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09-12-2019, 07:32 AM
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Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
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I've got basically the same setup as Bob but I don't have a G5 so I use one GA26 puck on the glareshield for one GDU and the GA57 for the other (I didn't hook up the XM portion as I use FIS-B for Wx).
As far as the Marker beacon, the GTN is a suitable sub so unless you plan on flying a CAT III ILS (joking here for you literal SOBs) I see no benefit even if your audio panel still supports it.
__________________
Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
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09-12-2019, 07:52 AM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,596
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Three, four or five GPS antennas? Really?
I am not an expert on Garmin glass, but for IFR I get by just fine with one SkyView GPS antenna and one GTN-650 GPS antenna. On the RV-10 both were mounted on the glare shield. Considering the temperamental aspects of the GTN-650 I now recommend mounting that GPS antenna on the cabin top. On the RV-8A and RV-8 the SkyView is on the glare shield and the GTN-650 is on the top of the fuselage just behind the passenger?s head.
The rest of the antennas are basic:
- Transponder
- ADS-B
- Two comm
- One wingtip VOR/LOC/GS
On the RV-10 I did add a piece of wire strung out under the engine (inside the cowl) for the audio panel Marker Beacon antenna. It works just fine as it has gone off flying at altitude over major airports. Other than that it has never been used an any real or practice approach. I recommend not having a Marker Beacon receiver.
Carl
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09-12-2019, 08:04 AM
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Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,189
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Yes
Yes Carl, those antennas were what was recommended...
I am also not a Garmin expert so I went with the expert’s recommendations...0
__________________
Bob
Aerospace Engineer '88
RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...
Dues+ Paid 2019,...Thanks DR+
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09-12-2019, 09:05 AM
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Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
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Quote:
Originally Posted by Carl Froehlich
Three, four or five GPS antennas? Really?
I am not an expert on Garmin glass, but for IFR I get by just fine with one SkyView GPS antenna and one GTN-650 GPS antenna. On the RV-10 both were mounted on the glare shield. Considering the temperamental aspects of the GTN-650 I now recommend mounting that GPS antenna on the cabin top. On the RV-8A and RV-8 the SkyView is on the glare shield and the GTN-650 is on the top of the fuselage just behind the passenger?s head.
The rest of the antennas are basic:
- Transponder
- ADS-B
- Two comm
- One wingtip VOR/LOC/GS
On the RV-10 I did add a piece of wire strung out under the engine (inside the cowl) for the audio panel Marker Beacon antenna. It works just fine as it has gone off flying at altitude over major airports. Other than that it has never been used an any real or practice approach. I recommend not having a Marker Beacon receiver.
Carl
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The only IFR part of a GARMIN panel is either a GNS or GTN navigator -- so one antenna there. The other GPS antennas are VFR -- one for each screen as each screen has it's own built-in VFR GPS. So really there's no difference than what you have with your system.
__________________
Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
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09-12-2019, 10:55 AM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,596
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Quote:
Originally Posted by Auburntsts
The only IFR part of a GARMIN panel is either a GNS or GTN navigator -- so one antenna there. The other GPS antennas are VFR -- one for each screen as each screen has it's own built-in VFR GPS. So really there's no difference than what you have with your system.
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So a dual Garmin G3X install needs a GPS antenna for each display? I would not have guessed.
Each SkyView display uses the same GPS antenna via serial ports. The functioning of one display does not affect the other in this aspect.
Carl
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09-12-2019, 11:07 AM
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Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
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Quote:
Originally Posted by Carl Froehlich
So a dual Garmin G3X install needs a GPS antenna for each display? I would not have guessed.
Each SkyView display uses the same GPS antenna via serial ports. The functioning of one display does not affect the other in this aspect.
Carl
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No -- only one GPS antenna is required just like with the Dynon. The display with the antenna will share its GPS data with multiple screens. But as each screen has its own integrated GPS most of us add the extra antenna(s) simply to add system redundancy in case of a screen failure.
__________________
Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
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09-12-2019, 11:15 AM
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Join Date: Feb 2015
Location: Oklahoma City
Posts: 913
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I have Dual G3X, G5 and a GTN 650. I have the GA-35 for the GTN and two GA56's, one for the G3X and one for the G5.
All seem to work great!
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09-12-2019, 11:30 AM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,596
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Quote:
Originally Posted by Auburntsts
No -- only one GPS antenna is required just like with the Dynon. The display with the antenna will share its GPS data with multiple screens. But as each screen has its own integrated GPS most of us add the extra antenna(s) simply to add system redundancy in case of a screen failure.
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Ok - now I get it. The G3X has an internal GPS receive that needs an antenna for each display. The SkyView uses an integrated GPS receiver/antenna so the one unit can independently feed multiple displays.
Carl
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09-12-2019, 12:38 PM
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Join Date: May 2016
Location: St Albert, Alberta, Canada
Posts: 515
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For a system that is as well integrated as Garmin I'm surprised that each unit would require it's own antenna and not simply get the data from the other units on the bus. Two units seems 100% reasonable, the others appear to me to be a bit overkill. I will put the backup 57x in the overhead console with the 35 on top for now and worry about any additional pucks on the glare shield later when I cross that bridge. For now I'm just having to decide on what wires to run up top before everything gets more difficult access.
__________________
______________________
Randy P.
1st time builder
RV10 - QB wings and fuse. Working on cabin top
St. Albert, Alberta, Canada
Reserved:C-GRPY
Last edited by RandyAB : 09-12-2019 at 12:41 PM.
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09-12-2019, 01:02 PM
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Join Date: Jul 2016
Location: Arvada, CO
Posts: 89
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Quote:
Originally Posted by RandyAB
For a system that is as well integrated as Garmin I'm surprised that each unit would require it's own antenna and not simply get the data from the other units on the bus.
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From the G3X installation manual:
Unless a GPS 20A is used for GPS position, a minimum of one GPS antenna is required
for installations using more than one GDU 4XX unit, as the GDU 4XX will ?share? the
GPS information with all GDU 46X units. Additional GPS antennas may be used for
redundancy, but are not required.
__________________
Tim
Arvada, CO
RV-10 In Progress
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