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06-04-2019, 07:11 AM
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Join Date: Feb 2014
Location: Granbury, Tx
Posts: 30
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G3x GPS antennas
Good morning,
I'm presently wiring my 2 screen G3x touch. I have a GTN 650 that will drive the system. According to the Garmin install manual it appears that I will need 2 GPS antennas. One to drive the 650 and one for the PFD. Am I looking at this correctly?
Thanks in advance!
SteveL
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06-04-2019, 07:15 AM
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Join Date: Mar 2016
Location: Northern VA
Posts: 267
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Nope, that sounds correct. G3X needs it own GPS antenna for it's internal calculations, moving maps, etc. GTN need the same.
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Brian Lester
Dues Paid - 2020
RV10 Slow Build - #41778
Finish Kit - in progress
RV10builder.com
KVKX / KHEF
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06-04-2019, 07:32 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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I recommend an antenna for each screen, the GA26 is pretty inexpensive and sits on top of the glare shield unobtrusively.
If you have a G5 add another one for that.
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Walt Aronow, DFW, TX (52F)
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, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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06-04-2019, 07:41 AM
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Join Date: May 2005
Location: Savannah, GA
Posts: 1,301
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Quote:
Originally Posted by Walt
I recommend an antenna for each screen, the GA26 is pretty inexpensive and sits on top of the glare shield unobtrusively.
If you have a G5 add another one for that.
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The G5 has its own antenna built into the bezel, so you don't need an external antenna. For certified aircraft, yes, for experimental, no.
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RV-9A at KSAV (Savannah, GA; dual G3X Touch with autopilot, GTN650, GTX330ES, GDL52 ADSB-In)
Previously RV-4, RV-8, RV-8A, AirCam, Cessna 175
ATP CFII PhD, so I have no excuses when I screw up
2020 dues slightly overpaid
Retired - "They used to pay me to be good, now I'm good for nothing."
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06-04-2019, 08:24 AM
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Join Date: Sep 2010
Location: Olathe, KS
Posts: 2,885
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Quote:
Originally Posted by Ed_Wischmeyer
The G5 has its own antenna built into the bezel, so you don't need an external antenna. For certified aircraft, yes, for experimental, no.
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Hello Ed,
This isn't entirely true.
All aircraft will want to verify their G5 is receiving a good GPS signal, and it is easy to do. See this posting.
While we are discussing G5, it is a good time to remind everyone to make sure their software is up-to-date. The current version is V6.10.
G3X and G3X Touch systems with a G5 will automatically keep the G5 updated as new system software is loaded, but for standalone G5 installations, the user will need to download and install the software.
Thanks,
Steve
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Garmin G3X Support
g3xpert@garmin.com
1-866-854-8433 - 7 to 7 Central Time M to F
Please email us for support instead of using Private Messaging due to the limitations of the latter.
Last edited by g3xpert : 06-04-2019 at 08:30 AM.
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06-04-2019, 09:31 AM
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Join Date: Sep 2013
Location: Rancho San Lorenzo
Posts: 885
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Quote:
Originally Posted by Ed_Wischmeyer
The G5 has its own antenna built into the bezel, so you don't need an external antenna. For certified aircraft, yes, for experimental, no.
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Ed. You are right. But that used to be the case. Starting with V16 of the type certificated G5 STC manual external GPS antennas are not allowed for the G5 (i.e. no GA35/56 etc.). Only the cheaper GPS glareshield versions are approved, like the one Walt alluded to. Also in this same revision standard MIL spec twisted pair wire cannot be used for the CAN bus. There is some specialty signal wire to be used with the addition of resistors and diodes inline.
That's not an April Fool's joke. It's already June. Aren't we glad we don't have to follow the STC install manual on experimental aircraft? Naturally I am in the midst of a Comanche install that is wired with the obsolete stuff. Thank goodness I haven't installed the GA35 GPS antenna on top of the fuselage yet.
Steve. You may want to update your linked post above to reflect the fact type-certified aicraft can no longer use an external GPS antenna for the G5.
Jim
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RV-8
(a few more airplanes too)
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06-04-2019, 10:35 AM
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Join Date: Sep 2010
Location: Olathe, KS
Posts: 2,885
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Quote:
Originally Posted by jliltd
Steve. You may want to update your linked post above to reflect the fact type-certified aicraft can no longer use an external GPS antenna for the G5.
Jim
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Hello Jim,
The G5 has a built-in internal GPS antenna.
An external antenna is an antenna that is external to the G5 unit and connects to the BNC connector on the back of the unit whether it be mounted on the glare shield or on the exterior of the aircraft.
Certified aircraft are required to use an external GPS antenna, not the internal GPS antenna.
Thanks,
Steve
__________________
Garmin G3X Support
g3xpert@garmin.com
1-866-854-8433 - 7 to 7 Central Time M to F
Please email us for support instead of using Private Messaging due to the limitations of the latter.
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06-04-2019, 09:13 PM
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Join Date: Sep 2013
Location: Rancho San Lorenzo
Posts: 885
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Aha. The devil is in the details. Symantics. The only time external would be one in the same would be when installing a G5 in an open cockpit biplane. 😉. Thanks for the clarification. Duh.
Jim
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RV-8
(a few more airplanes too)
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