should be a conductive surface as large as practical, with a minimum diameter of 8 inches. To use an antenna in aircraft with fabric or composite skin, a ground plane is recommended. It is usually installed under the skin of the aircraft, below the antenna, and is made of either aluminum sheet or of wire mesh..."

It is funny reading the install manual, there are places which seem to contradict each other.

I really have to laugh at the GMU position requirements. If you were to follow every recommended distance to determine the best mounting location, it would appear that the magnetometer needs to be flying about 10 feet outside the aircraft but in close formation...

Obviously, that isn't the case but it is funny...

In the antenna example, they talk about grounding the antenna to the ground plane but in another section, it states that the ground plane is not required...

I intend to mount the antenna on an aluminum plate within the overhead console, and ground that plate to the airframe.
__________________
Bob
Aerospace Engineer '88

RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
Doors - Done
On Gear
290 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...

Dues Paid 2018,...Thanks DR+

Last edited by rocketman1988 : 11-14-2018 at 10:19 AM. Reason: content
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  #9  
Old 11-14-2018, 10:17 AM
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Paddy Paddy is offline
 
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Location: Chicago
Posts: 230
Default Antennae

Bob,
I have the GA-35 antenna mounted on the outside of the cabin top between the doors and another 3-antenna GPS array mounted inside the overhead console on the rear aluminum panel. They all work reliably, in fact the 3 inside acquire faster than the one outside, but that is probably due to differences in the software between the G3x and the GTN. I don't have a way to measure signal strength other than to observe that they all acquire a full constellation inside the hangar with the door closed and have been reliable in flight.
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RV-10
Flying as of 10/30/16 after 8 yrs building
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  #10  
Old 11-14-2018, 10:25 AM
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Paddy Paddy is offline
 
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Location: Chicago
Posts: 230
Default Ground Plane

If you ask a truly knowledgeable person at Garmin, they'll tell you that the GA-35 antenna was designed such that the metal baseplate of that particular antenna is sufficient ground plane to be mounted directly to a non-conductive surface such as the cabin top, without further ground plane requirement. This probably isn't the case for some other antennae.
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RV-10
Flying as of 10/30/16 after 8 yrs building

Last edited by Paddy : 11-14-2018 at 10:27 AM.
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